CN109253184B - Piston, clutch release system master cylinder, and method for manufacturing piston body - Google Patents
Piston, clutch release system master cylinder, and method for manufacturing piston body Download PDFInfo
- Publication number
- CN109253184B CN109253184B CN201710565151.5A CN201710565151A CN109253184B CN 109253184 B CN109253184 B CN 109253184B CN 201710565151 A CN201710565151 A CN 201710565151A CN 109253184 B CN109253184 B CN 109253184B
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- piston
- main body
- flange
- auxiliary
- piston main
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D25/00—Fluid-actuated clutches
- F16D25/12—Details not specific to one of the before-mentioned types
Abstract
The invention provides a piston, a clutch release system master cylinder, and a method of manufacturing a piston body. A piston for a master cylinder of a clutch release system includes a piston body including a flange at one axial end thereof, and a supplementary sealing area at the other axial side of the flange. The piston main body further includes a positioning groove located on the other axial side of the auxiliary seal region, the auxiliary seal region being defined between the flange and the positioning groove in the axial direction of the piston main body, and a diameter of the auxiliary seal region being greater than or equal to a maximum diameter of a portion located on the other axial side of the auxiliary seal region of the piston main body. In the present invention, the auxiliary sealing portion may be axially restrained via the flange and the positioning piece fitted with the positioning groove. The auxiliary seal region can be formed by using a single mold whose axially demolded inner circumferential surface is annular, thus avoiding leakage of brake liquid caused by a parting line.
Description
Technical Field
The present invention relates to a clutch release system in vehicle engineering, and more particularly, to a piston for a clutch release system master cylinder, a clutch release system master cylinder including the piston, and a method of manufacturing a piston body of the piston.
Background
Clutch release system master cylinders are known in the art. Fig. 1 shows a master cylinder 1 of the prior art. The master cylinder 1 has a master cylinder housing 2, in which master cylinder housing 2 a piston 3 is guided in an axially displaceable manner. The piston 3 is pressed axially into the cylinder interior (in the master cylinder housing 2) by a piston rod 4, for example by a pedal (not shown). The accompanying flow pipe 5 is connected to an accompanying flow container (not shown). The auxiliary seal 9 is provided at one axial end of the piston 3. A primary seal portion 6 is provided at the other end portion in the axial direction of the piston 3, the primary seal portion 6 being fixed to the piston 3 by means of a magnet pin 7 and defining a pressure chamber 8 within the master cylinder housing 2. A flow-following chamber 10 is defined between the primary seal 6 and the secondary seal 9.
Fig. 2 shows a front view of the piston body 31 of a piston according to the prior art. Referring to fig. 2, the piston main body 31 has a supplementary seal area 32 at one axial end thereof (an axial end near the piston rod). The first flange 33 and the second flange 34 are provided on both axial sides of the auxiliary seal region 32, thereby preventing axial displacement of an auxiliary seal portion (not shown) attached to the auxiliary seal region 32.
In the design of the piston main body 31 shown in fig. 2, due to the presence of the first flange 33 and the second flange 34, the mold for manufacturing the auxiliary sealing region 32 must include a plurality of split molds, which can be demolded only from the radial direction and cannot be demolded from the axial direction when manufacturing the piston main body 31. Therefore, a parting line (a convex mark) is inevitably formed at the auxiliary seal region 32, and the radial height of the parting line becomes large as the die wears with use. The parting line pushes up the auxiliary seal portion radially outward, so that a gap is formed between the outer peripheral surface of the auxiliary seal region 32 of the piston main body 31 and the inner peripheral surface of the auxiliary seal portion, which may cause leakage of the brake liquid in the following chamber 10 (see fig. 1).
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a piston for a clutch release system master cylinder, a clutch release system master cylinder including the same, and a method of manufacturing a piston body of the same, which can prevent a brake fluid from leaking at an auxiliary seal portion.
A piston for a master cylinder of a clutch release system, the piston comprising a piston body including a flange at one axial end thereof, a supplementary sealing region at the other axial side of the flange,
wherein the piston main body further includes a positioning groove on the other axial side of the auxiliary seal region, the auxiliary seal region being defined between the flange and the positioning groove in the axial direction of the piston main body, the auxiliary seal region having a diameter greater than or equal to a maximum diameter of a portion on the other axial side of the auxiliary seal region of the piston main body.
Preferably, the flange protrudes toward a radially outer side of the piston main body than an outer periphery of the auxiliary seal region, and the positioning groove is recessed toward a radially inner side of the piston main body than the outer periphery of the auxiliary seal region.
Preferably, the piston further includes an auxiliary sealing portion mounted to the auxiliary sealing region, and a positioning member mounted to the positioning groove, the positioning member protruding radially outward of the piston main body than an outer circumferential surface of the auxiliary sealing region, so that the flange and the positioning member axially position-limit the auxiliary sealing portion.
Optionally, the positioning groove is formed as an annular groove extending over the entire circumference of the piston body, and the positioning member is an annular positioning member.
Optionally, the positioning member is made of rubber.
Alternatively, the positioning groove may be formed to extend over the entire circumference of the piston main body, or the positioning groove may extend only in a partial region in the circumferential direction of the piston main body,
the positioning piece is a U-shaped or C-shaped positioning piece.
Optionally, the positioning member is made of plastic or metal.
Preferably, the piston further includes a magnet located on the other axial side of the piston main body, and a main seal portion, the magnet and the main seal portion being attached to the piston main body with a magnet pin inserted into a shaft hole of the other axial end portion of the piston main body.
The invention also provides a clutch release system master cylinder comprising a piston according to the invention.
The present invention also provides a method of manufacturing a piston main body of the piston according to the present invention, wherein the manufacturing method includes forming at least the auxiliary seal region of the piston main body using a mold having an annular inner peripheral surface, wherein the mold is demolded in an axial direction of the piston main body.
In the piston for a clutch release system master cylinder and the clutch release system master cylinder including the same of the present invention, since the auxiliary sealing region is defined between the flange and the positioning groove, the auxiliary sealing portion can be axially restrained via the flange and the positioning piece engaged with the positioning groove. Since the diameter of the auxiliary sealing area is greater than or equal to the maximum diameter of the portion located on the other axial side of the auxiliary sealing area of the piston main body, the auxiliary sealing area can be molded by using a single mold with an axially demolded inner circumferential surface being annular, thereby preventing leakage of brake fluid caused by a parting line.
Drawings
Fig. 1 shows an axial section through a master cylinder of a clutch release system according to the prior art.
Fig. 2 shows a side view of a piston body of a piston for a master cylinder of a clutch release system according to the prior art.
Fig. 3A shows a side view of a piston body of a piston for a clutch release system master cylinder according to a first embodiment of the present invention.
Fig. 3B shows a positioning member for a piston according to a first embodiment.
Fig. 3C shows an axial cross-section of the piston according to the first embodiment.
Fig. 3D shows a method of manufacturing the piston main body of the piston according to the first embodiment.
Fig. 4A, 4B and 4C show a piston for a master cylinder of a clutch release system according to a second embodiment of the present invention, similarly to fig. 3A, 3B and 3C.
Description of the reference numerals
1 a master cylinder; 2 a master cylinder housing; 3, a piston; 4a piston rod; 5 a flow following pipeline; 6 a main sealing part; 7 a magnet pin; 8 pressure chambers; 9 an auxiliary seal part; 10 a flow following chamber; 31 a piston body; 32 a secondary sealing area; 33 a first flange; 34 a second flange;
300 a piston; 310 a piston body; 320 an auxiliary sealing area; 330 a flange; 350 positioning grooves; 360 a positioning member; 361. 362 an arm portion; 363 bottom; 370 an auxiliary seal portion; 380 magnets; 390 a primary seal; a 400 magnet pin; 800 a first mold; 910. 920 splitting of the second mold.
Detailed Description
Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the detailed description is intended only to teach one skilled in the art how to practice the invention, and is not intended to be exhaustive or to limit the scope of the invention.
First embodiment
A first embodiment of the present invention provides a piston for a master cylinder of a clutch release system. Referring to fig. 3A through 3C, the piston 300 includes a piston body 310, the piston body 310 being generally cylindrical and may be a molded, one-piece structure. The piston main body 310 includes: a flange 330 at one axial end thereof (piston rod mounting end); a secondary sealing area 320 located on the other axial side of the flange 330; and a positioning groove 350 located on the other axial side of the auxiliary sealing region 320. In the axial direction of the piston main body 310, a supplementary sealing region 320 is defined between the flange 330 and the seating groove 350.
Similar to the prior art, the auxiliary sealing region 320 has an annular outer surface, and the flange 330 protrudes radially outward than the outer surface of the auxiliary sealing region 320. Unlike the piston main body 31 shown in fig. 2, in the piston main body 310 of the present embodiment, a positioning groove 350 is formed to be recessed radially inward of the outer surface of the auxiliary seal region 320, instead of the second flange 34 in the piston main body 31.
In the present embodiment, the positioning groove 350 is formed as an annular groove extending over the entire circumference of the piston main body 310. The piston 300 further includes a retainer 360, and the retainer 360 is formed in a circular ring shape. Preferably, but not limitatively, the positioning member 360 is formed of an elastic material such as rubber. When the positioning member 360 is mounted to the positioning groove 350, a radially inner portion of the positioning member 360 is caught in the positioning groove 350, and a radially outer portion of the positioning member 360 protrudes radially outward of an outer surface of the supplementary sealing region 320. So that the flange 330 and the positioning member 360 limit the axial movement of the auxiliary sealing part 370 when the auxiliary sealing part 370, for example, made of rubber, is mounted to the auxiliary sealing region 320 and the positioning member 360 is mounted to the positioning groove 350. For example, when a certain vacuum is generated in the slave chamber 10 (see fig. 1) when the brake fluid is injected into the master cylinder, the positioning member 360 may prevent the auxiliary sealing part 370 from being axially moved under the vacuum.
As can be seen with reference to the reference dotted lines a1 and a2 in fig. 3A, in the piston main body 310 of the present embodiment, the auxiliary sealing region 320 has the largest diameter D except for the flange 330. In other words, the maximum diameter of the portion of the piston main body 310 located on the other axial side (main seal portion side) of the auxiliary seal region 320 is equal to or smaller than the diameter D of the auxiliary seal region 320.
Referring to fig. 3D, in forming the piston body 310 by molding, a first mold (may also be referred to as a "slider") 800 may be used to form the auxiliary sealing region 320 of the piston body 310. The inner circumferential surface of the first mold 800 is annular to form the outer circumferential surface of the auxiliary sealing region 320. As shown by hollow arrows in fig. 3D, the first mold 800 is demolded in the axial direction of the piston main body 310 so that a parting line is not formed on the outer circumferential surface of the auxiliary sealing region 320, and leakage of brake fluid due to a gap generated between the outer circumferential surface of the auxiliary sealing region 320 and the auxiliary sealing portion 370 can be prevented.
A second mold may be used to form a portion of the piston body 310 located at the other axial side of the auxiliary sealing region 320. The second mold may include two split molds 910 and 920, as indicated by hollow arrows in fig. 3D, and the two split molds 910 and 920 are split in a radial direction of the piston main body 310, so that various patterns on the piston main body 310 may be easily formed.
Referring to fig. 3C, the piston 300 of the present embodiment further includes a magnet pin 400 mounted in the shaft hole at the other axial end of the piston main body 310 by, for example, interference fit. The magnet pin 400 fixes the magnet 380 and the main seal portion 390 to the other axial side of the piston main body 310. As can be understood from fig. 3C, the reduction in diameter of the portion of the piston body 310 on the other axial side of the auxiliary seal region 320 does not affect the installation of the main seal 390 and the magnet 380.
Second embodiment
A second embodiment according to the present invention is explained below with reference to fig. 4A to 4C.
The same or similar components as those of the first embodiment are denoted by the same or similar reference numerals, and repeated explanation thereof is omitted.
The second embodiment is different from the first embodiment in that the positioning groove 350 of the second embodiment is formed in a structure to be engaged with the U-shaped positioning member 360. Accordingly, in one example, the positioning groove 350 may be formed as two straight grooves perpendicular to the axial direction of the piston main body 310 facing away from each other in the radial direction of the piston main body 310. Which engage with the two arms 361, 362, respectively, of the U-shaped positioning member 360. In another example, the positioning slot 350 may further comprise a curved slot connecting two straight slots for mating with the bottom 363 of two arms 361, 362 of the connecting U-shaped positioning member 360.
In the case where the positioning member 360 is a U-shaped positioning member, the U-shaped positioning member is preferably, but not limited to, formed of a material having a certain elasticity and rigidity, such as plastic, metal, or the like. Thus, it is possible to facilitate the installation of the U-shaped positioning member 360 into the positioning groove 350 while preventing the U-shaped positioning member 360 from being separated from the positioning groove 350.
This embodiment can obtain the similar effect to the first embodiment, that is, when molding the auxiliary sealing region 320, the mold can be demolded in the axial direction of the piston main body 310, so that a parting line is not formed on the outer circumferential surface of the auxiliary sealing region 320, and leakage of the brake fluid due to a gap generated between the outer circumferential surface of the auxiliary sealing region 320 and the auxiliary sealing portion 370 can be avoided.
The invention also provides a clutch release system master cylinder including the piston according to the invention and a method of manufacturing a piston body of the piston.
It should be understood that the above embodiments are only exemplary and are not intended to limit the present invention. Various modifications and alterations of the above-described embodiments may be made by those skilled in the art in light of the teachings of the present invention without departing from the scope thereof.
(1) Although not specifically illustrated above, the piston body 310 may be made of, without limitation, a plastic material such as glass fiber reinforced nylon (e.g., PA66-GF 35).
(2) The first mold 800 shown in fig. 3D may also be used to form at least a portion of the flange 330 of the piston body 310.
(3) Instead of the circular ring-shaped positioning member 360 in the first embodiment or the U-shaped positioning member 360 in the second embodiment, a C-shaped positioning member may be used.
(4) The positioning groove 350 is not limited to continuously extending over the entire circumference of the piston main body 310, and the positioning groove 350 may also represent, for example, intermittent plural recesses scattered in the circumferential direction of the piston main body 310, which may be fitted with plural protrusions of the positioning member protruding radially inward to achieve positioning of the positioning member in the positioning groove and prevent the positioning member from moving in the axial direction of the piston main body.
Claims (8)
1. A piston for a master cylinder of a clutch release system, the piston comprising a piston body including a flange at one axial end thereof, a supplementary sealing region at the other axial side of the flange,
characterized in that the piston main body is of a one-piece structure, the piston main body further includes a positioning groove on the other axial side of the auxiliary seal region, the auxiliary seal region is defined between the flange and the positioning groove in the axial direction of the piston main body, the diameter of the auxiliary seal region is greater than or equal to the maximum diameter of a portion on the other axial side of the auxiliary seal region of the piston main body,
the flange is projected to a radially outer side of the piston main body than an outer peripheral surface of the auxiliary seal region, the positioning groove is recessed to a radially inner side of the piston main body than an outer peripheral surface of the auxiliary seal region,
the piston further comprises an auxiliary sealing part arranged in the auxiliary sealing area and a positioning piece arranged in the positioning groove, the radial inner side part of the positioning piece is clamped in the positioning groove to prevent the positioning piece from moving along the axial direction of the piston body, and the positioning piece protrudes towards the radial outer side of the piston body compared with the outer peripheral surface of the auxiliary sealing area, so that the flange and the positioning piece axially limit the auxiliary sealing part.
2. The piston according to claim 1, wherein the positioning groove is formed as an annular groove extending over the entire circumference of the piston main body, and the positioning member is an annular positioning member.
3. The piston of claim 2 wherein said positioning member is made of rubber.
4. The piston according to claim 1, wherein the positioning groove is formed to extend over the entire circumference of the piston main body, or the positioning groove extends only in a partial area in the circumferential direction of the piston main body,
the positioning piece is a U-shaped or C-shaped positioning piece.
5. The piston of claim 4 wherein said retainer is made of plastic or metal.
6. The piston according to any one of claims 1 to 5, further comprising a magnet located on the other axial side of the piston main body, a main seal portion, the magnet and the main seal portion being attached to the piston main body with a magnet pin inserted into a shaft hole of the other axial end portion of the piston main body.
7. A clutch release system master cylinder, characterized in that it comprises a piston according to any one of claims 1 to 6.
8. A method of manufacturing a piston body, the piston body being a piston body of a piston according to any one of claims 1 to 6,
the manufacturing method is characterized by forming at least the auxiliary seal region of the piston main body using a mold having an annular inner peripheral surface, wherein the mold is demolded in an axial direction of the piston main body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710565151.5A CN109253184B (en) | 2017-07-12 | 2017-07-12 | Piston, clutch release system master cylinder, and method for manufacturing piston body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710565151.5A CN109253184B (en) | 2017-07-12 | 2017-07-12 | Piston, clutch release system master cylinder, and method for manufacturing piston body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109253184A CN109253184A (en) | 2019-01-22 |
| CN109253184B true CN109253184B (en) | 2022-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710565151.5A Active CN109253184B (en) | 2017-07-12 | 2017-07-12 | Piston, clutch release system master cylinder, and method for manufacturing piston body |
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| CN (1) | CN109253184B (en) |
Citations (9)
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| EP1602544B1 (en) * | 2004-06-04 | 2011-01-05 | ZF Friedrichshafen AG | Hydraulic master cylinder |
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| DE102011088469A1 (en) * | 2010-12-22 | 2012-07-05 | Schaeffler Technologies Gmbh & Co. Kg | Master cylinder for e.g. hydraulic clutch of vehicle, has pressure chamber sealed opposite to piston and housing by primary seal that is formed on side of intermediate ring, where intermediate ring is arranged between housing and piston |
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| WO2015086010A1 (en) * | 2013-12-09 | 2015-06-18 | Schaeffler Technologies AG & Co. KG | Master cylinder |
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| CN105221598A (en) * | 2014-06-06 | 2016-01-06 | 舍弗勒技术股份两合公司 | Piston cylinder, clutch release system |
| DE102015204676A1 (en) * | 2015-03-16 | 2016-09-22 | Schaeffler Technologies AG & Co. KG | Arrangement of annular piston and groove seal for slave cylinder clutch actuators |
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| US3848518A (en) * | 1972-09-14 | 1974-11-19 | Gen Motors Corp | Sheet metal piston for transmissions and method of making a piston assembly |
| US4601374A (en) * | 1982-04-22 | 1986-07-22 | Federal-Mogul Corporation | Hydraulic clutch piston and seal |
| US6719298B2 (en) * | 2002-01-14 | 2004-04-13 | Skf Usa Inc. | Bonded piston seal for power steering |
| DE102009056899B4 (en) * | 2008-12-22 | 2019-06-06 | Schaeffler Technologies AG & Co. KG | clutch release |
| CA2847760C (en) * | 2014-03-28 | 2016-10-11 | Westport Power Inc. | Piston seal assembly with controlled leakage |
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Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1602544B1 (en) * | 2004-06-04 | 2011-01-05 | ZF Friedrichshafen AG | Hydraulic master cylinder |
| CN201843992U (en) * | 2010-11-11 | 2011-05-25 | 攀钢集团钢铁钒钛股份有限公司 | Hydraulic cylinder piston |
| DE102011088469A1 (en) * | 2010-12-22 | 2012-07-05 | Schaeffler Technologies Gmbh & Co. Kg | Master cylinder for e.g. hydraulic clutch of vehicle, has pressure chamber sealed opposite to piston and housing by primary seal that is formed on side of intermediate ring, where intermediate ring is arranged between housing and piston |
| WO2015086010A1 (en) * | 2013-12-09 | 2015-06-18 | Schaeffler Technologies AG & Co. KG | Master cylinder |
| CN204041782U (en) * | 2013-12-23 | 2014-12-24 | 浙江亚太机电股份有限公司 | A kind of clutch master cylinder assembly of integrated programmable sensor |
| CN203685928U (en) * | 2014-01-09 | 2014-07-02 | 浙江亚太机电股份有限公司 | Clutch master cylinder piston assembly for containing magnet |
| CN105221598A (en) * | 2014-06-06 | 2016-01-06 | 舍弗勒技术股份两合公司 | Piston cylinder, clutch release system |
| DE102014211430A1 (en) * | 2014-06-16 | 2015-12-17 | Schaeffler Technologies AG & Co. KG | Master cylinder for a clutch release system |
| DE102015204676A1 (en) * | 2015-03-16 | 2016-09-22 | Schaeffler Technologies AG & Co. KG | Arrangement of annular piston and groove seal for slave cylinder clutch actuators |
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| Publication number | Publication date |
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| CN109253184A (en) | 2019-01-22 |
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