KR20180005611A - Hydraulic cylinder of receiver for a hydraulic control system - Google Patents

Abstract

The present invention relates to a receiver hydraulic cylinder (1). The receiver hydraulic cylinder (1) comprises: an annular guide tube (2); an annular piston (7) installed to move along an X axis in an axial direction on the inside of a blind cavity of the guide tube (2), and defining a hydraulic chamber (8) having a variable volume with the blind cavity; an external body (14) having a recess (31) that is formed on an inner surface of the external body (14) and disposed to face an orifice (25); and a sealing member (34) compressed in a radial direction between a first surface (32) formed around a second end portion of a supply channel (26) and defining the recess (31) in a radial direction and a second surface (35) formed on an outer wall (4) of the guide tube (2) around the orifice (25) in a manner to ensure sealing between the guide tube (2) and the external body (14), and accommodated in the recess (31).

Description

HYDRAULIC CYLINDER OF RECEIVER FOR A HYDRAULIC CONTROL SYSTEM <br> <br> <br> Patents - stay tuned to the technology HYDRAULIC CYLINDER OF RECEIVER FOR A HYDRAULIC CONTROL SYSTEM

The present invention relates to the field of hydraulic control systems. More particularly, the present invention relates to a receiver hydraulic cylinder for a hydraulic control system of, for example, an automotive clutch.

Document FR2789140 discloses a receiver hydraulic cylinder according to the prior art. The receiver hydraulic cylinder includes a guide tube defining an annular blind cavity and an annular piston moving axially within the blind cavity to define a chamber having a variable volume. A supply orifice is present on the outer wall of the guide tube. The receiver hydraulic cylinder further includes a body which is designed to surround the guide tube and to ensure the fixation of the receiver hydraulic cylinder to the vehicle body of the vehicle. The outer body includes a cavity for receiving a male tip for connection designed to be connected to a fluid supply conduit; The cavity is connected to a supply orifice formed in the outer wall of the guide tube by a bore of the outer body radially extending through the outer body.

On the one hand, a tubular sealing cartridge is installed in the perforations of the outer body to ensure sealing between the guide tube and the outer body and, on the other hand, between the cavity and the outer body for receiving the connecting male end. The tubular sealing cartridge includes an inner channel bent on the one hand so that the inner channel is opposed to the cavity that is open in the radial direction opposite to the supply orifice formed on the outer wall of the guide tube and on the other hand, do. The tubular sealing cartridge has two annular joints disposed on both sides of the end of the inner channel open opposite the cavity receiving the connecting male end and mounted in an annular groove provided on the outer periphery of the tubular sealing cartridge. An annular sealing joint is also compressed between the radially inner end of the tubular sealing cartridge and the face facing the outer wall of the guide tube around the supply orifice to prevent leakage of liquid between the guide tube and the outer body. To ensure satisfactory compression of the annular sealing joint described above, the tubular rubber is compressed radially inwardly in the radial perforations of the outer body and then welded to the outer body at this location.

Receiver hydraulic cylinders of the type described above are not entirely satisfactory. In particular, if compressing the sealing cartridge into the perforations and welding the sealing cartridge onto the outer body allows precise control of the compression of the O-ring, they will reduce the complexity of manufacturing such a receiver hydraulic cylinder Increase.

The basic idea of the present invention is to propose a receiver hydraulic cylinder that is simple and ensures reliable sealing between the outer body and the guide tube.

According to one embodiment, the present invention provides a receiver hydraulic cylinder,

An annular guide tube having a cylindrical outer wall and a cylindrical inner wall connected to the outer wall by a bottom wall, wherein the outer wall, the inner wall and the bottom wall define an annular blind cavity and the outer wall has an orifice;

An annular piston arranged to move axially in the interior of the blind cavity along the X axis and defining a hydraulic chamber having a variable volume with the blind cavity;

An outer body having an inner surface surrounding the guide tube, the fluid supply channel having a first end designed to be connected to the fluid supply conduit and a second end open to a recess formed in the inner surface of the outer body, And the recess is disposed facing the orifice; And

On the one hand, a first face formed around the second end of the supply channel and defining a recess in the radial direction, on the one hand, and on the other hand, around the periphery of the orifice And a sealing member which is compressed in the radial direction between the second surface formed on the outer wall of the guide tube and accommodated in the recess.

Therefore, such a receiver hydraulic cylinder is simple and does not have an additional sealing cartridge because the sealing member is directly compressed between the outer body and the outer wall of the guide tube to ensure sealing between the body and the guide tube without an intermediate element.

According to other advantageous embodiments, such a receiver hydraulic cylinder may have one or more of the following features.

According to one embodiment, the inner surface and the first surface of the outer body are formed as a single short block member.

In an advantageous manner, the outer body is a single block element without a tubular sealing cartridge mounted in the perforations of the body.

According to one embodiment, the guide tube and the outer body are arranged such that the assembly of the elements is carried out by axial insertion of the guide tube into the outer body.

According to one embodiment, the guide tube includes a chamfer between the outer wall and the bottom.

According to one embodiment, the radially outer edge of the orifice is chamfered.

According to one embodiment, the sealing member comprises an annular sealing joint and the recess has a shape adapted to the shape of the annular sealing joint.

According to one embodiment, the annular sealing member comprises an annular joint, wherein the annular joint is secured to the outer body in the recess by adhesion, by interference or by overmolding with respect to each other.

According to one embodiment, the outer body has a rear edge supported against the bottom wall of the guide tube, and the recess is open at the rear edge.

According to one embodiment,

An insert received in the recess, said insert being provided on the one hand with an opening facing the second end of the supply conduit and on the other hand facing the orifice; And

And one or more annular sealing joints accommodated in the opening and arranged to be compressed between the first and second surfaces.

According to one embodiment,

An insert received in the recess, said insert being provided on the one hand with an opening facing the second end of the supply conduit and on the other hand facing the orifice; And

And an annular sealing joint received within the opening of the insert and protruding from both sides of the insert in the radial direction and compressed between the first and second surfaces.

According to another embodiment,

An insert which is received in the recess and which is provided with an opening facing the second end of the fluid supply conduit and on the other hand facing the orifice, the opening having a first shoulder and a second shoulder, The insert comprising a radially inward second shoulder;

A first annular sealing joint received against the first shoulder and compressed between the insert and the first surface; And

And a second annular sealing joint received against the second shoulder and being compressed between the insert and the second surface.

According to another embodiment, the annular sealing joint (s) are secured to the insert within the opening of the insert by adhesion, by interference or by overmolding with respect to each other.

According to another embodiment, the sealing member comprises one or more annular sealing joints made of an elastomer, for example ethylene-propylene-diene monomer (EPDM).

According to one embodiment, the present invention also provides an automobile comprising the above receiver hydraulic cylinder.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will become better understood when taken in conjunction with the following detailed description of a number of specific embodiments of the invention, given by way of illustration and not limitation, with reference to the accompanying drawings, in which the more detailed objects, Will be.
1 is an axial sectional view of a receiver hydraulic cylinder according to a first embodiment;
2 is a cross-sectional side view of the receiver hydraulic cylinder of Fig. 1;
3 is a detailed axial cross-sectional view of the hydraulic cylinder of Figs. 1 and 2 showing a recess provided in the inner surface of the outer body and a sealing member received in the recess.
4 is a cross-sectional side view of the receiver hydraulic cylinder according to the second embodiment;
5 is a detailed axial cross-sectional view of the hydraulic cylinder of Fig.
Fig. 6 is a perspective view of the sealing member of the receiver hydraulic cylinder of Figs. 4 and 5. Fig.
Fig. 7 is a perspective view of the receiver hydraulic cylinder of Figs. 4 to 6 during the installation step of the sealing member. Fig.
8 is a perspective view of the sealing member according to the third embodiment.
9 is a cross-sectional view of the sealing member of Fig.
10 is a perspective view of a sealing member according to the fourth embodiment.
11 is a sectional view of the sealing member of Fig.
12 is a perspective view of a sealing member according to the fifth embodiment.
13 is a sectional view of the sealing member of Fig.
14 is a perspective view of a sealing member according to the sixth embodiment.
15 is a sectional view of the sealing member of Fig.

In the present specification and claims, the terms "outer" and "inner" and "axis" and "radial" orientations will be used to refer to elements of a receiver hydraulic cylinder in accordance with the definitions given in the specification. For convenience, the "radial" orientation is oriented orthogonally to the sliding axis X of the piston of the receiver hydraulic cylinder defining the "axis" orientation, from the inside to the outside, away from the axis. The terms "outer" and "inner" are used to define relative positions relative to other elements of one element with respect to the X axis, It is called. On the other hand, the terms "rear" AR and "forward" AV are used to define the relative position of one element along the axial direction to another element.

Fig. 1 shows a receiver hydraulic cylinder 1 of the clutch control system. In order to displace the clutch between the clutch connecting position and the clutch disengaging position, the receiver hydraulic cylinder 1 is designed to cooperate with the diaphragm of a clutch not shown. Such a receiver hydraulic cylinder 1 is designed to be connected to an emitter hydraulic cylinder, not shown, through a fluid supply conduit. The fluid is, for example, oil. The emitter hydraulic cylinder is designed by a control rod to be connected to an actuating element such as a pedal or an electric actuator. When the driver depresses such a pedal, the emitter hydraulic cylinder drives the fluid in the direction of the receiver hydraulic cylinder 1 to displace the clutch from its clutch connecting position toward its clutch releasing position.

The receiver hydraulic cylinder 1 includes an annular metal guide tube 2 which provides an internal space 3 designed to pass a transmission shaft which is not shown, such as an input shaft of a gearbox. The guide tube 2 includes a cylindrical inner wall 5 connected to the outer wall 4 by a cylindrical outer wall 4 and a bottom wall 6. The outer wall (4) has an axial dimension smaller than the axial dimension of the inner wall (5). The inner wall 5 and the outer wall 4 and the bottom wall 6 together define a blind cavity and an annular piston 7 is installed in the interior of the blind cavity so as to move in the axial direction. Thus, the annular piston 7 defines an annular chamber 8 having a variable volume with the blind cavity.

The annular piston (7) is provided, at its rear end, with a dynamic sealing joint (9) ensuring the sealing of the annular chamber (8) with a variable volume. Further, the annular piston (7) has a rotary bearing (10) at the front end thereof. The rotary bearing 10 includes one ring 11 fixed to the annular piston 7, another ring 12 designed to be supported against the fingers of the diaphragm of the clutch and two rings 11 and 12 And a rolling body 13 such as a ball to be inserted. The annular piston 7 is cast, for example, from a plastic material.

In addition, the receiver hydraulic cylinder 1 includes an outer body 14 designed to ensure the fixation of the receiver hydraulic cylinder 1 to the vehicle body of the vehicle. To this end, the outer body 14 comprises, for example, an ear 15, as shown in Fig. 7, which is fixed to the vehicle wall, such as the wall of the gearbox housing, An orifice 16 is provided to allow passage of the member.

Returning to Fig. 1, it is observed that the outer body 14 has an inner surface surrounding the guide tube 2. The outer body 14 is also fixed to this guide tube 2. To this end, in the embodiment shown, the outer body 14 comprises a rear edge 17 and, on the other hand, a plastic leg 18, which is bearably supported against the bottom wall 6 of the guide tube 2 And the ends of the plastic legs engage with the grooves provided on the outer surface of the outer wall 4 of the guide tube 2. The outer body is cast with a polymer such as polyamide 6-6.

The outer body 14 includes a support shoulder 19 for the preload spring 20 acting between the outer body 14 and the annular piston 7 toward the front. This pre-loaded spring 20 is designed to ensure continued support of one of the rings 12 of the rotary bearing 10 relative to the fingers of the diaphragm of the clutch.

In addition, the receiver hydraulic cylinder 1 includes protective bellows 21 made of an elastomeric material, which prevents contamination of the blind cavity by impurities. The protective bellows 21 surrounds the preload spring 20 and is provided with a rear end 22 having a flange mounted in a recess provided in the outer body 14 and a rear end 22 provided in the socket 24 for engagement with the annular piston 7. [ And a front end portion (23) having a flange provided in the groove.

In Fig. 2, the hydraulic fluid supply conduit of the hydraulic chamber 8 of the receiver hydraulic cylinder 1 is observed. The outer wall (4) of the guide tube (2) includes an orifice (25) near the bottom wall (6). The outer body 14 also includes a supply channel 26, a portion of which is connected to an unillustrated piping that is connected to the emitter hydraulic cylinder and has a connecting male end 27 for connecting the receiver hydraulic cylinder 1, Lt; / RTI &gt;

The male tip 27 is cast, for example, with a polymer such as polyamide 6-6. The male end 27 has, on its outer surface, an annular groove on which an annular joint 28 is provided. The annular joint 28 is compressed against the inner surface of the supply channel 26 to ensure sealing between the male end 27 and the outer body 14. [

The male end 27 is held in the engaged position inside the supply channel 26 by the connecting pin 29. The connecting pin 29 includes two branches forming a substantially U-shape. Each branch of the connecting pin 29 passes across each opening provided in the outer body 14 and open into the interior of the supply channel 26. The male end 27 also includes an annular groove 30 that can face the orifice provided in the outer body 14 when the male end 27 is installed in the supply channel 26. Thus, two branches of the connecting pin 29 can be positioned in the annular groove 30 when engaged with the openings provided in the outer body 14, 27). The connecting pin 29 is made of, for example, metal. Such connection pins 29 are described, for example, in document FR2808071 A1.

The second portion of the supply channel 26 is open to the recess 31 formed in the inner surface of the outer body 14 and has a radial orientation. The recess 31 is disposed facing the orifice 25. The recess 31 is defined here by a radially outward wall 32 and a peripheral wall 33. The walls 32, 33 of the recess 31 are integral with the outer body 14.

An annular sealing joint 34 is received in the interior of the recess 31 and is formed around the orifice 25 in a radially outer direction 35 of the recess 31 and a surface 35 formed in the outer wall 6 of the guide tube 2, And is radially compressed between the walls 32. Thus, the annular sealing joint 34 ensures sealing between the guide tube 2 and the outer body 14. The annular sealing joint 34 is made of, for example, an ethylene-propylene-diene monomer (EPDM). The annular sealing joint 34 may be toroidal or may have any other cross-section, e.g., square, oval or rectangular.

In an advantageous manner, the recess 31 has a shape adapted to the shape of the annular sealing joint 34 and ensures its proper positioning.

The annular sealing joint 34 is disposed in the recess 31 before the guide tube 2 is fitted into the outer body 14. In the assembly of the receiver hydraulic cylinder 1, An annular sealing joint 34 is secured to the outer body 14 to ensure the retention of the annular sealing joint 34 within the recess 31. To do this, according to one embodiment, the annular sealing joint 34 is bonded to the radially outer wall 32 of the recess 31. According to another embodiment, the annular sealing joint 34 is mounted in the recess 31 by force so that the fixing is ensured by the interference. Finally, according to another embodiment, the outer body 14 is overmolded on the annular sealing joint 34 so that the outer body 14 and the annular sealing joint 34 are fixed to each other, Lt; / RTI &gt;

3, the guide tube 2 is moved along the X-axis until the bottom wall 6 of the guide tube 2 is pushed against the rear edge 17 of the outer body 14, as shown in Fig. And slides inside the outer body 14 from the front to the rear. In an advantageous manner, the bottom wall 6 of the guide tube 2 is connected to the outer wall 4 by a chamfer 36. The contact of the annular sealing joint 34 with the chamfer 36 causes the annular sealing joint 34 to move radially in the radial direction 31 of the recess 31 while the guide tube 2 is sliding into the interior of the outer body 14. [ And has an effect of gradually compressing against the outer wall 32. On the other hand, it is also observed in Fig. 3 that the radially outer edge 37 of the orifice 25 of the guide tube 2 is chamfered. The regions of the guide tube 2 that are likely to come into contact with the annular sealing joint 34 when inserting the guide tube 2 into the interior of the outer body 14 are therefore arranged to have sharp edges 34 which can damage the annular sealing joint 34 .

Figs. 4 to 7 show a receiver hydraulic cylinder according to the second embodiment. Fig.

In this embodiment, the recess 31 is opened rearward so that the sealing member 38 can be introduced after the outer body 14 and the guide tube 2 are assembled to each other, and the rear portion of the outer body 14 And is opened at the edge 17.

The sealing member 38 shown in detail in FIG. 6 includes an insert 39 and an annular sealing joint 34. The insert 39 includes an opening 40 in which an annular sealing joint 34 is installed. The opening 40 is adjusted to conform to the external shape of the annular sealing joint 34. The insert 39 is designed to be inserted into the interior of the recess 31 by the rear portion of the outer body 14 because it includes a shape complementary to the shape of the recess 31. [ 4 and 5, the annular sealing joint 34 in the correct position is positioned between the face 35 formed in the outer wall 6 of the guide tube 2 around the orifice 25 and the recess 35 formed in the recess 31, The annular sealing joint 34 has a height that is greater than the height of the opening so that it is radially compressed between the radially outer side walls 32 of the annular seal.

7, after the guide tube 2 and the outer body 14 are fixed in advance with respect to each other, the sealing member 38 comprising the insert 39 and the annular sealing joint 34 is moved in the axial direction And is inserted into the recess 31 from the rear side toward the front side.

An annular sealing joint 34 is secured to the insert 39 and is retained inside the opening 40 by, for example, gluing or by force application. Alternatively, the insert 39 and the annular sealing joint 34 may be secured to each other by overmolding.

As shown in Fig. 5, the guide tube 2 may be provided with an annular sealing joint 34 as described in relation to the previous embodiments, so that the annular sealing joint 34 does not face a sharp edge when the insert 39 is installed in the recess 31. [ And has the same features as those of FIG.

Also, in an advantageous manner, the rear end of the insert 39 is level with the rear face of the rear edge 17 when the insert 39 is installed in the recess 31. Therefore, when the receiver hydraulic cylinder 31 is fixed to the vehicle body, the correct positioning of the insert 39 in the recess 31 of the outer body 14 is prevented from occurring when the receiver hydraulic cylinder 1 is fixed to the gearbox It is ensured by the wall of the housing.

8 and 9 on the one hand and Figs. 9 and 10 on the other hand show two sealing members 38 which can be inserted into the recess 31 of the outer body 14 of Figs. 4-7 .

The annular sealing joint 34 shown in Figs. 8 and 9 has a rectangular cross-section along the radial plane at the axis of the annular sealing joint 34. Fig.

10 and 11, the annular periphery of the annular sealing joint 34 has an annular groove 41 that receives an annular projection 42 of a complementary shape formed in the inner periphery of the opening 40 . The annular sealing joint 38 and the opening 40 are thus adapted to ensure a fixed and precise relative positioning of the annular sealing joint 38 within the opening 40 of the insert 39.

12 and 13 show that the sealing member 38 is positioned between the radially outer wall 32 of the recess 32 and the insert 39 around the orifice 25 and between the insert 39 34b designed to be compressed in the radial direction between the outer wall 4 of the guide tube 2 and the annular sealing joints 34a, 34b, respectively. To do this, the openings 40 have two outer and inner shoulders 43, 44, respectively, one and the other of which is located two annular sealing joints 34a, 34b with respect to these shoulders .

The embodiment of Figures 14 and 15 differs from the embodiment of Figures 12 and 13 in that the outer annular sealing joint 34a is not aligned with the other annular sealing joint 34b along the radial direction. This arrangement is particularly advantageous when the feed channel 26 has a large slope with respect to the radial direction and is open into the recess 31.

While the invention has been described in connection with a number of specific embodiments, it is evident that the invention is not limited thereto, and that the invention encompasses all technical equivalents of the disclosed means, and combinations thereof, as fall within the scope of the invention.

The use of the terms " comprises, "" including," or " including, " and uses thereof does not exclude the presence of other elements or steps than those stated in the claims.

In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

Claims (11)

In the receiver hydraulic cylinder 1,
An annular guide tube (2) having a cylindrical inner wall (5) connected to said outer wall (4) by a cylindrical outer wall (4) and a bottom wall (6), said outer wall (4) Wherein the bottom wall (6) defines an annular blind cavity and the outer wall (4) comprises an orifice (25);
An annular piston (7) installed to move axially in the interior of the blind cavity along the X axis and defining a hydraulic chamber (8) having a variable volume with the blind cavity;
An outer body (14) having an inner surface surrounding said guide tube (2), said outer body (14) having a first end designed to be connected to a fluid supply conduit and a second end The outer body (14) including a fluid supply channel (26) having two ends, the recess (31) being disposed facing the orifice (25); And
On the one hand, around the second end of the supply channel (26) and in the radial direction of the recess (31) in such a way as to ensure a seal between the guide tube (2) and the outer body (14) On the one hand and a second surface (35) formed on the outer wall (4) of the guide tube (2) around the orifice (25) And a sealing member (34, 34a, 34b, 38) received in the recess (31)
Receiver Hydraulic Cylinder. The method according to claim 1,
The inner surface of the outer body 14 and the first surface 32 are formed as a single block single member
Receiver Hydraulic Cylinder. 3. The method according to claim 1 or 2,
Wherein the guide tube (2) comprises a chamfer (36) between the outer wall (4) and the bottom (6)
Receiver Hydraulic Cylinder. 4. The method according to any one of claims 1 to 3,
The radially outer edge 37 of the orifice 25 is chamfered
Receiver Hydraulic Cylinder. 5. The method according to any one of claims 1 to 4,
Wherein said sealing member comprises an annular sealing joint (34), said recess (31) having a shape adapted to the shape of said annular sealing joint (34)
Receiver Hydraulic Cylinder. 6. The method according to any one of claims 1 to 5,
Wherein the annular sealing member comprises an annular sealing joint and wherein the annular sealing joint is attached to the outer body in the recess by adhesive bonding, )
Receiver Hydraulic Cylinder. 5. The method according to any one of claims 1 to 4,
The outer body 14 has a rear edge 17 which is supported against the bottom wall 6 of the guide tube 22 and the recess 31 is open at the rear edge 17
Receiver Hydraulic Cylinder. 8. The method of claim 7,
The sealing member (38)
An insert (39) received in the recess (31) is provided with an opening (40) facing the second end of the supply conduit (26), on the other hand facing the orifice (25) Said insert (39); And
Includes an annular sealing joint (34) received within an opening (40) of the insert and protruding radially from both sides of the insert (39) and compressed between the first surface (32) and the second surface (35) doing
Receiver Hydraulic Cylinder. 8. The method of claim 7,
The sealing member (38)
An insert (39) is received in said recess (31), on the one hand being provided with an opening (40) facing the second end of said supply conduit (26) and on the other hand facing said orifice (25) , Said opening (40) comprising a radially outward first shoulder (43) and a radially inward second shoulder (44);
A first annular sealing joint (34a) received against said first shoulder (43) and compressed between said insert (39) and said first side (32); And
And a second annular sealing joint (34b) received against said second shoulder (44) and compressed between said insert (39) and said second surface (35)
Receiver Hydraulic Cylinder. 11. The method according to claim 9 or 10,
The annular sealing joint (s) 34, 34a, 34b are secured to the insert 39 in the opening 40 of the insert 39 by adhesion, by interference or by overmolding with respect to each other
Receiver Hydraulic Cylinder. 11. The method according to any one of claims 1 to 10,
The sealing member comprises one or more annular sealing joints (34, 34a, 34b) made of an elastomer
Receiver Hydraulic Cylinder.

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