WO2021097787A1

WO2021097787A1 - Hydraulic cylinder exhaust mechanism and hydraulic actuator of hydraulic parking lock

Info

Publication number: WO2021097787A1
Application number: PCT/CN2019/120137
Authority: WO
Inventors: 郑飞翔
Original assignee: 舍弗勒技术股份两合公司; 郑飞翔
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2021-05-27
Also published as: DE112019007910T5; CN114144601A

Abstract

A hydraulic cylinder exhaust mechanism, comprising: a ventilation connection port (20), which is provided on a housing (110) of a hydraulic cylinder and comprises a connection port chamber (21) in communication with a liquid chamber (111) of the housing (110); a seal ventilation component (30), which is accommodated in the connection port chamber (21); and a cover component (40), which is mounted to the ventilation connection port (20) and holds the seal ventilation component (30) in the connection port chamber (21). The cover component (40) is provided with exhaust holes (41), and the seal ventilation component (30) and/or the ventilation connection port (20) are provided with a gas communication passage (311) allowing the exhaust holes (41) to be in communication with the liquid chamber (111).

Description

Hydraulic actuator of hydraulic cylinder exhaust mechanism and hydraulic parking lock

Technical field

The present invention relates to a hydraulic cylinder, and particularly to a hydraulic cylinder exhaust mechanism and a hydraulic actuator mechanism of a hydraulic parking lock.

Background technique

In the hydraulic actuator of the hydraulic parking lock, an exhaust method is realized through the gap between the piston and the inner wall of the casing of the hydraulic actuator, and the air and the transmission oil are discharged through the gap. The piston will reciprocate in the casing. Due to the wear between the piston and the inner wall of the casing, the gap will become larger and larger, and then the transmission oil will leak too much to build pressure in the hydraulic cylinder.

Summary of the invention

The purpose of the present invention is to overcome or at least alleviate the above-mentioned shortcomings of the prior art, and to provide a hydraulic cylinder exhaust mechanism and hydraulic actuator of a hydraulic parking lock with stable and controllable exhaust and/or liquid leakage.

A hydraulic cylinder exhaust mechanism is provided, which includes:

A vent interface, which is arranged on the housing of the hydraulic cylinder and includes an interface cavity communicating with the liquid cavity of the housing;

A sealing vent member, which is accommodated in the interface cavity; and

A cover member that is mounted to the vent port and holds the sealed vent member in the port cavity,

Wherein, the cover member is provided with a vent hole, and the sealed vent member and/or the vent interface is provided with a gas communication channel that connects the vent hole with the liquid chamber.

In at least one embodiment, the vent port is integrally formed in the housing, and a vent hole is formed in the housing to connect the port cavity with the liquid cavity.

In at least one embodiment, the vent interface includes a bottom wall, the vent hole is formed in the bottom wall, and the bottom wall is provided for supporting the sealed vent member and is connected to the sealed vent member. One or more protrusions of the first gas passage are formed between the bottom walls.

In at least one embodiment, the constituent material of the sealing and ventilating member includes at least one of rubber, plastic, or plastic, and the sealing and ventilating member is formed as a bottomed cylindrical structure.

In at least one embodiment, the gas communication passage includes a plurality of vent grooves formed on the outer circumferential surface of the sealed vent member.

In at least one embodiment, the sealed venting member includes a metal skeleton.

In at least one embodiment, the cover member includes a supporting portion that supports the sealed venting member so that the sealed venting member is fixedly received in the interface cavity.

In at least one embodiment, the supporting portion includes a supporting column that abuts against the bottom wall of the sealed venting member, thereby forming a second gas passage between the sealed venting member and the cover member.

In at least one embodiment, the vent interface includes an external thread, the cover member includes an internal thread, and the cover member is threadedly connected to the vent interface.

A hydraulic actuator of a hydraulic parking lock is provided, which includes a hydraulic cylinder, the hydraulic cylinder includes a housing and a piston,

Wherein, the hydraulic actuator further includes the hydraulic cylinder exhaust mechanism according to the present invention.

As described above, the hydraulic cylinder exhaust mechanism of the present invention may include a vent port, a sealed vent member, and a cover member, the cover member holding the sealed vent member in the port cavity of the vent port. The sealing venting member and/or the venting interface are provided with a gas communication channel that communicates the exhaust hole of the cover member with the liquid cavity of the housing. The gas communication passage is formed on a component that is not worn, so that the size of the gas communication passage as the exhaust passage is stable, and the exhaust gas and/or liquid leakage are stable and controllable.

In particular, the gas communication passage may include a vent groove formed on the surface of the sealing vent member and/or the vent interface, so that a small vent groove can be processed easily and at low cost, thereby achieving stable and controllable exhaust.

Description of the drawings

Fig. 1 shows a cross-sectional view of a hydraulic actuator of a hydraulic parking lock according to an embodiment of the present invention.

Fig. 2 is a partial enlarged view of Fig. 1.

3A, 3B, and 3C show a perspective view of the components of a hydraulic cylinder exhaust mechanism according to an embodiment of the present invention, wherein FIG. 3A shows a perspective view of the cover member, and FIG. 3B shows a sealing vent member Figure 3C shows a perspective view of the structure near the vent interface.

List of reference signs

100 hydraulic cylinder, 110 housing, 111 liquid chamber, 112 vent, 113 liquid inlet and outlet, 120 piston, 200 solenoid valve, 210 lock pin,

20 vent port, 21 port cavity, 22 vent port bottom wall, 221 protrusion, 23 vent port peripheral wall,

30 sealing the venting member, 31 sealing the peripheral wall of the venting member, 311 the gas communication channel; 32 sealing the bottom wall of the venting member, 33 metal skeleton,

40 cover member, 41 vent hole, 42 support part, 43 bottom wall of cover member, 44 peripheral wall of cover member.

Detailed ways

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

First, referring to FIG. 1, a hydraulic actuator of a hydraulic parking lock according to an embodiment of the present invention will be introduced. The hydraulic actuator can be used to drive a pawl to achieve parking lock and release, for example.

1, the hydraulic actuator includes a hydraulic cylinder 100 and a solenoid valve 200. The hydraulic cylinder 100 includes a housing 110 and a piston 120. The piston 120 may be used to drive the pawl. The solenoid valve 200 can be used to drive the lock pin 210 to lock and release the position of the piston 120. A liquid (for example, hydraulic oil) inlet and outlet 113 is formed on the housing 110.

1 and 2, the hydraulic actuator further includes a hydraulic cylinder exhaust mechanism according to an embodiment of the present invention.

This hydraulic cylinder exhaust mechanism is used to exhaust the housing 110. Since liquid enters and exits the housing 110 during the operation of the piston 120, bubbles may be formed or entrained in the liquid, and the gas formed by the release of the bubbles may affect the operation of the hydraulic cylinder. Therefore, the gas needs to be discharged.

1 to 3C, the hydraulic cylinder exhaust mechanism includes: a vent interface 20, which is provided in the housing 110 of the hydraulic cylinder and includes an interface cavity 21 communicating with the liquid cavity 111 of the housing 110; a sealing vent member 30, which Contained in the interface cavity 21; and a cover member 40, which is mounted to the vent interface 20 and holds the sealed vent member 30 in the interface cavity 21. The cover member 40 is provided with a vent 41, and the sealing vent member 30 and/or the vent interface 20 is provided with a gas communication channel 311 that connects the vent 41 with the liquid chamber 111.

In the present invention, the vent interface 20 may be integrally formed in the housing 110. The housing 110 may be formed of, for example, plastic, so that the vent interface 20 can be easily integrally formed on the housing 110. Of course, the material of the housing 110 is not limited to plastic. For example, the housing 110 may also be made of metal or include metal. It should be understood that the metal in the present invention includes metal alloys. In another example, the vent interface 20 may be installed to the housing 110 by means of interference fit or threaded connection.

A vent hole 112 connecting the interface cavity 21 and the liquid cavity 111 may be formed in the housing 110. The vent interface 20 and the vent hole 112 are preferably formed in the upper part of the housing 110.

The vent interface 20 may include a bottom wall 22, and the bottom wall 22 may be a part of the wall of the housing 110, and the above-mentioned vent hole 112 may be formed in the bottom wall 22. Preferably, the bottom wall 22 is provided with one or more protrusions 221 for supporting the sealing venting member 30 and forming a first gas passage (gap) between the sealing venting member 30 and the bottom wall 22. In the case of a plurality of protrusions 221, the plurality of protrusions 221 may be dispersedly arranged on the bottom wall 22. In the case of a protrusion, the protrusion may have a strip shape or an arc shape. The first gas passage connects the vent hole 112 with the gas communication passage 311.

The ventilation interface 20 may further include a peripheral wall 23 protruding from the bottom wall 22 to the outside of the housing 110. Therefore, the vent interface 20 may have a bottomed cylindrical structure, especially a cylindrical structure. An external thread may be formed on the peripheral wall 23 of the vent port 20, and the cover member 40 may include an internal thread, so that the cover member 40 may be screwed to the vent port 20. The detachable connection of the cover member 40 and the vent interface 20 is simple and reliable to realize and easy to maintain.

In a non-limiting example, the above-mentioned gas communication channel 311 may include one or more vent grooves formed on the inner peripheral surface of the peripheral wall 23.

The material of the sealing and venting member 30 may include at least one of soft materials such as rubber, plastic, or plastic, and in particular, may include rubber. The air-sealing member 30 may further include a metal skeleton 33 buried in, for example, rubber, so as to maintain the overall shape of the air-sealing member 30. A soft material such as rubber can easily ensure the formation of the gas communication passage 311 and the first gas passage, and can easily ensure that the gas communication passage 311 and the first gas passage have a desired small size.

The sealing vent member 30 may be formed as a bottomed cylindrical structure, that is, the sealing vent member 30 includes a bottom wall 32 and a peripheral wall 31. The bottom wall 32 may be in contact with the bottom wall 22 of the vent port 20 (especially, with the protrusion 221). The peripheral wall 31 can be an interference fit with the inner peripheral surface of the peripheral wall 23 of the vent port 20.

The gas communication passage 311 may include a plurality of vent grooves formed on the outer peripheral surface of the peripheral wall 31 of the sealing vent member 30. A plurality of vent grooves may extend along the axial direction of the sealed vent member 30 and be arranged at intervals in the circumferential direction of the sealed vent member 30. A plurality of vent grooves are arranged at intervals along the circumferential direction of the sealing vent member 30 to realize flow restriction and diversion, slow down the flow rate of the liquid, and reduce the amount of liquid leakage.

The constituent material of the cover member 40 may include metal and/or plastic or the like.

The cover member 40 may include a bottom wall 43 and a peripheral wall 44 on which the above-mentioned internal thread is formed. The cover member 40 may further include a support portion 42 protruding from the bottom wall 43. The support portion 42 supports the sealing vent member 30 so that the position of the sealing vent member 30 is kept fixedly received in the interface cavity 21. In the illustrated example, the support portion 42 includes a support column that abuts the bottom wall 32 of the sealing vent member 30 to form a second gas passage between the sealing vent member 30 and the cover member 40. More specifically, the support column makes it possible to form a second gas passage (gap) between the end surface of the peripheral wall 31 of the sealing venting member 30 and the inner surface of the bottom wall 43 of the cover member 40, and the second gas passage allows the exhaust hole 41 to be formed. It communicates with the gas communication channel 311. The above-mentioned exhaust holes 41 may be a plurality of exhaust holes scattered around the support column.

It can be understood that the exhaust gas should not affect the establishment of hydraulic pressure in the hydraulic cylinder. Therefore, the exhaust volume needs to be accurately controlled, that is, the size of the exhaust passage needs to be accurately controlled. In the present invention, by providing a gas communication passage 311 for communicating the exhaust hole 41 with the liquid chamber 111 in the sealing vent member 30 and/or the vent port 20, the gas communication as a part of the exhaust passage can be controlled accurately and at low cost. The size of the passage 311 can then precisely control the exhaust volume.

For example, in the case where only the cover member 40 is provided without the sealing vent member 30, it is necessary to precisely control the size (for example, the aperture) of the vent hole 41 on the cover member 40 and the vent hole 112 on the housing 110, in order to achieve Smaller exhaust volume, the hole diameter needs to be small, which is difficult to process, or the processing cost is high. In the present invention, the gas communication channel 311 can be formed on the sealing vent member 30 and/or the vent interface 20, which makes it possible to easily and cost-effectively form the gas communication channel 311 with a smaller size, especially in the sealing vent member 30 When a vent groove (rather than a vent hole) is formed on the outer peripheral surface of the vent port 20 and/or the inner peripheral surface of the vent port 20.

As a non-limiting example, the gas communication channel 311 may be formed by cutting or laser ablation. In an exemplary but non-limiting example, the diameter or width or height of the ventilation groove of the outer peripheral surface of the sealing ventilation member 30 may be less than 1 mm.

Different aeration slot sizes will lead to different exhaust volumes, so the exhaust volume and liquid leakage can be precisely controlled by adjusting the geometry or size of the aeration slots. In addition, there is no wear in the hydraulic cylinder exhaust mechanism of the present invention, and therefore, the exhaust volume and leakage are stable.

It can be understood that the main purpose of the hydraulic cylinder exhaust mechanism of the present invention is to exhaust, but there is inevitably liquid leakage (or liquid leakage) during exhaust. Therefore, the present invention does not exclude liquid leakage while exhausting. On the other hand, the present invention does not exclude the use of air-permeable and liquid-impermeable materials and/or components to substantially reduce or limit liquid leakage.

It should be understood that although the hydraulic cylinder exhaust mechanism of the present invention is described in the hydraulic actuator engaged with the hydraulic parking lock in the present invention, the hydraulic cylinder exhaust mechanism of the present invention is not limited to the hydraulic actuator used for the hydraulic parking lock. Rather, it can be used in any other occasions where it is necessary to hold the pressure of the hydraulic cylinder or the liquid container while venting.

Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can make various modifications to the above-mentioned embodiments of the present invention under the teaching of the present invention without departing from the scope of the present invention.

Claims

A hydraulic cylinder exhaust mechanism, which includes:

Ventilation interface (20), which is arranged on the housing (110) of the hydraulic cylinder and includes an interface cavity (21) communicating with the liquid cavity (111) of the housing (110);

A sealing vent member (30), which is accommodated in the interface cavity (21); and

A cover member (40), which is installed to the vent interface (20) and holds the sealed vent member (30) in the interface cavity (21),

Wherein, the cover member (40) is provided with a vent hole (41), the sealed vent member (30) and/or the vent interface (20) is provided with the vent hole (41) and the A gas communication channel (311) communicated with the liquid chamber (111).
The hydraulic cylinder exhaust mechanism according to claim 1, wherein the ventilation interface (20) is integrally formed in the housing (110), and the housing (110) is formed with the interface cavity (21) A vent (112) communicating with the liquid chamber (111).
The hydraulic cylinder exhaust mechanism according to claim 2, wherein the vent interface (20) includes a bottom wall (22), the vent hole (112) is formed in the bottom wall (22), and the vent hole (112) is formed in the bottom wall (22). The bottom wall (22) is provided with one or more protrusions for supporting the sealed ventilation member (30) to form a first gas passage between the sealed ventilation member (30) and the bottom wall (22) (221).
The hydraulic cylinder exhaust mechanism according to any one of claims 1 to 3, wherein the constituent material of the sealed ventilation member (30) includes at least one of rubber, plastic or plastic, and the sealed ventilation member ( 30) It is formed into a cylindrical structure with a bottom.
The hydraulic cylinder exhaust mechanism according to claim 4, wherein the gas communication passage (311) includes a plurality of vent grooves formed on the outer peripheral surface of the sealed venting member (30).
The hydraulic cylinder exhaust mechanism according to claim 4 or 5, wherein the sealed ventilation member (30) comprises a metal skeleton (33).
The hydraulic cylinder exhaust mechanism according to any one of claims 1 to 6, wherein the cover member (40) includes a support portion (42), and the support portion (42) supports the sealed ventilation member (30). ) To keep the sealed ventilation member (30) fixedly housed in the interface cavity (21).
The hydraulic cylinder exhaust mechanism according to claim 7, wherein the supporting portion (42) comprises a supporting column, and the supporting column abuts against the bottom wall (32) of the sealed venting member (30) so as to A second gas passage is formed between the sealing vent member (30) and the cover member (40).
The hydraulic cylinder exhaust mechanism according to any one of claims 1 to 8, wherein the vent interface (20) includes an external thread, the cover member (40) includes an internal thread, and the cover member (40) It is screwed to the vent port (20).
A hydraulic actuator for a hydraulic parking lock includes a hydraulic cylinder (100), the hydraulic cylinder (100) includes a housing (110) and a piston (120),

Wherein, the hydraulic actuator further comprises the hydraulic cylinder exhaust mechanism according to any one of claims 1-9.