JP2015123788A - Hose structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hose structure which contributes to a reduction in the number of components while being applicable to a master cylinder and a reservoir commonly among vehicles each of which has a distance between the master cylinder and the reservoir different from each other.SOLUTION: A horse structure H is a single unit which is molded of resin integrally with: a bellows shape hose I; a connection cylinder 2 connected to one end of the hose 1 and also to an outlet pipe 4 of a reservoir R; and a connector 3 connected to the other end of the hose 1 and also to a connection boss 5 of a master cylinder M.

Description

  The present invention relates to an improvement in a hose structure for connecting a reservoir for storing hydraulic fluid and a master cylinder installed separately from the reservoir.

  A hose structure in which a reservoir and a master cylinder are separately provided and hydraulic fluid is supplied from the reservoir to the master cylinder through a hose is conventionally known as disclosed in Patent Document 1.

Japanese Patent No. 4150682

  In the conventional hose structure, when connecting the hose to the master cylinder, a connector is connected to the connection boss of the master cylinder, one end of the hose is press-fitted to the outer periphery of the connector, and the outer periphery is tightened with a band or the like. . Therefore, the hose and the connector are separated from each other, and a fastening member such as a band for fastening the end of the hose is required. Therefore, the number of parts and the number of assembling steps are large. Also, the distance between the master cylinder and the reservoir may differ depending on the vehicle type, and it was necessary to prepare multiple types of hoses with different lengths accordingly.

  The present invention has been made in view of such circumstances, and contributes to the reduction of the number of parts, and is also applied in common to each star cylinder and reservoir even in a vehicle type in which the distance between the master cylinder and the reservoir is different. An object is to provide a hose structure to be obtained.

  To achieve the above object, the present invention provides a bellows-like hose, a connecting cylinder connected to one end of the hose and connected to the outlet pipe of the reservoir, and connected to the connecting boss of the master cylinder connected to the other end of the hose. The first feature is that the connector is integrally molded with a synthetic resin.

  In addition to the first feature, the present invention has a second feature that the connector is formed thicker than the hose.

  Furthermore, in addition to the first or second feature, the present invention has a third feature that the connector is formed to be bent at an intermediate portion thereof.

  Furthermore, the present invention is characterized in that, in addition to the first feature, the connection tube is formed thinner than the connector.

  According to the first feature of the present invention, the hose structure for connecting the reservoir and the master cylinder includes a bellows-like hose, a connection tube connected to one end of the hose and connected to the outlet pipe of the reservoir, a hose and the like. A single part is formed by integrally molding the connector connected to the connection boss of the master cylinder with the synthetic resin. Therefore, the number of parts and the assembly process can be greatly reduced, which can contribute to cost reduction. In addition, the bellows-like hose is highly stretchable and flexible, so even if the distance between the reservoir and the master cylinder and the relative orientation of the two differ depending on the vehicle model, it can be accommodated by the expansion and contraction of the hose. can do. Therefore, the number of hose structures to be prepared corresponding to the vehicle type can be remarkably reduced, which can contribute to a reduction in management costs.

  According to the second feature of the present invention, the hose and the connector have wall thicknesses corresponding to the respective functions. Therefore, the hose has flexibility that is rich in expansion and contraction, and the connector has the flexibility. Connection rigidity with the connection boss of the master cylinder can be imparted.

  According to the third feature of the present invention, when the hose and the connecting boss of the master cylinder form an angle, connecting the bent connector to the connecting boss can suppress the bending of the hose and reduce the stress load on the hose. Can be reduced.

  According to the fourth aspect of the present invention, the connection cylinder can be easily press-fitted and connected to the outlet pipe of the reservoir by forming the connection cylinder thinner than the connector.

The hose structure which concerns on this invention, the reservoir | reserver connected by it, and a longitudinal side view of a part of master cylinder. Explanatory drawing of the forming process of the hose structure.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  In FIG. 1, a reservoir R and a master cylinder M in a vehicle brake device are installed separately from each other and are connected to each other via a hose structure H.

  The hose structure H includes a bellows-like hose 1, a connection cylinder 2 connected to one end of the hose 1 and press-fitted to the outlet pipe 4 of the reservoir R, and a connection boss 5 of the master cylinder M connected to the other end of the hose 1. The hose 1, the connecting tube 2 and the connector 3 are integrally formed with a soft synthetic resin.

  At that time, the connector 3 is formed thicker than the hose 1. Further, the connecting tube 2 is formed to be substantially the same thickness as the hose 1, and thus thinner than the connector 3. This connecting cylinder 2 is press-fitted and connected to an outlet pipe 4 protruding from the lower side surface of the reservoir R, and a band 6 for fastening it is mounted on the outer periphery thereof.

  While the hose 1 is arranged substantially horizontally, the connecting boss 5 of the master cylinder M is erected substantially vertically, so that the connector 3 is formed so that its middle portion is bent at a substantially right angle. A continuous horizontal portion 3a and a vertical portion 3b bent downward from the tip of the horizontal portion 3a are provided.

  A flange 10 and a fitting cylinder portion 11 protruding from the lower end surface of the flange 10 are formed at the lower end portion of the vertical portion 3b. An abutting O-ring 12 is attached.

  On the other hand, the connection boss 5 of the master cylinder M has a first fitting hole 14 opened at the upper end surface thereof and a second fitting hole 15 having a smaller diameter connected to the lower end of the first fitting hole 14. The second fitting hole 15 is provided and continues to a supply port 16 that opens to the liquid chamber 17 of the master cylinder M. The flange 10 is fitted into the first fitting hole 14, the fitting cylinder portion 11 is fitted into the second fitting hole 15, and the O-ring 12 is connected to the first and second fitting holes 14. , 15 is pressed against the annular step. Then, the circlip 18 that holds the flange 10 is locked to the inner periphery of the first fitting hole 14. Thus, the connector 3 is connected to the connection boss 5.

  Thus, the reservoir R stores the hydraulic fluid F, and the hydraulic fluid F is supplied to the supply port 16 through the hose 1 and the connector 3 and further to the liquid chamber 17 to fill the liquid chamber 17. When the piston 19 is pushed forward (leftward in FIG. 1) by depressing a brake pedal (not shown), the hydraulic pressure generated in the liquid chamber 17 is supplied to the wheel cylinder and braking is performed.

  Next, a method for manufacturing the hose structure H will be described with reference to FIG.

  The mold apparatus 20 used in this manufacturing method includes an upper mold 21 and a lower mold 22 that have an inner peripheral surface corresponding to the outer peripheral surface of the hose structure H and that open and close up and down, and an inner periphery of the connecting cylinder 2 and the hose 1. A core 23 having an outer peripheral surface corresponding to the upper surface and supported between the upper and lower molds 21 and 22; and a core pin 24 having an outer peripheral surface corresponding to the inner peripheral surface of the connector 3; The distal end portion of the pin 24 is adapted to fit into a hole 25 opened in the distal end surface of the core 23.

  Thus, when the core 23 and the core pin 24 are set at predetermined positions and the upper and lower molds 21 and 22 are closed, a cavity 26 corresponding to the hose structure H is formed between the upper and lower molds 21 and 22. Is done. A gate 27 and a runner 28 that open to the cavity 26 are provided in the upper mold 21, and a hose structure H is formed by injecting molten synthetic resin J into the cavity 26 from the runner 28 and the gate 27.

  After the molded product is cooled, the upper and lower molds 21 and 22 are opened, and then the core 23 and the core pin 24 are pulled out of the molded product by using the flexibility of the molded product to obtain the hose structure H.

  Next, the operation of this embodiment will be described.

  As described above, the hose structure H connecting the reservoir R and the master cylinder M includes the bellows-like hose 1, the connecting cylinder 2 connected to one end of the hose 1 and connected to the outlet pipe 4 of the reservoir R, and the hose. Since the connector 3 connected to the connection boss 5 of the master cylinder M and connected to the other end of 1 is integrally formed of synthetic resin, it becomes a single part. Therefore, the number of parts can be greatly reduced as compared with the conventional one, and the connecting process of the hose 1 and the connector 3 as in the prior art becomes unnecessary, and the assembling process can be reduced.

  In addition, since the bellows-like hose 1 can freely expand and contract, the hose 1 can be expanded and contracted even if the distance between the reservoir R and the master cylinder M and the relative orientation of both differ depending on the vehicle type. It is possible to cope with them. That is, since one type of hose structure H can be used for a plurality of vehicle types, the types of hose structures H to be prepared corresponding to the vehicle types can be significantly reduced, which can contribute to a reduction in management costs.

  Moreover, since the connector 3 is formed thicker than the hose 1, the hose 1 and the connector 3 have a thickness corresponding to each function. The connector 3 can be provided with abundant flexibility and connection rigidity with the connection boss 5 of the master cylinder M.

  Further, since the connector 3 is formed so as to be bent at an intermediate portion thereof, when the hose 1 and the connection boss 5 of the master cylinder M form an angle, when the bent connector 3 is connected to the connection boss 5, Bending can be suppressed to a small extent, and the stress load on the hose 1 can be reduced.

  Further, since the connecting cylinder 2 is formed thinner than the connector 3, the press fitting connection of the reservoir R to the outlet pipe 4 can be easily performed.

  The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention. For example, the connector 3 can be formed linearly.

H ... Hose structure M ... Master cylinder R ... Reservoir 1 ... Hose 2 ... Connection cylinder 3 ... Connector 4 ... Outlet pipe 5 ...・ Connection boss

Claims (4)

  A bellows-like hose (1), a connecting tube (2) connected to one end of the hose (1) and connected to the outlet pipe (4) of the reservoir (R), and a master connected to the other end of the hose (1) A hose structure formed by integrally molding a connector (3) connected to a connection boss (5) of a cylinder (M) with a synthetic resin. The hose structure according to claim 1,
A hose structure characterized in that the connector (3) is formed thicker than the hose (1). The hose structure according to claim 1 or 2,
A hose structure characterized in that the connector (3) is formed so as to be bent at an intermediate portion thereof. The hose structure according to claim 1,
A hose structure in which the connecting tube (2) is formed thinner than the connector (3).

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