CN113062897B

CN113062897B - Pre-meshing hydraulic motor and mechanical equipment

Info

Publication number: CN113062897B
Application number: CN202110337340.3A
Authority: CN
Inventors: 邱明田
Original assignee: Yufan Machinery Technology Shanghai Co ltd
Current assignee: Yufan Machinery Technology Shanghai Co ltd
Priority date: 2021-03-29
Filing date: 2021-03-29
Publication date: 2023-03-31
Anticipated expiration: 2041-03-29
Also published as: CN113062897A

Abstract

The invention discloses a pre-meshing hydraulic motor and mechanical equipment, wherein the pre-meshing hydraulic motor comprises: the device comprises a shell assembly, a motor, a driving assembly, a movable sliding sleeve and a first spring; the shell assembly is provided with a first cavity and a second cavity, the second cavity is provided with a power output port, a liquid inlet and a liquid return port, and the liquid return port is communicated with the first cavity; the motor is arranged in the first chamber; the driving assembly and the movable sliding sleeve are both slidably mounted in the second chamber, one end of the driving assembly is in transmission connection with an output shaft of the motor through the spline sleeve, and the other end of the driving assembly penetrates out of the power output port; the movable sliding sleeve is rotationally connected with the driving assembly through a first bearing; the first spring is arranged in the second cavity, one end of the first spring is abutted to the cavity wall of the second cavity with the power output port, and the other end of the first spring is abutted to the end face of the first bearing. The pre-meshed hydraulic motor and mechanical equipment disclosed by the invention are simple in structure, small in size, low in failure rate and low in production cost.

Description

Pre-meshing hydraulic motor and mechanical equipment

Technical Field

The invention relates to the field of driving equipment, in particular to a pre-meshing hydraulic motor and mechanical equipment.

Background

The hydraulic motor is an actuator of a hydraulic system, and converts the pressure energy of the fluid provided by the hydraulic pump into the mechanical energy (torque and rotation speed) of its output shaft, and the fluid is the medium for transmitting force and motion. The pre-engaged hydraulic motor is one of hydraulic motors, and before the power main shaft of the pre-engaged hydraulic motor works, a motor gear needs to be engaged with an engine flywheel gear firstly, and then the power main shaft needs to rotate.

The hydraulic oil duct of the existing pre-meshing hydraulic motor is divided into a main oil duct and a control oil duct, a starting valve is arranged on the control oil duct, and after hydraulic oil enters the control oil duct, the hydraulic oil pushes mechanisms such as a shifting fork to move, so that a motor gear is meshed with an engine flywheel gear, and meanwhile, the starting valve is opened, so that the hydraulic oil enters the main oil duct to drive a power main shaft to work. The existing pre-meshing hydraulic motor has the advantages of complex structure, large volume and high failure rate.

The above is only for the purpose of assisting understanding of the technical solutions of the present application, and does not represent an admission that the above is prior art.

Disclosure of Invention

The invention mainly aims to provide a pre-meshing hydraulic motor and mechanical equipment, and aims to solve the technical problems of complex structure, large volume and high failure rate in the prior art.

To achieve the above object, the present invention provides a pre-engagement hydraulic motor including:

the shell assembly is internally provided with a first cavity and a second cavity, the second cavity is provided with a power output port, a liquid inlet and a liquid return port, the liquid inlet is communicated with a liquid supply pipeline, and the liquid return port is communicated with the first cavity through a liquid return pipeline;

a motor mounted within the first chamber;

the driving assembly is slidably mounted in the second cavity and can slide in a reciprocating manner along the axial direction of the output shaft of the motor, one end of the driving assembly is in transmission connection with the output shaft of the motor through a spline sleeve, and the other end of the driving assembly penetrates out of the power output port;

the movable sliding sleeve is arranged in the second cavity in a sliding mode and can slide in a reciprocating mode along the axial direction of an output shaft of the motor, the movable sliding sleeve is rotatably connected with the driving assembly through a first bearing, and the movable sliding sleeve slides under the pushing of hydraulic liquid supplied from the liquid inlet and drives the driving assembly connected with the movable sliding sleeve to slide from an initial position to a working position;

and the first spring is arranged in the second chamber, one end of the first spring is abutted against the wall, provided with the power output port, of the second chamber, the other end of the first spring is abutted against the end face of the first bearing, and the first spring is used for pushing the movable sliding sleeve and the driving assembly connected with the movable sliding sleeve to slide from the working position to the initial position after the liquid inlet stops supplying hydraulic liquid.

Optionally, when the driving assembly is located at the initial position, the movable sliding sleeve covers the liquid return port, and the liquid return port is isolated from the liquid inlet;

when the driving assembly is located at the working position, the movable sliding sleeve is moved away from the liquid return port, and the liquid return port is communicated with the liquid inlet through the second cavity.

Optionally, the housing assembly comprises:

the first shell defines the first chamber, one end of the first shell is provided with a first assembling hole, the motor is arranged in the first shell, and an output shaft of the motor penetrates out of the first assembling hole;

the second shell defines a second cavity, one end of the first shell is provided with a second assembly port, the other end of the first shell is provided with the power output port, the side surface of the second shell is provided with the liquid inlet and the liquid return port, the driving assembly, the movable sliding sleeve and the first spring are all arranged in the second shell, and the end part of the driving assembly, which is in transmission connection with the output shaft of the motor, penetrates out of the second assembly port;

the connecting flange is provided with a third assembling port, one end of the connecting flange is connected with the end part of the first assembling port in a detachable mode, the other end of the connecting flange is connected with the end part of the second assembling port in a detachable mode, the end part of the second assembling port is connected with the end part of the second assembling port in a detachable mode, the first assembling port is formed in the second assembling port, the third assembling port is right opposite to the first assembling port, an output shaft of the motor is arranged in the third assembling port, the spline sleeve is connected with the end part of the driving assembly in a transmission mode, and the spline sleeve is arranged in the third assembling port through a second bearing and is rotatably connected with the connecting flange.

Optionally, the spline sleeve is hermetically connected with the connecting flange at the third assembling port, and the end of the driving assembly and the output shaft of the motor are hermetically connected with the spline sleeve.

Optionally, the drive assembly comprises:

the power input shaft is slidably arranged in the second cavity and can slide in a reciprocating manner along the axial direction of the output shaft of the motor, one end of the power input shaft is in transmission connection with the output shaft of the motor through a spline sleeve, the other end of the power input shaft is provided with a clutch ratchet wheel, and the movable sliding sleeve is in rotary connection with the power input shaft through the first bearing;

and the power output shaft is coaxial with the power input shaft, is slidably mounted in the second cavity and can slide back and forth along the axial direction of the output shaft of the motor, one end of the power output shaft penetrates out of the power output port, the other end of the power output shaft is provided with a one-way ratchet matched with the clutch ratchet, the one-way ratchet is in transmission connection with the power output shaft, the one-way ratchet is meshed with the clutch ratchet to form a ratchet transmission structure, and the power input shaft is in transmission connection with the power output shaft through the ratchet transmission structure.

Optionally, the one-way ratchet is in transmission connection with the power output shaft through a bevel key structure;

the drive assembly further includes:

the anti-collision buffer cover is fixed on the power output shaft and faces towards the opening of the clutch ratchet wheel end, a second spring and the one-way ratchet wheel are arranged in the anti-collision buffer cover, one end of the second spring is abutted to the inner end face of the anti-collision buffer cover, the other end of the second spring is abutted to the end face of the one-way ratchet wheel, and the second spring is used for pushing the one-way ratchet wheel to move towards the clutch ratchet wheel under the action of restoring force of the second spring.

Optionally, the second chamber has a first step surface and a second step surface therein, the first step surface is used for abutting against the end surface of the motor away from the movable sliding sleeve, so that the driving assembly is kept at the working position, and the second step surface is used for abutting against the end surface of the motor close to the movable sliding sleeve, so that the driving assembly is kept at the initial position.

Optionally, the drive assembly comprises:

the driving main shaft is slidably installed in the second cavity and can slide in a reciprocating manner along the axial direction of the output shaft of the motor, one end of the driving main shaft is in transmission connection with the output shaft of the motor through a spline sleeve, the other end of the driving main shaft penetrates out of the power output port, and the movable sliding sleeve is in transmission connection with the driving main shaft through the first bearing;

and the output gear is detachably mounted at the end part of the driving main shaft penetrating out of the power output port.

Optionally, the movable sliding sleeve, the first bearing and the driving assembly are detachably connected.

The mechanical equipment provided by the invention comprises the pre-engagement hydraulic motor.

In the technical scheme of the invention, hydraulic fluid is supplied into the second cavity through the fluid inlet, the movable sliding sleeve is pushed to drive the driving assembly to slide, the end part of the driving assembly, which penetrates out of the power output port, is meshed with the flywheel gear of the engine, the hydraulic fluid flowing in from the fluid inlet enters the second cavity and then flows into the first cavity through the fluid return port, the driving motor is started, the output shaft of the motor rotates, power is transmitted to the driving assembly through the spline sleeve, the driving assembly drives the flywheel gear of the engine meshed with the driving assembly, structures such as a control oil duct, a starting valve, a shifting fork and the like are not needed to be arranged, the structure is simple, the number of easily damaged parts is small, the equipment volume can be reduced, the fault rate is low, the production cost is low, the output power is high under the same volume, and a product with a proper mass-power ratio can be realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is an internal schematic view of an embodiment of a pre-engagement hydraulic motor according to the present invention in an initial position;

the reference numbers indicate:

reference numerals	Name (R)	Reference numerals	Name (R)
				110	First shell	120	Connecting flange
130	Second shell	131	Liquid inlet
				132	Liquid return port	133	Power outlet
210	The first chamber	220	Second chamber
				300	Motor	400	First spring
500	Movable sliding sleeve	610	Power input shaft
				620	Power output shaft	630	Output gear
640	Locking nut	650	Clutch ratchet wheel
				660	One-way ratchet wheel	670	Second spring
680	Anti-collision buffer cover	700	Spline housing
				810	First bearing	820	Second bearing

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The application provides a mesh hydraulic motor and mechanical equipment in advance, simple structure, it is small, the fault rate is low, low in production cost.

As shown in fig. 1, in an embodiment of the pre-engagement hydraulic motor proposed by the present invention, the pre-engagement hydraulic motor includes:

the shell assembly is internally provided with a first cavity 210 and a second cavity 220, the second cavity 220 is provided with a power output port 133, a liquid inlet 131 and a liquid return port 132, the liquid inlet 131 is used for being communicated with a liquid supply pipeline, and the liquid return port 132 is communicated with the first cavity 210 through a liquid return pipeline;

a motor 300 installed in the first chamber 210;

the driving assembly is slidably mounted in the second chamber 220, can slide back and forth along the axial direction of the output shaft of the motor 300, one end of the driving assembly is in transmission connection with the output shaft of the motor 300 through the spline housing 700, and the other end of the driving assembly penetrates out of the power output port 133;

the movable sliding sleeve 500 is slidably installed in the second chamber 220 and can slide back and forth along the axial direction of the output shaft of the motor 300, the movable sliding sleeve 500 is rotatably connected with the driving assembly through a first bearing 810, and the movable sliding sleeve 500 slides under the push of the hydraulic fluid supplied from the fluid inlet 131 and drives the driving assembly connected with the movable sliding sleeve to slide from an initial position to a working position;

and a first spring 400, installed in the second chamber 220, one end of which abuts against a chamber wall of the second chamber 220 having the power output port 133, and the other end of which abuts against an end surface of the first bearing 810, wherein the first spring 400 is used for pushing the movable sliding sleeve 500 and the driving assembly connected thereto to slide from the working position to the initial position after the liquid inlet 131 stops supplying hydraulic liquid.

The first spring 400 and the movable sliding sleeve 500 can be coaxially installed outside the driving assembly, the first bearing 810 is assembled in the movable sliding sleeve 500, and the end of the first spring 400 extends into the movable sliding sleeve 500 and abuts against the end face of the first bearing 810.

The movable sliding sleeve 500 drives the driving assembly to slide so as to adjust the position of the end part of the driving assembly penetrating out from the power output port 133, and after the driving assembly slides to the working position, the end part penetrating out from the power output port 133 is meshed with a flywheel gear of the engine and outputs power to the flywheel gear of the engine.

In the above embodiment, the hydraulic fluid is supplied into the second chamber 220 through the fluid inlet 131, the movable sliding sleeve 500 is pushed to drive the driving assembly to slide, so that the end of the driving assembly, which penetrates out of the power output port 133, is engaged with the flywheel gear of the engine, the hydraulic fluid flowing in from the fluid inlet 131 enters the second chamber 220 and then flows into the first chamber 210 through the fluid return port 132, the driving motor 300 is started, the output shaft of the motor 300 rotates, the power is transmitted to the driving assembly through the spline housing 700, the driving assembly drives the flywheel gear of the engine engaged with the driving assembly, and structures such as a control oil duct, a starting valve, a shifting fork and the like are not needed to be arranged.

As a further scheme of the above embodiment, when the driving assembly is at the initial position, the movable sliding sleeve 500 covers the liquid return port 132, and the liquid return port 132 is isolated from the liquid inlet 131;

when the driving assembly is in the working position, the movable sliding sleeve 500 is moved away from the liquid return port 132, and the liquid return port 132 is communicated with the liquid inlet 131 through the second chamber 220.

The liquid inlet 131 and the liquid return port 132 may be arranged on a sidewall of the second chamber 220 in an axial direction of an output shaft of the motor 300, and a distance from the liquid inlet 131 to the motor 300 is smaller than a distance from the liquid return port 132 to the motor 300.

In a further aspect of the above embodiment, before the driving assembly reaches the working position, the liquid return port 132 is covered, the hydraulic liquid is used to push the movable sliding sleeve 500 and the driving assembly, the pressure is high, which is beneficial to pushing, and the hydraulic liquid cannot drive the motor 300 to rotate, so that the driving assembly can be prevented from rotating before the driving assembly is meshed with the flywheel gear of the engine, which is beneficial to meshing the driving assembly with the flywheel gear of the engine, and pressure loss is avoided; after the driving assembly reaches the working position, the fluid return port 132 is communicated with the fluid inlet 131 through the second chamber 220, the hydraulic fluid enters the first chamber 210, and the driving motor 300 rotates the driving assembly to output power.

As a further aspect of the above embodiment, the housing assembly includes:

a first housing 110 defining a first chamber 210, one end of the first housing 110 having a first fitting hole, the motor 300 being installed in the first housing 110, an output shaft of the motor 300 being passed through the first fitting hole;

a second housing 130 defining a second chamber 220, wherein one end of the first housing 110 has a second assembly port, the other end has a power output port 133, a side surface of the second housing 130 has a liquid inlet 131 and a liquid return port 132, a driving assembly, a movable sliding sleeve 500 and a first spring 400 are all mounted in the second housing 130, and an end portion of the driving assembly, which is in transmission connection with an output shaft of the motor 300, penetrates through the second assembly port;

the connecting flange 120 is provided with a third assembling port, one end of the connecting flange is detachably connected with the end part of the first shell 110 with the first assembling port, the other end of the connecting flange is detachably connected with the end part of the second shell 130 with the second assembling port, the first assembling port, the second assembling port and the third assembling port are opposite, the output shaft of the motor 300 is in transmission connection with the end part of the driving assembly through the spline housing 700 in the third assembling port, and the spline housing 700 is in rotational connection with the connecting flange 120 in the third assembling port through the second bearing 820.

The first housing 110, the second housing 130 and the connecting flange 120 may be connected by bolts, and the first housing 110 and the connecting flange 120 and the second housing 130 and the connecting flange 120 are hermetically connected.

In the further scheme of the embodiment, the shell assembly is split, so that later maintenance is facilitated, and the process requirements on manufacturing and assembling of products are low.

As a further solution to the above embodiment, the spline housing 700 is sealingly connected to the connecting flange 120 at the third mounting port, and the end of the drive assembly and the output shaft of the motor 300 are sealingly connected to the spline housing 700.

In a further aspect of the above embodiment, the first chamber 210 and the second chamber 220 are independent, which ensures that the hydraulic fluid in the second chamber 220 can only enter the first chamber 210 through the fluid return port 132, and avoids the pressure loss of the hydraulic fluid.

As a further aspect of the above embodiment, the drive assembly includes:

the driving main shaft is slidably mounted in the second chamber 220 and can slide back and forth along the axial direction of the output shaft of the motor 300, one end of the driving main shaft is in transmission connection with the output shaft of the motor 300 through the spline housing 700, the other end of the driving main shaft penetrates out of the power output port 133, and the movable sliding sleeve is in transmission connection with the driving main shaft through the first bearing 810;

the output gear 630 is detachably mounted on the end of the drive spindle that extends out of the power output port 133.

The output gear 630 may be fitted to the drive spindle by a coupling key and the output gear 630 may be locked to the drive spindle by a lock nut 640.

In a further scheme of the above embodiment, the output gear 630 is detachably connected with the driving spindle, so that the output gear 630 can be replaced conveniently.

As a further aspect of the above embodiment, the driving spindle includes:

a power input shaft 610, which is slidably installed in the second chamber 220 and can slide back and forth along the axial direction of the output shaft of the motor 300, one end of which is in transmission connection with the output shaft of the motor 300 through a spline housing 700, the other end of which is equipped with a clutch ratchet 650, and the movable sliding sleeve 500 is in rotational connection with the power input shaft 610 through a first bearing 810;

and a power output shaft 620 which is coaxial with the power input shaft 610, is slidably mounted in the second chamber 220, can slide back and forth along the axial direction of the output shaft of the motor 300, and has one end penetrating out of the power output port 133, an output gear 630 is detachably mounted at the end part of the power output shaft 620 penetrating out of the power output port 133, the other end is provided with a one-way ratchet 660 matched with the clutch ratchet 650, the one-way ratchet 660 is in transmission connection with the power output shaft 620, the one-way ratchet 660 is engaged with the clutch ratchet 650 to form a ratchet transmission structure, and the power input shaft 610 is in transmission connection with the power output shaft 620 through the ratchet transmission structure.

In a further aspect of the above embodiment, the power input shaft 610 and the power output shaft 620 are in transmission connection through a transmission structure formed by the one-way ratchet 660 and the clutch ratchet 650, so that the power input shaft 610 can be prevented from reversely rotating, and the motor 300 can be protected.

As a further scheme of the above embodiment, the one-way ratchet 660 is in transmission connection with the power output shaft 620 through a bevel key structure;

the drive assembly further includes:

and the anti-collision buffer cover 680 is fixed on the power output shaft 620 of the driving spindle, the end of the anti-collision buffer cover is open towards the clutch ratchet wheel 650, a second spring 670 and a one-way ratchet wheel 660 are arranged in the anti-collision buffer cover, one end of the second spring 670 is abutted against the inner end face of the anti-collision buffer cover 680, the other end of the second spring is abutted against the end face of the one-way ratchet wheel 660, and the second spring 670 is used for pushing the one-way ratchet wheel 660 to move towards the clutch ratchet wheel 650 under the action of restoring force of the second spring 670.

In the further scheme of the above embodiment, when the output gear 630 is not well engaged with the flywheel gear of the engine, a tooth collision phenomenon occurs, at this time, the second spring 670 is stressed and compressed, the power output shaft 620 drives the anti-collision buffer cover 680 to move back, and since the one-way ratchet 660 is in transmission connection with the power output shaft 620 through the inclined key structure, the power output shaft 620 rotates along with the back movement, which is beneficial to the output gear 630 sliding into the flywheel gear of the engine and the engagement of the output gear 630 and the flywheel gear of the engine.

The ratchet structure formed by the one-way ratchet 660 and the clutch ratchet 650 and used for driving and pushing out the power output shaft 620 is combined with the anti-collision buffer cover 680, the second spring 670 and the anti-collision tooth structure formed by the one-way ratchet 660 into a whole, the structure is an integrated structure, compared with a split structure formed by the two parts, the accumulation point of errors on the whole driving main shaft can be reduced, the mechanical efficiency of the driving main shaft is high, the integral axial length and weight of a product can be shortened, and the adaptability to the installation environment is improved.

As a further solution to the above embodiment, the second chamber 220 has a first step surface and a second step surface therein, the first step surface is used for abutting against the end surface of the movable sliding sleeve 500 far away from the motor 300 to keep the driving assembly at the working position, and the second step surface is used for abutting against the end surface of the movable sliding sleeve 500 near the motor 300 to keep the driving assembly at the initial position. The first step surface is arranged on the inner end surface of the second chamber 220 far from the motor 300, and the second step surface is arranged on the inner end surface of the second chamber 220 close to the motor 300.

In a further scheme of the embodiment, the first step surface and the second step surface are arranged, so that the initial position and the working position of the driving assembly can be determined and maintained conveniently, and the stable output of the driving assembly at the working position is facilitated.

As a further solution to the above embodiment, the movable sliding sleeve 500, the first bearing 810 and the driving assembly are detachably connected. The movable sliding sleeve 500, the first bearing 810 and the driving assembly may be detachably connected by a snap spring assembly.

In the further scheme of the embodiment, the disassembly and assembly are facilitated, and the maintenance is convenient.

In an embodiment of the proposed machine, the machine comprises the above-mentioned pre-engagement hydraulic motor.

The mechanical equipment can be injection molding equipment, ships, lifting machines, engineering equipment, construction equipment, coal mine equipment, mining equipment, metallurgical equipment, petrochemical equipment, port equipment and the like.

Since the mechanical device proposed by the present application adopts all the technical features of the above-mentioned embodiment of the pre-engagement hydraulic motor, at least all the advantages brought by the technical solution of the above-mentioned embodiment of the pre-engagement hydraulic motor will be obtained, and will not be described again here.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A pre-engagement hydraulic motor, comprising:

a motor mounted within the first chamber;

the movable sliding sleeve is arranged in the second cavity in a sliding mode and can slide in a reciprocating mode along the axial direction of the output shaft of the motor, the movable sliding sleeve is connected with the driving assembly in a rotating mode through a first bearing, and the movable sliding sleeve slides under the pushing of hydraulic liquid supplied from the liquid inlet and drives the driving assembly connected with the movable sliding sleeve to slide from an initial position to a working position;

the first spring is arranged in the second chamber, one end of the first spring is abutted against the wall, provided with the power output port, of the second chamber, the other end of the first spring is abutted against the end face of the first bearing, and the first spring is used for pushing the movable sliding sleeve and the driving assembly connected with the movable sliding sleeve to slide from the working position to the initial position after the liquid inlet stops supplying hydraulic liquid;

when the driving assembly is located at the initial position, the movable sliding sleeve covers the liquid return port, and the liquid return port is isolated from the liquid inlet;

2. The pre-engagement hydraulic motor of claim 1, wherein the housing assembly comprises:

the first housing defines the first chamber, one end of the first housing is provided with a first assembling port, the motor is arranged in the first housing, and an output shaft of the motor penetrates out of the first assembling port;

the second shell defines a second cavity, one end of the second shell is provided with a second assembly port, the other end of the second shell is provided with the power output port, the side surface of the second shell is provided with the liquid inlet and the liquid return port, the driving assembly, the movable sliding sleeve and the first spring are all arranged in the second shell, and the end part of the driving assembly, which is in transmission connection with the output shaft of the motor, penetrates out of the second assembly port;

3. The pre-engaged hydraulic motor of claim 2, wherein the spline housing is sealingly coupled to the coupling flange at the third mounting port, and wherein the end of the drive assembly and the output shaft of the motor are sealingly coupled to the spline housing.

4. The pre-engagement hydraulic motor of claim 1, wherein the drive assembly comprises:

the power input shaft is slidably mounted in the second cavity and can slide back and forth along the axial direction of the output shaft of the motor, one end of the power input shaft is in transmission connection with the output shaft of the motor through a spline sleeve, the other end of the power input shaft is provided with a clutch ratchet wheel, and the movable sliding sleeve is in rotary connection with the power input shaft through the first bearing;

5. The pre-engagement hydraulic motor of claim 4, wherein the one-way ratchet is drivingly connected to the power output shaft by a ramped key arrangement;

the drive assembly further includes:

6. The pre-engagement hydraulic motor of claim 1, wherein the second chamber has a first step surface therein for abutting an end surface of the movable sleeve distal from the motor to retain the drive assembly in the operating position and a second step surface therein for abutting an end surface of the movable sleeve proximal to the motor to retain the drive assembly in the initial position.

7. The pre-engagement hydraulic motor of claim 1, wherein the drive assembly comprises:

and the output gear is detachably mounted at the end part of the driving main shaft which is penetrated out from the power output port.

8. The pre-engagement hydraulic motor of claim 1, wherein the movable sleeve, the first bearing, and the drive assembly are removably coupled.

9. A machine comprising a pre-engagement hydraulic motor according to any one of claims 1-8.