JP6629091B2 - Hydraulic master cylinder reservoir tank - Google Patents

Description

  The present invention relates to a reservoir tank for storing a hydraulic fluid for operating a hydraulic master cylinder of a motorcycle or a three- or four-wheeled motor vehicle, and more particularly, to a structure of a diaphragm used for the reservoir tank.

  Conventionally, a diaphragm used for a reservoir tank of a hydraulic master cylinder has a flange portion at an outer end mounted on an upper opening edge of a reservoir body having a liquid storage chamber, and a bellows portion provided inside the flange portion. A flat portion extending inside the lower end at the center of the bellows portion and following a change in the level of the hydraulic fluid (see, for example, Patent Document 1).

Japanese Utility Model Publication No. Sho 62-80748

  However, in the diaphragm disclosed in Patent Document 1 described above, when the hydraulic path is evacuated at the time of filling the hydraulic fluid, if the diaphragm is pulled to the bottom side of the reservoir tank, the bellows extends to the bottom side of the reservoir tank. In some cases, buckling occurred, and folding bellows were formed on the bellows. When the wrinkles are generated, it is difficult for the bellows portion to return to the original shape after the filling of the working fluid, and the shape of the diaphragm may have to be manually restored by an operator after the filling of the working fluid.

  Accordingly, the present invention provides a hydraulic master capable of enhancing the restoring force of the bellows portion when filling the hydraulic fluid while evacuating the hydraulic path and automatically returning the bellows portion to its original shape after filling the hydraulic fluid. It is intended to provide a reservoir tank for a cylinder.

  In order to achieve the above object, a reservoir tank of a hydraulic master cylinder of the present invention is disposed above a cylinder hole of a hydraulic master cylinder, and communicates with the cylinder hole via a port. A cap attached to an upper opening edge via a diaphragm, wherein the reservoir body has a rectangular cross section in a horizontal direction, and the diaphragm is mounted on an upper opening edge of the reservoir body. A flange portion at the end, a bellows portion provided inside the flange portion, and formed in an uneven shape in which a concave portion and a convex portion are provided continuously, and extended inside the lower end of the bellow portion, and actuated. In a reservoir tank of a hydraulic master cylinder including a flat portion that follows a change in the liquid level of the liquid, the diaphragm includes a thick reinforcing portion formed with a large thickness in a part of the bellows portion. It is characterized in that digit.

  Further, it is preferable that the thickness reinforcing portion is formed by building up a side surface of the cap of the convex portion. Furthermore, the bellows portion includes a straight portion formed linearly inside the flange portion, and a bent portion connecting the straight portions, and the thick portion is provided in the straight portion, and the bent portion is provided. It is preferable to provide a constricted portion that is concave toward the reservoir body.

  Further, a reservoir body disposed above the cylinder hole of the hydraulic pressure master cylinder and communicating with the cylinder hole via a port, and a cap attached to an upper opening edge of the reservoir body via a diaphragm, The reservoir main body has a horizontal cross section formed in a polygonal shape, and a plurality of bosses for mounting a connection bolt for connecting the reservoir main body, the diaphragm and the cap to the inner wall are protrudingly provided on the inner wall, and the diaphragm is provided. A bellows formed at an outer end mounted on an upper opening edge of the reservoir body, and a bellows formed inside the flange portion and formed with a concave portion and a convex portion continuously provided And a flat portion extending inside the lower end of the bellows portion and following a change in the level of the hydraulic fluid. Ram, a portion of the bellows part, is characterized in that a thick reinforcing portion is formed thick wall thickness.

  It is preferable that the thickness reinforcing portion is formed by building up the side surface of the cap of the convex portion. Further, the bellows portion includes a straight portion formed linearly along the inside of the straight portion of the upper opening edge, and a bent portion formed by bending along the inside of each of the bosses, It is preferable that the thickness reinforcing portion is provided in the linear portion. Further, it is preferable that the bellows portion is provided with the thick reinforcing portion at a central portion of the bent portion disposed inside the boss portion having the longest distance between the adjacent boss portions.

  According to the reservoir tank of the hydraulic master cylinder of the present invention, by forming a thick reinforcing portion at a part of the bellows portion of the diaphragm mounted on the reservoir body having a horizontal cross section in the shape of a square, when filling the working fluid, When the hydraulic path is evacuated, even if the diaphragm is pulled to the bottom side of the reservoir tank, the thickening portion promotes the restoring force of the bellows, and the bellows automatically returns to its original shape after filling with hydraulic fluid. Because of the return, the workability at the time of filling the working fluid can be improved.

  In addition, the thickness reinforcing portion is formed by building up the side surface of the cap of the convex portion of the bellows portion, so that the thickness reinforcing portion according to the height of the bellows portion (the height of the convex portion). In particular, when the height of the bellows portion is high, the area of the thick reinforcing portion can be increased, so that the bellows portion can be properly returned to the original shape after filling the working fluid. it can. Further, the bellows portion includes a straight portion formed inside the flange portion and a bent portion connecting the straight portions, and the thick portion is provided in the straight portion, and the bent portion has a concave shape toward the reservoir body side. By providing the constricted portion, the restoring force of the linear portion can be promoted, and the constricted portion makes it difficult for the bent portion to fold and wrinkle at the time of evacuation. Can be satisfactorily returned to the original shape.

  Furthermore, according to the reservoir tank of the hydraulic master cylinder of the present invention, the hydraulic fluid is formed by forming a thick reinforcing portion at a part of the bellows portion of the diaphragm mounted on the reservoir body having a polygonal horizontal section. When the hydraulic path is evacuated during filling, even if the diaphragm is pulled to the bottom side of the reservoir tank, the resilience of the bellows is promoted by the thickened reinforcement, and the bellows automatically returns to its original shape after filling with hydraulic fluid. Since the operation is restored, the workability at the time of filling the working fluid can be improved. More specifically, at the time of evacuation, by providing a thick reinforcing portion on both sides of a place where folds are likely to occur, the folds can be returned to the original shape after filling the working fluid, and the entire diaphragm can be formed. It can be automatically returned to the original shape. In addition, the bellows portion has a portion formed to have a normal thickness (for example, a thickness equivalent to a flat portion) without the thickness reinforcing portion, so that when the hydraulic master cylinder is operated, The bellows portion can be appropriately expanded and contracted with the change in the liquid level of the working fluid, so that the flat portion can favorably follow the liquid level.

  Further, the bellows portion includes a straight portion formed linearly along the inside of the straight portion of the upper opening edge of the reservoir tank, and a bent portion formed by bending along the inside of each boss portion, By providing a thick reinforcing part on the straight part, the bellows part can be restored to its original shape after filling with hydraulic fluid by the thick reinforcing parts provided on both sides of the bent part where folding wrinkles are likely to occur during evacuation. Can be restored.

  In addition, the bellows portion has a thick reinforcing portion at the center of the bent portion disposed inside the boss portion having the longest distance between the adjacent boss portions, in addition to the straight portion, so that the bellows portion is particularly wrinkled. The central portion of the bent portion where the occurrence of the wrinkles easily occurs is reinforced, and the bellows portion can be more reliably returned to the original shape after filling the working fluid. In addition, since both end portions of the thick reinforcing portion provided at the center of the bent portion are formed to have a normal thickness, even if the thick reinforcing portion is formed at the bent portion, the flat portion of the hydraulic fluid can be formed. There is no danger of bearing on the follow-up performance.

It is II sectional drawing of FIG. It is a top view of the diaphragm which shows the 1st form example of this invention. FIG. 3 is a sectional view taken along line III-III of FIG. 2. It is a partial section perspective view of the diaphragm showing the 1st example of the present invention. It is a top view of the hydraulic master cylinder device similarly. It is VI-VI sectional drawing of FIG. It is a top view of the diaphragm which shows the 2nd form example of this invention. FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 7. It is a partial section perspective view of the diaphragm which shows the 2nd form example of the present invention. It is a top view of the hydraulic master cylinder device similarly.

  FIGS. 1 to 5 show a first embodiment of the present invention. A hydraulic master cylinder 2 and an operation lever 3 are provided on the right side of a handlebar 1 for steering a front wheel at the front of a vehicle body of a bar handle vehicle. The hydraulic master cylinder device 4 for the front brake which combines the above is mounted. The hydraulic master cylinder 2 has a bottomed cylinder hole 2b formed by integrally mounting a reservoir tank 5 on an upper portion of a cylinder body 2a disposed substantially along the handlebar 1 and opening one end of the cylinder body 2a. , A piston 2c is inserted in a liquid-tight and movably manner, and when the operating lever 3 is squeezed, the piston 2c is pushed toward the bottom of the cylinder hole 2b, and the hydraulic pressure provided at the bottom of the cylinder hole 2b is increased. A hydraulic pressure is generated in the chamber 6.

  The reservoir tank 5 vertically moves a diaphragm plate 8 and a diaphragm 9 between a reservoir body 5b having a reservoir chamber 5a for storing a hydraulic fluid and a cap 7 covering an upper opening edge 5c of the reservoir body 5b. After polymerization, the two setscrews 10 inserted through the cap 7, the diaphragm plate 8 and the diaphragm 9 are screwed to the upper surface of the reservoir body 5b, and these are integrally attached to the reservoir body 5b.

  The cylinder body 2a and the reservoir body 5b are integrally formed of cast iron, an aluminum alloy, or the like, and communicate the cylinder hole 2b and the liquid storage chamber 5a with the relief port 11 and the supply port 12 (the port of the present invention). Thus, the working fluid in the liquid storage chamber 5a is supplied to the cylinder hole 2b as needed, or a part of the working liquid in the cylinder hole 2b is returned to the liquid storage chamber 5a.

  The reservoir body 5b has a horizontal cross section formed in a rectangular shape that is long in the axial direction of the handlebar 1, and is provided with a pair of bosses 5d, 5d protruding inward at the center of the inner wall on the short side, respectively. In each boss 5d, a female screw hole 5e for attaching a cap is provided with an opening on the upper surface.

  The cap 7, the diaphragm plate 8, and the diaphragm 9 are formed in a rectangular shape in plan view that is substantially the same shape as the upper opening edge 5 c of the reservoir body 5 b and is long in the axial direction of the handlebar 1. The cap 7 is provided with a tapered counterbore-faced screw insertion hole 7a at the same position as the female screw holes 5e of the reservoir body 5b. The diaphragm plate 8 has a vent hole 8a at the center, and a screw insertion hole 8c for inserting the set screw 10 is formed at a position corresponding to the female screw hole 5e formed in the reservoir body 5b on the outer edge 8b.

  The diaphragm 9 is provided at an outer end flange portion 9a placed on the upper opening edge 5c of the reservoir body 5b, a bellows portion 9b provided inside the flange portion 9a, and provided inside a lower end of the bellows portion 9b, A flat portion 9c that follows a change in the level of the hydraulic fluid is provided, and a screw insertion hole 9d is formed at a position of the flange portion 9a corresponding to each female screw hole 5e of the reservoir body 5b. In addition, horseshoe-shaped reinforcing ribs 9e, 9e are provided on the upper surface of the flat portion 9c.

  The bellows portion 9b is formed in an uneven shape in which a concave portion 9f and a convex portion 9g are continuously provided, and a concave portion 9f is provided on the outside and a convex portion 9g is provided on the inside. In addition, the protruding portion 9g has long side portions 9h, 9h (linear portions of the present invention) and short side portions 9i, 9i (of the present invention) formed inside the linear portion of the flange portion 9a in parallel with the linear portion. (A straight line portion) and four bent portions 9j connecting the long side portion 9h and the short side portion 9i. A thick reinforcing portion R1 formed by building up the side surface of the cap of the convex portion 9g is provided on a part of the long side portion 9h and the short side portion 9i. Further, in each bent portion 9j, a constricted portion 9k that is concave toward the reservoir body is formed by gradually reducing the height of the convex portion 9g toward the corner.

  This embodiment is formed as described above. Therefore, even when the diaphragm 24 is pulled to the bottom side of the reservoir tank 21 and the bellows portion 9b is extended when the hydraulic path is evacuated at the time of filling the working fluid, the bellows portion 9b is extended. The reinforce force of the bellows portion 9b is promoted by the thickness reinforcing portion R2 formed in the above, and the bellows portion 9b automatically returns to the original shape after filling the working fluid, so that the workability at the time of filling the working fluid is improved. Can be planned. Further, the constricted portion 9k in which the height of the convex portion 9g of the bent portion 9j is gradually reduced toward the corner portion makes it difficult for the bent portion 9j to be deformed at the time of evacuation. Can be suppressed, and the bellows portion 9b can be more reliably automatically returned to the original shape after filling the working fluid. Further, the constricted portion 9k allows the entire diaphragm 9 to be smoothly stretched toward the tank bottom during vacuum evacuation. In addition, the bellows portion 9b has a portion formed with a normal thickness (for example, the same thickness as the flat portion 9c) without the thickness reinforcing portion R1, so that the hydraulic master cylinder 2 During the operation of, the bellows portion 9b can be appropriately expanded and contracted in accordance with a change in the liquid level of the working fluid, so that the flat portion 9c can favorably follow the liquid level.

  Also, if the mounting rigidity of the entire diaphragm is not well-balanced, the bellows portion of the lower mounting rigidity is located ahead of the bellows portion of the higher mounting rigidity when the hydraulic path is evacuated when filling the working fluid. It deforms (that is, it is stretched first), and after filling with hydraulic fluid, it returns to the original shape from the bellows part of the high mounting rigidity, contrary to the vacuum evacuation, and the bellows part of the low mounting rigidity becomes It is difficult to return to the original shape by being pulled by the bellows part of the part with high attachment rigidity. In the diaphragm 9 of the present embodiment, the mounting rigidity is higher at a portion closer to the pair of screw insertion holes 9d, 9d screwed to the boss portion 5d of the reservoir tank 5, but the pair of screw insertion holes 9d, 9d is formed by the diaphragm. 9 are formed at symmetrical positions with respect to the center line L1 in the longitudinal direction and the center line L2 in the short direction, respectively, and the bellows portion 9b between the pair of screw insertion holes 9d, 9d is provided with the thick reinforcing portion R1. Since the constricted portion 9k is formed at a symmetrical position with respect to the center lines L1 and L2, the rigidity balance of the entire diaphragm is good, and at the time of evacuation, the entire bellows portion is stretched almost simultaneously, After filling the working fluid, the entire bellows portion can return to the original shape almost simultaneously, and there is no portion that is difficult to return to the original shape.

  6 to 10 show a second embodiment of the reservoir tank of the hydraulic master cylinder according to the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals, respectively. Detailed description is omitted.

  The reservoir tank 21 of the hydraulic master cylinder device 20 of the present embodiment is provided between a reservoir body 21b having a storage chamber 21a for storing a hydraulic fluid and a cap 22 covering an upper opening edge 21c of the reservoir body 21b. The diaphragm plate 23 and the diaphragm 24 are vertically overlapped, and three setscrews 25 inserted through the cap 22, the diaphragm plate 23, and the diaphragm 24 are screwed onto the upper surface of the reservoir body 21b, and these are screwed to the reservoir body 21b. It is attached to one.

  The cylinder body 2a and the reservoir body 21b are integrally formed of cast iron, an aluminum alloy, or the like, and the cylinder hole 2b and the liquid storage chamber 21a communicate with the relief port 11 and the supply port 12 (the port of the present invention). Thus, the working fluid in the liquid storage chamber 21a is supplied to the cylinder hole 2b as needed, or a part of the working liquid in the cylinder hole 2b is returned to the liquid storage chamber 21a.

  The reservoir main body 21b is formed in a pentagonal shape having a horizontal cross section that is long in the axial direction of the handlebar 1, and has three bosses 21d, 21e, and 21f protruding inward on the inner wall. , 21e and 21f are provided with female screw holes 21g for attaching caps, each of which is open on the upper surface. The boss 21d is located at a corner of the reservoir body 21b that projects to the right of the vehicle body at the center in the vehicle longitudinal direction, the boss 21e is located at a corner of the reservoir body 21b that projects to the left of the vehicle behind the vehicle, The boss portion 21d is provided slightly to the right of the vehicle body than the front corner portion adjacent to the boss portion 21e, and the boss portion 21d has the longest distance between the adjacent boss portions (the other two boss portions 21e and 21f). Away from you.).

  The cap 22 is made of cast iron or an aluminum alloy, the diaphragm plate 23 is made of a hard synthetic resin, and the diaphragm 24 is made of a flexible material such as synthetic rubber, and has substantially the same shape as the upper opening edge 21c of the reservoir body 21b. The handlebar 1 is formed in a pentagonal shape in plan view that is long in the axial direction. The cap 22 has a screw insertion hole 22a having a tapered counterbore face formed at the same position as each of the female screw holes 21g of the reservoir body 21b.

  The diaphragm plate 23 has a ventilation hole in the center, and screw insertion holes 23b for inserting the set screw 25 are formed at positions corresponding to the female screw holes 21g formed in the reservoir body 21b on the outer edge 23a. Further, a guide rib 23c is formed on the outer edge portion 23a so as to be disposed inside the inner wall of the reservoir body 21b along the shape of the inner wall, protrude downward, and guide the deformation of the diaphragm 24.

  The diaphragm 24 is provided at an outer end flange portion 24a placed on the upper opening edge 21c of the reservoir body 21b, a bellows portion 24b provided inside the flange portion 24a, and provided at a lower end inside the bellows portion 24b, A flat portion 24c that follows a change in the level of the hydraulic fluid is provided, and screw insertion holes 24d are respectively formed in the flange portion 24a at positions corresponding to the female screw holes 21g of the reservoir body 21b. The bellows portion 24b is formed in a concavo-convex shape in which a concave portion 24e and a convex portion 24f are continuously provided, and a concave portion 24e is provided on the outside and a convex portion 24f is provided on the inside.

  The bellows portion 24b is formed along the shape of the upper opening edge 21c of the reservoir body 21b, and a plurality of straight portions 24g formed linearly along the inside of the straight portion of the upper opening edge 21c, and the boss portion 21d. A first bent portion 24h formed to be concavely curved toward the inside of the reservoir body along the inside, and a second bent portion formed to be concavely curved toward the inside of the reservoir body along the inside of the boss 21e. And a third bent portion 24j formed to be concavely curved toward the inside of the reservoir body along the inside of the boss portion 21f. The bellows portion 24b is provided with a thick reinforcing portion R2 at a part of the plurality of straight portions 24g and at a central portion of the first bent portion 24h, and the thick reinforcing portion R2 is provided on the side of the cap of the convex portion 24f. It is formed by overlaying. In addition, both ends of the first bent portion 24h, the second bent portion 24i, the third bent portion 24j, a part of the straight portions 24g, 24g continuous on both sides of the third bent portion 24j, and the first bent portion The thickness reinforcing portion R2 is not provided at the center of the longest straight portion 24g formed between the second bent portion 24i and the center portion 24h, and has a normal thickness (for example, the same thickness as the flat portion 24c). Is formed.

  The hydraulic master cylinder 2 formed in this manner is capable of holding the bellows portion 24b even when the diaphragm 24 is pulled to the bottom side of the reservoir tank 5 and the bellows portion 24b extends when the hydraulic path is evacuated when filling the working fluid. The formed thickness reinforcing portion R2 promotes the restoring force of the bellows portion 24b, and the bellows portion 24b automatically returns to its original shape after filling with the working fluid, thereby improving workability at the time of filling the working fluid. be able to. In the diaphragm 24 of the present embodiment, although the first bent portion 24h, the second bent portion 24i, and the third bent portion 24j are liable to be wrinkled during the evacuation, the linear portions on both sides of the first bent portion 24h. 24g, the straight portions 24g on both sides of the second bent portion 24i, and the straight portions 24g on both sides of the third bent portion 24j are provided with the thick reinforcing portions R2, respectively, so that the first bent portion 24h and the second bent portion 24i are provided. Even if the third bent portion 24j has a wrinkle, the bellows portion 24b can be automatically returned to the original shape after filling the working fluid. Further, the first bent portion 24h disposed inside the boss portion 21d having the longest distance between the adjacent boss portions is particularly prone to fold wrinkles, but the center portion of the first bent portion 24h is also thick. By providing the reinforcing portion R2, the bellows portion 24b can be more reliably returned to the original shape after filling the working fluid. Thereby, the workability at the time of filling the working fluid can be improved.

  In addition, both ends of the first bent portion 24h, the second bent portion 24i, the third bent portion 24j, a part of the straight portions 24g and 9g continuous on both sides of the third bent portion 24j, and the first bent portion Since the thickening portion R2 is not provided at the central portion of the longest straight portion 24g formed between the second bent portion 24i and the second bent portion 24i and is formed to have a normal thickness, the hydraulic master cylinder is formed. At the time of the operation 2, the bellows portion 24b can be expanded and contracted so that the flat portion 24c can favorably follow the level change of the working fluid.

  Further, in the diaphragm 24 of the present embodiment, since the intervals between the bosses 21d, 21e, and 21f of the reservoir tank 21 are not uniform, the screw insertion holes 24d attached to the bosses 21d having the longest distance between the adjacent bosses. Although the mounting rigidity is low in the portion close to (a portion on the right side of the diaphragm 24 shown in FIG. 7), since the thick reinforcing portion R2 is provided much in the low mounting rigidity portion, the rigidity balance of the entire diaphragm can be reduced. The bellows can be stretched almost simultaneously at the time of evacuation, and the entire bellows can return to its original shape almost simultaneously after filling with hydraulic fluid. There are no difficult parts.

  In the present invention, as in each of the above embodiments, the shape of the reservoir body is not limited to a horizontal cross section of not only a pentagon or a quadrangle but also a triangle, or may be a pentagon or more, and the diaphragm also depends on the shape of the reservoir body. It is good to make it the outside shape. In addition, the thickness reinforcing portion is not limited to one formed by building up the side surface of the cap of the convex portion, and may be formed at any portion of the bellows portion. Further, the hydraulic master cylinder is not limited to the above-described embodiment, and may be of a tandem type, may be provided with a separate reservoir tank at the top of the cylinder body, or may have a reservoir body formed of resin. . Further, the reservoir tank may not be provided with a diaphragm plate.

DESCRIPTION OF SYMBOLS 1 ... Handlebar, 2 ... Hydraulic master cylinder, 2a ... Cylinder body, 2b ... Cylinder hole, 2c ... Piston, 3 ... Operating lever, 4 ... Hydraulic master cylinder device, 5 ... Reservoir tank, 5a ... Liquid storage chamber, 5b: Reservoir body, 5c: Upper opening edge, 5d: Boss portion, 5g: Female screw hole, 6: Hydraulic chamber, 7: Cap, 7a: Screw insertion hole, 8: Diaphragm plate, 8a: Vent hole, 8b: Outer edge Part, 8c: screw insertion hole, 9: diaphragm, 9a: flange, 9b: bellows part, 9c: flat part, 9d: screw insertion hole, 9e: reinforcing rib, 9f: concave part, 9g: convex part, 9h ... Long side, 9i Short side, 9j Bent, 9k Neck, 10 Set screw, 11 Relief port, 12 Supply port, 20 Hydraulic master cylinder device, 21 Reservoir tank, 21a Liquid storage 21b: Reservoir body, 21c: Upper opening edge, 21d, 21e, 21f: Boss, 21g: Female screw hole, 22: Cap, 22a: Screw insertion hole, 23: Diaphragm plate, 23a: Outer edge, 23b: Screw insertion Hole, 23c: guide rib, 24: diaphragm, 24a: flange portion, 24b: bellows portion, 24c: flat portion, 24d: screw insertion hole, 24e: concave portion, 24f: convex portion, 24g: straight portion, 24h: first 1 bent portion, 24i: second bent portion, 24j: third bent portion, 25: set screw, R1, R2: thick reinforcing portion

Claims (7)

A reservoir body disposed above the cylinder hole of the hydraulic master cylinder and communicating with the cylinder hole via a port, and a cap attached to the upper opening edge of the reservoir body via a diaphragm,
The reservoir body has a horizontal cross section formed in a square shape, and the diaphragm has an outer end flange portion mounted on an upper opening edge of the reservoir body, and a concave portion provided inside the flange portion. And a convex portion are provided continuously, and a bellows portion formed in an uneven shape, and a flat portion extending inside the lower end of the bellows portion and following a change in the liquid level of the hydraulic fluid, In the reservoir tank of the master cylinder,
The diaphragm is provided with a thick reinforcing portion formed in a thicker thickness on a part of the bellows portion ,
The reservoir tank of a hydraulic master cylinder , wherein the thickness reinforcing portion is formed by building up a side surface of the cap of the convex portion . The bellows portion includes a straight portion formed linearly inside the flange portion, and a bent portion connecting the straight portions, and the thickness reinforcing portion is provided in the straight portion, and the bent portion has a reservoir tank of the hydraulic master cylinder according to claim 1, characterized in that a constricted portion becomes concave toward the reservoir body. A reservoir body disposed above the cylinder hole of the hydraulic master cylinder and communicating with the cylinder hole via a port, and a cap attached to the upper opening edge of the reservoir body via a diaphragm,
The reservoir body has a horizontal cross section formed in a square shape, and the diaphragm has an outer end flange portion mounted on an upper opening edge of the reservoir body, and a concave portion provided inside the flange portion. And a convex portion are provided continuously, and a bellows portion formed in an uneven shape, and a flat portion extending inside the lower end of the bellows portion and following a change in the liquid level of the hydraulic fluid, In the reservoir tank of the master cylinder,
The diaphragm is provided with a thick reinforcing portion formed in a thicker thickness on a part of the bellows portion,
The bellows portion includes a straight portion formed linearly inside the flange portion, and a bent portion connecting the straight portions, and the thick portion is provided in the straight portion, and the bent portion has a reservoir tank of the hydraulic pressure master cylinder you characterized in that toward the reservoir body provided with a constricted portion becomes concave. A reservoir body disposed above the cylinder hole of the hydraulic master cylinder and communicating with the cylinder hole via a port, and a cap attached to the upper opening edge of the reservoir body via a diaphragm,
The reservoir main body has a horizontal cross section formed in a polygonal shape, and a plurality of bosses for mounting a connection bolt for connecting the reservoir main body, the diaphragm, and the cap are protruded on an inner wall,
The diaphragm is formed in an uneven shape in which a flange portion at an outer end placed on an upper opening edge of the reservoir body and provided inside the flange portion, and a concave portion and a convex portion are provided continuously. A reservoir tank of a hydraulic master cylinder having a bellows portion and a flat portion extending inside the lower end of the bellows portion and following a change in the level of the hydraulic fluid.
The diaphragm is provided with a thick reinforcing portion formed in a thicker thickness on a part of the bellows portion ,
The reservoir tank of a hydraulic master cylinder , wherein the thickness reinforcing portion is formed by building up a side surface of the cap of the convex portion . The bellows portion includes a straight portion formed linearly along the inside of the straight portion of the upper opening edge, and a bent portion formed by being bent along the inside of each of the bosses. 5. The reservoir tank for a hydraulic master cylinder according to claim 4 , wherein the wall is provided with the thickness reinforcing portion. A reservoir body disposed above the cylinder hole of the hydraulic master cylinder and communicating with the cylinder hole via a port, and a cap attached to the upper opening edge of the reservoir body via a diaphragm,
The reservoir main body has a horizontal cross section formed in a polygonal shape, and a plurality of bosses for mounting a connection bolt for connecting the reservoir main body, the diaphragm, and the cap are protruded on an inner wall,
The diaphragm is formed in an uneven shape in which a flange portion at an outer end placed on an upper opening edge of the reservoir body and provided inside the flange portion, and a concave portion and a convex portion are provided continuously. A reservoir tank of a hydraulic master cylinder having a bellows portion and a flat portion extending inside the lower end of the bellows portion and following a change in the level of the hydraulic fluid.
The diaphragm is provided with a thick reinforcing portion formed in a thicker thickness on a part of the bellows portion,
The bellows portion includes a straight portion formed linearly along the inside of the straight portion of the upper opening edge, and a bent portion formed by being bent along the inside of each of the bosses. a reservoir tank of the hydraulic pressure master cylinder you characterized by providing the thick reinforcing portion parts. The bellows portion, the central portion of the bent portion where the distance between the boss portion adjacent is placed inside the longest boss, according to claim 5 or 6, characterized in that a said thick reinforcing portion Reservoir tank for hydraulic master cylinder.

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