CN212643201U - Exhaust structure of clutch power cylinder and clutch power cylinder - Google Patents

Abstract

The utility model relates to an exhaust structure and clutch helping hand jar of clutch helping hand jar. The exhaust structure includes an exhaust port, on which a check structure is installed, the check structure including an elastic sealing gasket and a rigid bracket provided at a side of the elastic sealing gasket facing the inside of the exhaust port to support the elastic sealing gasket, the rigid bracket having a gas exhaust passage, the elastic sealing gasket closing the exhaust port when a gas pressure in the clutch assist cylinder is lower than a predetermined value, and allowing gas to be exhausted in an exhaust direction when the gas pressure in the clutch assist cylinder exceeds the predetermined value. According to the utility model discloses, can improve the sealing performance of clutch power cylinder's exhaust structure, prevent more reliably that foreign matter such as the outside rainwater of coming from the gas vent, earth from getting into clutch power cylinder.

Description

Exhaust structure of clutch power cylinder and clutch power cylinder

Technical Field

The present invention relates to a clutch cylinder and an exhaust structure of a clutch cylinder used in the fields of control, transmission, and the like of vehicles such as heavy trucks, dump trucks, and the like.

Background

Clutch cylinders are widely used in the fields of control, transmission, and the like of vehicles such as heavy trucks and dump trucks. Currently, riveted flat rubber gaskets are typically used at the exhaust port of the clutch cylinder to "seal" the exhaust port to prevent foreign matter from outside the exhaust port from entering the clutch cylinder.

However, under severe conditions such as when the vehicle travels over a construction site, a muddy road, a puddle, etc., the conventional vent structure cannot effectively prevent foreign substances such as rainwater, mud, etc. from entering the clutch cylinder, and thus the clutch cylinder may be damaged by the entering foreign substances and have a reduced service life.

SUMMERY OF THE UTILITY MODEL

After studying the problem that the sealing performance of the exhaust port of the conventional clutch cylinder is not good, the inventor finds that an important reason is that the currently-adopted planar rubber gasket is recessed inwards under the action of external pressure (namely, backpressure), so that the rubber gasket does not seal the exhaust port any more, and further, foreign matters outside the exhaust port enter the clutch cylinder.

In view of this, the inventors conceived to more reliably prevent foreign matter from outside the exhaust port from entering the clutch cylinder by enhancing the resistance of the seal gasket against the external pressure.

According to the utility model discloses an aspect provides a clutch power cylinder's exhaust structure, a serial communication port, exhaust structure includes the gas vent, the non return structure is installed to the gas vent, the non return structure includes elastic sealing gasket and rigid support, the rigid support sets up in elastic sealing gasket's one side department towards the gas vent is inside for support elastic sealing gasket, the rigid support has gas discharge passage, and when gas pressure in clutch power cylinder is less than a predetermined value elastic sealing gasket seals the gas vent, and gas pressure in clutch power cylinder surpasses allow along exhaust direction exhaust gas during the predetermined value. The elastic sealing gasket is configured to be able to take a sealing position for sealing the exhaust port when not exhausting, and a exhausting position for allowing exhausting in an exhausting direction when exhausting. The rigid support strengthens the resistance of the elastic sealing gasket to the external pressure, prevents the elastic sealing gasket from inwards sinking under the action of the external pressure so that the periphery of the elastic sealing gasket can not seal the exhaust port any more, and can improve the reliability of the elastic sealing gasket for sealing the exhaust port.

According to a preferred aspect, the peripheral edge of the elastic sealing gasket is provided with a seal-reinforcing structure capable of abutting against an abutment provided on the inner wall of the exhaust port. The sealing reinforcing structure can enable the elastic sealing gasket to be more reliably abutted against the inner wall of the exhaust port, so that the sealing of the elastic sealing gasket to the exhaust port is enhanced.

According to a preferred aspect, the seal-reinforcing structure is a triangular projection or a circular enlargement thicker with respect to the rest of the elastic sealing gasket, said abutment being configured perpendicularly or obliquely with respect to the venting direction of the vent. Compare with flat elastic sealing gasket, the elastic sealing gasket that sets up this kind of thickening seals the enhancement structure and locates non-deformable in the position department at sealed enhancement structure place, can strengthen the reliability of elastic sealing gasket sealed gas vent from this. Further, the contact area between the elastic seal gasket and the exhaust port is increased by the contact between the circular enlarged portion and the abutting portion in the surface contact manner, as compared with the case where the triangular projecting portion and the abutting portion are in substantially line contact, thereby further enhancing the sealing of the elastic seal gasket against the exhaust port.

According to a preferred aspect, a biasing structure disposed on a downstream side of the elastic sealing gasket in the exhaust direction is further provided inside the exhaust port, the biasing structure being configured to apply a biasing force to the elastic sealing gasket in a direction opposite to the exhaust direction, the biasing force biasing the elastic sealing gasket toward the rigid support. The biasing structure applies a biasing force to compress the resilient sealing gasket, thereby more reliably ensuring that the resilient sealing gasket is in a sealing position sealing the exhaust port when the gas pressure within the clutch assist cylinder is below a predetermined value.

According to a preferred aspect, the biasing arrangement comprises a spring in a pre-compressed state, and when the gas pressure in the clutch cylinder exceeds a predetermined value, the exhaust gas pressure pushes open the resilient sealing gasket against the biasing force of said spring, deforming the resilient sealing gasket and switching to an exhaust position allowing exhaust gas to take place.

According to a preferred aspect, the inner wall of the exhaust port is provided with a circumferential groove, and the biasing structure is mounted in the exhaust port by means of a retainer snap-fitted into the circumferential groove. Thus, the biasing structure can be conveniently fitted into the exhaust port of the clutch assist cylinder to bias various types of elastic sealing gaskets.

According to a preferred aspect, a first through hole is provided in the side wall of the gas outlet, the first through hole being arranged upstream of the check structure in the gas outlet direction and communicating to a bypass gas chamber located outside the gas outlet to cause a part of the gas to be discharged to flow to the bypass gas chamber via the first through hole, and a pressure reducing member aligned with the first through hole is further provided inside the gas outlet to reduce the pressure of the gas flowing to the bypass gas chamber via the first through hole. The flow of a portion of the gas to be discharged to the bypass plenum forms what is called internal breathing compensation. The gas flowing to the bypass gas chamber is prevented from having an excessive pressure to impact a component in the bypass gas chamber, as compared with the case where the pressure reducing member is not provided.

According to a preferred aspect, the pressure reducing member includes a cylindrical portion as a main body portion, a channel is provided around an outer circumferential wall of the cylindrical portion, and a second through hole is further provided through a side wall of the cylindrical portion, the second through hole being configured to be away from each other in a radial direction of the exhaust port with the first through hole in an attached state of the pressure reducing member. The pressure reducing component has simple structure and small size, and can be conveniently assembled in various exhaust structures of the clutch boosting cylinder.

According to a preferred aspect, the hollow interior of the cylindrical portion of the pressure reducing member forms a primary vent path to the non-return structure, and the second through-hole of the cylindrical portion of the pressure reducing member, the channel around the outer peripheral wall of the cylindrical portion, and the first through-hole of the vent port together form a secondary bypass path (i.e., an internal breathing compensation path) to the bypass plenum.

According to a second aspect of the present invention, there is provided a clutch cylinder, characterized in that the clutch cylinder comprises an exhaust structure according to any one of the preceding aspects.

Drawings

The present invention will now be described in detail hereinafter with reference to the accompanying drawings. It is to be understood that the drawings are not necessarily to scale and that the drawings are merely illustrative of exemplary embodiments of the invention and are not to be considered limiting of its scope. In the drawings:

FIG. 1 is a perspective view of a clutch cylinder 10 with an exhaust structure 100 installed;

fig. 2 is a perspective view of an exhaust structure 100 of a clutch cylinder according to a first embodiment of the present invention;

fig. 3 is a partial cross-sectional enlarged view of the exhaust port 110 of the exhaust structure 100 according to the first embodiment;

FIG. 4 is an enlarged, partial cross-sectional view of the vent 110 prior to installation of the check structure 120 according to the first embodiment;

fig. 5 is a cross-sectional view of the elastic sealing gasket 121 of the non-return structure 120 according to the first embodiment;

FIG. 6 is a perspective view of the rigid carrier 124 of the check structure 120 according to the first embodiment;

fig. 7 is an enlarged partial sectional view of an exhaust port 210 of an exhaust structure of a clutch cylinder according to a second embodiment of the present invention;

FIG. 8 is an enlarged, partial cross-sectional view of the vent 210 according to the second embodiment, prior to installation of the check structure 220;

fig. 9 is a cross-sectional view of the elastic sealing gasket 221 of the check structure 220 according to the second embodiment;

fig. 10 is a perspective view of an exhaust structure 300 of a clutch cylinder according to a third embodiment of the present invention;

fig. 11 is a partial cross-sectional enlarged view of the exhaust port 310 of the exhaust structure 300 according to the third embodiment;

FIG. 12 is an enlarged partial cross-sectional view of the vent 310 prior to installation of the check structure 320 and the biasing structure 330 in accordance with the third embodiment;

fig. 13 is an enlarged partial sectional view of an exhaust port 410 of an exhaust structure of a clutch cylinder according to a fourth embodiment of the present invention;

fig. 14 is a perspective view of a pressure-reducing member 440 according to a fourth embodiment; and

fig. 15 is a sectional view of a decompression member 440 according to the fourth embodiment.

Detailed Description

Exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the description of the various embodiments is illustrative only and is not intended to limit the technology of the present invention in any way. It should also be understood that components described with reference to one embodiment can also be used in other embodiments. The embodiments disclosed herein can be combined in various ways to provide further additional embodiments.

It should be understood that like reference numerals refer to like elements throughout the several views. In the first to fourth embodiments, the reference numerals of the corresponding parts are generally increased by "100" in order. In the drawings, the size of some of the elements may be modified, enlarged or reduced for clarity.

Unless otherwise defined, all terms used in the specification have the meanings commonly understood by those skilled in the art. Well-known functions or constructions may not be described in detail for brevity and/or clarity.

As used in this specification, the singular forms "a", "an", and "the" may include the plural forms as well, unless expressly stated otherwise. The terms "comprising," "including," and "containing" when used in this specification specify the presence of stated features, but do not preclude the presence or addition of one or more other features. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.

In the description, when an element is referred to as being "on," "attached" to, "connected" or "coupled" to, or "contacting" another element, etc., another element may be directly on, attached to, connected or coupled to, or contacting the other element, or intervening elements may be present.

A number of exemplary embodiments of the exhaust structure of the clutch cylinder 10 according to the present invention will now be described in detail with reference to fig. 1 to 15.

< first embodiment >

First, an exhaust structure 100 of a clutch cylinder 10 according to a first embodiment of the present invention will be described with reference to fig. 1 to 6. As shown in fig. 1, the clutch cylinder 10 is provided with an exhaust structure 100. As shown in fig. 2-4, the venting structure 100 is provided with a vent 110 and a check structure 120 can be mounted to the vent 110. Here, the "check structure" refers to a structure configured to allow gas inside the clutch cylinder to be discharged but isolate foreign substances outside the gas discharge port from entering the clutch cylinder, and such a definition is applied to the entire text. In fig. 2, 3, the check structure 120 has been installed to the exhaust port 110, while in fig. 4, the check structure 120 has not been installed to the exhaust port 110.

The non-return structure 120 according to this embodiment is provided with an elastic sealing gasket 121 and a rigid support 124. Here, the "elastic sealing gasket" refers to a flat-type gasket or a substantially flat-type gasket that is elastically deformable, that closes the exhaust port when the gas pressure in the clutch cylinder is lower than a predetermined value (i.e., that assumes a sealing position that seals the exhaust port when not exhausting), and that allows gas to be exhausted in the exhaust direction when the gas pressure in the clutch cylinder exceeds the predetermined value (i.e., that assumes an exhaust position that allows exhaust when exhausting), and the "sealing performance" of the elastic sealing gasket refers to the performance of the elastic sealing gasket to seal the exhaust port, particularly, the gas exhaust passage that seals the rigid bracket, when the gas pressure in the clutch cylinder is lower than the predetermined value, and such a definition applies to the entire text. Preferably, the elastic sealing gasket 121 may be a circular rubber gasket.

The rigid bracket 124 is provided at a side of the elastic sealing gasket 121 facing the inside of the exhaust port 110 for supporting the elastic sealing gasket 121, while the rigid bracket 124 does not interfere with the exhaust of the gas in the clutch cylinder. The rigid support 124 may comprise at least one gas discharge channel 125, for example three hollowed-outs (as shown in fig. 6) uniformly arranged in the circumferential direction, to allow the passage of the gas to be discharged. The rigid support 124 enhances the resistance of the elastic sealing gasket 121 to the external pressure, and prevents the elastic sealing gasket 121 from being recessed inwards under the action of the external pressure, so that the periphery of the elastic sealing gasket 121 no longer seals the exhaust port 110, and further, foreign matters outside the exhaust port enter the clutch booster cylinder. Preferably, the rigid support 124 may be a circular metal support. However, the rigid support 124 for supporting the elastic sealing gasket 121 while allowing the passage of gas is not limited thereto. For example, one skilled in the art may envision the rigid support 124 as a rigid grid, a rigid metal mesh, or the like.

The peripheral edge of the elastic sealing gasket 121 may abut against an abutting portion 113 provided on the inner wall of the exhaust port 110. The exhaust port 110 includes a first hollow portion 111 having a first inner diameter and a second hollow portion 112 having a second inner diameter, which is greater than the first inner diameter. Further, the second hollowness 112 is located downstream of the first hollowness 111 in the exhaust direction F (shown in fig. 3). The abutment portion 113 is formed at the transition portion between the first hollow portion 111 and the second hollow portion 112, and the outermost peripheral edge of the elastic seal gasket 121 abuts against the abutment portion 113.

Preferably, but not necessarily, the periphery of the elastic sealing gasket 121 may also be provided with a seal-enhancing structure that further enhances the sealing of the elastic sealing gasket against the exhaust port by enhancing the abutment between the elastic sealing gasket 121 and the abutment portion 113. The seal-enhancing structure may be a thicker and thus less deformable structure relative to the remainder of the elastic sealing gasket. In this embodiment, the seal-enhancing structure is a triangular projection 122 located at the periphery of the elastic sealing gasket 121, which projects towards the abutment 113. The triangular projections 122 will "grab" more strongly against the abutment 113, thereby also enhancing the sealing of the resilient sealing gasket 121 against the gas outlet 110. In the present embodiment, the abutment portion 113 is configured to be perpendicular to the exhaust direction F (i.e., the axial direction of the exhaust port).

In this embodiment, the resilient sealing gasket 121 and the rigid support 124 may be centrally secured to corresponding structures of the exhaust port 110. As shown in fig. 4, the exhaust port 110 may be provided with a central shaft 114, and the central shaft 114 may be provided with an axial hole 115 (e.g., a pin hole or a screw hole, etc.). As shown in fig. 5, the elastic sealing gasket 121 may be provided at the center with a mounting hole 123. Similarly, the rigid bracket 124 may be provided with a mounting hole 126 at the center. As shown in fig. 3, the mutually aligned elastic sealing gasket 121 and the rigid support 124 can be fixed to the vent 110, together with the cover 127, by means of fastening means 128 (for example, pins or screws, etc.) inserted through them into the axial hole 115 of the central shaft 114. However, the mounting structure for mounting the elastic sealing gasket 121 and the rigid bracket 124 to the exhaust port 110 is not limited thereto.

According to the check structure 120 of the present embodiment, the rigid support 124 supporting the elastic sealing gasket 121 can reliably prevent the elastic sealing gasket 121 from sinking inwards, thereby improving the reliability of the elastic sealing gasket 121 sealing the exhaust port 110. The optional triangular protrusion 122 (i.e., seal enhancing structure) further enhances the sealing of the resilient sealing gasket 121 against the vent 110.

< second embodiment >

Next, an exhaust structure of a clutch cylinder according to a second embodiment of the present invention will be described with reference to fig. 7 to 9. The air discharge structure of the clutch assist cylinder of the second embodiment is identical in appearance to that of the first embodiment. In fact, the second embodiment is a further improvement of the seal reinforcing structure of the elastic seal gasket in the check structure of the first embodiment, and the abutment portion of the exhaust port that abuts against the seal reinforcing structure of the elastic seal gasket. Therefore, for the sake of brevity, only the differences with respect to the first embodiment will be described in the present embodiment, and illustration and description of the same parts will be omitted.

The non-return structure 220 according to this embodiment is provided with a resilient sealing gasket 221 and a rigid support 224, as shown in fig. 7. Instead of the triangular protrusion, the elastic sealing gasket 221 may be provided at its outermost periphery with a circular enlargement 222 that is thicker relative to the rest of the elastic sealing gasket 221 as a seal reinforcement structure, as shown in fig. 9. Further, as shown in fig. 8, the abutting portion 213 between the first hollow portion 211 and the second hollow portion 212 of the exhaust port 210 may be configured to be inclined with respect to the exhaust direction F of the exhaust port 210. In the present embodiment, the circular enlarged portion 222 and the abutting portion 213 abut each other in a surface contact manner. In contrast, in the first embodiment, the triangular protruding portion 122 and the abutting portion 113 will abut in a line contact manner. Thus, the present embodiment increases the contact area between the elastic sealing gasket 221 and the gas outlet 210, thereby further enhancing the sealing of the elastic sealing gasket 221 to the gas outlet 210.

The check structure 220 according to the present embodiment can more reliably seal the exhaust port to prevent foreign matter from outside the exhaust port from entering the clutch cylinder, as compared to the first embodiment.

< third embodiment >

Next, an exhaust structure 300 of a clutch cylinder according to a third embodiment of the present invention will be described with reference to fig. 10 to 12. As shown in fig. 10 to 12, the exhaust structure 300 is provided with an exhaust port 310, and a check structure 320 configured to allow gas inside the clutch cylinder to be exhausted but prevent foreign materials outside the exhaust port from entering the clutch cylinder can be mounted to the exhaust port 310. The non-return structure 320 comprises an elastic sealing gasket 321 and a rigid support 324. Unlike the first and second embodiments, in the present embodiment, a biasing structure 330 is further provided downstream of the check structure 320 in the exhaust direction F of the exhaust port 310. The two dashed boxes in fig. 11 generally outline the check structure 320 and the biasing structure 330, respectively, of this embodiment. In fig. 10, 11, the check structure 320 and the biasing structure 330 have been installed to the vent 310, while in fig. 12 the check structure 320 and the biasing structure 330 have not been installed to the vent 310.

As described above, even when the gas pressure in the clutch cylinder is lower than a predetermined value, the elastic seal gasket may not be in contact with the contact portion of the exhaust port due to disturbance such as external pressure, and the exhaust port may not be sealed. In order to further improve the reliability of the elastic sealing gasket in sealing the exhaust port, the inventors conceived of applying a certain pressure from the side of the elastic sealing gasket facing the outside of the exhaust port to press the elastic sealing gasket against the rigid bracket, thereby more reliably ensuring that the elastic sealing gasket is in a sealing position for sealing the exhaust port when the gas pressure in the clutch cylinder is lower than a predetermined value.

In this embodiment, a biasing structure 330 is provided on the downstream side of the elastic sealing gasket 321 of the check structure 320 in the exhaust direction F. The biasing structure 330 applies a uniform biasing force to the resilient sealing gasket 321 along the outer periphery of the resilient sealing gasket 321 to compress the resilient sealing gasket 321 to bias the resilient sealing gasket 321 in the sealing position. When the gas pressure in the clutch cylinder exceeds a predetermined value, the exhaust gas pressure will blow the resilient sealing gasket 321 in the exhaust direction against the biasing force of the biasing structure 330, such that the resilient sealing gasket 321 is in an exhaust position allowing exhaust to take place.

Preferably, the biasing structure 330 may include a spring 331 in a pre-compressed state. The biasing structure 330 may also be provided with a hollow sleeve 332, with the spring 331 being received within the sleeve 332. The end of the spring 331 remote from the elastic sealing gasket 321 is fixedly clamped within the sleeve, while the end of the spring 331 close to the elastic sealing gasket 321 is movable in the axial direction of the sleeve under the action of the exhaust pressure. An annular washer 333 may be further provided between the spring 331 and the elastic sealing gasket 321, and the biasing force of the spring 331 may be transmitted to the elastic sealing gasket 321 via the annular washer 333 in a more uniform manner.

In this embodiment, the elastic sealing gasket 321 and the rigid support 324 supporting the elastic sealing gasket 321 at a side of the elastic sealing gasket 321 facing the inside of the exhaust port 310 are slightly different from those of the first and second embodiments. Specifically, the rigid support 324 is embedded in the elastic sealing gasket 321. An opening 322 is provided at the middle portion of the elastic sealing gasket 321, and the periphery of the elastic sealing gasket 321 is closely abutted against the inner wall of the exhaust port 310. Further, the rigid support 324 is provided with a gas discharge passage 325 at a portion near the periphery. When the gas pressure in the clutch cylinder is lower than a predetermined value, the biasing force of the spring 331 biases the elastic sealing gasket 321 in the sealing direction opposite to the exhaust direction F, so that the elastic sealing gasket 321 tightly blocks the gas exhaust passage 325 of the rigid bracket 324, and thus the elastic sealing gasket 321 is in the sealing position sealing the exhaust port 310. Conversely, when the gas pressure inside the clutch cylinder exceeds a predetermined value, the exhaust gas pressure flushes the elastic sealing gasket 321 in the exhaust direction against the biasing force of the spring 331, so that the elastic sealing gasket 321 no longer blocks the gas exhaust channel 325 of the rigid carrier 324 and the opening 322 of the elastic sealing gasket 321 communicates with the gas exhaust channel 325 of the rigid carrier 324, so that the elastic sealing gasket 321 is in the exhaust position allowing the exhaust to take place.

Unlike the first and second embodiments, as shown in fig. 12, the exhaust port 310 according to the present embodiment is not provided with a central shaft and an axial hole inside, but is provided with a circumferential groove 312 and an abutment 313 on an inner wall of a hollow cavity 311 of the exhaust port 310. In addition, the vent 310 is also suitably elongated so as to have sufficient space to accommodate the check structure 320 and the biasing structure 330. Preferably, but not necessarily, the check structure 320 may further be provided with a base 326, and an opening allowing the passage of the discharged gas is provided at the middle of the base 326. The check structure 320 may abut against the abutment 313 via the seat 326, the biasing structure 330 in turn being arranged next to the check structure 320. The retainer 314 can fit into the circumferential groove 312, thereby capturing the entire check structure 320 and biasing structure 330 within the hollow cavity 311 of the vent 310, as shown in FIG. 11. Preferably, the retainer 314 may be a circlip and the circumferential groove 312 may be a circlip groove. However, the retaining structure for retaining the check structure 320 and the biasing structure 330 within the vent 310 is not limited to the circlip and the circlip groove. For example, one skilled in the art may contemplate providing a through-hole in the sidewall of the vent 310 through which a bolt extends to retain the check structure 320 and biasing structure 330 within the vent 310.

In general, the biasing structure 330 of this embodiment is simple in structure and small in size, and can be easily assembled into the exhaust port of the clutch cylinder to bias various types of elastic sealing gaskets.

The biasing structure 330 of the present embodiment improves the sealing performance of the elastic sealing gasket 321, and more reliably prevents foreign matter such as rain water and mud from entering the clutch cylinder from the outside of the exhaust port 310, as compared with the first and second embodiments.

In addition, the clutch cylinder according to the present embodiment can also obtain the advantageous effects that the clutch cylinder according to the first and second embodiments can obtain, that is: the check structure 320 including the rigid bracket 324 improves the sealing performance of the elastic sealing gasket 321 for sealing the exhaust port, and more reliably prevents foreign materials such as rain water and mud from entering the clutch cylinder from the outside of the exhaust port 410.

< fourth embodiment >

Next, an exhaust structure of a clutch cylinder according to a fourth embodiment of the present invention will be described with reference to fig. 13 to 15. The fourth embodiment is a further improvement of the exhaust structure of the clutch assist cylinder of the foregoing embodiment (exemplified as the third embodiment in the drawings). Therefore, for the sake of brevity, only the differences with respect to the third embodiment will be described in the present embodiment, and illustration and description of the same parts will be omitted.

In each of the embodiments described herein, a radial through hole (i.e., a first through hole) is provided in a sidewall of the hollow cavity of the exhaust port. For example, as shown in fig. 13 of the fourth embodiment, the first through hole 416 is provided in the sidewall of the hollow cavity 411 of the air outlet 410. Although the first through hole is not specifically described in the first to third embodiments, it can be seen in the drawings of the first to third embodiments. The first through hole is arranged upstream of the check structure in the exhaust direction F. Further, the first through hole will communicate to a bypass plenum (not shown) located outside the exhaust port. The bypass plenum may be provided with a dust shield such as a bellows. When the gas pressure in the clutch cylinder is greater than a predetermined value, a large part of the gas to be discharged will be discharged in the discharge direction F through the non-return structure, while a part of the gas will also be compensated (also referred to as inner breath compensation) to the bypass gas chamber via the first through hole of the discharge opening. In the first to third embodiments, the gas for internal respiration compensation is compensated to the bypass gas chamber directly via the first through hole. However, in the case where the discharge pressure is too large, the gas compensated to the bypass plenum is likely to cause damage to components at the bypass plenum, such as breaking a dust boot downstream. To address this issue without impeding the discharge of gas from the exhaust port and without reducing the amount of gas required to be replenished to the bypass plenum, the inventors inventively contemplate a pressure reducing member 440, described below, to reduce the pressure of the gas being compensated to the bypass plenum.

In contrast to the third embodiment, the check structure 420 is not provided with the aforementioned seat in the present embodiment, but a decompression member 440 disposed upstream of the check structure 420 in the exhaust direction F is additionally provided within the hollow cavity 411, the decompression member 440 being located in the region of the first through-hole 416, aligned with the first through-hole 416. Of course, the decompression member 440 may be provided while the aforementioned base is maintained. The two dashed boxes in fig. 13 generally outline the check structure 420 and the biasing structure 430, respectively, according to the present embodiment, and the check structure 420 and the biasing structure 430 are substantially identical to the check structure 320 and the biasing structure 330 according to the third embodiment. In the present embodiment, the decompression member 440 disposed upstream of the check structure 420 in the exhaust direction F is disposed next to the check structure 420, which makes it possible to make the exhaust structure of the clutch assist cylinder more compact. However, the pressure relief member 440 may also be disposed spaced apart from the check structure 420.

The structure of the pressure reducing member 440 will be described in detail below. As shown in fig. 14 and 15, the decompression member 440 is substantially a cylindrical member provided with annular flanges at both ends, and mainly includes a cylindrical portion 441 as a main body portion. A main exhaust path, which will be described later, extending in the axial direction of the cylindrical portion 441 is formed in the hollow interior 444 of the cylindrical portion 441, leading to the check structure 420. A first annular flange portion 442 and a second annular flange portion 443, each having an outer diameter larger than that of the cylindrical portion 441, may be provided at both ends of the cylindrical portion 441, thereby forming a channel 445 that surrounds the outer circumferential wall of the cylindrical portion 441. A radial through hole (i.e., a second through hole) 446 is also provided through the side wall of the cylindrical portion 441, the second through hole 446 allowing the inside and the outside of the cylindrical portion 441 to communicate.

As shown in fig. 14, a positioning block 447 may be further provided at the same side of the second annular flange portion 443 as the second through hole 446. In a side wall of the hollow cavity 411 of the exhaust port 410, which is opposite to the first through hole 416 in the radial direction, a recess portion to be engaged with the positioning block 447 is provided. The positioning block 447 ensures that the pressure reducing member 440 is installed into the hollow cavity 411 of the exhaust port 410 in an orientation such that the first through hole 416 and the second through hole 446 are radially away from each other, as shown in fig. 13. In a state where the pressure reducing member 440 is mounted in the exhaust port 410, the second through hole 446 of the cylindrical portion 441, the channel 445 surrounding the outer circumferential wall of the cylindrical portion 441, and the first through hole 416 of the exhaust port 410 together form a secondary bypass flow path leading to the bypass plenum.

Alternatively, it is also conceivable for those skilled in the art that the positioning block 447 is provided at the side of the second annular flange portion 443 that is radially opposite to the second through-hole 446, and the recess that engages with the positioning block 447 is provided in the same side wall of the exhaust port 410 in the radial direction as the first through-hole 416. Further, those skilled in the art will also contemplate the location of the locating block 447 on the first annular flange portion 442.

In general, such a pressure reducing member 440 has a simple structure and a small size, and can be easily assembled into various exhaust ports of the clutch cylinder.

The function of the decompression member 440 will now be described with reference to fig. 13. In the assembled state, the relief member 440 is disposed upstream of the check structure 420 in the exhaust direction F. Thus, gas to be exhausted from the exhaust port 410 of the clutch cylinder will first pass through the pressure reducing member 440. Most of the gas will flow straight through the hollow interior 444 of the pressure relief member 440 along the main vent path, which is the main flow path, in the vent direction F to the downstream check structure 420 and vent out of the vent 410 via the check structure 420 against the biasing force of the biasing structure 430. In addition, a portion of the gas will also pass radially through the second through-holes 446 of the cylindrical portion 441 and then flow along the channels 445 around the outer circumferential wall of the cylindrical portion 441 to the first through-holes 416 radially opposite the second through-holes 446, eventually breathing compensating into the bypass plenum through the first through-holes 416. The hollow arrow M in fig. 13 shows the direction of gas flow along the secondary bypass flow path.

Compared to the case where the gas for internal respiration compensation directly flows to the bypass plenum through the first through holes 416 without providing the pressure reducing member 440, in the present embodiment, the gas for internal respiration compensation flows to the bypass plenum along the meandering bypass flow path due to the deflecting action of the pressure reducing member 440, thereby reducing the pressure of the gas flowing to the bypass plenum, and further avoiding the gas pressure from impacting components in the bypass plenum due to excessive gas pressure.

Further, the clutch assist cylinder according to the present embodiment can also obtain all the advantageous effects that can be obtained by the clutch assist cylinder according to the third embodiment, that is: the reliability of the elastic sealing gasket for sealing the exhaust port is improved by the check structure 420 including the rigid bracket and the biasing structure 430, and it is more reliably prevented that foreign materials such as rainwater, mud, etc. from the outside of the exhaust port 410 enter the clutch cylinder.

< other examples >

The various embodiments of the present disclosure can be combined in various ways, and components described with reference to one embodiment can also be used in other embodiments or replaced by components described for other embodiments.

For example, although the biasing structure has been described only with respect to the third and fourth embodiments, the biasing structure according to the present invention can also be used in the first to second embodiments, and the same advantageous effect, that is, further improvement in the reliability of the elastic sealing gasket for sealing the gas discharge port, can also be obtained in these embodiments.

For example, although the pressure reducing member has been described with reference to only the fourth embodiment, the pressure reducing member according to the present invention can also be used in the first to third embodiments, and the same advantageous effect, namely, reducing the pressure of the compensation gas flowing to the bypass plenum, avoiding the gas pressure from being too great to hit the components in the bypass plenum, can also be obtained in these embodiments.

For example, although the abutting portion of the first embodiment is perpendicular to the exhaust direction of the exhaust port, the abutting portion of the first embodiment may be configured to be inclined with respect to the exhaust direction of the exhaust port as in the second embodiment.

For example, although the abutment portion of the second embodiment is inclined with respect to the exhaust direction of the exhaust port, the abutment portion of the second embodiment may be configured to be perpendicular to the exhaust direction of the exhaust port as in the first embodiment.

Some embodiments of the invention have been described above with reference to the accompanying drawings, but the above description is only illustrative and not exhaustive. Many modifications are possible to those of ordinary skill in the art. It is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Claims (10)

1. An exhaust structure of a clutch cylinder, comprising an exhaust port to which a check structure is mounted, the check structure comprising an elastic sealing gasket and a rigid bracket provided at a side of the elastic sealing gasket facing an inside of the exhaust port for supporting the elastic sealing gasket, the rigid bracket having a gas exhaust passage, the elastic sealing gasket closing the exhaust port when a gas pressure inside the clutch cylinder is lower than a predetermined value and allowing the gas to be exhausted in an exhaust direction when the gas pressure inside the clutch cylinder exceeds the predetermined value.

2. The exhaust structure of a clutch cylinder according to claim 1, wherein a peripheral edge of the elastic seal gasket is provided with a seal reinforcing structure capable of abutting on an abutting portion provided on an inner wall of the exhaust port.

3. The exhaust structure of a clutch cylinder according to claim 2, wherein the seal-reinforcing structure is a triangular projection or a circular enlargement thicker than the rest of the elastic sealing gasket, and the abutting portion is configured to be perpendicular or inclined with respect to the exhaust direction of the exhaust port.

4. The exhaust structure of a clutch cylinder according to any one of claims 1 to 3, wherein a biasing structure disposed on a downstream side of the elastic sealing gasket in an exhaust direction is further provided inside the exhaust port, the biasing structure being configured to apply a biasing force to the elastic sealing gasket in a direction opposite to the exhaust direction, the biasing force biasing the elastic sealing gasket toward the rigid bracket.

5. The exhaust structure for a clutch cylinder according to claim 4, wherein the biasing structure comprises a spring in a pre-compressed state.

6. The exhaust structure of a clutch cylinder according to claim 4, wherein an inner wall of the exhaust port is provided with a circumferential groove, and the biasing structure is mounted in the exhaust port by means of a holder snap-fitted into the circumferential groove.

7. An exhaust structure of a clutch cylinder according to any one of claims 1 to 3, characterized in that a first through hole is provided in a side wall of the exhaust port, the first through hole being arranged upstream of the check structure in the exhaust direction and communicating to a bypass air chamber located outside the exhaust port to allow a part of the gas to be exhausted to flow to the bypass air chamber via the first through hole, and a pressure reducing member aligned with the first through hole is further provided inside the exhaust port to reduce the pressure of the gas flowing to the bypass air chamber via the first through hole.

8. The exhaust structure of a clutch assist cylinder according to claim 7, wherein the pressure reducing member includes a cylindrical portion as a main body portion, a channel is provided around an outer circumferential wall of the cylindrical portion, and a second through hole is further provided through a side wall of the cylindrical portion, the second through hole being configured to be away from the first through hole in a radial direction of the exhaust port in an attached state of the pressure reducing member.

9. The exhaust structure of a clutch cylinder according to claim 8, wherein the hollow interior of the cylindrical portion of the pressure reducing member forms a primary exhaust path to the check structure, and the second through hole of the cylindrical portion of the pressure reducing member, the channel around the outer circumferential wall of the cylindrical portion, and the first through hole of the exhaust port together form a secondary bypass flow path to the bypass air chamber.

10. A clutch cylinder, characterized in that the clutch comprises a venting structure of a clutch cylinder according to any of the preceding claims 1-9.

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