CN118167541A - A split guide rail and an inner-curve radial piston motor using the split guide rail - Google Patents

Abstract

The application discloses a split type guide rail, which comprises a stator guide rail and elastic guide rails arranged on two sides of the stator guide rail; wherein, a plurality of continuous curved surfaces are arranged in the stator guide rail; and elastic guide rails are arranged on two sides of the elastic guide rails along the shape of the inner curve curved surface. The application is designed with the structural characteristics that the roller can rotate around the roller axis on the inner curve stator guide rail under the condition that the inner curve motor is started or the lubrication condition of the low-speed large-torque internal components is insufficient, a dynamic pressure oil film is formed on the surfaces of the roller and the inner curve guide rail and the surfaces of the roller and the plunger groove, the working reliability of the inner curve motor under the heavy load working condition is improved, and the elastic guide rail is manufactured by adopting polyurethane rubber materials in the combined guide rail and is in contact connection with the roller and generates tiny deformation so as to increase the contact friction force in rotation. Therefore, a stable lubricating oil film can be formed between the roller of the inner curve motor and the contact pair of the surface of the inner curve guide rail and the plunger groove, and the reliability of the inner curve hydraulic motor is improved.

Description

A split guide rail and an inner-curve radial piston motor using the split guide rail

Technical Field

The present invention relates to the technical field of inner-curve plunger motors, and in particular to a separate guide rail and its application.

Background technique

Current status: The inner-curve radial piston motor is an important power output component in the hydraulic transmission system. It has the characteristics of good low-speed stability and high output torque. Usually, there is no need to add a gearbox reduction mechanism in the transmission system for deceleration, and direct drive transmission of low-speed equipment can be achieved. At the same time, the inner-curve hydraulic motor has good processability and small size, and can be used in large-scale equipment with low speed and heavy load, such as construction machinery, ship steering control systems, characteristic vehicle drive devices, etc.

In the design of internal curve hydraulic motors, low-speed stability and high reliability are the goals pursued by the majority of design and development personnel. By improving the motion stress state of the internal moving parts of the internal curve hydraulic motor, changing the motion characteristics of the contact process between the roller and the guide rail of the internal curve hydraulic motor, especially under starting or low-speed and heavy-load conditions, the sliding friction between the roller and the internal curve guide rail during contact is reduced, the durability of the structural components is improved, and thus the working reliability of the internal curve hydraulic motor is improved.

Summary of the invention

The purpose of the present invention is to provide a separate guide rail, which can effectively change the structural characteristics of the inner curve guide rail of the inner curve hydraulic motor. Without affecting the assembly relationship of the roller structure, by changing the stress state of the roller under starting and low-speed heavy load, the movement state of the roller in the process of contact with the inner curve guide rail is changed, the sliding friction between the roller and the inner curve guide rail is reduced, the fatigue damage of the material of the structural components is improved, and the reliability of the motor as a whole is improved.

In order to solve the above technical problems, the present invention adopts the following technical solutions:

The present invention provides a split guide rail, comprising a stator guide rail and elastic guide rails arranged on both sides of the stator guide rail;

The interior of the stator guide rail is provided with a plurality of continuous curved lines and curved surfaces; elastic guide rails are provided along the inner curved lines and curved surfaces on both sides thereof.

Furthermore, the inner surface of the elastic guide rail radially protrudes from the inner surface of the stator guide rail.

Furthermore, the cross-sections of the two elastic guide rails and the stator guide rail are U-shaped.

This embodiment discloses an inner-curve radial piston motor using a split guide rail, including an output shaft;

A rotor is arranged on the output shaft and is provided with a plurality of plunger holes along the radial direction of the output shaft, and plungers are arranged in the plunger holes; a flow distribution channel is also provided on the side wall of the plunger hole;

A separate guide rail, which includes a stator guide rail and elastic guide rails located on both sides thereof;

A roller, which is located between the separate guide rail and the plunger and forms rolling friction with the separate guide rail;

The motor housing comprises a front housing and a rear housing which are arranged on the output shaft through bearings; wherein a motor oil inlet and a motor oil return port which can be connected to the distribution channel are arranged on the motor housing; and the separate guide rail is arranged between the output shaft and the front housing.

Furthermore, an elastic retaining ring, an adjusting gasket and a plunger sealing ring are arranged between the output shaft and the rotor.

Furthermore, the front housing is arranged on the output shaft through bearings I and II;

A front end cover is arranged on the end side of the front shell through a skeleton sealing ring, a gray ring I, a sealing ring fixing plate, a sealing ring I, and a front end cover screw.

Furthermore, the rear housing is arranged on the support shaft through bearing III, and a distribution plate is arranged in the rear housing and around the support shaft, wherein a flow plate oil return ring groove and a distribution plate oil inlet ring groove are formed between the distribution plate and the rear housing; the support shaft is coaxially arranged with the output shaft;

The oil return ring groove of the distribution plate and the oil inlet ring groove of the distribution plate are isolated by a grid ring III, and are connected with the motor oil return port and the motor oil inlet port respectively through the internal channel of the rear housing, wherein the oil return ring groove of the distribution plate and the oil inlet ring groove of the distribution plate are connected with the distribution channel on the rotor alternately through radially alternating oil distribution ports as the motor rotor rotates, thereby realizing the functions of oil inlet and oil return.

Furthermore, a rear end cover is provided on the end side of the rear shell through screw II; a sealing ring IV is provided between the rear end cover and the rear shell; an elastic retaining ring I is provided between the rear end cover and the support shaft, and a grid ring V is provided between the rear shell and the support shaft; and grid rings III and IV are provided between the rear end cover and the distribution plate.

Compared with the prior art, the beneficial technical effects of the present invention are:

1. Simple structure and low manufacturing cost.

A separate guide rail structure adopts a combined structure, and non-metallic guide rail structural parts are installed in the grooves on both sides of the guide rail. The contact characteristics between the roller and the inner curve motor guide rail are improved through the size of the structure. The motion state of the roller during the working process is changed to improve the lubrication characteristics between the roller and the guide rail, reduce the structural friction and wear of the roller and the inner curve guide rail, and increase the life of the motor contact pair structural parts. At the same time, it avoids the manufacturing method of enhancing the structural strength of the roller and the guide rail by improving the processing accuracy or adopting high-end heat treatment technology, and reduces the overall manufacturing cost.

2. The structural load is stable and the lubrication is reliable.

A separate guide rail structure, in which the roller contacts the non-metallic guide rails on both sides of the inner curve guide rail to generate contact friction, rolling friction is formed on the roller along the inner curve guide rail, and a dynamic pressure lubricating oil film is formed on the roller and the surface of the inner curve guide rail. The load changes during the roller movement are taken into consideration to balance the contact pressure between the roller and the inner curve surface and the roller and the plunger groove surface, so that the working structure load is stable and the reliability is high.

3. The roller force is balanced and the low-speed performance is good.

A separate guide rail structure, when the roller rotates with the plunger rotor, the driving torque formed by the friction force generated by the contact between the roller and the non-metallic guide rail structure on both sides of the stator guide rail can ensure that the fluid pressure generated by the roller and the plunger groove surface is uniform and stable, and balance the impact load generated by the roller during the movement of the stator guide rail surface. The roller forms rolling contact with the stator guide rail surface and the plunger groove surface, and the elastic oil film formed can effectively reduce the friction and wear between the roller and the contact component of the inner curve motor during startup or low-speed working conditions, improve the applicability of the inner curve motor under specific working conditions, and ensure that the inner curve motor outputs stable torsional torque.

4. The shear stress on the contact surface is small and the structural reliability is high.

A separate guide rail structure, with the help of the elastic structure of the inner curve combined guide rail, uses the friction formed by the contact between the roller and the elastic guide rail to ensure that when the inner curve motor is started or under low-speed and heavy-load conditions, the roller realizes rolling contact on the surface of the inner curve stator guide rail, forms dynamic pressure lubrication, reduces the structural stress of the contact surface between the roller and the stator guide rail, avoids friction and wear damage on the structural surface, and improves the working reliability of the inner curve motor structure.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings.

FIG1 is a schematic structural diagram of a separate guide rail according to the present invention;

FIG2 is a schematic diagram of the oil inlet and outlet structure of the motor in FIG1;

FIG. 3 is a schematic structural diagram of the stator guide rail in FIG. 1 .

Description of reference numerals:

1. Output shaft; 2. Skeleton seal ring; 3. Gly ring I; 4. Seal ring fixing plate; 5. Front cover; 6. Seal ring I; 7. Front cover screw; 8. Bearing I; 9. Front housing; 10. Bearing II; 11. Rotor; 12. Plunger; 13. Seal ring II; 14. Rubber stator guide; 15. Roller; 16. Stator guide; 17. Seal ring III; 18. Gly ring II; 19. Rear housing; 20. Screw I; 21. Screw plug I; 22. Gly ring III ; 23. Gly ring IV; 24. Gly ring V; 25. Sealing ring IV; 26. Rear end cover; 27. Elastic retaining ring I; 28. Screw II; 29. Bearing III; 30. Support shaft; 31. Distribution plate fixing pin; 32. Distribution plate oil return ring groove; 33. Distribution plate; 34. Distribution plate oil inlet ring groove; 35. Screw plug II; 36. Distribution channel; 37. Elastic retaining ring; 38. Adjustment gasket; 39. Plunger sealing ring; 40. Motor oil inlet; 41. Motor oil return.

Detailed ways

As shown in FIG. 3 , this embodiment discloses a split guide rail, including a stator guide rail 16 and elastic guide rails 14 installed on both sides of the stator guide rail 16 ;

The interior of the stator guide rail 16 is designed with a plurality of continuous curved surfaces; elastic guide rails 14 are installed on both sides along the inner curved surfaces;

In this embodiment, the inner surface of the elastic guide rail 14 radially protrudes from the inner surface of the stator guide rail 16, so as to facilitate the effect of first contacting the elastic guide rail 14 and increasing the radial friction force; in this embodiment, the cross-sections of the two elastic guide rails 14 and the stator guide rail 16 are U-shaped.

The inner surface of the stator is composed of several curved surfaces of the same shape and uniform distribution. The number of curved surfaces x is the number of times the motor works. Each concave curved surface is symmetrically divided into two halves from the vertex, one half is the oil inlet section, where the motor outputs torque outward, and the other half is the oil return section.

When the inner curve hydraulic motor is working, the high-pressure oil enters the working chamber at the bottom of the radially distributed plunger assembly of the rotor body through the oil distribution window of the distribution plate and the oil inlet channel. Under the action of the high-pressure oil, the plunger and roller are pressed and contact the inner curve stator guide rail. The stator guide rail generates a contact reaction force on the plunger roller, forming a torque around the center of the rotor along the normal direction of the stator guide rail surface, driving the rotor plunger assembly and roller to rotate together and output torque outward. The kinematic pair formed by the roller and the inner curve stator guide rail is the key kinematic pair of the inner curve radial piston motor. The roller contacts the surface of the inner curve guide rail in the plunger groove. When the motor is started or rotated at a low speed, the rolling state of the roller is uncontrolled and it is very easy to slide, causing surface damage between the roller surface and the guide rail surface, accelerating the structural fatigue failure of the roller, inner curve guide rail and plunger, and affecting the overall working life of the inner curve motor.

The present invention utilizes a novel separated guide rail structure of an inner curve radial piston motor. It is based on the principle of friction force generation between structural contact surfaces and adopts a combined inner curve guide rail with an embedded elastic component. During the contact process between the roller and the inner curve guide rail surface, the guide rail has a slight structural deformation and forms contact pressure, and additional friction force is generated between the guide rail structure and the roller, forming a rolling torque of the inner curve hydraulic motor roller when starting or working at a low speed, thereby improving the lubrication performance of the roller and the anti-wear characteristics of the inner curve guide rail and roller components of the inner curve hydraulic motor, and enhancing the reliability of the operation of the rotor and plunger assembly of the inner curve hydraulic motor.

As shown in FIG1 , this embodiment discloses an inner curve radial piston motor using a separate guide rail, which includes an output shaft 1, a rotor 11, a separate guide rail, a roller 15, and a motor housing;

The rotor 11 is mounted on the output shaft 1, and a plurality of plunger holes are opened along the radial direction of the output shaft 1, and plungers 12 are installed in the plunger holes; a flow distribution channel 36 is also opened on the side wall of the plunger hole;

The separate guide rail includes a stator guide rail 16 and elastic guide rails 14 located on both sides thereof;

The roller 15 is located between the separate guide rail and the plunger 12, and forms rolling friction with the separate guide rail;

The motor housing includes a front housing 9 and a rear housing 19 mounted on the output shaft 1 through bearings; a motor oil inlet 40 and a motor oil return port 41 connected to the distribution channel 36 are installed on the motor housing; and the separate guide rail is installed between the output shaft 1 and the front housing 9.

In this embodiment, an elastic retaining ring 37 , an adjusting gasket 38 , and a plunger sealing ring 39 are installed between the output shaft 1 and the rotor 11 .

In this embodiment, the front housing 9 is mounted on the output shaft 1 through bearings I8 and II10;

A front end cover 5 is provided on the end side of the front housing 9 through a skeleton sealing ring 2, a gray ring I 3, a sealing ring fixing plate 4, a sealing ring I 6, and a front end cover screw 7.

In this embodiment, the rear housing 19 is mounted on the support shaft 30 through the bearing III 29, and a distribution plate 33 is installed in the rear housing 19 and around the support shaft 30, wherein a flow plate oil return ring groove 32 and a distribution plate oil inlet ring groove 34 are formed between the distribution plate 33 and the rear housing 19; the support shaft 30 is coaxially arranged with the output shaft 1;

The oil return ring groove 32 of the distribution plate and the oil inlet ring groove 34 of the distribution plate are isolated by the grid ring III 22, and are connected with the motor oil return port 41 and the motor oil inlet port 40 respectively through the internal channel of the rear housing 19. The oil return ring groove 32 of the distribution plate and the oil inlet ring groove 34 of the distribution plate are connected with the distribution channel 36 on the rotor 11 alternately through radially alternating oil distribution ports as the motor rotor 11 rotates, so as to realize the oil inlet and return functions.

In this embodiment, a rear end cover 26 is installed on the end side of the rear shell 19 by means of screws II 28; a sealing ring IV 25 is installed between the rear end cover 26 and the rear shell 19; an elastic retaining ring I 27 is installed between the rear end cover 26 and the support shaft 30, and a grid ring V 24 is installed between the rear shell 19 and the support shaft 30; and a grid ring III 22 and a grid ring IV 23 are installed between the rear end cover 26 and the distribution plate 33.

Working principle of application split guide motor

When the inner curve hydraulic motor is working, the high-pressure oil introduced from the motor oil inlet 40 enters the oil inlet ring groove 34 of the distribution plate through the oil channel in the rear housing 19, and enters the cavity below the plunger 12 in the rotor 11 through the distribution channel 36 inside the distribution plate 33, pushing the plunger 12 to move along the radial plunger hole of the rotor along the plunger axis direction. The plunger pushes the roller 15 to contact the rubber stator guide 14 in the separate guide rail, and produces contact deformation under the contact extrusion of the roller. The height of the deformed guide rail curved surface is the same as the inner curve surface of the stator guide rail 16. Since the inner curve surface of the rubber stator guide rail 14 contacts the roller and generates friction, friction is generated along the tangent direction of the roller 15 surface and the inner curve surface. Since the roller 15 is subjected to the friction of the rubber stator guide rail 14, the roller 15 rotates around its own axis. Therefore, during the start-up and low-speed rotation of the inner curve motor, the roller 15 is always in a rolling friction state when in contact with the combined stator guide rail, and has a higher lubrication effect. While the combined guide rail pushes the roller 15 to generate lateral thrust on the plunger 12 to drive the rotor 11 to rotate, the pressure energy is converted into output torque, and the torque is output outward through the output shaft 1. The roller 15, driven by the stator guide rail, causes the plunger to perform a return motion. When the volume of the lower cavity of the plunger 12 decreases, the closed cavity communicates with the oil return ring groove 32 of the distributor plate through the flow channel in the rotor, and the low-pressure hydraulic oil is discharged from the oil return ring groove 32 of the distributor plate through the motor oil return port 41, forming a complete action process.

The friction characteristics of the contact pair between the roller and the inner curve guide of the inner curve motor are important factors affecting the fatigue damage of the stator guide and roller components. In order to reduce the friction between the roller and the inner curve guide during the transmission contact process, the inner curve guide is usually heat treated to improve its surface contact strength, but it cannot fundamentally improve and improve the lubrication characteristics of the roller and the inner curve guide surface. In order to achieve the effect achieved by the structure of the present invention, the surface microtexture of the inner curve guide surface can be processed, and the purpose of storing lubricating oil is achieved through the formation of microstructures to improve the lubrication performance of the inner curve guide. However, for the inner curve motor, the pressure load on the surface of the inner curve guide is relatively large at low speed and heavy load or startup, and the attenuation amplitude of the microtexture characteristics of the surface of the inner curve guide structure will increase, so it will also have a certain impact on the formation of structural friction damage between the roller and the inner curve guide. Therefore, it is necessary to start from the movement characteristics of the structure, avoid sliding friction, enhance the rolling effect of the roller during operation, promote the generation of pressure oil film, and improve the comprehensive performance of the inner curve hydraulic motor.

The above embodiments are only descriptions of the preferred methods of the invention, and are not intended to limit the scope of the invention. Without departing from the design spirit of the invention, various modifications and improvements made to the technical solutions of the invention by ordinary technicians in this field should fall within the protection scope of the claims of the invention.

Claims (8)

1. A split guide rail, characterized in that: comprises a stator guide rail (16) and elastic guide rails (14) arranged at two sides of the stator guide rail (16);

Wherein a plurality of continuous curved surfaces are arranged in the stator guide rail (16); elastic guide rails (14) are arranged on two sides of the elastic guide rail along the shape of the inner curve curved surface.

2. The split rail of claim 1, wherein: the inner surface of the elastic guide rail (14) radially protrudes from the inner surface of the stator guide rail (16).

3. The split rail of claim 2, wherein: the sections of the two elastic guide rails (14) and the stator guide rail (16) are U-shaped.

4. An inner curve radial plunger motor employing a split guide rail, employing a split guide rail according to any one of claims 1-3; the method is characterized in that: comprising

An output shaft (1);

A rotor (11) which is provided on the output shaft (1), has a plurality of plunger holes along the radial direction of the output shaft (1), and has a plunger (12) provided in the plunger holes; the side wall of the plunger hole is also provided with a flow distribution channel (36);

a split guide rail comprising a stator guide rail (16) and elastic guide rails (14) located on both sides thereof;

A roller (15) located between the split guide and the plunger (12) and forming rolling friction with the split guide;

A motor housing including a front housing (9) and a rear housing (19) provided on the output shaft (1) through bearings; wherein a motor oil inlet (40) and a motor oil return port (41) which can be communicated with the distribution channel (36) are arranged on the motor shell; the split guide rail is arranged between the output shaft (1) and the front housing (9).

5. The inner curve radial plunger motor employing split guide rails of claim 4, wherein: a circlip (37), an adjusting gasket (38) and a plunger seal ring (39) are arranged between the output shaft (1) and the rotor (11).

6. The inner curve radial plunger motor employing split guide rails of claim 4, wherein: the front shell (9) is arranged on the output shaft (1) through a bearing I (8) and a bearing II (10);

The front end cover (5) is arranged on the end side of the front shell (9) through a framework sealing ring (2), a Gelai ring I (3), a sealing ring fixing plate (4), a sealing ring I (6) and a front end cover screw (7).

7. The inner curve radial plunger motor employing split guide rails of claim 4, wherein: the rear shell (19) is arranged on the supporting shaft (30) through a bearing III (29), and a valve plate (33) is arranged in the rear shell (19) and surrounds the supporting shaft (30), wherein a valve plate oil return ring groove (32) and a valve plate oil inlet ring groove (34) are formed between the valve plate (33) and the rear shell (19); the support shaft (30) is arranged coaxially with the output shaft (1);

The valve plate oil return ring groove (32) and the valve plate oil inlet ring groove (34) are isolated through the Gelai circle III (22) and are respectively communicated with the motor oil return port (41) and the motor oil inlet (40) through internal channels of the rear shell (19), wherein the valve plate oil return ring groove (32) and the valve plate oil inlet ring groove (34) are communicated with the valve plate channels (36) on the rotor (11) along with rotation of the motor rotor (11) through radial alternately arranged oil distribution ports, so that oil feeding and return functions are realized.

8. The inner curve radial plunger motor employing split guide rails of claim 7, wherein: a rear end cover (26) is arranged on the end side of the rear shell (19) through a screw II (28); a sealing ring IV (25) is arranged between the rear end cover (26) and the rear shell (19); a circlip I (27) is arranged between the rear end cover (26) and the supporting shaft (30), and a Gellan V (24) is arranged between the rear shell (19) and the supporting shaft (30); gelai ring III (22) and Gelai ring IV (23) are arranged between the rear end cover (26) and the valve plate (33).