JP6480149B2 - Reservoir for vehicle hydraulic master cylinder - Google Patents

Description

  The present invention relates to a reservoir of a hydraulic master cylinder for a vehicle that stores hydraulic fluid, and more specifically, follows the fluid level of the hydraulic fluid between the reservoir body and a cap that adheres to the upper opening edge of the reservoir body. The present invention relates to a reservoir for a hydraulic master cylinder for a vehicle, which includes a diaphragm to be operated and a diaphragm plate covering an upper side of the diaphragm.

  Conventionally, a reservoir of a hydraulic master cylinder for a vehicle has a diaphragm that follows the liquid level of the hydraulic fluid and a diaphragm plate that covers the upper side of the diaphragm between a cap that is attached to the upper opening edge of the reservoir body. In some cases, the cap, the diaphragm, and the diaphragm plate are attached to the reservoir body by screwing a set screw inserted through the cap, the diaphragm, and the diaphragm plate into the upper opening edge of the reservoir body. For example, see Patent Document 1.)

JP 2004-82982 A

  However, in the thing of the above-mentioned patent document 1, there exists a possibility that the sealing performance between a cap, a diaphragm, a diaphragm plate, and the opening edge of a reservoir body may fall as it distances from a set screw.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a reservoir for a hydraulic master cylinder for a vehicle in which a cap, a diaphragm, and a diaphragm plate can be satisfactorily attached to the opening edge of the reservoir main body while ensuring a sealing property.

In order to achieve the above object, the reservoir of the hydraulic master cylinder for a vehicle according to the present invention has a hydraulic fluid level in the reservoir body between the reservoir body and a cap that adheres to the upper opening edge of the reservoir body. And a plurality of set screws inserted through the cap, the diaphragm plate, and the diaphragm are screwed into the upper opening edge of the reservoir body. In the reservoir of the hydraulic master cylinder for a vehicle in which the diaphragm and the diaphragm plate are attached to the upper opening edge of the reservoir body, the upper surface of the upper opening edge of the reservoir body an opening of the plurality of female screw holes for screwing the set screw is formed, adjacent the female screw hole Mounting during opening surface are respectively formed, at least one attachment surface, it is characterized in that convex portions gradually protruded in an arc shape toward the longitudinal center portion.

Further, a diaphragm that follows the liquid level of the working fluid in the reservoir body and a diaphragm plate that covers the upper side of the diaphragm are interposed between the reservoir body and a cap that adheres to the upper opening edge of the reservoir body. A plurality of set screws inserted through the cap, the diaphragm plate, and the diaphragm are screwed into the upper opening edge of the reservoir body, whereby the diaphragm and the diaphragm are attached to the upper opening edge of the reservoir body. In the reservoir of the vehicle hydraulic master cylinder to which the diaphragm plate is attached, a plurality of screw insertion holes through which the set screws are inserted are formed in the outer edge portion of the diaphragm plate facing the upper surface of the upper opening edge. on the lower surface of the outer edge portion, the mounting surface between the screw insertion hole adjacent respectively Is, at least one mounting surface, toward the longitudinal central portion, is characterized in that convex portions gradually protruded in an arc shape on the upper surface direction of the upper opening edge of the reservoir body is formed.

  The at least one mounting surface is preferably the mounting surface having the longest distance between the adjacent female screw holes or the screw insertion holes. Furthermore, it is preferable to form the convex portions on all of the plurality of mounting surfaces. Further, the height from the base end of the convex part to the thickest tip is formed to a dimension that is 1/2 or less of the thickness of the outer edge attaching part attached to the upper opening edge of the diaphragm. It is preferable.

  According to the reservoir of the hydraulic master cylinder for a vehicle of the present invention, a convex portion that gently protrudes in an arc shape is formed in at least one longitudinal central portion of the mounting surface of the upper opening edge of the reservoir body. When a plurality of set screws inserted through the cap, the diaphragm plate, and the diaphragm are screwed into the female screw hole provided in the main body, the diaphragm, the diaphragm plate, and the projection formed at a position away from the set screw Since the cap and the cap are in close contact with each other with a high surface pressure, it is possible to ensure the sealing performance between the upper opening edge of the reservoir main body, the diaphragm, the diaphragm plate, and the cap.

  In addition, a convex portion that gently protrudes in an arc shape toward the upper opening edge of the reservoir body is formed at the longitudinal center portion of at least one mounting surface of the diaphragm plate, so that the diaphragm, the diaphragm plate, and the cap When the screw is inserted into the reservoir body and screwed into the reservoir body, the diaphragm is closely attached to the upper opening edge of the reservoir body at a high surface pressure by the convex portion formed at a position away from the set screw. Therefore, it is possible to ensure the sealing performance between the upper opening edge of the reservoir main body, the diaphragm, the diaphragm plate, and the cap.

  Further, by forming the convex portion on the mounting surface having the longest distance between the adjacent female screw holes or between the screw insertion holes, at least the upper opening edge of the reservoir body at the portion where the seal performance is most deteriorated The sealing property between the diaphragm and the diaphragm plate and the cap can be ensured. Furthermore, by forming the convex portions on all of the plurality of mounting surfaces, the sealing performance between the upper opening edge of the reservoir main body, the diaphragm, the diaphragm plate, and the cap can be reliably ensured. Further, the height from the base end of the convex part to the thickest tip is formed to be 1/2 or less of the thickness of the outer edge attaching part attached to the upper opening edge of the diaphragm. Thus, even when the outer edge mounting portion of the diaphragm is strongly pressed against the convex portion during assembly, there is no possibility that the outer edge mounting portion is damaged.

It is a principal part exploded sectional view of the reservoir which shows the example of the 1st form of the present invention. It is II-II sectional drawing of FIG. It is a top view of the reservoir body which shows the 1st example of an embodiment of the present invention. It is IV-IV sectional drawing of FIG. 1 is a plan view of a hydraulic master cylinder device showing a first embodiment of the present invention. It is principal part explanatory drawing of the reservoir | reserver which shows the 2nd form example of this invention.

  The first embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 4 and FIG. 5, the front brake fluid that combines the hydraulic master cylinder 2 and the operation lever 3 is disposed on the right side of the handlebar 1 that steers the front wheel at the front of the vehicle body of the bar handle vehicle. A pressure master cylinder device 4 is attached. In the hydraulic master cylinder 2, a reservoir 6 is integrally attached to an upper portion of a cylinder body 5 disposed substantially along the handle bar 1, and a bottomed cylinder hole 5a provided by opening one end of the cylinder body 5 is provided. The piston 7 is inserted in a fluid-tight and movable manner, and the hydraulic pressure defined on the bottom side of the cylinder hole 5a by pushing the piston 7 toward the bottom of the cylinder hole 5a by the operation of the operation lever 3. A hydraulic pressure is generated in the chamber 8.

  The cylinder body 5 and the reservoir body 6a of the reservoir 6 are integrally formed of cast iron, aluminum alloy or the like, and the cylinder hole 5a and the liquid storage chamber 6b formed in the reservoir body 6a are connected to the relief port 5b and the supply port. The hydraulic fluid in the liquid storage chamber 6b is replenished to the cylinder hole 5a as needed, or a part of the hydraulic fluid in the cylinder hole 5a is returned to the liquid storage chamber 6b.

  The reservoir 6 moves the diaphragm plate 10 and the diaphragm 11 up and down between a reservoir body 6a having the liquid storage chamber 6b for storing hydraulic fluid and a cap 9 that covers the upper opening edge 6c of the reservoir body 6a. Three set screws 12 which are superposed and inserted through the cap 9 and the diaphragm plate 10 are screwed onto the upper surface of the reservoir body 6a, and these are integrally attached to the reservoir body 6a.

  The reservoir body 6a is formed in a substantially pentagonal shape in plan view that is long in the axial direction of the cylinder hole 5a, and has one corner provided on the cylinder hole bottom side of the upper opening edge 6c and 2 provided on the cylinder hole opening side. Female screw holes 6d, 6e, and 6f into which the set screws 12 are screwed are formed at one corner. Further, the upper opening edge 6c includes a female screw hole 6d formed on the cylinder hole opening side and a female screw hole 6e formed on the cylinder hole bottom side, and the other formed on the cylinder hole opening side. A long mounting surface 6g, 6g is formed between the female screw hole 6f and the female screw hole 6e formed on the bottom side of the cylinder hole, and two female screw holes 6d, 6f formed on the cylinder hole opening side. A short mounting surface 6h is formed between them. Furthermore, a convex portion 6i that gently protrudes in an arc shape is formed at the longitudinal center of the long attachment surfaces 6g, 6g.

  The cap 9 is made of cast iron or aluminum alloy, the diaphragm plate 10 is made of a hard synthetic resin, and the diaphragm 11 has the same shape as the upper opening edge 6c of the reservoir body 6a by a flexible material such as synthetic rubber. The cylinder holes 5a are formed in a substantially pentagonal shape that is long in the axial direction. The cap 9 is formed with a screw insertion hole 9b with a countersink surface 9a at a position corresponding to each female screw hole 6d, 6e, 6f of the reservoir body 6a.

  The diaphragm plate 10 has a vent hole 10a in the center, and a pair of reinforcing ribs 10b, 10b projecting into the liquid storage chamber 6b around the vent hole 10a. Further, a screw insertion hole 10d is formed in the outer edge portion 10c of the diaphragm plate 10 at a position corresponding to each of the female screw holes 6d, 6e, 6f, and inside the screw insertion hole 10d, the reservoir main body 6a is provided. A guide rib 10e that projects along the shape of the inner wall and guides the deformation of the diaphragm 11 is formed.

  The diaphragm 11 is provided at an outer edge attaching portion 11a that is placed and attached to the upper opening edge 6c of the reservoir body 6a, a bellows portion 11b that is suspended from the outer edge attaching portion 11a, and a lower end of the bellows portion 11b. A plate-like liquid level contact portion 11c that follows the liquid level of the hydraulic fluid is provided. The outer edge attaching portion 11a is formed thicker than the bellows portion 11b and the liquid surface contact portion 11c, and the height dimension from the base end portion of the convex portion 6i formed on the reservoir body 6a to the tip portion having the largest thickness. H1 is formed to have a dimension of 1/2 or less of the thickness dimension H2 of the outer edge mounting portion 11a of the diaphragm 11. In addition, screw insertion holes 11d are respectively formed at positions corresponding to the female screw holes 6d, 6e, 6f of the outer edge mounting portion 11a.

  The cap 9, the diaphragm plate 10 and the diaphragm 11 are stacked one above the other, the screw insertion holes 9b, 10d and 11d are set coaxially, the set screw 12 is inserted from above, and the male screw portion 12a of the set screw 12 Are screwed into the female screw holes 6d, 6e, 6f, respectively, and the head 12b of the set screw 12 is brought into contact with the countersink surface 9a of the cap 9, whereby the cap 9, the diaphragm plate 10 and the diaphragm 11 are connected to the reservoir body. It is attached to the upper opening edge 6c of 6a. At this time, the outer edge mounting portion 11a of the diaphragm 11, the outer edge portion 10c of the diaphragm plate 10, and the inner surface of the outer edge side of the cap 9 are in close contact with the convex portion 6i of the reservoir body 6a with a high surface pressure. The sealing property between the opening edge 6c, the diaphragm 11, the diaphragm plate 10, and the cap 9 can be ensured. Moreover, by forming the height dimension H1 from the base end part of the convex part 6i to the tip part which is the thickest to a dimension of 1/2 or less of the thickness dimension H2 of the outer edge mounting part 11a of the diaphragm 11, Even when the outer edge mounting portion 11a of the diaphragm 11 is strongly pressed against the convex portion 6i during assembly, there is no possibility that the outer edge mounting portion 11a is damaged.

  FIG. 6 shows a second embodiment of the present invention. Components that are the same as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The upper opening edge 6j of the reservoir body 6a of this embodiment is formed in a flat shape. Diaphragm plate 10 is formed with two attachment surfaces 10f each having an elongated shape, with attachment surfaces 10f being attached to upper opening edge 6j via diaphragm 11 between adjacent screw insertion holes 10d of outer edge portion 10c. A convex portion 10g that gently protrudes in an arc shape toward the upper opening edge 6j of the reservoir body 6a is formed at the center in the longitudinal direction.

  In this embodiment, like the first embodiment, the cap 9, the diaphragm plate 10 and the diaphragm 11 are stacked one above the other, the screw insertion holes 9b, 10d and 11d are set coaxially, and the set screw 12 is mounted from above. The cap 9, the diaphragm plate 10, and the diaphragm 11 are attached to the upper opening edge 6j of the reservoir body 6a by inserting the male screw portion 12a of the set screw 12 into the female screw holes 6d, 6e, 6f. At this time, the convex portion 10g of the diaphragm plate 10 is brought into close contact with the upper opening edge 6j of the reservoir body 6a through the outer edge mounting portion 11a of the diaphragm 11 with a high surface pressure, so that the upper opening edge 6j of the reservoir body 6a The sealing performance with the diaphragm 11, the diaphragm plate 10 and the cap 9 can be ensured.

  In addition, this invention is not restricted to each above-mentioned form example, What provided the convex part only in any one attachment surface or what provided in all the attachment surfaces may be sufficient. Further, the shape of the reservoir may be any shape such as a rectangular shape, a square shape, or a circular shape in plan view, and the shape of the cap, the diaphragm plate, or the diaphragm may be formed according to the shape of the reservoir. The reservoir of the present invention may be provided separately on the upper part of the cylinder body, or the reservoir body may be formed of resin. Furthermore, the shape and material of the cap, the diaphragm plate, and the diaphragm are arbitrary.

DESCRIPTION OF SYMBOLS 1 ... Handlebar, 2 ... Hydraulic master cylinder, 3 ... Operation lever, 4 ... Hydraulic master cylinder device, 5 ... Cylinder body, 5a ... Cylinder hole, 5b ... Relief port, 5c ... Supply port, 6 ... Reservoir, 6a ... reservoir body, 6b ... reservoir chamber, 6c ... upper opening edge, 6d, 6e, 6f ... female screw hole, 6g, 6h ... mounting surface, 6i ... convex part, 6j ... upper opening edge, 7 ... piston, 8 ... liquid Pressure chamber, 9 ... Cap, 9a ... Countersink surface, 9b ... Screw insertion hole, 10 ... Diaphragm plate, 10a ... Vent hole, 10b ... Reinforcement rib, 10c ... Outer edge part, 10d ... Screw insertion hole, 10e ... Guide rib, 10f ... mounting surface, 10g ... convex part, 11 ... diaphragm, 11a ... outer edge attaching part, 11b ... bellows part, 11c ... liquid surface contact part, 11d ... screw insertion hole, 12 ... set screw, 12a ... male screw part, 1 a ... head

Claims (6)

Between the reservoir body and a cap attached to the upper opening edge of the reservoir body, a diaphragm that follows the liquid level of the working fluid in the reservoir body and a diaphragm plate that covers the upper side of the diaphragm are interposed. A plurality of set screws inserted through the cap, the diaphragm plate, and the diaphragm are screwed to the upper opening edge of the reservoir body, whereby the diaphragm and the diaphragm plate are attached to the upper opening edge of the reservoir body. In the reservoir of the hydraulic master cylinder for vehicles with
The upper surface of the upper opening edge of the reservoir body, with the opening of a plurality of female screw holes for screwing the plurality of set screws are formed, surface Mounting during opening of the adjacent female screw hole is formed, respectively And
A reservoir of a hydraulic master cylinder for a vehicle, wherein a convex portion that gently protrudes in an arc shape toward the central portion in the longitudinal direction is formed on at least one mounting surface. Between the reservoir body and a cap attached to the upper opening edge of the reservoir body, a diaphragm that follows the liquid level of the working fluid in the reservoir body and a diaphragm plate that covers the upper side of the diaphragm are interposed. A plurality of set screws inserted through the cap, the diaphragm plate, and the diaphragm are screwed to the upper opening edge of the reservoir body, whereby the diaphragm and the diaphragm plate are attached to the upper opening edge of the reservoir body. In the reservoir of the hydraulic master cylinder for vehicles with
A plurality of screw insertion holes through which the set screw is inserted are formed in an outer edge portion of the diaphragm plate that faces the upper surface of the upper opening edge, and a lower surface of the outer edge portion has an adjacent screw insertion hole. the mounting surface is their respective formed between,
At least one attachment surface, a longitudinal direction toward the center, the upper opening edge vehicle liquid, wherein a convex portion that gradually protrudes in an arc shape is formed on the upper surface direction of the reservoir body Pressure master cylinder reservoir.   The reservoir of a hydraulic master cylinder for a vehicle according to claim 1, wherein the at least one mounting surface is a mounting surface having the longest distance between the adjacent female screw holes.   The reservoir of a hydraulic master cylinder for a vehicle according to claim 2, wherein the at least one mounting surface is a mounting surface having the longest distance between adjacent screw insertion holes.   The reservoir of a hydraulic master cylinder for a vehicle according to claim 1 or 2, wherein the convex portions are formed on all of the plurality of mounting surfaces.   The height dimension from the base end part of the convex part to the thickest tip part is formed to be a dimension of 1/2 or less of the thickness dimension of the outer edge attaching part attached to the upper opening edge of the diaphragm. A reservoir for a hydraulic master cylinder for a vehicle according to any one of claims 1 to 5.

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