JPH09226549A - Damping orifice machining method for brake actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cost for installing a damping orifice. SOLUTION: An assembling hole 14 is drilled through a housing 1 for building a valve therein and a step part hole 15 is formed on the bottom of the assembling hole 14 so as to have the prescribed depth. Furthermore, a communication hole 11 is provided over an area from the bottom of the step part hole 15 to a damper chamber 10, and a step part 16 is formed between the communication hole 11 and the step part hole 15. Then, the step part 16 of the housing 1 is indented with a guide 22 formed to have a tooth of larger diameter than the communication hole 11 but smaller diameter than the step part hole 15 on the end peripheral surface, and to have an end center part of the same cross sectional area as a damping orifice, using an axially extended punch 20. In this case, the the part of the housing 1 forming the step part 16 is plastically deformed until coming in contact with the guide 22. Thereafter, the punch 20 is pulled out to form the damping orifice 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake actuator for an anti-skid brake device (hereinafter referred to as an ABS device), and more particularly to a processing method for providing a damping orifice.

[0002]

2. Description of the Related Art Conventionally, as a brake actuator for an ABS device, for example, one described in JP-A-7-9970 has been known. This conventional brake actuator, as shown in FIG.
1, a connection port 02 to a wheel cylinder (not shown), a connection port 03 to a master cylinder (not shown), a pressure increasing side solenoid valve 04 and a pressure reducing side solenoid valve 05 for reducing / holding / increasing the wheel cylinder hydraulic pressure are shown. , A reservoir 06 for storing brake fluid, a pump 07 for pumping brake fluid from the reservoir 06, and a pump 0
The damper chamber 08 is provided for alleviating the shock caused by the hydraulic pressure of the brake fluid pumped up by the valve 7, and the damping orifice 010 provided in the communication passage 09 connecting the damper chamber 08 and the pressure increasing solenoid valve 04. The communication passage 09 is connected to a master cylinder (not shown). In providing the damping orifice 010, according to this conventional technique, an orifice mounting hole is bored from the side surface of the housing 01, and the plug 011 having the damping orifice 010 provided at the center thereof is formed in the orifice mounting hole. It is installed by plugging in.

[0003]

As described above, in the prior art, when the damping orifice 010 is provided, the plug 011 which is a separate body from the housing 01 is mounted, so that the number of parts increases correspondingly. There was a problem of increasing costs. The present invention has been made by paying attention to the above-mentioned conventional problems, and an object thereof is to eliminate the plug and reduce the number of parts when providing the damping orifice.

[0004]

In order to achieve the above-mentioned object, the present invention provides a housing with a valve for controlling a brake fluid pressure, the valve being in communication with a brake master cylinder and a pump. In the middle of a communication passage communicating with a pump, a damper chamber for damping a shock due to the hydraulic pressure of the brake fluid pumped by the pump and a damper orifice are provided in a brake actuator. The assembly hole for assembling the valve is drilled in, and then a step hole having a diameter smaller than the assembly hole is drilled at a predetermined depth at the bottom of the assembly hole. From the bottom of the hole toward the damper chamber, a communication hole for a communication passage having a diameter smaller than that of the step hole is bored, and a step due to a diameter difference is formed between the communication hole and the step hole. Then, the damping orifice is formed by performing plastic working so that the portion forming the stepped portion is deformed in the direction in which the diameter of the communication hole is narrowed. When performing the plastic working of the step,
Teeth having a diameter larger than that of the communication hole and smaller than that of the step hole are formed on the outer circumference of the tip, and a guide having a cross-sectional area equal to that of the damping orifice is axially projected at the center of the tip. A punch is used to position the teeth of the punch on the step, and the punch is stamped with the guide inserted in the communication hole. At this time, the portion forming the step of the housing contacts the guide. It is preferable to use a processing method in which the punching is performed so as to cause plastic deformation until they come into contact with each other, and then the punch is pulled out (claim 2).

[0005]

In the present invention, since the step formed on the housing is plastically deformed to form the damping orifice, it is not necessary to use a plug having a damping orifice formed separately from the housing, and the number of parts can be reduced.
In the invention according to claim 2, the step portion is stamped with a punch,
After that, when the punch is pulled out, a damping orifice having a cross-sectional area equal to the cross-sectional area of the guide at the tip of the punch is formed.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a sectional view showing a brake actuator of an embodiment having a damping orifice processed by the processing method of the present invention, in which 1 is a housing. The housing 1 includes a connection port 3 to a wheel cylinder (not shown), a connection port 5 to a master cylinder (not shown), and a normally open pressure increasing solenoid valve 6 for reducing / holding / increasing the wheel cylinder hydraulic pressure. And a normally closed depressurizing side solenoid valve 7, a reservoir 9 for storing brake oil, a pump 8 for pumping brake oil from the reservoir 9, an electric motor 8a for driving the pump 8, and a brake oil pumped by the pump 8. Of the damper chamber 10 for alleviating the shock due to the hydraulic pressure of the above, and a damping orifice 12 formed in a communication hole 11 connecting the damper chamber 10 and the pressure increasing side solenoid valve 6
Are provided. In addition, a hole 13 formed in parallel with the communication hole 11 from the pressure-increasing side solenoid valve 6.
Are connected to the connection port 5. The configuration described above is suitable for a brake actuator for ABS.
Since this is a general structure common to the above-mentioned conventional techniques, detailed description thereof will be omitted.

Next, referring to FIG. 1 (e), the construction around the damping orifice 12 will be described in detail. An assembly hole 14 for mounting the solenoid valve 6 on the pressure increasing side is formed in the housing 1, and the assembly hole 14 is formed. A step hole 15 having a diameter smaller than that of the assembling hole 14 is bored at a corner of the bottom of the hole 14 by a depth L, and the communication hole 1 is coaxially provided in the back of the step hole 15.
1 is bored toward the damper chamber 10, and the damping orifice 12 is provided between the communication hole 11 and the step hole 15.

Next, an embodiment of a method of processing the damping orifice 12 will be described. FIG. 1 (a)
(B) (c) (d) (e) shows the manufacturing procedure,
First, as shown in FIG. 3A, an assembling hole 14 is formed in the housing 1, and further, at a corner of the bottom of the assembling hole 14, the diameter is smaller than that of the assembling hole 14, A step portion hole 15 having a diameter larger than that of the communication hole 11 is formed by a depth L, and the communication hole 11 is formed coaxially at the bottom of the step portion hole 15. FIG. 10A shows the time point when the above processing is completed, and thereby an annular step portion 16 is formed between the communication hole 11 and the step portion hole 15 due to a diameter difference. After that, the punch 20 is used to form the damping orifice 12, and the shape of the punch 20 will be described here. An annular tooth 21 having an inward inclination is formed on the outer periphery of the tip of the punch 20, while the punch 20 is formed. Needle-shaped guide 2 at the center of the tip of 20
2 is formed to project. The cross-sectional area of the guide 22 is formed to match the cross-sectional area of the damping orifice 12. As shown in FIG. 2B, the punch 20 is provided with teeth 21 of the punch 20 on the step portion 16, and
Punch 2 with the guide 22 inserted in the communication hole 11
0 is set at the bottom of the step hole 15. Then, the punch 20 in this state is stamped. As a result of this stamping, the teeth of the punch 20 are located inside 21 of the stepped portion 16 of the housing 1 as shown in FIGS. As shown
It is plastically deformed toward the center of the communication hole 11,
At this time, as shown in FIG. 7D, the stamp is strongly stamped so as to be plastically deformed until the deformed portion surely contacts the guide 22.
After that, when the punch 20 is pulled out, the plastically deformed step portion 1
Only a hole having a cross-sectional area corresponding to the outer diameter of the guide 22 remains at the portion 6 and this hole is the damping orifice 12
Becomes

As described above, in the present embodiment,
In forming the damping orifice 12, the housing 1 is formed by being punched and plastically deformed, and a plug (member having an orifice) separate from the housing 1 is not used. The effect that the number of points can be reduced and the cost can be reduced can be obtained.

Further, in forming the damping orifice 12 by plastic deformation, since the punch 20 having the guide 22 protruding in the center of the tip and having the same sectional area as that of the damping orifice 12 is used, the punch 20 is punched with a predetermined strength or more. If it is carved, the damping orifice 12 can be always formed to have a constant diameter, and the effect that the quality can be ensured by a very simple means can be obtained.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like within the scope not departing from the gist of the present invention. Also included in the present invention.

[0012]

As described above, in the damping orifice for the brake actuator of the present invention,
Assembling holes, step holes, and communication holes are formed in the housing in order,
Since the processing method is to form the damping orifice by plastically deforming the step formed between the communication hole and the step hole, there is no need to use a plug with a different damping orifice from the housing. As a result, the number of parts can be reduced and the cost can be reduced. In addition to this effect, in the invention according to claim 2, when the step portion is plastically deformed, a tooth having a diameter larger than the communication hole and smaller than the step hole is formed on the outer periphery of the tip, and the tip center is formed. A punch with a guide that has a required cross-sectional area equal to the damping orifice is punched in the axial direction, so the punch is used to punch the step, and then the punch is pulled out. For example, since a damping orifice having a cross-sectional area equal to the cross-sectional area of the guide at the tip of the punch is always formed, the quality can be stabilized by a simple means.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a processing method according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a brake actuator having a damping orifice formed by the processing method according to the embodiment.

FIG. 3 is a sectional view showing a conventional technique.

[Explanation of symbols] 1 housing 6 pressure increasing side solenoid valve 7 pressure reducing side solenoid valve 8 pump 10 damper chamber 11 communication hole 12 damping orifice 14 assembly hole 15 step portion hole 16 step portion 20 punch 21 tooth 22 guide

Claims (2)

[Claims] 1. A valve for controlling a brake fluid pressure is provided in a housing, the valve communicates with a brake master cylinder and a pump, and the pump pumps up in the middle of a communication passage communicating the valve with the pump. A method for processing a damping orifice in a brake actuator provided with a damper chamber and a damper orifice for alleviating a shock caused by the hydraulic pressure of a brake fluid, which comprises first forming an assembly hole for assembling the valve in the housing, At the bottom of the assembling hole, a step hole having a diameter smaller than that of the assembling hole is bored to a predetermined depth, and further, from the bottom of the step hole toward the damper chamber, A communication hole having a diameter smaller than that of the hole is bored to form a stepped portion due to a difference in diameter between the communication hole and the stepped portion hole, and then the stepped portion is formed. Damping orifice machining method for a brake actuator, characterized by forming the damping orifice performing plastic working to deform in a direction to narrow the diameter of the communicating hole. 2. When performing the plastic working of the step, a tooth having a diameter larger than that of the communication hole and smaller than that of the step hole is formed on the outer periphery of the tip, and a damping orifice is formed at the center of the tip. A punch having a guide having a cross-sectional area is provided so as to project in the axial direction, the teeth of the punch are positioned at the step portion, and the punch is stamped with the guide inserted in the communication hole. 2. The method according to claim 1, wherein the step forming portion of the housing is stamped so as to be plastically deformed until it abuts on the guide, and then the punch is pulled out.