阅读说明：本技术 一种液压驱动内燃机缸孔加工珩磨头及其液压回路 (Honing head for machining cylinder hole of hydraulic drive internal combustion engine and hydraulic loop of honing head ) 是由 吕延军 罗宏博 于 2020-06-29 设计创作，主要内容包括：本发明公开了一种液压驱动内燃机缸孔加工珩磨头及其液压回路,珩磨头主要由输入传动轴、双作用液压缸、单作用液压缸、配油盘等组成,双作用液压缸缸体内表面周向均匀分布3个矩形凹槽,活塞外圆表面均匀分布3个矩形凸键,使双作用液压缸不仅能实现轴向往复直线运动,也可以实现周向旋转运动；单作用液压缸由珩磨体、推杆、复位弹簧、油石座,涨缩弹簧,油石组成,推杆在液压力和复位弹簧力的作用下可实现直线往复移动,推杆外圆回转面的两个圆锥面和油石座内圆锥面的配合,实现油石的径向移动。本发明使内燃机缸孔珩磨工作稳定,从而达到内燃机缸孔加工表面圆柱度和直线度的高精度等级,大大提高内燃机工作效率和缸孔表面质量。(The invention discloses a honing head for processing a cylinder hole of a hydraulically driven internal combustion engine and a hydraulic loop thereof, wherein the honing head mainly comprises an input transmission shaft, a double-acting hydraulic cylinder, a single-acting hydraulic cylinder, an oil distribution disc and the like, wherein 3 rectangular grooves are uniformly distributed on the circumferential direction of the inner surface of the cylinder body of the double-acting hydraulic cylinder, and 3 rectangular convex keys are uniformly distributed on the outer circumferential surface of a piston, so that the double-acting hydraulic cylinder can realize axial reciprocating linear motion and circumferential rotary motion; the single-action hydraulic cylinder consists of a honing body, a push rod, a return spring, an oilstone seat, a collapsible spring and an oilstone, wherein the push rod can linearly reciprocate under the action of hydraulic pressure and the action of the return spring, and two conical surfaces of an excircle revolution surface of the push rod are matched with an inner conical surface of the oilstone seat to realize radial movement of the oilstone. The invention ensures that the internal combustion engine cylinder hole honing work is stable, thereby achieving the high-precision grade of the cylindricity and the straightness of the processing surface of the internal combustion engine cylinder hole, and greatly improving the working efficiency of the internal combustion engine and the surface quality of the cylinder hole.)

1. A honing head for processing a cylinder hole of a hydraulic drive internal combustion engine is characterized by comprising an input transmission shaft (1), a double-acting hydraulic cylinder (29), a single-acting hydraulic cylinder (31), an oil distribution disc (17) and a support bearing (18);

the double-acting hydraulic cylinder (29) comprises a cylinder body (2), the input transmission shaft (1) is fixed on the left end cover of the cylinder body (2), a piston (4) in the cylinder body (2) divides the cylinder body (2) into a left working oil cavity and a right working oil cavity, a right oil port (15) penetrates through the right end cover of the double-acting hydraulic cylinder (29) to be connected with the right working oil cavity, a left oil port (16) penetrates through the left end cover of the double-acting hydraulic cylinder (29) to be connected with the left working oil cavity, the right end of the piston (4) is connected with one end of a piston rod (6), and the piston rod (6) completes the sealing between the right end cover of the double-;

the single-action hydraulic cylinder (31) consists of a honing body (14), a push rod (13), a return spring (12), an oilstone seat (9), a collapsible spring (10) and an oilstone (11), the honing body (14) is rigidly connected with the other end of the piston rod (6), the left end of the push rod (13) and the honing body (14) form a closed working oil chamber, a single-action hydraulic cylinder oil port (8) penetrates through the left end cover of the single-action hydraulic cylinder (31) to be connected with the working oil chamber, a return spring (12) is arranged between the right end of the push rod (13) and the right end of the honing body (14), the oilstone (11) is arranged on the oilstone seat (9) through the expansion spring (10), the oilstone seats (9) are arranged in oilstone seat grooves which are uniformly distributed on the circumference of the cylinder body of the single-action hydraulic cylinder (31), the circumferential outer conical surface of the push rod (13) is tightly matched with the inner conical surface on the oilstone seat (9);

The oil distribution disc (17) is fixedly connected with the outer ring of the support bearing (18) and is respectively arranged on a left end cover and a right end cover of a double-acting hydraulic cylinder (29) and a left end cover of a single-acting hydraulic cylinder (31), a rotary friction pair is formed between the oil distribution disc (17) and the end cover of the cylinder body, and an oil distribution groove is arranged on the oil distribution disc (17).

2. A honing head for the bore of a hydraulically driven combustion engine according to claim 1, characterized in that the evenly distributed convex keys (5) on the outer circumference of the piston (4) are closely fitted with evenly distributed concave grooves (3) on the inner cylindrical surface of the cylinder block (2).

3. A hydraulically driven internal combustion engine cylinder bore honing head according to claim 2, characterized in that the recesses (3) are rectangular in number of 3, and the male keys (5) are rectangular in number of 3.

4. The honing head for the cylinder bore of a hydraulically driven internal combustion engine according to claim 1, wherein there are 8 of the right oil port (15), the left oil port (16) and the single acting cylinder oil port (8), respectively.

5. A honing head for the bore machining of a hydraulically driven combustion engine according to any of the claims 1 to 4, characterized in that the outer circumferential surface of the push rod (13) has two conical surfaces of revolution which cooperate with the conical surfaces of the inner circumferential surface of the whetstone holder (9).

6. The honing head hydraulic circuit for processing the cylinder hole of the hydraulically driven internal combustion engine according to claim 1, which is characterized by comprising a honing head axial reciprocating motion oil way, a honing head rotary motion oil way, an oilstone radial expansion oil way, three oil ways which are independently controlled, and a hydraulic pump station (19) for providing a power source for the hydraulic circuit;

pressure oil of an oil way with the honing head axially reciprocating enters a one-way valve (20) through a hydraulic pump station (19), the one-way valve (20) mainly prevents backflow of the pressure oil of a working circuit in the oil way, and an energy accumulator (21) can reduce pressure impact in the oil way and maintain the pressure stability of the system; the two-way hydraulic lock (28) between the three-position four-way electromagnetic directional valve (25) and the double-acting hydraulic cylinder (29) is formed by connecting 2 hydraulic control one-way valves in parallel, the pressure of the opposite oil way of each one-way valve is taken as pilot pressure, when the three-position four-way electromagnetic directional valve (25) is positioned at the middle position, the pilot pressures of the two one-way valves are equal, the one-way valves are closed, the acting forces of the left working oil cavity and the right working oil cavity of the double-acting hydraulic cylinder (29) are balanced, and the axial positions of the; when the honing head axially feeds, the honing head axial motion control signal (22) enables the right position of the three-position four-way electromagnetic directional valve (25) to be electrified, the left hydraulic control one-way valve of the two-way hydraulic lock (28) is opened, the left oil port (16) on the left working oil cavity of the double-acting hydraulic cylinder (29) is filled with oil, the left working oil cavity is pressed, the volume is increased, the piston (4) is pushed to move rightwards, the right oil port (15) on the right working oil cavity returns oil, and the piston (4) drives the piston rod (6) and the honing body (14) rigidly connected to the piston rod (6) to move rightwards, so that the axial feeding of the; the honing head axial motion control signal (22) enables the three-position four-way electromagnetic directional valve (25) to be electrified at the left position, the right hydraulic control one-way valve of the two-way hydraulic lock (28) is opened, the right oil port (15) on the right working oil cavity of the double-acting hydraulic cylinder (29) is filled with oil, the right working oil cavity is pressurized, the volume is increased, the piston (4) is pushed to move to the left, the left oil port (16) on the left working oil cavity returns oil, the piston (4) drives the piston rod (6) and the honing body (14) which is rigidly connected to the piston rod (6) to move to the left, the axial retraction of the honing head is completed, and;

The normal state of the two-position four-way electromagnetic reversing valve (26) in the honing head rotary motion oil path is the right position, when the honing head rotary motion control signal (23) is electrified and the left position of the two-position four-way electromagnetic reversing valve (26) works, the variable hydraulic motor (30) converts pressure energy into rotary mechanical energy, and torque and rotating speed are transmitted to the honing body (14) through the input transmission shaft (1) to drive the honing head to rotate;

when two-position tee bend electromagnetic directional valve (27) left position during operation in the oilstone radial expansion oil circuit, the oil feed of single action jar hydraulic fluid port (8) on single action pneumatic cylinder (31) working oil chamber, promote push rod (13) and move to the right, the axial displacement of push rod (13) turns into the radial displacement of oilstone seat (9), oilstone (11) expansion, turn into the honing operating pressure of oilstone (11) with the hydraulic pressure force in working oil chamber, on the contrary, when two-position tee bend electromagnetic directional valve (27) right position during operation, single action pneumatic cylinder (31) working oil chamber pressure release, move to the left under push rod (13) reset spring (12) effect, oilstone seat (9) withdrawal, the oilstone pressure release.

Technical Field

The invention relates to the technical field of internal combustion engine cylinder hole honing, in particular to a hydraulically-driven internal combustion engine cylinder hole honing head and a hydraulic circuit thereof.

Background

The internal combustion engine is used as a power machine with high thermal efficiency and is widely applied to various fields of the national civilization. In recent decades, with the increasingly prominent problems of global non-renewable energy shortage, environmental protection and the like, the requirements on the fuel efficiency and the environmental protection of the internal combustion engine are higher and higher. The cylinder body is used as a main body part of the internal combustion engine, a cylinder hole of the cylinder body serves as a main place for doing work by burning fuel and doing work by reciprocating a piston when the internal combustion engine works, and the processing precision and the processing quality of the cylinder hole have important influence on the working characteristics of the engine.

Most of the existing internal combustion engine cylinder hole honing devices are mechanical transmission devices, the structures of the transmission devices are complex, and the number of machining processes is large, so that the accumulated error is large, and the machining precision grade is not high. The hydraulic drive is adopted, the power transmission is stable and reliable, the structure is simple and reasonable, the control precision and the automation degree are higher, the problem that the machining precision grade of the cylinder hole of the conventional internal combustion engine is not high can be solved, and the hydraulic drive system plays a great role in improving the working efficiency and the economic benefit of enterprises.

Disclosure of Invention

The invention aims to provide a honing head for honing a cylinder hole of an internal combustion engine, which has the advantages of simple structure, stability, reliability and high control precision, and solves the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

a honing head for processing a cylinder hole of a hydraulically driven internal combustion engine comprises an input transmission shaft, a double-acting hydraulic cylinder, a single-acting hydraulic cylinder, an oil distribution disc and a support bearing;

the double-acting hydraulic cylinder comprises a cylinder body, the input transmission shaft is fixed on a left end cover of the cylinder body, a piston in the cylinder body divides the cylinder body into a left working oil cavity and a right working oil cavity, a right oil port is penetrated through a right end cover of the double-acting hydraulic cylinder to be connected with the right working oil cavity, a left oil port is penetrated through a left end cover of the double-acting hydraulic cylinder to be connected with the left working oil cavity, the right end of the piston is connected with one end of a piston rod, and the piston rod completes;

the single-action hydraulic cylinder consists of a honing body, a push rod, a return spring, an oilstone seat, a collapsible spring and oilstones, wherein the honing body is rigidly connected with the other end of the piston rod, the left end of the push rod and the honing body form a closed working oil cavity, a single-action hydraulic cylinder oil port is penetrated through the left end cover of the single-action hydraulic cylinder to be connected with the working oil cavity, the return spring is arranged between the right end of the push rod and the right end of the honing body, the oilstones are arranged on the oilstone seat through the collapsible spring, the oilstone seat is arranged in oilstone seat grooves which are uniformly distributed in the circumferential direction of the cylinder body of the single-action hydraulic cylinder, and the outer conical surface in the circumferential direction of;

The oil distribution disc is fixedly connected with the outer ring of the supporting bearing and is respectively arranged on the left end cover of the double-acting hydraulic cylinder, the right end cover and the left end cover of the single-acting hydraulic cylinder, a rotary friction pair is formed between the oil distribution disc and the end cover of the cylinder body, and an oil distribution groove is formed in the oil distribution disc.

Furthermore, the uniformly distributed convex keys on the outer circumference of the piston are tightly matched with the uniformly distributed grooves on the inner cylindrical surface of the cylinder body.

Furthermore, the grooves are rectangular and 3 in number, and the convex keys are rectangular and 3 in number;

furthermore, the right oil port, the left oil port and the single-acting cylinder oil port are respectively 8.

Furthermore, two conical revolution surfaces are arranged on the outer circular surface of the push rod and are matched with the conical surface on the inner circular surface of the oilstone seat.

A hydraulic circuit of a honing head for processing a cylinder hole of a hydraulically-driven internal combustion engine comprises an axial reciprocating motion oil way of the honing head, a rotary motion oil way of the honing head, a radial expansion oil way of oilstone, three oil ways which are independently controlled, and a hydraulic pump station which provides a power source for the hydraulic circuit;

the honing head axially reciprocates oil way pressure oil to enter the one-way valve through the hydraulic pump station, the one-way valve mainly prevents the backflow of the pressure oil of a working loop in the oil way, and the energy accumulator can reduce pressure impact in the oil way and maintain the pressure stability of the system; the two-way hydraulic lock between the three-position four-way electromagnetic directional valve and the double-acting hydraulic cylinder is formed by connecting 2 hydraulic control one-way valves in parallel, the pressure of the opposite oil way of each one-way valve is taken as pilot pressure, when the three-position four-way electromagnetic directional valve is positioned at the middle position, the pilot pressures of the two one-way valves are equal, the one-way valves are closed, the acting forces of the left working oil cavity and the right working oil cavity of the double-acting hydraulic cylinder are balanced, and the axial positions; when the honing head axially feeds, the honing head axial motion control signal enables the right position of the three-position four-way electromagnetic directional valve to be electrified, the left hydraulic control one-way valve of the bidirectional hydraulic lock is opened, the left oil port on the left working oil cavity of the double-acting hydraulic cylinder is filled with oil, the left working oil cavity is pressed, the volume is increased, the piston is pushed to move rightwards, the right oil port on the right working oil cavity returns oil, and the piston drives the piston rod and the honing body rigidly connected to the piston rod to move rightwards, so that the axial feeding of the; the honing head axial movement control signal enables the three-position four-way electromagnetic directional valve to be electrified at the left position, the two-way hydraulic lock right hydraulic control one-way valve is opened, a right oil port on a right working oil cavity of the double-acting hydraulic cylinder is filled with oil, the right working oil cavity is pressurized, the volume is increased, a piston is pushed to move leftwards, a left oil port on the left working oil cavity returns oil, the piston drives a piston rod and a honing body which is rigidly connected to the piston rod to move leftwards, the honing head is axially retracted, and the honing head is axially;

The honing head rotary motion oil path is characterized in that the two-position four-way electromagnetic reversing valve is in a right position in a normal state, when a honing head rotary motion control signal is electrified and the two-position four-way electromagnetic reversing valve works in a left position, the variable hydraulic motor converts pressure energy into rotary mechanical energy, and torque and rotating speed are transmitted to the honing body through the input transmission shaft to drive the honing head to rotate;

when the left position of the two-position three-way electromagnetic reversing valve in the oilstone radial expansion oil path works, the single-action cylinder oil port on the working oil cavity of the single-action hydraulic cylinder is filled with oil to push the push rod to move rightwards, the axial movement of the push rod is converted into the radial movement of the oilstone seat, the oilstone expands to convert the hydraulic pressure of the working oil cavity into the honing working pressure of the oilstone, otherwise, when the right position of the two-position three-way electromagnetic reversing valve works, the working oil cavity of the single-action hydraulic cylinder is decompressed, the oil cavity moves leftwards under the action of the push rod reset spring, the oils.

Compared with the prior art, the invention has the beneficial effects that:

the invention mainly depends on the hydraulic pressure of the hydraulic pump station as a power source, the hydraulic transmission is stable, the transmission ratio is large, the structure is simple, the control is convenient and the precision is high compared with the mechanical transmission, and simultaneously the straightness and the cylindricity of the cylinder hole during honing processing can be well ensured by utilizing the axial linear movement of the hydraulic cylinder, thereby being beneficial to improving the processing quality of the cylinder hole and the combustion efficiency of the internal combustion engine.

Drawings

FIG. 1 is a schematic structural diagram of a honing head for processing a cylinder hole of an internal combustion engine;

FIG. 2 is a schematic diagram of a honing head hydraulic control system for internal combustion engine cylinder bore processing according to the present invention;

FIG. 3 is a schematic structural view of a honing head double-acting hydraulic cylinder for processing a cylinder hole of an internal combustion engine according to the invention;

fig. 4 is a schematic structural view of a honing head single-action hydraulic cylinder for processing a cylinder hole of an internal combustion engine.

In the figure: 1-input transmission shaft, 2-cylinder body, 3-groove, 4-piston, 5-convex key, 6-piston rod, 7-sealing ring, 8-single-action hydraulic cylinder oil port, 9-oilstone seat, 10-expansion spring, 11-oilstone, 12-reset spring, 13-push rod, 14-honing body, 15-right oil port, 16-left oil port, 17-oil distribution disc, 18-bearing, 19-hydraulic pump station, 20-one-way valve, 21-energy accumulator, 22-honing head axial movement control signal, 23-honing head rotary movement control signal, 24-oilstone radial expansion control signal, 25-three-position four-way electromagnetic directional valve, 26-two-position four-way electromagnetic directional valve, 27-two-position three-way electromagnetic directional valve, 28-bidirectional hydraulic lock, 29-double-acting hydraulic cylinder, 30-variable hydraulic motor, 31-single-acting hydraulic cylinder and 32-oil tank.

Detailed Description

The technical solutions implemented by the present invention will be clearly and completely described below with reference to the accompanying 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 inventive step, are within the scope of the present invention.

As shown in fig. 1, a cylinder bore processing honing head of a hydraulic drive internal combustion engine includes an input transmission shaft 1, a double-acting hydraulic cylinder 29, a single-acting hydraulic cylinder 31, an oil distribution disc 17 and a support bearing 18.

As shown in fig. 3, the double-acting hydraulic cylinder 29 includes a cylinder body 2, an input transmission shaft 1 is rigidly connected with a left end cover of the cylinder body 2, a piston 4 in the cylinder body 2 divides the cylinder body 2 into a left working oil chamber and a right working oil chamber, a right oil port 15 penetrates through a right end cover of the double-acting hydraulic cylinder 29 to be connected with the right working oil chamber, a left oil port 16 penetrates through a left end cover of the double-acting hydraulic cylinder 29 to be connected with the left working oil chamber, a right end of the piston 4 is connected with one end of a piston rod 6, the piston rod 6 completes the sealing between the right end cover of the double-acting hydraulic cylinder 29 and the piston rod 6 through a sealing ring 7, 3 rectangular grooves 3;

as shown in fig. 4, the single-acting hydraulic cylinder 31 is composed of a honing body 14, a push rod 13, a return spring 12, an oilstone seat 9, a collapsible spring 10 and an oilstone 11, the honing body 14 is rigidly connected with the other end of the piston rod 6, the left end of the push rod 13 and the honing body 14 form a closed working oil chamber, a single-acting hydraulic cylinder oil port 8 penetrates through the left end cover of the single-acting hydraulic cylinder 31 to be connected with the working oil chamber, the return spring 12 is installed between the right end of the push rod 13 and the right end of the honing body 14, the oilstone 11 is installed on the oilstone seat 9 through the collapsible spring 10, the oilstone seat 9 is installed in oilstone seat grooves uniformly distributed in the circumferential direction of the cylinder body of the single-acting hydraulic cylinder 31, and two conical rotary surfaces on the outer circular surface of;

Join in marriage food tray 17 and support bearing 18 outer lane fixed connection together, respectively fixed mounting has the oil distribution groove on joining in marriage food tray on 29 left end covers of double-acting pneumatic cylinder, right-hand member lid and the 31 left end covers of single-acting pneumatic cylinder, join in marriage and form the rotatory friction pair between food tray 17 and the cylinder body end cover, can realize like this when the oil of business turn over, the rotary motion of cylinder body 2 and the axial motion of piston 4.

As shown in fig. 2, in the embodiment of the invention, a hydraulic circuit for processing a honing head in a cylinder hole of a hydraulically-driven internal combustion engine, a hydraulic pump station 19 provides pressure of working medium hydraulic oil in the hydraulic circuit, and an oil tank 32 stores the hydraulic oil and dissipates heat with the oil. According to the requirements of the honing process of the cylinder hole of the internal combustion engine, the honing hydraulic oil way comprises a honing head axial reciprocating motion oil way, a honing head rotary motion oil way and an oilstone radial expansion oil way, and the three oil ways work independently and do not interfere with each other.

Pressure oil of an oil way with the honing head axially reciprocating enters a one-way valve 20 through a hydraulic pump station 19, the one-way valve 20 mainly prevents backflow of the pressure oil of a working loop in the oil way, and an energy accumulator 21 can reduce pressure impact in the oil way and maintain the pressure stability of the system; the two-way hydraulic lock 28 between the three-position four-way electromagnetic directional valve 25 and the double-acting hydraulic cylinder 29 is formed by connecting 2 hydraulic control one-way valves in parallel, the pressure of the opposite oil way of each one-way valve is taken as pilot pressure, when the three-position four-way electromagnetic directional valve 25 is positioned in the middle position, the pilot pressures of the two one-way valves are equal, the one-way valves are closed, the acting forces of the left working oil cavity and the right working oil cavity of the double-acting hydraulic cylinder 29 are balanced, and the axial positions of the; when the honing head axially feeds, the honing head axial motion control signal 22 enables the right position of the three-position four-way electromagnetic directional valve 25 to be electrified, the left hydraulic control one-way valve of the two-way hydraulic lock 28 is opened, pressure oil is fed through the left oil distribution disc 17 of the double-acting hydraulic cylinder 29 and the 8 left oil ports 16 uniformly distributed on the left end cover of the double-acting hydraulic cylinder 29, the left working oil cavity is pressurized, the volume is increased, the piston 4 is pushed to move rightwards, oil in the right working oil cavity is returned through the right oil port 15 of the double-acting hydraulic cylinder 29 and the right oil distribution disc 17, and the piston 4 drives the piston rod 6 and the honing body 14 rigidly connected to the piston rod 6. When the axial motion control signal 22 of the honing head enables the left position of the three-position four-way electromagnetic directional valve 25 to be electrified, the right hydraulic control one-way valve of the two-way hydraulic lock 28 is opened, pressure oil enters through the right oil distribution disc 17 of the double-acting hydraulic cylinder 29 and the 8 right oil ports 15 uniformly distributed on the right end cover of the double-acting hydraulic cylinder 29, the right working oil cavity is pressurized, the volume is increased, the piston 4 is pushed to move leftwards, the left working oil cavity oil double-acting hydraulic cylinder 29 returns oil from the left oil port 16 and the left oil distribution disc 17, the piston 4 drives the piston rod 6 and the honing body 14 rigidly connected to the piston rod 6 to move leftwards, the axial retraction of;

When the honing head rotation movement control signal 23 is electrified and the two-position four-way electromagnetic directional valve 26 works at the left position, the variable hydraulic motor 30 converts pressure energy into rotary mechanical energy, torque and rotation speed are input through the input transmission shaft 1, the input transmission shaft 1 is rigidly connected with the cylinder body 2, 3 rectangular grooves are uniformly distributed on the inner circular surface of the cylinder body 2 and are tightly matched with 3 rectangular convex keys uniformly distributed on the outer circular surface of the piston 4, the piston 4 is rigidly connected with the piston rod 6 and the honing body 14, so that the torque and the rotation speed input by the variable hydraulic motor 30 are transmitted to the honing body 14 to drive the honing head to rotate, and the variable hydraulic motor 30 can realize the adjustment of output rotation speed;

when the left position of the two-position three-way electromagnetic directional valve 27 in the oilstone radial expansion oil path works, pressure oil enters through an oil distribution disc 17 on the single-action hydraulic cylinder 31 and 8 single-action hydraulic cylinder oil ports 8 evenly distributed on a left end cover of the single-action hydraulic cylinder 31, the push rod 13 is pushed to move right, axial movement of the push rod 13 is converted into radial movement of an oilstone seat 9, the oilstone 11 expands, hydraulic pressure of a working oil chamber is converted into honing working pressure of the oilstone 11, on the contrary, when the right position of the two-position three-way electromagnetic directional valve 27 works, oil in the working oil chamber of the single-action hydraulic cylinder 31 is decompressed through the single-action hydraulic cylinder oil ports 8 and the left end cover oil distribution disc 17, the oil is moved left under the action of a reset spring.

The standard elements used in the invention can be purchased from the market, the special-shaped pieces can be calculated, designed and customized according to the description of the specification and the description of the attached drawings, the specific connection mode of each part adopts conventional means such as mature bolts, rivets, welding and the like in the prior art, and the machines, the parts and equipment adopt the current latest technical standard.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.