CN116292066B

CN116292066B - Hydraulic motor

Info

Publication number: CN116292066B
Application number: CN202310146959.5A
Authority: CN
Inventors: 钟颖; 沈全波; 张伟; 温笑玮; 赵子乐; 赵杰
Original assignee: Ningbo Oil Control Hycdraulic Co ltd
Current assignee: Ningbo Oil Control Hycdraulic Co ltd
Priority date: 2023-02-08
Filing date: 2023-02-08
Publication date: 2024-04-23
Anticipated expiration: 2043-02-08
Also published as: CN116292066A

Abstract

The application relates to a hydraulic motor, which relates to the field of hydraulic motors, and comprises a shell, a plunger body, an end cover and an eccentric shaft, wherein an inner cavity is formed in the shell, a mounting hole is formed in the shell, the plunger body is mounted in the shell through the mounting hole, a shaft hole is formed in the shell, the eccentric shaft is rotationally connected in the shell through the shaft hole, the end cover is connected on the shell and used for blocking the mounting hole, the eccentric shaft comprises a spherical part, an output shaft and a connecting shaft, the output shaft and the connecting shaft are concentric, a connecting block is arranged between the output shaft and the connecting shaft, a clamping groove is formed in the spherical part, and the spherical part is mounted between the output shaft and the connecting shaft through clamping. The application has the effect of reducing the cost of replacing the eccentric shaft.

Description

Hydraulic motor

Technical Field

The application relates to the field of hydraulic motors, in particular to a hydraulic motor.

Background

The hydraulic motor is an executive component of a hydraulic system, can convert the hydraulic pressure energy provided by the hydraulic pump into the mechanical energy of an output shaft, further provides torque and rotating speed, can provide higher torque, and is widely applied to engineering machinery.

The related hydraulic motor comprises a shell, a plunger body and an eccentric shaft, wherein the eccentric shaft comprises a spherical part and a transmission shaft, the spherical part is connected with the transmission shaft, the axis of the transmission shaft is not coincident with the sphere center of the spherical part, the transmission shaft is rotationally connected to the shell, the spherical part is positioned in the shell, the plunger body is arranged in the shell, and the plunger body is used for stretching and pushing the spherical part, so that the eccentric shaft rotates.

The related technical scheme has the following defects that in the using process, the contact surface of the piston rod of the piston body and the eccentric shaft is easy to wear, noise or vibration is easy to generate after the eccentric shaft is worn, and the cost for replacing the eccentric shaft is high.

Disclosure of Invention

In order to reduce the cost of replacing the eccentric shaft, the application provides a hydraulic motor.

The hydraulic motor provided by the application adopts the following technical scheme:

The utility model provides a hydraulic motor, including the casing, plunger body, end cover and eccentric shaft, the inner chamber has been seted up in the casing, the mounting hole has been seted up on the casing, the plunger body passes through the mounting hole to be installed in the casing, the shaft hole has been seted up on the casing, the eccentric shaft passes through the shaft hole to be rotated and connects in the casing, the end cover is connected on the casing and is used for shutoff mounting hole, the eccentric shaft includes the ball, output shaft and connecting axle, the length direction coincidence of output shaft and connecting axle, be provided with the connecting block between output shaft and the connecting axle, the draw-in groove has been seted up on the ball, the ball passes through the joint to be installed between output shaft and connecting axle.

Through adopting above-mentioned technical scheme, through setting up the plunger body in the casing, make the plunger body move the ball through flexible top, and then make the output shaft rotate, reach the effect of output torque and rotational speed, through set up the connecting block between output shaft and connecting axle, make ball and connecting block joint, and then make the ball detachable connect between output shaft and connecting axle, after the ball surface produced wearing and tearing, the user can install new ball between output shaft and connecting axle, when output shaft output torque and fracture, the user can remain the ball and change the output shaft, and then reach the effect of reducing the cost of changing the eccentric shaft.

Optionally, the plunger body is provided with five, and five plunger bodies are arranged in the casing along the equidistant interval of output shaft circumferencial direction.

Through adopting above-mentioned technical scheme, through setting up five plunger bodies in the casing, make the plunger body set up along output shaft circumference equidistance interval in the casing to make a plurality of plunger bodies can extend in proper order and prop up and move the ball, when the eccentric shaft rotates, five plunger bodies concertina movement in proper order, and then make the output shaft can output more stable balanced moment of torsion.

Optionally, the end cover is provided with a connecting channel, the shell is provided with five oil inlet and outlet channels, the connecting channel is used for communicating the oil inlet and outlet channels and the mounting hole, the shell is connected with an oil passing device, the oil passing device is provided with an oil hole, and the oil hole is communicated with the oil inlet and outlet channels through an oil distribution disc.

Optionally, the first keyway of having seted up on the output shaft, sliding connection has the sleeve shaft coupling on the output shaft, and the draw-in groove has been seted up to sleeve shaft coupling inner wall, and the sleeve shaft coupling passes through the draw-in groove joint on the output shaft.

Through adopting above-mentioned technical scheme, through seting up keyway one on the output shaft, set up the sleeve shaft coupling on the output shaft, when output shaft and transmission shaft are connected, the user can set up sleeve shaft coupling on output shaft and transmission shaft, makes sleeve shaft coupling can transmit the moment of torsion, exists the clearance between output shaft and the transmission shaft, when the casing is installed on the casing and is produced the vibration, the output shaft has probability along axial vibration, through reserving the space between output shaft and transmission shaft, can make sleeve shaft coupling continue to transmit the moment of torsion when output shaft vibration.

Optionally, be provided with shock-absorbing mount on the casing, shock-absorbing mount includes roof, elasticity cushion and lower plate, and roof and lower plate set up respectively in elasticity cushion both sides, and the roof is connected with the casing, and the lower plate is used for being connected with the casing that is connected with the transmission shaft.

Through adopting above-mentioned technical scheme, through setting up unable adjustment base on the casing, the user is through installing the casing on last roof, fixes the lower plate on the casing, can make last roof and lower plate centre gripping elastic cushion, when producing the vibration on the casing, elastic cushion can produce deformation and absorb the mechanical energy of vibration, and then reaches the effect of vibration and noise on the reduction casing.

Optionally, the upper top plate and the lower bottom plate are circular plate structures with through holes at the centers, the elastic cushion block is arranged into a cylindrical structure, and the output shaft is used for being inserted into the through holes of the upper top plate and the lower bottom plate.

Through adopting above-mentioned technical scheme, through seting up the through-hole on last roof and lower plate, make the output shaft can insert in the through-hole and be connected with the transmission shaft, and then make the elastic cushion can surround the output shaft setting, after producing wearing and tearing between output shaft and the sleeve coupling, noise that produces when can reducing output shaft rotation reaches the effect of giving sound insulation.

Optionally, be provided with a plurality of screw thread barrels on the lower plate, screw thread barrel is perpendicular with the lower plate, and screw thread barrel passes the elastic cushion, is provided with a plurality of connecting bolts on the upper roof, and connecting bolt passes upper roof and elastic cushion and with screw thread barrel threaded connection.

Through adopting above-mentioned technical scheme, through setting up the screw thread section of thick bamboo on the lower plate, set up connecting bolt on last roof, make last roof pass through connecting bolt and be connected with the lower plate, when elasticity cushion under the oxidation elasticity changes, the user can pass through the clearance of connecting bolt adjustment upper roof and lower plate, and then make upper roof and lower plate can continue to extrude the elasticity cushion to make the elasticity cushion play the effect of absorbing vibration.

Optionally, the upper top plate, the elastic cushion block and the lower bottom plate are all arranged in two parts, wherein one part of the cross section is provided with a figure which is a major arc, and the other part of the cross section is provided with a figure which is a minor arc.

Through adopting above-mentioned technical scheme, through making roof, elastic cushion and lower plate pass through the concatenation and form, the user can be earlier with the major arc portion installation between casing and casing, makes the casing fix on the casing simultaneously with sleeve coupling joint between output shaft and transmission shaft, installs the minor arc portion between casing and casing at last, can make things convenient for the user to connect output shaft and transmission shaft.

In summary, the beneficial technical effects of the application are as follows:

1. The piston body is arranged in the shell, the eccentric shaft is rotationally connected in the shell, so that a piston rod of the piston body can push the spherical element, the output shaft rotates and outputs torque, and the spherical element is clamped between the output shaft and the connecting shaft, so that a user can conveniently replace the spherical element or the output shaft, and the effect of reducing the cost of replacing the eccentric shaft is achieved;

2. through setting up the shock-absorbing mount between casing and casing, when the casing drives the upper roof vibration, the elastic cushion can deform and absorb the vibration, and then reaches the effect of reducing casing vibration and noise;

3. Through set up the screw thread section of thick bamboo on the lower plate, set up connecting bolt on last roof, the user can be through connecting bolt adjustment upper roof and lower plate's interval, and then makes upper roof and lower plate can the centre gripping elasticity cushion all the time, makes the elasticity cushion play the effect of absorbing vibration all the time.

Drawings

Fig. 1 is a schematic diagram of the overall structure of an embodiment of the present application.

Fig. 2 is a schematic diagram of the overall structure of the second embodiment of the present application.

Fig. 3 is a schematic view of the positional relationship of the plunger body and the eccentric shaft according to the embodiment of the present application.

Fig. 4 is a schematic structural view of a housing according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a housing according to an embodiment of the application.

Fig. 6 is a schematic partial cross-sectional view of a housing of an embodiment of the present application.

Fig. 7 is a schematic view showing the overall structure of an oil distribution pan according to an embodiment of the present application.

Fig. 8 is a schematic diagram showing the overall structure of an oil distribution pan according to an embodiment of the present application.

Fig. 9 is a schematic diagram of the structure of a double-headed key according to an embodiment of the present application.

FIG. 10 is a schematic partial cross-sectional view of an end cap of an embodiment of the present application.

Fig. 11 is a schematic structural view of an eccentric shaft according to an embodiment of the present application.

Fig. 12 is a schematic view showing a connection structure of a housing and a shock-absorbing base according to an embodiment of the present application.

Fig. 13 is a schematic diagram of the connection relationship between the output shaft and the drive shaft according to an embodiment of the present application.

Fig. 14 is a schematic diagram showing a connection relationship between an upper top plate and a lower bottom plate according to an embodiment of the present application.

Reference numerals: 1. a housing; 11. a mounting hole; 12. a shaft hole; 13. an oil inlet and outlet passage; 2. a plunger body; 3. an end cap; 31. a connection channel; 4. an eccentric shaft; 41. a spherical member; 42. an output shaft; 421. a key slot I; 422. a sleeve coupling; 43. a connecting shaft; 5. an oil-passing device; 51. an oil hole; 6. a shock absorbing base; 61. an upper top plate; 611. a connecting bolt; 62. an elastic cushion block; 63. a lower base plate; 631. a thread cylinder; 7. a transmission shaft; 71. key slot II; 8. a housing; 9. an oil distribution tray; 91. a jack; 92. a through hole; 10. a double-headed key.

Detailed Description

The present application will be described in further detail with reference to the accompanying drawings.

The embodiment of the application discloses a hydraulic motor, referring to fig. 1,2 and 3, which comprises a shell 1, a plunger body 2, an end cover 3, an eccentric shaft 4 and an oil-passing device 5, wherein a mounting cavity for mounting the plunger body 2 and a shaft cavity for mounting the eccentric shaft 4 are formed in the shell 1, and the mounting cavity is communicated with the shaft cavity. The end cover 3 is arranged on the shell 1, the oil passing device 5 is connected on the shell 1, and one end of the eccentric shaft 4 extends out of the shell 1. The oil passing device 5 is used for being communicated with a hydraulic system and enabling hydraulic oil to circulate in the shell 1, the hydraulic oil can drive the plunger body 2 to periodically stretch out and draw back, and then the plunger body 2 pushes against the eccentric shaft 4, so that the eccentric shaft 4 rotates, a user can connect one end of the eccentric shaft 4 extending out of the shell 1 with the transmission shaft 7, and the effect of outputting power can be achieved.

Referring to fig. 4 and 5, five installation cavities are formed in the housing 1, each installation cavity is internally provided with a plunger body 2, five installation holes 11 are formed in the housing 1, the installation holes 11 are formed in the housing 1 at equal intervals along the circumferential direction of the center of the housing 1, the plunger bodies 2 are inserted into the housing 1 through the installation holes 11, and the length direction of each plunger body 2 is directed to the center of the housing 1. The housing 1 is provided with a shaft hole 12, and the shaft hole 12 is used for inserting the eccentric shaft 4 into the housing 1. The oil sealing plate is detachably connected to the shell 1 and used for rotating with the eccentric shaft 4 and being in sealing connection, and when the eccentric shaft 4 is installed in the shell 1, a user can install the oil sealing plate on the shell 1, so that the oil sealing plate can seal the shaft hole 12.

Referring to fig. 4 and 6, a plurality of oil inlet and outlet channels 13 are formed in the casing 1, the oil inlet and outlet channels 13 are formed in one side, far away from the shaft hole 12, of the casing 1, and when the casing 1 is connected with the oil feeder 5, the oil inlet and outlet channels 13 are communicated with the oil feeder 5, so that hydraulic oil can enter the casing 1 from the oil inlet and outlet channels 13 and push the plunger body 2 to act, and hydraulic circulation is completed. The oil through device 5 is provided with an oil hole 51, the oil hole 51 is provided with two mutually-non-communicated channels, the oil hole 51 can be respectively used as an oil inlet and an oil outlet according to different use conditions, the oil hole 51 is communicated with the oil inlet and outlet channel 13 through rotation of the oil distribution disc 9, so that the circulating flow of hydraulic oil is realized, the eccentric shaft 4 is driven to rotate through the expansion and contraction of the plunger body 2, and the eccentric shaft 4 drives the oil distribution disc 9 to rotate through the double-headed key 10 during the rotating operation of the eccentric shaft 4, so that the continuous operation of a crankshaft is realized. When the oil feeder 5 is connected with the shell 1, the opening of the oil inlet hole 51 is abutted with the shell 1 and is communicated with the oil inlet and outlet channel 13, when hydraulic oil is injected into the shell 1 from the oil inlet hole 51, the hydraulic oil can enter the shell 1 from the oil inlet and outlet channel 13 and push the plunger body 2 to act, so that the eccentric shaft 4 rotates, when the eccentric shaft 4 rotates and pushes the elongated plunger body 2, the plunger body 2 contracts and presses the hydraulic oil, so that the hydraulic oil flows out from the oil inlet and outlet channel 13 to the oil hole 51, and the high-pressure hydraulic oil is continuously injected into the shell 1, so that the eccentric shaft 4 can continuously rotate and output torque. When the oil inlet and outlet directions of the two channels in the oil hole 51 are opposite, the hydraulic motor works in the same way, but the rotation direction of the eccentric shaft 4 is opposite.

Referring to fig. 7, 8 and 9, an oil distribution disc 9 is disposed in the oil remover 5, the oil distribution disc 9 is rotatably connected in the oil remover 5, the oil distribution disc 9 is in a disc-shaped structure, a jack 91 is formed in the center of the oil distribution disc 9, a double-headed key 10 is disposed in the jack 91, one end of the double-headed key 10 is inserted into the through hole 91, the other end of the double-headed key is inserted into the jack on the end face of the connecting shaft 43, the double-headed key 10 plays a role in connection, and the connecting shaft 43 can drive the oil distribution disc 9 to rotate. The oil distribution disc 9 is provided with a plurality of through holes 92, and the through holes 92 are used for communicating the end surfaces of two sides of the oil distribution disc 9, so that hydraulic oil can flow into the shell 1 from the oil through device 5.

Referring to fig. 10, the end caps 3 are provided in plurality, the number of the end caps 3 is the same as that of the plunger body 2, and the end caps 3 are detachably connected to the housing 1 and close the mounting holes 11. When the plunger body 2 is mounted in the housing 1, the inside of the housing 1 is sealed by the cap 3 being provided in the mounting hole 11. The end cover 3 is provided with a connecting channel 31, and the connecting channel 31 is used for communicating the oil inlet and outlet channel 13 and the cavity inside the shell 1.

Referring to fig. 11, the eccentric shaft 4 includes a spherical member 41, an output shaft 42 and a connecting shaft 43, the spherical member 41 has a spherical structure, two planes are provided on the spherical member 41, the two planes are respectively located at two sides of the center of sphere of the spherical member 41, the two planes are parallel to each other, one plane is connected with the output shaft 42, the other plane is connected with the connecting shaft 43, the output shaft 42 coincides with the length direction of the connecting shaft 43, and the length directions of the output shaft 42 and the connecting shaft 43 do not coincide with the center of sphere of the spherical member 41. When the eccentric shaft 4 is inserted into the housing 1, the connecting shaft 43 is rotatably connected to the inner wall of the housing 1, and the output shaft 42 protrudes out of the housing 1. The ball 41 is located within the housing 1 and between the plurality of plunger bodies 2. When the plunger body 2 is gradually extended, the piston rod of the plunger body 2 can push against the spherical member 41 and push the spherical member 41, thereby enabling the eccentric shaft 4 to rotate in the housing 1.

In other embodiments, referring to fig. 11, the eccentric shaft 4 is formed by splicing, the output shaft 42 and the connecting shaft 43 are integrally provided, a connecting block is provided between the output shaft 42 and the connecting shaft 43, a clamping groove is provided on the spherical member 41, the connecting block is used for being inserted into the clamping groove, and the spherical member 41 is fixed between the output shaft 42 and the connecting shaft 43 by clamping. In the use process of the hydraulic motor, the contact surface of the spherical member 41 and the plunger body 2 is easy to wear, so that the spherical member 41 is deformed, the spherical member 41 is difficult to be in close contact with the plunger body 2, the output rotation speed of the eccentric shaft 4 is unbalanced, and a user can replace the worn spherical member 41, thereby playing the role of saving materials. When the torque to be borne on the eccentric shaft 4 is large, there is a risk of breakage on the output shaft 42, and when the output shaft 42 breaks, a user can replace the output shaft 42, thereby saving the material for making the spherical member 41.

Referring to fig. 11, the side wall of the output shaft 42 is provided with first key grooves 421, and the first key grooves 421 are provided at intervals along the circumference of the output shaft 42. The casing 8 is rotationally connected with a transmission shaft 7, a key slot II 71 is formed in the transmission shaft 7, a sleeve coupler 422 is mounted on the output shaft 42, the sleeve coupler 422 is of a cylindrical structure, a clamping groove is formed in the inner wall of the sleeve coupler 422, and the clamping groove is used for being clamped with the key slot I421 and the key slot II 71. When the sleeve coupling 422 is mounted on the output shaft 42, a gap exists between the output shaft 42 and the drive shaft 7.

Referring to fig. 12, a shock mount 6 is provided on the housing 1, and the shock mount 6 is for mounting on the casing 8. The shock-absorbing mount 6 includes an upper top plate 61, an elastic cushion 62 and a lower bottom plate 63, the upper top plate 61 and the lower bottom plate 63 are disc-shaped structures with circular holes in the center, and the upper top plate 61 is connected with the housing 1 through bolts. The elastic pad 62 has a cylindrical structure, and an upper top plate 61 and a lower bottom plate 63 are respectively provided on both end surfaces of the elastic pad 62. The upper top plate 61, the elastic cushion 62 and the lower bottom plate 63 are coaxially arranged, and the lower bottom plate 63 is connected with the casing 8 through bolts. When the housing 1 is mounted on the upper top plate 61, the output shaft 42 passes through the through holes of the upper top plate 61 and the lower bottom plate 63 and is disposed at the center position of the shock absorbing base 6. When the eccentric shaft 4 rotates, the shell 1 has a probability of vibrating, and the elastic cushion block 62 is arranged between the upper top plate 61 and the lower bottom plate 63, so that the elastic cushion block 62 has the effect of absorbing vibration, and the probability of generating noise of the hydraulic motor is reduced.

Referring to fig. 13 and 14, a plurality of screw barrels 631 are provided on the lower plate 63, the screw barrels 631 are perpendicular to the lower plate 63, the screw barrels 631 penetrate through the elastic pad 62, and a plurality of connection bolts 611 are provided on the upper plate 61, and the connection bolts 611 penetrate through the elastic pad 62 and are connected to the screw barrels 631. The user can adjust the interval between the upper top plate 61 and the lower bottom plate 63 through the connection bolt 611, and thus the elastic pad 62 is maintained in a contracted state, and when the housing 1 vibrates on the upper top plate 61, the elastic pad 62 can absorb the energy of the vibration.

Referring to fig. 14, the upper top plate 61, the elastic pad 62 and the lower bottom plate 63 are each composed of two parts, namely, a major arc part and a minor arc part, the figure of the cross section of the major arc part is a major arc, the figure of the cross section of the minor arc part is a minor arc, and the major arc part and the minor arc part can be spliced into a circular ring structure. By having the shock mount 6 provided in two parts, a user can remove the minor arc portion and perform inspection and connection work of the output shaft 42, thereby facilitating use.

The implementation principle of the embodiment of the application is as follows: through setting up plunger body 2 in casing 1, the eccentric shaft 4 is connected in casing 1 rotation, make plunger body 2 can move ball 41 through flexible top, and then make output shaft 42 rotate, through making ball 41 joint between output shaft 42 and connecting axle 43, the user can regularly change the ball 41 of wearing and tearing and cracked output shaft 42, thereby reduce the maintenance cost of eccentric shaft 4, through setting up shock mount 6 on casing 1, make upper plate 61 and lower plate 63 can extrude elastic cushion 62, and then make elastic cushion 62 play the effect of absorbing vibration.

The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims

1. A hydraulic motor with shock mount, its characterized in that: comprises a shell (1), a plunger body (2), an end cover (3) and an eccentric shaft (4), wherein an inner cavity is formed in the shell (1), a mounting hole (11) is formed in the shell (1), the plunger body (2) is mounted in the shell (1) through the mounting hole (11), a shaft hole (12) is formed in the shell (1), the eccentric shaft (4) is rotationally connected in the shell (1) through the shaft hole (12), the end cover (3) is connected on the shell (1) and is used for blocking the mounting hole (11), the eccentric shaft (4) comprises a spherical part (41), an output shaft (42) and a connecting shaft (43), the length directions of the output shaft (42) and the connecting shaft (43) are overlapped, a connecting block is arranged between the output shaft (42) and the connecting shaft (43), a clamping groove is formed in the spherical part (41), the spherical part (41) is mounted between the output shaft (42) and the connecting shaft (43) through clamping connection, a key groove (421) is formed in the output shaft (42), a sleeve (422) is slidingly connected on the output shaft (42), a sleeve coupling (422), a clamping groove is formed in the inner wall of the sleeve (422), the sleeve (422) is provided with the inner wall, and the sleeve (422) is arranged on the base (1) through the clamping groove, the damping base (6) comprises an upper top plate (61), an elastic cushion block (62) and a lower bottom plate (63), wherein the upper top plate (61) and the lower bottom plate (63) are respectively arranged on two sides of the elastic cushion block (62), the upper top plate (61) is connected with a shell (1), the lower bottom plate (63) is used for being connected with a shell (8) connected with a transmission shaft (7), a key slot II is formed in the transmission shaft (7), a sleeve coupling (422) is clamped in the key slot II through a clamping groove, the upper top plate (61) and the lower bottom plate (63) are circular plate structures with through holes in the center, the elastic cushion block (62) are arranged into cylindrical structures, an output shaft (42) is used for being inserted into the through holes of the upper top plate (61) and the lower bottom plate (63), a plurality of thread cylinders (631) are arranged on the lower bottom plate (63), the thread cylinders (631) are perpendicular to the lower bottom plate (63), the thread cylinders (631) penetrate through the elastic cushion block (62), a plurality of connecting bolts (611) are arranged on the upper top plate (61) and penetrate through the upper top plate (61) and the elastic cushion block (62) and are connected with the thread cylinders (611), the upper top plate (61) and the lower top plate (63) are provided with a good arc shape, the other part of the cross section is in a minor arc.

2. The hydraulic motor with shock mount according to claim 1, wherein: the five plunger bodies (2) are arranged in the shell (1) at equal intervals along the circumferential direction of the output shaft (42).

3. A hydraulic motor with shock mount according to claim 2, wherein: the oil distribution device is characterized in that a connecting channel (31) is formed in the end cover (3), five oil inlet and outlet channels (13) are formed in the shell (1), the connecting channel (31) is used for being communicated with the oil inlet and outlet channels (13) and the mounting hole (11), an oil through device (5) is connected to the shell (1), an oil hole (51) is formed in the oil through device (5), the oil hole (51) is used for being used as an oil inlet and an oil outlet respectively according to different using conditions, an oil distribution disc (9) is rotatably connected to the shell (1), a double-headed key (10) is clamped on the eccentric shaft (4), the double-headed key (10) is used for being connected with the eccentric shaft (4) and the oil distribution disc (9), the oil hole (51) is communicated with the oil inlet and outlet channels (13) through rotation of the oil distribution disc (9), accordingly hydraulic oil can circularly flow, the eccentric shaft (4) is driven to rotate through expansion of the plunger body (2), and the eccentric shaft (4) is driven to rotate according to different using conditions, and the eccentric shaft (4) is continuously operated.