Technical Field
[0001] The present invention relates to a low-speed high-torque hydraulic motor in the field
of hydraulic motors, in particular to an internally curved low-speed high-torque hydraulic
motor with torque being output by means of the rotation of a housing.
Background Art
[0002] With the fierce competition in the engineering vehicle market, how to reduce costs,
improve vehicle performance and occupy the market is crucial. At present, the wheel
drive hydraulic motor used in the engineering vehicle has two structures: one structure
is a planetary reduction gearbox with a plunger hydraulic motor for driving the rotation
of a housing; and the other is an internally curved hydraulic motor with a rotatable
cylinder body (spindle) and a fixed motor housing. The first structure is not conducive
to market competition due to its complicated structure, low efficiency, low speed
crawling, and high failure rate; the second structure is an internally curved hydraulic
motor with a rotatable cylinder body (spindle) and a fixed motor housing, thereby
occupying a large space and having limited application in engineering vehicles. Therefore,
how to increase the efficiency, decrease the failure rate, reduce the occupancy space
and make the layout of the main machine more reasonable by improving the structure
on the basis of ensuring the driving performance of the vehicle is a very meaningful
subject in the art.
[0003] In the industries of ships, lifting equipment, and the like, a Viking motor is commonly
used. The Viking motor also has the structure of a rotatable housing, but it has a
different oil distribution mode in comparison with the internally curved motor with
a rotatable housing. The Viking motor uses a radial oil distribution mode. During
use, the oil distribution shaft seal ring or clearance seal may be worn out, thus
causing failure of compensation after the clearance is large, and causing internal
leakage and failure of normal operation. In the case of the same displacement and
torque, the rated speed is low, and the internally curved hydraulic motor with a rotatable
housing can be widely used in industries such as travelling construction machinery,
ships, lifting equipment, etc.
Summary of the Invention
[0004] The main object of the present invention is to overcome the defects of the existing
planetary reduction gearbox with a plunger hydraulic motor for driving the rotation
of a housing, such as low efficiency, low-speed crawling, heavy weight, large size,
and the like, and to overcome the defects of the internally curved hydraulic motor
with a rotatable cylinder body spindle for outputting and a fixed housing, such as
occupying a large space and having limited application. The present invention provides
a novel structure of an internally curved low-speed high-torque hydraulic motor with
torque being output by means of the rotation of a housing. The technical problem to
be solved is to improve the structure so as to easily implement the technical performance
required for the wheel driving of the engineering vehicle, thereby reducing defects
and deficiencies caused by the structure of the wheel-driving traveling hydraulic
motor in the existing engineering vehicle, which is quite suitable for practical use.
[0005] The following technical solutions are used for achieving the object of the present
invention and solving the technical problem thereof. An internally curved low-speed
high-torque hydraulic motor with torque being output by means of the rotation of a
housing is provided according to the present invention, composed of a left bearing
block, a right end cover, a spacer ring, a cylinder body, an internally curved cam
ring, an axial oil distribution pan and a plurality of radially arranged plunger assemblies,
wherein the internally curved cam ring, the left bearing block, the spacer ring and
the right end cover form a motor housing; the motor housing with a split structure
is formed by connecting the internally curved cam ring, the left bearing block, the
spacer ring and the right end cover in series via high-strength bolts; the motor as
a whole is combined by the fixed cylinder body and the rotatable motor housing; the
motor housing rotates around the cylinder body, while the cylinder body is fixed;
the axial oil distribution pan is axially arranged on one side of the cylinder body,
and connected to an oil passage of the cylinder body through an oil passage. Plunger
holes of the cylinder body are arranged in a single row or a plurality of rows depending
on the magnitude of output torque, and the plurality of plunger assemblies are uniformly
arranged in the plunger holes in a radial direction around the cylinder body.
[0006] The plurality of plunger assemblies are uniformly arranged in a radial direction
around the cylinder body.
[0007] An internally curved low-speed high-torque hydraulic motor with output by means of
the rotation of a housing is described above, wherein the axial oil distribution pan
is provided therein with a spring and a balancing plunger, the balancing plunger is
cup-shaped, the spring is against a cup bottom of the balancing plunger, and an outer
surface of the cup bottom of the balancing plunger is in tight fit with the right
end cover; under the action of acting forces and reacting forces, acting forces of
the spring and the balancing plunger cause contact surfaces between the axial oil
distribution pan and the cylinder body to be in close contact; when pressurized oil
enters, the axial oil distribution pan relies on the acting forces of the spring and
the balancing plunger together with the action of the pressurized oil to cause the
contact surfaces between the axial oil distribution pan and the cylinder body to be
always in tight fit; in the case of wear, the acting forces of the spring and the
balancing plunger can be used to cause the contact surfaces between the axial oil
distribution pan and the cylinder body to maintain close contact, thereby compensating
for the wear, compensating for the wear of the axial oil distribution pan, reducing
internal leakage of the motor and prolonging the service life of the motor.
[0008] Compared with the prior art, the present invention has obvious advantages and beneficial
effects. The present invention has at least the following advantages:
- 1. An internally curved low-speed high-torque hydraulic motor with torque being output
by means of the rotation of a housing according to the present invention, due to the
use of the structure of a rotatable housing, provides an effective approach to the
application of the internally curved hydraulic motor to the engineering vehicle. Furthermore,
the present invention also provides a new solution for the wheel driving mode of the
engineering vehicle.
- 2. An internally curved low-speed high-torque hydraulic motor with torque being output
by means of the rotation of a housing according to the present invention, due to the
use of the structure of a rotatable housing, has the advantages of simpler structure,
higher efficiency, higher stability at low speed, lighter weight, smaller size, easier
manufacturing process, and lower failure rate than the planetary reduction gearbox
of plunger hydraulic motor driving; and it has the advantages of smaller occupancy
space, more beneficial layout of the main machine, and the like compared with the
internally curved travelling hydraulic motor with a rotatable cylinder body and a
fixed housing.
- 3. An internally curved low-speed high-torque hydraulic motor with torque being output
by means of the rotation of a housing according to the present invention mainly differs
from the Viking motor in the oil distribution mode. The Viking motor uses a radial
oil distribution mode, but the disadvantage is that the oil distribution shaft seal
ring or clearance seal may be worn out after a long time, and internal leakage may
occur, thereby affecting the output torque of the motor and causing failure of normal
use. The oil distribution mode of the present invention is an axial oil distribution
mode, and has the spring, the balancing plunger and oil pressure in the axial oil
distribution pan to compensate wear so that the service life of the motor is long.
[0009] The above description is only an overview of the technical solutions of the present
invention. In order to have a clearer understanding of the technical means of the
present invention, the present invention can be implemented in accordance with the
contents of the description. In order to make the above and other objects, features
and advantages of the present invention more obvious and understandable, preferred
embodiments will be described in detail below with reference to the drawings.
Brief Description of the Drawings
[0010] In the present invention:
Fig. 1 is a structural schematic diagram of an internally curved low-speed high-torque
hydraulic motor with torque being output by means of the rotation of a housing according
to the present invention.
Fig. 2 is a left view of Fig. 1.
In which:
1: left bearing block |
2: internally curved cam ring |
3: spacer ring |
4: cylinder body |
5: plunger assembly |
|
6: axial oil distribution pan |
6-1: spring |
6-2: balancing plunger |
7: right end cover |
|
Fig. 3 is a partial enlarged diagram of Fig. 1.
Detailed Description of Preferred Embodiments
[0011] In order to further illustrate the technical means and effects of the present invention
for achieving the predetermined inventive object, the specific embodiments, structures,
features and effects of an internally curved low-speed high-torque hydraulic motor
with torque being output by means of the rotation of a housing provided according
to the present invention will be described in detail below with reference to the drawings
and preferred embodiments.
[0012] Referring to Figs. 1-3, an internally curved low-speed high-torque hydraulic motor
with torque being output by means of the rotation of a housing according to preferred
embodiments of the present invention is mainly composed of a cylinder body 4, a left
bearing block 1, an internally curved cam ring 2, a spacer ring 3, an axial oil distribution
pan 6, a right end cover 7, and a plurality of radially arranged plunger assemblies
5, wherein the internally curved cam ring 2, the left bearing block 1, the spacer
ring 3 and the right end cover 7 form a motor housing; the motor housing with a split
structure is formed by connecting the internally curved cam ring 2, the left bearing
block 1, the spacer ring 3 and the right end cover 7 in series via high-strength bolts.
The motor as a whole is combined by the fixed cylinder body 4 and the rotatable motor
housing; the motor housing rotates around the cylinder body 4, while the cylinder
body 4 is fixed. Plunger holes of the cylinder body 4 may be designed in a single
row or a plurality of rows depending on the magnitude of output torque, and the plurality
of plunger assemblies 5 are uniformly arranged in the plunger holes in a radial direction
around the cylinder body 4. Referring to Fig. 3, the axial oil distribution pan 6
is axially arranged on one side of the cylinder body 4, and connected to an oil passage
of the cylinder body 4 through an oil passage. The axial oil distribution pan 6 is
provided therein with a spring 6-1 and a balancing plunger 6-2, wherein the balancing
plunger 6-2 is cup-shaped, the spring 6-1 is against a cup bottom of the balancing
plunger 6-2, and an outer surface of the cup bottom of the balancing plunger 6-2 is
in tight fit with the right end cover 7, thus under the action of acting forces and
reacting forces, the spring force of the spring 6-1 can be used to cause the contact
surfaces between the axial oil distribution pan 6 and the cylinder body 4 to be always
in tight fit.
[0013] Referring to Figs. 1-3, both an oil inlet hole and an oil return hole are arranged
on one end of the cylinder body 4; oil enters the axial oil distribution pan 6 from
the center of the cylinder body 4 in the direction shown in the figures, and is distributed
to the working chambers of the plunger assemblies 5 which are radially uniformly arranged
in the cylinder body 4, and pushes the plunger assemblies 5 to move linearly. Under
the action of pressure, the plunger assemblies 5 push the motor housing, which is
composed of the internally curved cam ring 2, the left bearing block 1, the spacer
ring 3 and the right end cover 7, to rotate. Under initial pressure, the axial oil
distribution pan 6 relies on the acting forces of the spring 6-1 and the balancing
plunger 6-2 to cause the contact surfaces between the axial oil distribution pan 6
and the cylinder body 4 to be always in tight fit; when pressurized oil enters, the
axial oil distribution pan 6 relies on the joint action of the spring 6-1, the balancing
plunger 6-2 and the pressurized oil to cause the contact surfaces between the axial
oil distribution pan 6 and the cylinder body 4 to be in tight fit; in the case where
wear occurs on the contact surfaces between the axial oil distribution pan 6 and the
cylinder body 4, the acting forces of the spring 6-1 and the balancing plunger 6-2
are used to cause the axial oil distribution pan 6 and the cylinder body 4 to maintain
close contact, thereby compensating for the wear, compensating for the wear of the
axial oil distribution pan 6, reducing internal leakage of the motor and prolonging
the service life of the motor.
[0014] Only preferred embodiments of the present invention are described above, and the
present invention is not limited thereto in any way. Although the present invention
has been disclosed above in the preferred embodiments, the present invention is not
limited thereto. Any person skilled in the art can make some amendments or modifications
to the technical contents disclosed above to obtain equivalent embodiments without
departing from the technical scope of the present invention. However, any simple amendments,
equivalent changes and modifications made to the above embodiments in accordance with
the technical essence of the present invention shall still fall within the scope of
the technical solutions of the present invention as long as the contents do not depart
from the technical solutions of the present invention.
1. An internally curved low-speed high-torque hydraulic motor with torque being output
by means of the rotation of a housing, comprising: a left bearing block (1), a right
end cover (7), a cylinder body (4), an internally curved cam ring (2), a spacer ring
(3), an axial oil distribution pan (6), and a plurality of radially arranged plunger
assemblies (5), wherein the internally curved cam ring (2), the left bearing block
(1), the spacer ring (3) and the right end cover (7) form a motor housing; the motor
housing with a split structure is formed by connecting the internally curved cam ring
(2), the left bearing block (1), the spacer ring (3) and the right end cover (7) in
series via high-strength bolts; the motor as a whole is combined by the fixed cylinder
body (4) and the rotatable motor housing; the motor housing rotates around the cylinder
body (4), while the cylinder body (4) is fixed; the axial oil distribution pan (6)
is axially arranged on one side of the cylinder body (4), and connected to an oil
passage of the cylinder body (4) through an oil passage; plunger holes of the cylinder
body (4) are designed in a single row or a plurality of rows depending on the magnitude
of output torque, and the plurality of plunger assemblies (5) are uniformly arranged
in the plunger holes in a radial direction around the cylinder body (4).
2. The internally curved low-speed high-torque hydraulic motor with torque being output
by means of the rotation of a housing according to claim 1, wherein the axial oil
distribution pan (6) is provided therein with a spring (6-1) and a balancing plunger
(6-2), the balancing plunger (6-2) is cup-shaped, the spring (6-1) is against a cup
bottom of the balancing plunger (6-2), and an outer surface of the cup bottom of the
balancing plunger (6-2) tightly fits the right end cover (7); under the action of
acting forces and reacting forces, acting forces of the spring (6-1) and the balancing
plunger (6-2) cause contact surfaces between the axial oil distribution pan (6) and
the cylinder body (4) to be always in tight fit; when pressurized oil enters, the
axial oil distribution pan (6) relies on the joint action of the spring (6-1), the
balancing plunger (6-2) and the pressurized oil to cause the contact surfaces between
the axial oil distribution pan (6) and the cylinder body (4) to be always in tight
fit; in the case where wear occurs, the acting forces of the spring (6-1) and the
balancing plunger (6-2) are used to cause the contact surfaces between the axial oil
distribution pan (6) and the cylinder body (4) to maintain close contact, thereby
compensating for the wear, compensating for the wear of the axial oil distribution
pan (6), reducing internal leakage of the motor.