Low-speed low-pressure large-torque axial plunger hydraulic motor

Abstract

The utility model discloses a low speed low pressure big torque axial plunger hydraulic motor belongs to hydraulic motor technical field, including casing, center output power main shaft, driven track swash plate, seven hole power cylinder body turntable, plunger and oil distribution tray, center output power main shaft is installed in the casing, and the center output power main shaft is installed seven hole power cylinder body turntable, and the plunger is installed in seven hole power cylinder body turntable, and the driven track swash plate is installed in the casing, and the plunger top is on the driven track swash plate, and seven hole power cylinder body turntable bottom panel is close to the oil distribution tray, and the first bearing, second bearing, third bearing and fourth bearing are equipped in the casing, and the first bearing and second bearing all are installed on the oil distribution tray, and the third bearing and fourth bearing all are installed on the driven track swash plate. The utility model optimizes mechanical mechanism system, reduces hydraulic energy in the energy loss of transmission process, makes hydraulic motor work steadily under low speed low pressure big torque load, and has improved the energy conversion efficiency of hydraulic motor.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic motor technology, and in particular to a low-speed, low-pressure, high-torque axial piston hydraulic motor. Background Technology

[0002] Hydraulic motors, which convert hydraulic energy into mechanical energy, are widely used in fields such as engineering machinery, recycled plastic machinery, mining machinery, and marine machinery to provide power output for equipment operation. Existing low-speed, high-torque axial piston hydraulic motor technology suffers from problems such as unreasonable structural design, low energy conversion efficiency, and poor operational stability. For example, the connection method between the piston assembly and the swashplate in some hydraulic motors is not scientifically sound, resulting in significant energy loss during transmission. Inappropriate bearing layout makes the hydraulic motor prone to scoring and stalling under high loads, affecting equipment lifespan and the working environment. Therefore, there is an urgent need to design a hydraulic motor with optimized structure and stable performance to meet the growing demands of industrial production. Utility Model Content

[0003] The main purpose of this invention is to provide a low-speed, low-pressure, high-torque axial piston hydraulic motor, which aims to solve the problems of unreasonable structure, low energy conversion efficiency, and poor operation stability of existing hydraulic motors.

[0004] To achieve the above objectives, this utility model proposes a low-speed, low-pressure, high-torque axial piston hydraulic motor, comprising a housing, a central output power spindle, a driven swashplate, a seven-hole power cylinder turntable, a piston, and a distribution plate. The central output power spindle is mounted in the housing, and the seven-hole power cylinder turntable is mounted on the central output power spindle. The piston is mounted in the seven-hole power cylinder turntable. One end of the housing is connected to a slant seat, and one end of the slant seat is connected to a housing seat. The driven swashplate is mounted inside the slant seat, and the top of the piston rests on the driven swashplate. The bottom panel of the seven-hole power cylinder turntable is in close contact with the distribution plate to form an oil inlet / outlet sealing area, which is fitted with a leak-proof seal. The housing contains a first bearing, a second bearing, a third bearing, and a fourth bearing. The first and second bearings are both mounted on the distribution plate, and the third and fourth bearings are both mounted on the driven swashplate.

[0005] Optionally, the seven-hole power cylinder turntable has a plunger cavity, the plunger is installed in the plunger cavity, the plunger is fitted with a rubber seal, and the top of the plunger is provided with a top shoe, which rests on the driven track swashplate and can rotate 360°.

[0006] Optionally, the upper inner cavity of the housing is provided with a disc-shaped inclined block, and the angle between the inclined surface of the disc-shaped inclined block and the central axis of the housing is 15°-30°.

[0007] Optionally, the driven track swashplate is located within the disk swashplate.

[0008] Optionally, the bottom panel of the seven-hole power cylinder turntable is detachable, and the bottom of the seven-hole power cylinder turntable is provided with an adhesive seal.

[0009] Optionally, the top shoe is provided with a split-edge seat, and the split-edge seat is provided with a screw, and the top shoe is connected to the plunger through the split-edge seat.

[0010] Optionally, the oil distribution plate is provided with a first arc-shaped oil inlet and outlet and a second arc-shaped oil inlet and outlet, which are symmetrically arranged.

[0011] Optionally, a first oil zone seal is provided around the first arc-shaped oil inlet / outlet, and a second oil zone seal is provided around the second arc-shaped oil inlet / outlet.

[0012] Optionally, the bottom of the first bearing in the oil distribution plate is provided with a first rubber ring, and the bottom of the second bearing in the oil distribution plate is provided with a second rubber ring.

[0013] Optionally, the first bearing is mounted on the trapezoidal position of the outer diameter of the oil distribution plate, and the second bearing is mounted on the central bore of the oil distribution plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The bottom panel (copper plate) of the seven-hole power cylinder block turntable and the oil distribution plate form an oil inlet and outlet sealing area, and are equipped with anti-leakage rubber seals and embedded anti-leakage rubber seal structures to block the hydraulic oil leakage channel; the plunger is equipped with plunger rubber seals and plunger bottom rubber seals to enhance the sealing performance between the plunger and the plunger cavity; the first and second arc-shaped oil inlet and outlet ports of the oil distribution plate are respectively equipped with first and second oil area rubber seals, and the bottom of the first and second bearings are equipped with first and second rubber rings. The multiple sealing design comprehensively prevents oil leakage from various key parts.

[0015] 2. The 15°-30° included angle of the disc swashplate inside the housing ensures stable hydraulic oil pressure distribution and provides stable support for the driven track swashplate; the driven track swashplate is fitted with a third and fourth bearing, which greatly improves rotational smoothness; the optimized sliding structure design further improves the power of the hydraulic motor and reduces the energy consumption of the hydraulic motor.

[0016] 3. In response to the problem of damage to the rotating friction surface and machine failure during oil distribution in traditional oil distribution plates, this utility model adds a bearing driven device and a copper plate sealing design to the oil distribution plate surface, and optimizes the pressure distribution with an optimized angle of the inclined block, thereby reducing the frictional resistance of the oil distribution plate by 40% and increasing the energy conversion efficiency by 20%, achieving low-pressure, low-speed, and high-torque working output. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the internal structure of an embodiment of the low-speed, low-pressure, high-torque axial piston hydraulic motor of this utility model. Figure 2 This is a schematic diagram of the driven swashplate. Figure 3 A schematic diagram of the structure of a seven-hole power cylinder turntable; Figure 4 This is a schematic diagram of the oil distribution plate.

[0019] Explanation of icon numbers: The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0022] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0023] This utility model proposes a low-speed, low-pressure, high-torque axial piston hydraulic motor.

[0024] Please see Figures 1-4 In one embodiment of this utility model, the low-speed, low-pressure, high-torque axial piston hydraulic motor includes a housing assembly, a central output power spindle 1, a driven swashplate 6, a seven-hole power cylinder turntable 13, a piston 15, and a distribution plate 18. The housing assembly is formed by connecting a housing 4, a swashplate 3, and a housing seat 2.

[0025] The central output power spindle 1 is mounted in the housing 4. The seven-hole power cylinder turntable 13 is mounted on the central output power spindle 1. The seven-hole power cylinder turntable 13 is connected to the central output power spindle 1 via the central output power spindle key 12. The seven-hole power cylinder turntable 13 and the central output power spindle 1 are equipped with adjusting plates 11 for adjusting the fitting accuracy. The plunger 15 is installed in the seven-hole power cylinder turntable 13. One end of the housing 4 is connected to a slant seat 3, and one end of the slant seat 3 is connected to a housing seat 2. The driven rail slant plate 6 is installed inside the slant seat 3. The top of the plunger 15 rests on the driven rail slant plate 6. The bottom panel of the seven-hole power cylinder turntable 13 is in close contact with the oil distribution plate 18 to form an oil inlet and outlet sealing area. The oil inlet and outlet sealing area is equipped with an anti-leakage sealant to effectively prevent oil leakage. The housing 4 is provided with a first bearing 19, a second bearing 20, a third bearing 7 and a fourth bearing 8. The first bearing 19 and the second bearing 20 are both mounted on the oil distribution plate 18, which serves to support and prevent friction and wear. The third bearing 7 and the fourth bearing 8 are both mounted on the driven track swashplate 6.

[0026] It is understood that the central output power spindle 1 is assembled inside the housing 4, and the seven-hole power cylinder turntable 13 is fixedly mounted on it. A plunger assembly is configured inside the seven-hole power cylinder turntable 13. One end of the housing 4 is mechanically connected to the swashplate 3 and the housing seat 2 via a standard interface. Inside the swashplate 3, the driven swashplate 6 is precisely positioned and installed, and the top of the plunger 15 forms a line contact fit with the working surface of the driven swashplate 6. The bottom panel of the seven-hole power cylinder turntable 13 can be a copper plate 14, which is surface-sealed with the oil distribution plate 18, together forming the oil inlet and outlet sealing area. An embedded anti-leakage seal structure effectively blocks hydraulic oil leakage channels.

[0027] The oil distribution plate 18 adopts a stepped design. The first bearing 19 is mounted on the trapezoidal position of the outer diameter of the oil distribution plate 18, and the second bearing 20 is mounted on the center bore of the oil distribution plate 18. Both the first bearing 19 and the second bearing 20 are one-way thrust ball bearings. Both bearings form the same horizontal plane as the end face of the oil distribution plate 18. Through a pre-tightening assembly process, the oil distribution plate 18 is provided with stable planar driven rotational operation, ensuring its operational stability and sealing reliability under high-pressure conditions.

[0028] In one embodiment of this utility model, a plunger cavity 30 is formed on the seven-hole power cylinder turntable 13, and the plunger 15 is installed in the plunger cavity 30. The plunger 15 is equipped with a plunger seal 16 and a plunger bottom seal 17, which further enhances the sealing performance between the plunger 15 and the plunger cavity 30 and prevents oil leakage during the movement of the plunger 15. The top of the plunger 15 is provided with a top shoe 9, which rests on the driven track swashplate 6 and can rotate 360°, reducing the friction between the plunger 15 and the driven track swashplate 6 and improving the service life of the equipment.

[0029] In this embodiment, seven plunger cavities 30 are evenly distributed on the seven-hole power cylinder turntable 13. Their internal dimensions are precision-machined to form a precise fit with the plungers 15. The plungers 15 are made of high-strength alloy material, processed using a special technique, and installed within the plunger cavities 30, with a wear-resistant coating on their surface. The copper plate 14 has through holes 29 corresponding to each plunger cavity 30.

[0030] The top shoe 9 is made of non-ferrous metal material with a smooth, even surface. Connected to the plunger 15 via a high-precision bearing, the top shoe 9 can firmly press against the driven swashplate 6 and rotate 360° freely. This design significantly reduces the sliding friction between the plunger 15 and the driven swashplate 6, lowering the coefficient of friction to below 30% of conventional structures. This significantly reduces wear during operation and effectively extends the equipment's service life. Laboratory tests show that under rated operating conditions, the equipment can achieve continuous and stable operation for over 8000 hours.

[0031] In one embodiment of this utility model, a disc-shaped inclined block 5 is provided in the upper inner cavity of the housing 4, and the angle between the inclined surface of the disc-shaped inclined block 5 and the central axis of the housing 4 is 15°-30°. The driven track swashplate 6 is located in the disc-shaped inclined block 5, and the third bearing 7 and the fourth bearing 8 are mounted on the driven track swashplate 6, making the rotation of the driven track swashplate 6 more stable and reducing vibration and noise during operation.

[0032] In this embodiment, the disc swash plate 5 is forged from high-strength alloy steel and milled by a precision CNC machining center, achieving a surface roughness of Ra0.8μm. The inclined surface of the disc swash plate 5 forms an angle of 15°-30° with the central axis of the housing 4. This angle has been verified through simulation to ensure power output. The driven track swash plate 6 is precisely installed within the disc swash plate 5. The third bearing 19 and the fourth bearing 20 are respectively fitted onto the key rotating parts of the driven track swash plate 6. The third bearing 19 is a one-way thrust ball bearing, and the fourth bearing 20 is a single-row radial ball bearing. This design ensures excellent stability of the driven track swash plate 6 during high-speed rotation, effectively reducing jamming problems during operation. Furthermore, the optimized lubrication structure design significantly extends the bearing's service life and reduces equipment maintenance costs.

[0033] In one embodiment of this utility model, the bottom panel of the seven-hole power cylinder turntable 13 is detachable, and the bottom of the seven-hole power cylinder turntable 13 is provided with an adhesive seal, which facilitates the maintenance and replacement of the internal parts of the seven-hole power cylinder turntable 13, and at the same time enhances its bottom sealing performance. The top shoe 9 is provided with a split-edge seat 10, and the split-edge seat 10 is provided with screws. The top shoe 9 is connected to the plunger 15 through the split-edge seat 10. This connection method is firm and reliable, and facilitates the installation and replacement of the top shoe 9.

[0034] The oil distribution plate 18 has a first arc-shaped oil inlet / outlet 25 and a second arc-shaped oil inlet / outlet 26. The first arc-shaped oil inlet / outlet 25 and the second arc-shaped oil inlet / outlet 26 are symmetrically arranged to ensure smooth oil flow and improve the working efficiency of the hydraulic motor. The first arc-shaped oil inlet / outlet 25 connects to a first arc-shaped oil zone 27, and the second arc-shaped oil inlet / outlet 26 connects to a second arc-shaped oil zone 28. A first oil zone seal 21 is provided at the first arc-shaped oil inlet / outlet 25, and a second oil zone seal 22 is provided at the second arc-shaped oil inlet / outlet 26, further enhancing the sealing performance of the oil distribution plate 18 and preventing oil leakage. A first rubber ring 23 is provided at the bottom of the first bearing 19, and a second rubber ring 24 is provided at the bottom of the second bearing 20, enhancing the sealing between the bearing and the oil distribution plate 18 and preventing oil leakage from the bearing.

[0035] Working Principle: Oil under a certain pressure enters the oil inlet / outlet sealing area formed by the seven-hole power cylinder turntable 13 and the oil distribution plate 18 through the first arc-shaped inlet / outlet port 25 or the second arc-shaped inlet / outlet port 26 on the oil distribution plate 18. This pushes the plunger 15 to move within the plunger cavity 30. The top shoe 9 of the plunger 15 slides on the driven swashplate 6, driving the seven-hole power cylinder turntable 13 to rotate, which in turn drives the central output power spindle 1 to rotate, realizing the conversion of hydraulic energy into mechanical energy. Throughout the entire working process, the various sealing components effectively prevent oil leakage, the bearings ensure the smooth rotation of the components, and the swashplate 5 provides stable support to the driven swashplate 6, improving the working efficiency and service life of the hydraulic motor. The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A low-speed, low-pressure, high-torque axial piston hydraulic motor, characterized in that, The device includes a housing, a central output power spindle, a driven swashplate, a seven-hole power cylinder turntable, a plunger, and a distribution plate. The central output power spindle is mounted in the housing, and the seven-hole power cylinder turntable is mounted on the central output power spindle. The plunger is installed in the seven-hole power cylinder turntable. One end of the housing is connected to a swashplate, and the other end of the swashplate is connected to a housing seat. The driven swashplate is installed inside the swashplate, and the top of the plunger rests on the driven swashplate. The bottom panel of the seven-hole power cylinder turntable is in close contact with the distribution plate to form an oil inlet / outlet sealing area, which is equipped with a leak-proof seal. The housing contains a first bearing, a second bearing, a third bearing, and a fourth bearing. The first and second bearings are both mounted on the distribution plate, and the third and fourth bearings are both mounted on the driven swashplate.

2. The low-speed, low-pressure, high-torque axial piston hydraulic motor as described in claim 1, characterized in that: The seven-hole power cylinder turntable has a plunger cavity, the plunger is installed in the plunger cavity, the plunger is fitted with a rubber seal, and the top of the plunger is provided with a top shoe, which rests on the driven track swashplate and can rotate 360°.

3. The low-speed, low-pressure, high-torque axial piston hydraulic motor as described in claim 1, characterized in that: The upper inner cavity of the housing is provided with a disc-shaped inclined block, and the angle between the inclined surface of the disc-shaped inclined block and the central axis of the housing is 15°-30°.

4. The low-speed, low-pressure, high-torque axial piston hydraulic motor as described in claim 3, characterized in that: The driven track swashplate is located within the disc swashplate.

5. The low-speed, low-pressure, high-torque axial piston hydraulic motor as described in claim 1, characterized in that: The bottom panel of the seven-hole power cylinder turntable is detachable, and the bottom of the seven-hole power cylinder turntable is sealed with adhesive.

6. The low-speed, low-pressure, high-torque axial piston hydraulic motor as described in claim 2, characterized in that: The top shoe is provided with a split-edge seat, and the split-edge seat is provided with a screw. The top shoe is connected to the plunger through the split-edge seat.

7. The low-speed, low-pressure, high-torque axial piston hydraulic motor as described in claim 1, characterized in that: The oil distribution plate is provided with a first arc-shaped oil inlet and outlet and a second arc-shaped oil inlet and outlet, which are symmetrically arranged.

8. The low-speed, low-pressure, high-torque axial piston hydraulic motor as described in claim 7, characterized in that: The first arc-shaped oil inlet and outlet are surrounded by a first oil zone seal, and the second arc-shaped oil inlet and outlet are surrounded by a second oil zone seal.

9. The low-speed, low-pressure, high-torque axial piston hydraulic motor as described in claim 1, characterized in that: The bottom of the first bearing in the oil distribution plate is provided with a first rubber ring, and the bottom of the second bearing in the oil distribution plate is provided with a second rubber ring.

10. The low-speed, low-pressure, high-torque axial piston hydraulic motor as described in claim 1, characterized in that: The first bearing is mounted on the trapezoidal position of the outer diameter of the oil distribution plate, and the second bearing is mounted on the central bore of the oil distribution plate.

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