JP5806188B2 - Cylinder body manufacturing method for hydraulic master cylinder - Google Patents

Description

The present invention relates to a method for manufacturing a cylinder body of a hydraulic master cylinder and a hydraulic master cylinder, and more specifically, a guide hole for guiding a plunger is provided on one end side of a cylinder body having a cylinder hole through which a plunger is inserted. about the guide producing how the cylinder body made of resin hydraulic pressure master cylinder attached to the sleeve.

  Conventionally, the outer periphery of the base end of the guide sleeve is a resin-made hydraulic master cylinder in which a guide sleeve having a guide hole for guiding the plunger is attached to one end of a cylinder body having a cylinder hole for inserting the plunger. The guide sleeve is attached to the cylinder body by forming a claw portion on the attachment portion and engaging the claw portion with a window portion provided in a guide sleeve mounting hole formed in the cylinder body. (For example, refer to Patent Document 1). Also, the guide sleeve mounting portion is inserted into the guide sleeve mounting hole, and a retaining pin bent in a U-shape is inserted into the through hole formed in the guide sleeve mounting hole to prevent the guide sleeve from coming off. (For example, refer to Patent Document 2).

JP 2002-250365 A JP 2005-125820 A

  However, in the thing of the above-mentioned patent document 1, there exists a possibility that a nail | claw part may be damaged when a guide sleeve is assembled | attached to a guide sleeve attachment hole. Moreover, in the thing of patent document 2, since the retaining pin was inserted in a through-hole, workability | operativity fell.

The present invention has no fear that parts during assembly is damaged, also aims to provide a manufacturing how the cylinder body made of resin hydraulic pressure master cylinder which can improve workability.

  In order to achieve the above object, a method for manufacturing a cylinder body of a hydraulic master cylinder according to the present invention includes a guide hole that guides the plunger on a cylinder hole opening side of a resin cylinder body having a cylinder hole through which the plunger is inserted. In the manufacturing method of a cylinder body of a hydraulic master cylinder having a guide sleeve provided with the guide sleeve, the cylinder body has a guide sleeve mounting hole larger in diameter than the cylinder hole in which the guide sleeve is mounted on the opening side of the cylinder hole. And a pair of fitting grooves that are formed on the same circumference on the opening side of the guide sleeve mounting hole and facing the central axis of the plunger, and for mounting a retaining clip, The main body is injection-molded using an outer mold and a core, and the core is inserted into the pair of fitting grooves of the main body portion that forms the inner surface of the cylinder main body. In a corresponding position, a first core having recesses that open to the end and outer periphery of the main body, respectively, and a fitting groove forming part that forms the fitting groove are disposed on the outer periphery of the recess. A pair of second cores and a pair of third cores disposed on the inner peripheral side of the recess, and after the cylinder body is injection-molded, the third core is extracted, and the second center After the child is slid to the inner peripheral side of the recess, the second core is extracted together with the first core.

  According to the method for manufacturing a cylinder main body of the hydraulic master cylinder of the present invention, after the cylinder main body is molded, the third core is extracted, and after the second core is slid to the connecting portion side of the first core, it is extracted, By extracting the first core, all the cores can be easily extracted, and a cylinder body provided with a fitting groove in the guide sleeve mounting hole can be easily manufactured.

Further, according to the hydraulic master cylinder manufactured according to the present invention, the large diameter mounting portion provided on the outer periphery of the base end portion of the guide sleeve is inserted into the guide sleeve mounting hole provided in the cylinder body, and the guide sleeve mounting By attaching a retaining clip to the fitting groove provided in the hole, the guide sleeve can be easily attached to the cylinder body, there is no risk of parts being damaged, and workability can be improved. . Furthermore, since the cylinder body and the guide sleeve are made of resin, there is no risk of corrosion. In addition, the shape of the guide sleeve mounting hole can be easily formed by a molding die, and since it is not necessary to process after molding, the cost can be reduced.

  Furthermore, by forming a groove in the cylinder axial direction on the inner peripheral wall of the cylinder hole and forming a union hole that opens in the groove on the bottom side of the cylinder hole, even if a burr occurs when the union hole is formed, In addition, the slidability of the plunger can be ensured without affecting the inner peripheral surface of the cylinder hole, and it is not necessary to deburr when forming the union hole, so that the operation cost can be reduced. .

It is II sectional drawing of FIG. It is a principal part expanded sectional view which shows one example of a hydraulic master cylinder manufactured by this invention. FIG. 3 is a sectional view taken along line III-III in FIG. 1. It is a top view of a hydraulic master cylinder similarly. It is a left view of the cylinder main body of a hydraulic master cylinder similarly. It is a perspective view of the cylinder main body of a hydraulic master cylinder similarly. It is VII-VII sectional drawing of FIG. It is a top view of the cylinder main body of a hydraulic master cylinder similarly. It is the partial cross section front view of the cylinder main body of a hydraulic master cylinder similarly. It is a right view of the cylinder main body of a hydraulic master cylinder similarly. It is explanatory drawing at the time of hydraulic pressure master cylinder shaping | molding. It is XII-XII sectional drawing of FIG. It is explanatory drawing which shows the state which extracted the 3rd core after the hydraulic master cylinder shaping | molding, and slid the 2nd core. It is explanatory drawing which shows the state which extracted the 2nd core after hydraulic pressure master cylinder shaping | molding. It is explanatory drawing which shows the state which extracted the 1st core after hydraulic pressure master cylinder shaping | molding.

FIG. 1 to FIG. 10 are hydraulic master cylinders 1 for clutches showing an embodiment according to the manufacture of the present invention. The hydraulic master cylinder 1 is formed of, for example, a synthetic resin, and a cylinder hole through which a plunger 2 is inserted. A guide sleeve 4 provided with a guide hole 4a for guiding the plunger 2 is attached to one end side of the cylinder body 3 provided with 3a. The cylinder hole 3a and the guide hole 4a are formed to have the same diameter and are coaxially arranged. Be placed.

  A concave groove 3b in the cylinder axial direction is formed on the inner peripheral wall of the cylinder hole 3a. On the bottom side of the cylinder hole 3a, a union boss portion 5 is projected, and the union boss portion 5 is formed with a union hole 5a that opens into the concave groove 3b. A hydraulic pipe 6 is connected to the union boss portion 5. Is done. A boss portion 7 having a fluid passage hole 7a communicating with the cylinder hole 3a is projected on the upper portion of the cylinder body 3, and a connector 8 connected to a reservoir (not shown) is attached to the boss portion 7. It is done. A body mounting bracket 9 is provided at the opening side end of the cylinder body 3, and two mounting bolts 10 are attached to the body mounting bracket 9. The plunger 2 is slidably inserted into the cylinder hole 3a via the first cup seal 11 and the second cup seal 12, and a hydraulic chamber is provided between the first cup seal 11 and the bottom of the cylinder hole 3a. 13 is defined.

  The cylinder body 3 includes a small-diameter cylinder hole 3a, a large-diameter medium diameter hole 3c larger than the cylinder hole 3a, and a large-diameter hole 3d larger in diameter than the medium-diameter hole 3c and communicating with the liquid passage hole 7a. And a guide sleeve mounting hole 3e that is larger in diameter than the large diameter hole 3d and that fits the mounting portion 4b of the guide sleeve 4 is formed. In the guide sleeve mounting hole 3e, the fitting grooves 3f and 3f for mounting the ring-shaped retaining clip 14 for preventing the mounting portion 4b of the guide sleeve 4 from coming off are opposed to the central axis CL1 of the plunger 2 on the opening side. Are formed at symmetrical positions on the same circumference.

  A seal support member 15 is disposed on the cylinder hole bottom side of the large diameter hole 3d. The seal support member 15 includes a first cup seal support portion 15a that protrudes into the medium diameter hole 3c, and a liquid passage portion 15c that is disposed in the large diameter hole 3d and includes a liquid hole 15b that communicates with the liquid passage hole 7a. The projection 15d protrudes from the inner peripheral portion of the liquid passage portion 15c toward the guide sleeve mounting hole, and the liquid replenishment portion 15e formed on the inner peripheral surface of the liquid passage portion 15c. The first cup seal 11 is fitted into the medium diameter hole 3c on the cylinder hole bottom side of the first cup seal support portion 15a.

  The guide sleeve 4 extends to the cylinder hole bottom side from the mounting portion 4b, the cylindrical portion 4c provided with the guide hole 4a, the large-diameter mounting portion 4b provided on the outer periphery of the base end portion of the cylindrical portion 4c. And an extending portion 4d. The cylindrical portion 4c has an insertion hole 4e for the plunger actuator 16 at the tip. The mounting portion 4b includes a flange portion 4f protruding from the base end portion of the cylindrical portion 4c to the outer peripheral side, and an outer peripheral cylindrical portion 4g extending from the outer peripheral side of the flange portion 4f to the distal end side of the cylindrical portion 4c. A conical portion 4h that gradually becomes thinner toward the distal end side is formed on the outer peripheral portion of the distal end of the outer cylindrical portion 4g.

  The extending portion 4d is disposed on the cylinder hole opening side of the seal support member 15, and includes a contact portion 4i that contacts the liquid passage portion 15c, and a second cup seal support portion 4j provided on the inner peripheral side of the contact portion 4i. And a seal member support portion 4k provided on the outer peripheral side of the contact portion 4i. The second cup seal 12 is fitted between the second cup seal support portion 4j and the protrusion 15d. Further, a seal member 17 is fitted between the seal member support portion 4k and the liquid passage portion 15c of the seal support member 15.

  The plunger 2 opens at the distal end of the plunger, and has a cylindrical recess 2a that houses the magnet 18, a magnet support 2b that protrudes from the center of the cylindrical recess 2a, and a part of the bottom surface of the cylindrical recess 2a. A spherical recess that has a liquid passage 2c formed in a concave shape on the side and a through hole 2d formed in the peripheral wall of the liquid passage 2c, and a spherical head 16a of the plunger actuator 16 is mounted on the base end. 2e and a retaining member mounting groove 2f that is provided on the opening side of the spherical recess 2e and that mounts a retaining member 19 that prevents the spherical head portion 16a from coming off.

  The magnet 18 operates a magnet switch for detecting clutch operation, is formed in a ring shape, is accommodated in the cylindrical recess 2a with the magnet support 2b protruding from the center, and protrudes from the magnet 18 The magnet 18 is prevented from coming off by caulking while heating the tip of the magnet support 2b.

  The plunger actuator 16 is inserted through the insertion hole 4e, the spherical head portion 16a is inserted into the spherical recess 2e of the plunger 2, and the retaining member 19 is mounted in the retaining member mounting groove 2f and is prevented from coming off. Thereby, the plunger 2 can move in the cylinder hole 3 a integrally with the plunger actuator 16.

  The mounting bolt 10 includes a male screw portion 10a, a head portion 10b having an oval cross section, and a retaining flange 10c. The vehicle body mounting bracket 9 has a head insertion hole 9a having an oval cross section into which the head 10b can be inserted, and a flange housing recess formed around the head insertion hole 9a and capable of housing the retaining flange 10c. 9b. The mounting bolt 10 has the head 10b inserted through the head insertion hole 9a, the retaining flange 10c received in the flange receiving recess 9b, the male threaded portion 10a protruded toward the non-cylinder hole, and the periphery of the flange receiving recess 9b. The mounting bolt 10 is prevented from coming off by crimping while heating the predetermined portion P1 on the cylinder hole side.

  Such a hydraulic master cylinder 1 is assembled by inserting the first cup seal 12, the seal support member 15, and the first cup seal 11 in this order from the bottom of the cylinder hole of the plunger 2 to which the magnet 18 is attached, and the guide sleeve. The seal member 17 is fitted to the seal member support portion 4k, and the guide sleeve 4 is inserted from the cylinder hole opening side of the plunger 2 to form a unit. This unit is inserted into the cylinder body 3, the plunger 2 is inserted into the cylinder hole 3a, the mounting portion 4b of the guide sleeve 4 is inserted into the guide sleeve mounting hole 3e, and the retaining clip 14 is inserted into the fitting grooves 3f, 3f. Is attached to the cylinder body 3. Further, the spherical head 16a of the plunger actuator 16 is inserted from the insertion hole 4e and accommodated in the spherical recess 2e, and the retaining member 19 is mounted in the retaining member mounting groove 2f, whereby the plunger actuator 16 and the plunger 2 are connected. The hydraulic master cylinder 1 is attached to the vehicle body by connecting the attachment bolts 10 and 10 to the attachment portion formed on the vehicle body side.

  When the hydraulic master cylinder 1 formed as described above is not in operation, the plunger 2 together with the plunger actuator 16 is disposed at the position shown in FIG. 1, and the hydraulic chamber 13 has a fluid passage 2c and a through hole 2d. , The fluid replenishing portion 15e, the fluid hole 15b, the fluid passage hole 7a, and the connector 8 communicate with the reservoir. In operation, when the plunger actuator 16 pushes the plunger 2, the plunger 2 moves toward the bottom of the cylinder hole, and the through hole 2d is closed by the first cup seal 11, the communication between the hydraulic chamber 13 and the reservoir is established. By being cut off, a hydraulic pressure is generated in the hydraulic chamber 13. The pressurized hydraulic fluid is supplied to the clutch through the union hole 5a and the hydraulic pipe 6, and at this time, the magnet 18 operates the magnet switch.

  Next, a method for manufacturing the cylinder body 3 of the hydraulic master cylinder 1 will be described with reference to FIGS. The entire cylinder body 3 is integrally formed of resin using a mold. The mold is composed of an outer mold (not shown) that forms the outer surface of the cylinder body 3, and a core that forms the inner surface of the cylinder body 3. The core is composed of a first core 21 and a pair of first Two cores 22 and 22 and a pair of third cores 23 and 23 are provided.

  The first core 21 has recesses 21b and 21b that open to the end and outer periphery of the main body 21a at positions corresponding to the pair of fitting grooves 3f and 3f of the main body 21a that forms the inner surface of the cylinder main body 3. Each is formed. Each second core 22 includes a fitting groove forming portion 22a that forms a fitting groove 3f, and is disposed on the outer periphery of the concave portion 21b, and a knob portion 22b is provided at the end portion. Each third core 23 is disposed on the inner peripheral side of the recess 21b, and a knob 23a is provided at the end.

  When the cylinder body 3 is molded, the first core 21, the second cores 22, 22, and the third cores 23, 23 are arranged in combination in the outer mold, and the molten resin is injected into the mold. . After molding, the third cores 23 and 23 are extracted, and the second cores 22 and 22 are slid to the inner peripheral sides of the recesses 21b and 21b, respectively, and then the second cores 22 and 22 are moved to the first core 21. Pull out with. Thereby, each core 21-23 can be extracted easily, and the cylinder main body 3 provided with the fitting groove 3f can be manufactured easily.

  As described above, according to the hydraulic master cylinder 1 of this embodiment, the large-diameter mounting portion 4b provided at the proximal end portion of the guide sleeve 4 is inserted into the guide sleeve mounting hole 3e provided in the cylinder body 3. By attaching the retaining clip 14 to the fitting grooves 3f, 3f provided in the guide sleeve mounting hole 3e, the guide sleeve 4 can be easily attached to the cylinder body 3, and the parts may be damaged. There is no. Further, since the cylinder body 3 and the guide sleeve 4 are made of resin, there is no risk of corrosion, and the shape of the guide sleeve mounting hole 3e can be easily formed by a molding die and needs to be processed. Therefore, the cost can be reduced. Furthermore, by forming a concave groove 3b in the cylinder axial direction on the peripheral wall of the cylinder hole 3a and forming the union hole 5a toward the concave groove 3b, even if burrs occur when forming the union hole 5a, The inner peripheral surface of the cylinder hole 3a is not affected, the slidability of the plunger 2 can be secured, and it is not necessary to deburr when forming the union hole, so that the operation cost can be reduced. it can.

  In addition, this invention is not restricted to the above-mentioned form example, The shape of a plunger is arbitrary and may not be provided with the magnet. Further, a union hole may be formed in the inner peripheral wall on the bottom side of the cylinder hole without forming a concave groove in the cylinder axial direction. Further, the mounting bolt can be molded on the vehicle body mounting bracket.

  DESCRIPTION OF SYMBOLS 1 ... Hydraulic master cylinder, 2 ... Plunger, 2a ... Cylindrical recessed part, 2b ... Magnet support part, 2c ... Liquid passage, 2d ... Through-hole, 2e ... Spherical recessed part, 2f ... Stopping member mounting groove, 3 ... Cylinder main body, 3a ... Cylinder hole, 3b ... concave groove, 3c ... medium diameter hole, 3d ... large diameter hole, 3e ... guide sleeve mounting hole, 3f ... fitting groove, 4 ... guide sleeve, 4a ... guide hole, 4b ... mounting part, 4c ... cylindrical part, 4d ... extension part, 4e ... insertion hole, 4f ... flange part, 4g ... peripheral cylindrical part, 4h ... conical part, 4i ... contact part, 4j ... second cup seal support part, 4k ... seal Member support part, 5 ... Union boss part, 5a ... Union hole, 6 ... Hydraulic pipe, 7 ... Boss part, 7a ... Liquid through hole, 8 ... Connector, 9 ... Body mounting bracket, 9a ... Head insertion hole, 9b ... Flange receiving recess, 10 ... Mounting bolt, 10a ... Male thread DESCRIPTION OF SYMBOLS 10b ... Head, 10c ... Flange for prevention, 11 ... First cup seal, 12 ... Second cup seal, 13 ... Hydraulic chamber, 14 ... Stop clip, 15 ... Seal support member, 15a ... First cup seal Support part, 15b ... Liquid hole, 15c ... Liquid passage part, 15d ... Projection part, 15e ... Liquid replenishment part, 16 ... Plunger actuator, 16a ... Spherical head, 17 ... Seal member, 18 ... Magnet, 19 ... Stopping member 21 ... 1st core, 21a ... Main body part, 21b ... Recessed part, 22 ... 2nd core, 22a ... Fitting groove formation part, 22b ... Knob part, 23 ... 3rd core, 23a ... Knob part

Claims (1)

In the manufacturing method of a cylinder body of a hydraulic master cylinder, a guide sleeve having a guide hole for guiding the plunger is attached to a cylinder hole opening side of a resin cylinder body having a cylinder hole through which the plunger is inserted. The main body has a guide sleeve mounting hole having a diameter larger than the cylinder hole on which the guide sleeve is mounted on the opening side of the cylinder hole, an opening side of the guide sleeve mounting hole, and opposed to the central axis of the plunger. A pair of fitting grooves for mounting a retaining clip formed on the same circumference, and the cylinder body is injection-molded using an outer mold and a core, and the core is a cylinder A first medium in which recesses are formed at the ends and the outer periphery of the main body at positions corresponding to the pair of fitting grooves of the main body forming the inner surface of the main body. And a pair of second cores disposed on the outer periphery of the recess, and a pair of third cores disposed on the inner periphery side of the recess. After the cylinder body is injection-molded, the third core is extracted, and the second core is slid to the inner peripheral side of the recess, and then the second core is moved together with the first core. A method for manufacturing a cylinder body of a hydraulic master cylinder, wherein the cylinder body is extracted.

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