CN219139251U

CN219139251U - Swing cylinder type radial plunger hydraulic motor

Info

Publication number: CN219139251U
Application number: CN202320080631.3U
Authority: CN
Inventors: 王家豪; 胡品容; 李成志; 赵崇碧; 张红娟
Original assignee: Ningbo Stf Hydraulic Transmissions Co ltd
Current assignee: Ningbo Stf Hydraulic Transmissions Co ltd
Priority date: 2023-01-12
Filing date: 2023-01-12
Publication date: 2023-06-06
Anticipated expiration: 2033-01-12

Abstract

The utility model provides a swing cylinder type radial plunger hydraulic motor, which comprises a shell, a crankshaft arranged in the shell, and plunger cylinders circumferentially arranged in the shell, wherein ear holes corresponding to the plunger cylinders are arranged in the shell, and trunnions hinged with the ear holes are arranged on a cylinder body of the plunger cylinders; a flow passage through which high-pressure oil flows is arranged in the cylinder body, and the flow passage is communicated with the inner cavity of the trunnion; one end of a piston rod of the plunger cylinder is inserted into the cylinder body and communicated with the flow channel, and the other end of the piston rod is connected with the crankshaft through a shaft sleeve; the wall of the ear hole is provided with an oil storage groove, and the trunnion is provided with an oil guiding hole which is communicated with the oil storage groove and the inner cavity. When the utility model is used, high-pressure oil in the oil storage tank can provide continuous lubrication for the swing of the plunger cylinder.

Description

Swing cylinder type radial plunger hydraulic motor

Technical Field

The utility model relates to the technical field of hydraulic motors, in particular to a tilt cylinder type radial plunger hydraulic motor.

Background

As a main component in providing a high torque hydraulic system, a tilt cylinder type radial plunger hydraulic motor directly affects the mechanical working efficiency under actual working conditions. The hydraulic system can work stably and reliably at very low rotation speed, can be directly connected with a working mechanism which needs to run at low speed, simplifies the whole structure, has the advantages of acceptable efficiency and longer service life, and is widely applied to hydraulic systems of light industrial machinery, engineering machinery, mining machinery, hoisting and transporting machinery, ship deck machinery, agricultural machinery and the like.

The swing cylinder type radial plunger hydraulic motor comprises a shell, an oil distribution disc, a crankshaft and a swing cylinder (also called as a plunger cylinder), wherein the swing cylinder is circumferentially arranged in the shell, the oil distribution disc is arranged on the shell and used for injecting high-pressure oil into the swing cylinder to drive a piston rod of the swing cylinder to stretch and retract, and the crankshaft is arranged in a shaft hole of the shell and is connected with a piston rod output end bearing of the swing cylinder in the shell. During operation, high-pressure oil is injected into different balance cylinders one by one through the oil distribution disc, and piston rods of the balance cylinders stretch one by one under the action of the high-pressure oil pressure, so that the crankshaft is driven to rotate to output power outwards. In the structure of this hydraulic motor, there are three friction pairs: the oil distribution disc and the shell rotate along with the crankshaft during rotation; the shell and the swinging cylinder swing left and right in the structural operation, and the trunnion of the swinging cylinder has angular rotation friction in the lug hole of the shell; the plunger in the swing cylinder body makes reciprocating friction motion, in the motion, surface contact friction can be generated in all three friction pairs, and the friction pair can be worn in the motion when the friction force is overlarge. To reduce the friction at the three friction pairs, this can be achieved by reducing the coefficient of friction or the forward pressure between the two component contact surfaces at the friction pair. In order to reduce friction force when the shell is in contact with the surface of the balance cylinder, lubricating oil is generally smeared in an ear hole of the shell in the prior art, namely, the lubricating oil is coated in a gap between the outer wall of the trunnion of the balance cylinder and the wall of the ear hole of the shell, so that a lubricating effect when the balance cylinder swings is realized, however, when the balance cylinder swings for a long time, the lubricating oil in the ear hole of the shell is consumed, and if the lubricating oil in the ear hole is consumed and cannot be supplemented, the balance cylinder swings in a non-lubricated state all the time, so that the balance cylinder trunnion and the ear hole of the shell are worn.

Disclosure of Invention

The utility model solves the problems that: overcomes the defects in the prior art and provides a swing cylinder type radial plunger hydraulic motor which can provide continuous lubrication for the swing of a plunger cylinder.

In order to solve the problems, the utility model provides a swing cylinder type radial plunger hydraulic motor, which comprises a shell, a crankshaft arranged in the shell, and plunger cylinders circumferentially arranged in the shell, wherein lug holes corresponding to the plunger cylinders are arranged in the shell, and trunnions hinged with the lug holes are arranged on a cylinder body of the plunger cylinders; a flow passage through which high-pressure oil flows is arranged in the cylinder body, and the flow passage is communicated with the inner cavity of the trunnion; one end of a piston rod of the plunger cylinder is inserted into the cylinder body and communicated with the flow channel, and the other end of the piston rod is connected with the crankshaft through a shaft sleeve; the wall of the ear hole is provided with an oil storage groove, and the trunnion is provided with an oil guiding hole which is communicated with the oil storage groove and the inner cavity.

Compared with the prior art, the utility model has the advantages that: according to the utility model, the oil storage groove and the oil guide hole are arranged, so that high-pressure oil in the cylinder body flow channel can be continuously injected into the oil storage groove through the oil guide hole when the hydraulic pump works, so that the problem of mutual abrasion caused by the fact that the trunnion swings in the lug hole under the condition of no lubrication of lubricating oil is solved, and finally the service life of the shell and the plunger cylinder can be prolonged compared with the scheme that lubricating oil is injected into the connecting gap between the trunnion and the lug hole at one time in the prior art.

As an improvement, the oil storage tank is arranged on the wall of the lug hole at one side far away from the piston rod. After the structure is used, when the high-pressure oil in the cylinder body runner pushes the piston rod to stretch out under the action of oil pressure, the piston rod can generate a reaction force towards the trunnion direction of the plunger cylinder, the reaction force can increase the forward pressure between the hole wall of the trunnion on one side of the piston rod and the outer wall of the trunnion of the plunger cylinder, the forward pressure can increase the friction force of the trunnion when swinging in the trunnion, and the trunnion wear, at the moment, the oil pressure of the high-pressure oil in the oil storage tank in the structure can be utilized to partially balance the reaction force, so that the friction force of the trunnion when swinging in the trunnion is reduced by reducing the forward pressure between the hole wall of the trunnion on one side of the piston rod and the outer wall of the trunnion of the plunger cylinder, and finally the purposes of reducing the wear of the trunnion and the trunnion are achieved, and prolonging the service life of the plunger cylinder and the shell are achieved.

As an improvement, the oil storage tank comprises a warp tank and a weft tank which are communicated with each other, wherein the warp tank extends along the axial direction of the earhole, and the weft tank extends along the circumferential direction of the earhole and is distributed at intervals along the axial direction of the earhole; the oil guiding hole is communicated with the weft groove. After the structure is applied, the oil storage tank is ensured to have enough volume, and meanwhile, the structural strength of the shell earhole can be better maintained; meanwhile, the oil guiding hole is communicated with the weft groove, so that high-pressure oil in the flow passage can always flow into the oil storage groove through the oil guiding hole when the plunger cylinder swings.

As an improvement, a sealing ring is arranged between the outer wall of one end of the piston rod and the inner wall of the cylinder body. After the structure is applied, the sealing strength between the outer wall of one end of the piston rod and the inner wall of the cylinder body can be increased by the sealing ring, so that the problem of high-pressure oil leakage in the flow passage of the cylinder body can be avoided.

As an improvement, a blind groove is arranged at the end part of one end of the piston rod, and the blind groove is communicated with the flow passage. After the structure is applied, the volume inside the cylinder body can be increased, more high-pressure oil flows into the cylinder body to drive the piston rod to stretch out and draw back, and meanwhile, the contact area between the high-pressure oil and one end of the piston rod can be increased through the arrangement of the blind groove, so that the high-pressure oil in the flow channel can be ensured to push the piston rod more smoothly.

As an improvement, the end part of the other end of the piston rod is provided with an arc clamping part matched with the outer circumferential wall of the shaft sleeve. After the structure is applied, a larger contact surface is ensured between the end part of the other end of the piston rod and the outer circumferential wall of the shaft sleeve, so that the plunger cylinder can better push the crankshaft to rotate.

Drawings

FIG. 1 is a first perspective view of the present utility model;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is an enlarged view at B in FIG. 2;

FIG. 4 is a second subsidiary perspective view of the utility model;

fig. 5 is a cross-sectional view taken along line C-C in fig. 4.

Reference numerals illustrate:

1. a housing; 11. ear holes; 2. a crankshaft; 3. a plunger cylinder; 31. a cylinder; 311. a trunnion; 3110. an inner cavity; 312. a flow passage; 32. a piston rod; 4. a shaft sleeve; 5. an oil storage tank; 51. passing through a groove; 52. weft grooves; 6. an oil guiding hole; 7. a seal ring; 8. a blind groove; 9. arc joint portion.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

As shown in fig. 1 to 3, in the present utility model, the tilt cylinder type radial plunger hydraulic motor comprises a housing 1, a crankshaft 2 provided in the housing 1, and plunger cylinders 3 circumferentially arranged in the housing 1, wherein the housing 1 is provided with lugs 11 provided corresponding to the plunger cylinders 3, and a cylinder body 31 of the plunger cylinders 3 is provided with trunnions 311 hinged with the lugs 11; a flow passage 312 through which high-pressure oil flows is provided in the cylinder 31, and the flow passage 312 communicates with an inner cavity 3110 of the trunnion 311; one end of a piston rod 32 of the plunger cylinder 3 is inserted into the cylinder body 31 and is communicated with the flow channel 312, and the other end of the piston rod 32 is connected with the crankshaft 2 through the shaft sleeve 4; the wall of the ear hole 11 is provided with an oil storage tank 5, and the trunnion 311 is provided with an oil guiding hole 6 which communicates the oil storage tank 5 with the inner cavity 3110.

Compared with the prior art, the utility model has the advantages that: according to the utility model, the oil storage tank 5 and the oil guide hole 6 are arranged, so that when the hydraulic pump works, high-pressure oil in the flow channel 312 of the cylinder body 31 can be continuously injected into the oil storage tank 5 through the oil guide hole 6 for lubrication when the trunnion 311 swings in the ear hole 11, and compared with the scheme that lubricating oil is injected into a connecting gap between the trunnion 311 and the ear hole 11 at one time in the prior art, the high-pressure oil used for lubrication when the trunnion 311 swings in the ear hole 11 is always stored in the oil storage tank 5, the condition that the high-pressure oil is consumed by the trunnion 311 swinging in the ear hole 11 for a long time is not existed, and a small friction coefficient exists between the trunnion 311 and the ear hole 11 under the lubrication action of the high-pressure oil in the oil storage tank 5, so that the problem that the trunnion 311 swings in the ear hole 11 under the condition of no lubrication of lubricating oil, so that mutual abrasion is caused can be avoided, and finally, the service lives of the shell 1 and the plunger cylinder 3 can be prolonged.

As shown in fig. 2, the oil reservoir 5 is provided on the wall of the ear hole 11 on the side remote from the piston rod 32. After the structure is applied, when the high-pressure oil in the flow channel 312 of the cylinder body 31 pushes the piston rod 32 to extend under the action of oil pressure, the piston rod 32 generates a reaction force towards the trunnion 311 of the plunger cylinder 3, the reaction force increases the forward pressure between the wall of the trunnion 11 far away from the piston rod 32 and the outer wall of the trunnion 311 of the plunger cylinder 3, the forward pressure increases the friction force when the trunnion 311 swings in the trunnion 11, and the abrasion of the trunnion 311 and the trunnion 11 is accelerated, at the moment, the oil pressure of the high-pressure oil in the oil storage tank 5 in the structure can play a part of balancing the reaction force, thereby playing the role of reducing the friction force when the trunnion 311 swings in the trunnion 11 by reducing the forward pressure between the wall of the trunnion 11 far away from the piston rod 32 and the outer wall of the trunnion 311 of the plunger cylinder 3, and finally achieving the purposes of reducing the abrasion of the trunnion 311 and the trunnion 11 and prolonging the service life of the plunger cylinder 3 and the shell 1.

As shown in fig. 2 and 3, the oil storage tank 5 includes a warp groove 51 and a weft groove 52 which are communicated with each other, the warp groove 51 being provided to extend in the axial direction of the ear hole 11, the weft groove 52 being provided to extend in the circumferential direction of the ear hole 11 and being spaced apart in the axial direction of the ear hole 11; the oil introduction hole 6 communicates with the weft groove 52. After the structure is applied, the structural strength of the ear hole 11 of the shell 1 can be better maintained while the oil storage tank 5 has enough volume; at the same time, the oil introduction hole 6 is communicated with the weft groove 52, so that high-pressure oil in the flow passage 312 can always flow into the oil storage groove 5 through the oil introduction hole 6 when the plunger cylinder 3 swings.

As shown in fig. 4 and 5, a seal ring 7 is provided between the outer wall of one end of the piston rod 32 and the inner wall of the cylinder 31. After the structure is applied, the sealing ring 7 can increase the sealing strength between the outer wall of one end of the piston rod 32 and the inner wall of the cylinder 31, so that the problem of high-pressure oil leakage in the flow channel 312 of the cylinder 31 can be avoided.

As shown in fig. 4 and 5, the end of the piston rod 32 at one end is provided with a blind groove 8, and the blind groove 8 communicates with the flow passage 312. After the structure is applied, the volume inside the cylinder 31 can be increased, more high-pressure oil can be ensured to flow into the cylinder 31 to drive the piston rod 32 to stretch and retract, and meanwhile, the contact area between the high-pressure oil and one end of the piston rod 32 can be increased by the arrangement of the blind groove 8, so that the high-pressure oil in the flow channel 312 can be ensured to push the piston rod 32 more smoothly.

As shown in fig. 4 and 5, the end of the other end of the piston rod 32 is provided with an arc-shaped clamping portion 9 adapted to the outer circumferential wall of the sleeve 4. With this structure, a larger contact surface is ensured between the end of the other end of the piston rod 32 and the outer circumferential wall of the sleeve 4, so that the plunger cylinder 3 can better push the crankshaft 2 to rotate.

Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the utility model.

Claims

1. The swing cylinder type radial plunger hydraulic motor comprises a shell (1), a crankshaft (2) arranged in the shell (1) and plunger cylinders (3) circumferentially arranged in the shell (1), wherein lug holes (11) corresponding to the plunger cylinders (3) are formed in the shell (1), and trunnions (311) hinged with the lug holes (11) are formed in a cylinder body (31) of the plunger cylinders (3); a flow passage (312) through which high-pressure oil flows is arranged in the cylinder body (31), and the flow passage (312) is communicated with an inner cavity (3110) of the trunnion (311); one end of a piston rod (32) of the plunger cylinder (3) is inserted into the cylinder body (31) and is communicated with the flow channel (312), and the other end of the piston rod (32) is connected with the crankshaft (2) through a shaft sleeve (4); the method is characterized in that: an oil storage groove (5) is formed in the wall of the lug hole (11), and an oil guiding hole (6) for communicating the oil storage groove (5) with the inner cavity (3110) is formed in the trunnion (311).

2. The tilt cylinder radial plunger hydraulic motor of claim 1, wherein: the oil storage tank (5) is arranged on the wall of the lug hole (11) at one side far away from the piston rod (32).

3. The tilt cylinder radial plunger hydraulic motor of claim 2, wherein: the oil storage tank (5) comprises a warp tank (51) and a weft tank (52) which are communicated with each other, the warp tank (51) extends along the axial direction of the earhole (11), and the weft tank (52) extends along the circumferential direction of the earhole (11) and is distributed at intervals along the axial direction of the earhole (11); the oil guiding hole (6) is communicated with the weft groove (52).

4. The tilt cylinder radial plunger hydraulic motor of claim 1, wherein: a sealing ring (7) is arranged between the outer wall of one end of the piston rod (32) and the inner wall of the cylinder body (31).

5. The tilt cylinder radial plunger hydraulic motor of claim 1, wherein: the end part of one end of the piston rod (32) is provided with a blind groove (8), and the blind groove (8) is communicated with the flow channel (312).

6. The tilt cylinder radial plunger hydraulic motor of claim 1, wherein: the end part of the other end of the piston rod (32) is provided with an arc-shaped clamping part (9) which is matched with the outer circumferential wall of the shaft sleeve (4).