JP2014024420A - Hydraulic master cylinder and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic master cylinder and a manufacturing method thereof, for arranging a protector and a separator in a reservoir, by using one master cylinder casting.SOLUTION: A master cylinder casing 1 forms a thick part 7 having a thickness capable of installing a separator 4 for integrally covering an upper part of a supply board 6a and a relief board 6b and having a recessed part 2c in a central part, between a cylinder body forming part 5 and a reservoir forming part 2. The recessed part 2c is formed with a protector installing part 2e for installing the protector for covering the upper part of the relief board 6b bored-processed in a bottom plate part 2d of the recessed part 2c. When installing the protector in a liquid storage chamber 2a, the protector is installed in the protector installing part 2e. When installing the separator in a bottom part of the liquid storage chamber, a separator installing part 2g is formed by cutting-processing a sidewall 2f of the recessed part 2c, the bottom plate part 2d and the protector installing part 2e, and the separator is installed in the separator installing part 2g.

Description

  The present invention relates to a hydraulic master cylinder formed by casting and a manufacturing method thereof, and more particularly, to a reservoir integrated hydraulic master cylinder formed by integrally casting a cylinder body and a reservoir and a manufacturing method thereof.

  Conventionally, in a hydraulic master cylinder in which a reservoir is integrally formed on the upper part of the cylinder body, a cap is attached to the upper edge of the liquid storage chamber via a diaphragm, and the cylinder hole and the liquid storage chamber are separated from each other. The port and the supply port communicate with each other to replenish hydraulic fluid in the liquid storage chamber to the cylinder hole as needed, or return the hydraulic fluid in the cylinder hole to the liquid storage chamber. In such a hydraulic master cylinder, a protector that covers the upper part of the relief port is attached around the supply port of the reservoir (see, for example, Patent Document 1), and bubbles generated in the reservoir are formed in the cylinder hole. In order to prevent the inflow, there has been a type in which a separator that integrally covers the supply port and the relief port is attached (see, for example, Patent Document 2).

Japanese Utility Model Publication No. 1-85177 Japanese Utility Model Publication No.59-98101

  However, in the above-described hydraulic master cylinder, the shape of the bottom of the liquid storage chamber differs between when the protector is used for the reservoir and when the separator is used. A cylinder casting had to be formed.

  Accordingly, an object of the present invention is to provide a hydraulic master cylinder capable of arranging a protector and a separator in a reservoir using a single master cylinder casting and a method for manufacturing the hydraulic master cylinder.

  In order to achieve the above object, a hydraulic master cylinder according to the present invention includes a master cylinder cast body obtained by integrally casting a reservoir forming portion in which a liquid storage chamber is formed on an upper portion of a cylinder body forming portion in which a cylinder hole is formed. In the hydraulic master cylinder that has been processed to form a cylinder hole, a relief port, and a supply port, the master cylinder casting is formed between the cylinder body forming portion and the reservoir forming portion between the supply port and the relief port. A thick part having a thickness capable of mounting a separator that integrally covers the upper part and having a concave part toward the cylinder hole at the center part and having a shape smaller than the outer shape of the separator in plan view, is formed, The recess is formed with a protector mounting portion for mounting a protector covering the relief port on the bottom plate portion of the recess. When the protector is mounted on the bottom of the liquid storage chamber, the protector is mounted on the protector mounting portion, and when the separator is mounted on the bottom of the liquid storage chamber, the side wall of the recess and the protector are mounted. The mounting portion is cut to form a separator mounting portion, and the separator is mounted on the separator mounting portion.

  The separator has a cylindrical mounting portion and a cover portion that covers an upper surface of the mounting portion, and the concave portion has a smaller diameter than the mounting portion and gradually decreases toward the cylinder hole. It is preferable to form in a circular cross section.

  Furthermore, the manufacturing method of a hydraulic master cylinder according to the present invention processes a master cylinder casting in which a reservoir forming portion in which a liquid storage chamber is formed is integrally cast on an upper portion of a cylinder body forming portion in which a cylinder hole is formed. In the manufacturing method of the hydraulic master cylinder in which the cylinder hole, the relief port and the supply port are formed, a separator which integrally covers the supply port and the relief port between the cylinder body forming portion and the reservoir forming portion. A thick-walled portion having a concave portion in the center portion toward the cylinder hole and having a shape smaller than the outer shape of the separator in plan view, and a protector covering the relief port. A protector mounting portion for mounting, and when the protector is mounted, the protector mounting portion is attached to the protector mounting portion. When attaching the separator and attaching the separator, the side wall of the recess and the protector attaching part are cut to form a separator attaching part, and the separator is attached to the separator attaching part. Yes.

  According to the hydraulic master cylinder of the present invention, the master cylinder cast body provided with the protector mounting portion for mounting the protector can be easily processed to form the separator mounting portion, and the separator can be mounted, One master cylinder casting can be used for protector mounting and separator mounting, so that the versatility of the master cylinder casting can be improved and the cost can be reduced.

  Furthermore, the separator has a cylindrical mounting portion and a cover portion that covers the upper surface of the mounting portion, the concave portion has a smaller diameter than the mounting portion, and a cross section in the cylinder axial direction faces the cylinder hole. Since it is formed in a circular shape having a gradually decreasing diameter, the master cylinder casting can be processed into a master cylinder for a separator with as little processing as possible.

  Moreover, according to the manufacturing method of the hydraulic master cylinder of the present invention, the separator mounting portion is formed by cutting the side wall of the concave portion of the cast body of the master cylinder having the protector mounting portion for mounting the protector and the protector mounting portion. Therefore, the master cylinder cast body can be changed from the protector mounting to the separator mounting with simple processing, and the versatility of the master cylinder casting can be improved and the cost can be reduced.

It is II sectional drawing of FIG. It is a top view of the master cylinder casting which performed the basic process which shows the example of 1 form of this invention. It is a section front view of the hydraulic master cylinder which attached each part containing a protector. It is IV-IV sectional drawing of FIG. It is a section front view of a hydraulic master cylinder which attached each part containing a separator.

  FIGS. 1 to 5 show an embodiment of the present invention. In one master cylinder casting 1, as shown in FIGS. 3 and 4, a hydraulic pressure in which a protector 3 is mounted on a reservoir forming portion 2 is shown. As shown in FIG. 5, the master cylinder 21 and the hydraulic master cylinder 22 for mounting the separator 4 on the reservoir forming portion 2 can be formed.

  1 and 2 show a master cylinder cast body 1 subjected to basic processing. A reservoir forming portion 2 is integrally formed on an upper portion of a cylinder body forming portion 5 by casting. Between the cylinder body forming portion 5 and the supply port 6a and the relief port 6b, the separator 4 that covers the upper part of the supply port 6a and the relief port 6b can be attached, and the central portion is concave toward the cylinder hole side. A thick portion 7 having a concave portion 2c having a shape smaller than the outer shape in plan view of the separator 4 is formed.

  Inside the cylinder body forming portion 5, a bottomed cylinder hole 5 a is provided so as to open one side, and a union boss portion 5 b is projected on the bottom side of the cylinder hole 5 a, and a union hole is formed in the union boss portion 5 b. 5c is connected. On the opening side of the cylinder hole 5a, a mirror boss portion 5d for attaching the pack mirror, a vehicle body attachment bracket 5e attached to the handlebar, and a lever attachment arm 5f for connecting the operation lever are projected, and the mirror boss portion 5d has A female screw hole 5g for screwing the rearview mirror is formed, and an insertion hole 5h for a lever mounting bolt is formed in the lever mounting rod 5f. The cylinder hole 5a includes a small diameter portion 5i through which the piston 8 is inserted, a large diameter portion 5j when formed on the opening side, and a medium diameter portion 5k provided between the large diameter portion 5j and the small diameter portion 5i. A clip mounting groove 5m is formed in the middle diameter portion 5k.

  The reservoir forming portion 2 is formed in a rectangular parallelepiped shape, and the concave portion 2c is formed in the bottom portion 2b of the liquid storage chamber 2a. The cylinder hole 5a and the liquid storage chamber 2a are communicated with the bottom plate portion 2d of the concave portion 2c. The relief port 6b and the supply port 6a are drilled. Further, a cylindrical protector mounting portion 2e for mounting the protector 3 covering the relief port 6b is formed around the opening of the supply port 6a. The recess 2c is formed in a circular cross section having a smaller diameter than the cylindrical mounting portion 4a of the separator 4 and gradually becoming a smaller diameter toward the cylinder hole 5a.

  Next, a hydraulic master cylinder 21 in which the parts including the protector 3 are attached to the master cylinder casting 1 will be described with reference to FIGS. A piston 8 is inserted into the cylinder hole 5 a of the master cylinder casting 1. The piston 8 has cup seals 9a and 9b fitted on the cylinder hole bottom side and the cylinder hole tip side, and a hydraulic chamber 10 is defined between the cup seal 9a on the cylinder hole bottom side and the bottom wall 5n of the cylinder hole 5a. It is made. A return spring 11 is contracted between the piston 8 of the hydraulic chamber 10 and the bottom wall 5n of the cylinder hole 5a, and the piston 8 is urged toward the cylinder hole opening side by the return spring 11. The clip mounting groove 5m is provided with a clip 12 that prevents the piston 8 from coming off. A piston actuator 13 is in contact with the tip of the piston 8, and covers the protruding portion between the protruding portion of the piston 8 protruding from the opening of the cylinder hole 5a and the clip 12 when not operating. A boot 14 is provided.

  The reservoir forming unit 2 has the protector mounting unit 2e mounted with the protector 3, and the cap 17 is attached to the upper rim via the diaphragm 15 and the diaphragm plate 16, and the cap 17, the diaphragm plate 16, the diaphragm 15 and the like. Are integrally attached to the upper mouth edge of the reservoir forming part 2 by means of mounting bolts 18.

  The protector 3 includes an attachment portion 3a attached to the protector mounting portion 2e, and a cover portion 3b that rises upward from the attachment portion 3a and extends above the relief port 6b to cover the relief port 6b. The attachment portion 3a is formed in a disc shape, and a liquid passage hole 3c for communicating the supply port 6a and the liquid storage chamber 2a is formed in the center, and the protector mounting portion 2e formed in a cylindrical shape on the outer periphery. Three claw pieces 3d that engage with the inner peripheral wall are formed at equal intervals in the circumferential direction.

  Next, the hydraulic master cylinder 22 in which the parts including the separator 4 are attached to the master cylinder casting 1 will be described with reference to FIGS. 1 and 5.

  The separator 4 is provided to prevent bubbles generated in the reservoir from flowing into the cylinder hole, and a cylindrical mounting portion 4a that is mounted around the supply port 6a and the relief port 6b. The cover 4b is provided with a cover 4b that covers the upper surface of the mounting portion 4a. The cover 4b is formed with a liquid passage hole 4c that allows the supply port 6a and the relief port 6b to communicate with the liquid storage chamber 2a.

  As shown by an imaginary line A in FIG. 1, the master cylinder casting 1 has the side wall 2f of the recess 2c cut to a diameter corresponding to the outer periphery of the mounting portion 4a of the separator 4, and further, the bottom plate portion 2d of the recess 2c. Then, by cutting the protector mounting portion 2e into a flat shape, as shown in FIG. 4, a separator mounting portion 2g is formed, and the mounting portion 4a of the separator 4 is press-fitted and attached to the separator mounting portion 2g.

  Thus, in the master cylinder casting 1 of this embodiment, the protector 3 can be mounted in the reservoir as it is, and the separator 4 can be mounted in the reservoir by simple processing. The versatility of the master cylinder casting 1 can be improved, and the cost can be reduced. Furthermore, the separator 4 has a cylindrical attachment portion 4a and a cover portion 4b that covers the upper surface of the attachment portion 4a. The recess 2c has a smaller diameter than the attachment portion 4a and faces the cylinder hole 5a. Since it is formed in a circular cross-section that gradually becomes smaller in diameter, the master cylinder casting 1 can be the hydraulic master cylinder 22 on which the separator 4 is mounted with as little cutting as possible. Further, the concave portion 2c of the reservoir forming portion 2 and the protector mounting portion 2e can be integrally formed when the master cylinder casting 1 is cast, and the manufacturing cost can be reduced.

  The master cylinder casting of the present invention is not limited to the above-described embodiment, and the shape of the separator mounting portion is arbitrary, and any shape may be used as long as the recess formed in the reservoir is smaller than the separator mounting portion. Absent. Any reservoir-integrated hydraulic master cylinder can be used as long as it is formed by casting.

  DESCRIPTION OF SYMBOLS 1 ... Master cylinder casting body, 2 ... Reservoir formation part, 2a ... Storage chamber, 2b ... Bottom part, 2c ... Concave part, 2d ... Bottom plate part, 2e ... Protector mounting part, 2f ... Side wall, 2g ... Separator mounting part, 3 ... Protector, 3a ... Mounting portion, 3b ... Cover portion, 3c ... Liquid passage hole, 3d ... Claw piece, 4 ... Separator, 4a ... Mounting portion, 4b ... Cover portion, 4c ... Liquid passage hole, 5 ... Cylinder body forming portion, 5a ... Cylinder hole, 5b ... Union boss part, 5c ... Union hole, 5d ... Mirror boss part, 5e ... Car body mounting bracket, 5f ... Lever mounting arm, 5g ... Female screw hole, 5h ... Insertion hole, 5i ... Small diameter hole, 5j ... Large diameter hole, 5k ... Medium diameter hole, 5m ... Clip mounting groove, 5n ... Bottom wall, 6a ... Supply port, 6b ... Relief port, 7 ... Thick part, 8 ... Piston, 9a, 9b ... Cup seal, 10 ... Hydraulic chamber, 11 ... Return Pulling, 12 ... clip, 13 ... piston actuator, 14 ... Boot, 15 ... diaphragm, 16 ... diaphragm plate, 17 ... cap, 18 ... mounting bolts, 21, 22 ... hydraulic pressure master cylinder

Claims (3)

Hydraulic pressure that forms a cylinder hole, a relief port, and a supply port by processing a master cylinder cast body integrally casting a reservoir forming portion in which a liquid storage chamber is formed above the cylinder body forming portion in which the cylinder hole is formed In the master cylinder, the master cylinder casting has a thickness capable of mounting a separator that integrally covers the supply port and the relief port between the cylinder body forming portion and the reservoir forming portion, In addition, a thick portion having a concave portion that is concave toward the cylinder hole side at the center portion and having a shape smaller than the outer shape in plan view of the separator is formed, and in the concave portion, the bottom plate portion of the concave portion is provided above the relief port. A protector mounting portion for mounting a protector for covering is formed, and when mounting the protector on the bottom of the liquid storage chamber, When the protector is mounted on the protector mounting portion and the separator is mounted on the bottom of the liquid storage chamber, the side wall of the recess and the protector mounting portion are cut to form a separator mounting portion, and the separator A hydraulic master cylinder, wherein the separator is attached to a mounting portion. The separator has a cylindrical attachment portion and a cover portion that covers an upper surface of the attachment portion, and the concave portion has a smaller diameter than the attachment portion, and a sectional circle that gradually becomes smaller in diameter toward the cylinder hole. The hydraulic master cylinder according to claim 1, wherein the hydraulic master cylinder is formed in a shape. Hydraulic pressure that forms a cylinder hole, a relief port, and a supply port by processing a master cylinder cast body integrally casting a reservoir forming portion in which a liquid storage chamber is formed above the cylinder body forming portion in which the cylinder hole is formed In the manufacturing method of the master cylinder, the separator has a thickness capable of mounting a separator that integrally covers the supply port and the relief port between the cylinder body forming portion and the reservoir forming portion, and a central portion. Forming a thick-walled portion that is concave toward the cylinder hole side and has a concave portion that is smaller than the outer shape of the separator in plan view, and a protector mounting portion for mounting a protector that covers the upper part of the relief port. When attaching the protector to the protector attaching part and attaching the separator , Together with by cutting the side walls and the protector mount portion of the recess to form a separator mounting portion, in the separator attachment unit, a manufacturing method of a hydraulic master cylinder, characterized in that mounting the separator.

Images