JPH0580948U - Damper chamber structure with built-in ABS actuator - Google Patents

Abstract

(57) [Summary] [Object] To provide a damper chamber structure incorporating an ABS actuator, which is easy to process and assemble, and which can further enhance the damper effect. [Structure] A damper forming hole formed in one direction of the housing 1 and a plurality of damper chambers 20 defined in the middle thereof,
An intermediate plug member 40, which keeps 30 liquid-tight and is capable of slightly moving in the axial direction, a means 70 for holding the intermediate plug member, and a plug member which liquid-tightly seals the opening of the formation hole from the outside. A damper chamber structure that includes 60 and a retaining member 90 that backs up the retaining chamber.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a damper chamber structure incorporating an ABS actuator, and more specifically, a damper chamber incorporating an ABS (anti-lock brake system) in which a damper chamber is integrally incorporated in a housing together with a pump motor, a pump, a solenoid valve, and a reservoir. Concerning the structure of.

[0002]

[Prior Art]

 As such a conventional ABS actuator and a damper chamber structure incorporated therein, a structure as shown in FIG. 6 is known. 1 shows the structure of a damper chamber incorporated in the housing of such an ABS actuator, where 1 is an actuator housing, and in the case of this example, the damper chamber 2 and the rear chamber related to the wheel cylinder control on the front side are arranged. Damper chambers 3 involved in wheel cylinder control are bored so as to face each other from symmetrical positions on both wall surfaces of the housing 1. 4A and 4B are passages for introducing brake fluid from a pump (not shown) to the damper chamber 2, and brake fluid from the damper chamber 2 to the wheel cylinder side via a master cylinder side (not shown) and a solenoid valve for boosting pressure. It is a passage leading. Similarly, the damper chamber 3 is provided with passages 5A and 5B corresponding to the above 4A and 4B.

Furthermore, 6 and 7 are plug members provided to isolate the damper chambers 2 and 3 from the outside, respectively, and O-rings for keeping them gas-liquid tight together are the plug members 6, 7. It is provided around and has screwing members 8 and 9 screwed from the rear portions thereof to provide a backup to prevent the plug members 6 and 7 from coming off. (Similarly, it is described in, for example, the Aristo new model manual of Toyota Motor Corporation (issued in October 1991).)

[0004]

However, in the damper chamber structure according to the above conventional example, the damper chamber 2 related to the front side of the ABS and the damper chamber 3 related to the rear side are individually perforated from the wall surfaces on both sides of the housing 1. It is necessary to finish it, and the plug members 6 and 7 for gas-liquid tight sealing are attached to them, and the screwing members 8 and 9 are attached from the rear of the plug members for backup. However, since the capacity of the damper chamber is narrow and limited, there is a possibility that a sufficient damper effect cannot be expected.

Further, the sealing ring (O-ring) provided around the plug member only has a function of sealing between the outside world and the damper chambers 2 and 3, and these damper chambers 2 and 3 are not sealed. It does not contribute to the function of absorbing the pump pulsation of No. 3 at all.

An object of the present invention is to provide a damper chamber structure incorporating an ABS actuator, which is easy to process and assemble, and which can further enhance the damper effect, in order to solve the above problems. To provide.

[0007]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention provides a damper chamber structure incorporating a plurality of cylindrical ABS actuators disposed in a housing, which has a continuous bottomed structure formed in one direction in the housing. A damper forming hole, an intermediate plug member that defines the damper forming hole in the middle of a plurality of damper chambers to keep it liquid-tight, and that is capable of finely moving in the axial direction, and the intermediate plug member. A holding member for holding the opening of the formed damper forming hole in a liquid-tight manner from the outside and fixed, and a retaining member for preventing the plug member from coming off. It is characterized by having.

Further, the present invention provides a damper chamber structure incorporating an ABS actuator, which has at least one cylindrical damper chamber in the housing, and at least the opening of the bored damper forming hole is liquid-tightly sealed from the outside. The two O-rings for sealing are provided on the outer peripheral surface fitted to the damper forming hole in the plug member to be stopped and fixed, and the two O-rings are arranged between the two O-rings. At least a ring-shaped O-ring of the ring is provided with a ring groove into which a backup ring that allows fine movement in the axial direction and regulates the range of fine movement can be fitted. Is.

[0009]

[Action]

 According to the present invention, the intermediate plug member is held in the middle of the bottomed damper forming hole formed in the housing from one direction so as to be liquid-tight and capable of fine movement in the axial direction through the spring member. , A structure in which a plurality of damper chambers are configured, a plug member is liquid-tightly fixed to one opening of the damper forming hole, and the plug member is backed up by a retaining member. When a plurality of damper chambers are separately provided coaxially from both sides of the housing, a plug member or a backup member must be provided on each opening side. It is possible to enhance the damper effect.

Further, for the purpose of the liquid-tight sealing, two O-rings are provided on the fitting surface of the plug member, and a backup ring interposed between these O-rings and capable of restricting the moving range of the O-rings. By providing a seal groove for fitting and the fitting of these rings, the pulsation absorbing effect of the damper chamber can be provided in the sealing portion by the fine movement of the O − ring in the axial direction.

[0011]

【Example】

 Hereinafter, embodiments of the present invention will be specifically described.

FIG. 1 shows an example of an ABS device to which the present invention can be applied. 10 enclosed by a broken line is its actuator, 11 is a master cylinder, 12 is a front wheel cylinder, and 13 is a rear wheel cylinder. is there. Further, the actuator 10 is provided with pumps 14A and 14B, reservoirs 15A and 15B, and damper chambers 20 and 30 for pressurizing the hydraulic fluid in the front side piping system and the rear side piping system, respectively. Pressure-increasing solenoid valves 18A and 18B are provided in the left and right wheel cylinder-specific pressure increasing passages 17A and 17B, respectively, which are connected through the front damper chamber 20, and pressure reduction is provided in the left and right wheel cylinder-specific pressure reducing passages 19A and 19B, respectively. Solenoid valves 20A and 20B are provided. Furthermore, similarly, a pressure increasing solenoid valve 18C is provided in the rear side pressure increasing passage 17C, and a pressure reducing solenoid valve 20C is provided in the pressure reducing passage 19C.

The outline of the anti-lock braking operation in the ABS device configured as described above is well known, and therefore a detailed description thereof will be omitted, but in this example as well, the actuator 10 is integrally configured as a unit. To be done. Then, in the damper chamber 20 provided in the housing 1 as described later, when the brake hydraulic fluid pressurized by the pump 14A at the time of increasing the pressure is sent to the wheel cylinder 12 via the pressure increasing passages 17A and 17B, its pulsation is generated. To prevent the kickback action from occurring. It should be noted that the damper chamber 30 also functions similarly to the rear wheel cylinder 13 side.

FIG. 2 shows a first embodiment of the structure according to the present invention of the damper chambers 20 and 30 thus provided in the housing 1. In this example, the damper chambers 20 and 30 are formed by continuously perforating one of the side surfaces of the housing 1 (in this case, the side surface on the right side of the drawing), and here, the damper chambers 20 and 30 are formed. A step is formed between them, and the diameter of the damper chamber 20 formed at the back of the left side is smaller than that of the damper chamber 30 formed at the front right side. Reference numeral 40 is an intermediate plug member which is provided so that the peripheral portion of the end surface 40A abuts on the stepped portion on the damper chamber 30 side, and which partitions the damper chambers 20 and 30. A ring-shaped seal groove 40C is provided around a fitting surface 40B of the intermediate plug member 40 with the fitting portion 30A in the damper chamber 30, and a seal ring (O-ring) 50A is provided in the seal groove 40C. Is fitted in and the space between the damper chambers 20 and 30 is sealed.

Reference numeral 60 is a plug member provided to isolate the damper chamber 30 from the outside of the right side of the housing 1, 60C is a seal groove provided around the fitting surface 60B, and 50B is a seal groove 60C. It is a seal ring fitted in. A spring 70 is provided between the intermediate plug member 40 and the plug member 60, and the spring force of the spring 70 biases the intermediate plug member 40 toward the step portion described above. .. Reference numeral 90 denotes a screw tightening member screwed into the screw hole portion 80B so that the plug member 60 does not come out after the plug member 60 is press-fitted into the fixing hole 80A.

In the damper chamber structure configured as described above, the damper chambers 20 and 30 are perforated as a single hole defined by the intermediate plug member 40, and the intermediate plug member 40 includes the spring 70. The spring force keeps the state of being biased toward the stepped portion that defines the damper chamber, so that the damper chamber 20 can be slightly moved in the axial direction to contribute to the absorption of the pump pulsation. Further, as is clear from the comparison with the conventional example shown in FIG. 6, it is possible to secure a large capacity for each damper chamber.

FIG. 3 shows a second embodiment of the present invention. In this example, a fitting portion 20A of the intermediate plug member 40 is provided on the damper chamber 20 side, and the intermediate plug member 40 is held in the fitting portion 20A in a gas-liquid tight manner, and a spring provided on the damper chamber 20 side. The intermediate plug member 40 is held at the position of the fitting portion 20A by balancing the spring forces of both 100 and the spring 70 provided on the damper chamber 30 side. The other configurations are the same as those in the first embodiment.

In this embodiment, it is possible to obtain the effect that the intermediate plug member 40 functions on both the damper chamber 20 side and the damper chamber 30 side for pulsation absorption.

FIG. 4 shows a third embodiment of the present invention. This embodiment relates to the improvement of the seal structure which is provided around the plug member provided to define the damper chamber, and is applied to the plug member 60 shown in FIG. 2 or 3 below. The plug member 6 and 7 provided at both ends of the structure of the conventional example shown in FIG. 6 or the sealing structure of the intermediate plug member 40 shown in FIG. 2 and FIG. It can also be applied to the edges.

In FIG. 4A, a portion surrounded by a circle and denoted by B is its seal structure, and its details are enlarged and shown in FIG. The damper chamber is originally provided for the purpose of absorbing the pulsation of hydraulic pressure in the chamber, and at the same time, it must be kept liquid-tight from the outside world. In view of this, in this embodiment, the annular seal groove 60C provided around the fitting surface of the plug member 60 has a shape that is sufficiently wide in the axial direction as shown in (B), and the seal groove 60C formed in this way is An O-ring 50C for sealing, a backup ring 50D that restricts the moving range of the O-ring 50C, and another O-ring 50F are fitted in the order shown. In the case of this example, the backup ring 50D is positioned so that the O-ring 50C is allowed to move slightly in the axial direction.

In the damper chamber 30 configured as described above, the behavior of the O-ring 50C whose movement range is restricted by the backup ring 50D, that is, the pulsation generated by the pump is generated in the axial direction of the O-ring 50C. It is possible to prevent the hydraulic fluid from leaking to the outside due to the double sealing effect by the one O-ring 50F as well as the buffering by the slight movement.

In the present embodiment, the combination of the two O-rings 50C and 50F and the one backup ring 50D is used. However, although not shown, another backup ring is provided outside the O-ring 50F. It is also possible to provide the above and allow the O-rings 50C and 50F to move axially in both directions.

FIG. 5 shows a fourth embodiment of the present invention. It should be noted that the present embodiment is an improved example of the one corresponding to the plug member 60 on the dump chamber 30 side shown in FIGS. 2 and 3, but instead of the plug members 6 and 7 in the conventional example shown in FIG. Needless to say, this embodiment can be applied to the case where only one damper chamber is provided in the housing.

In FIG. 5, reference numeral 160 denotes a plug member. In this example, the plug member 160 is intended to be positioned and fixed to the end portion of the damper chamber 30 by press fitting. Here, 160B is a press fitting member on the plug member 160 side. The fitting surface 30B is a press-fitting surface on the damper chamber 30 side. Further, 160C is a seal groove, and 160D is a stopper surface formed by tapering from the rear end of the fitting surface. On the other hand, an annular groove 1D having a substantially arcuate cross section is formed on the housing 1 side corresponding to the stopper surface 160D, and a snap ring 170 is fitted between the annular groove 1D and the stopper surface 160D. The plug member 160 press-fitted by backing is backed up to prevent the plug member 160 from coming out. In this embodiment, the intermediate plug member is not held by the spring as shown in FIGS. 2 and 3, but is pressed and held like the plug member 160, so that the spring in the damper chamber can be omitted. it can. Further, in this example, the O-ring 50C and the backup ring 50D that backs up the O-ring 50C are fitted in the seal groove 160C, but the seal groove 160C and the ring fitted therein are similar to those shown in FIG. It can also be configured to.

In the damper chamber structure configured as described above, it is not necessary to provide a screw tightening member for preventing the plug member from coming off after press-fitting the plug member as in the examples described above. The spring in the damper chamber will also be abolished. Moreover, the capacity of the damper chamber can be increased as much as the spring and the screw member of the damper chamber need not be provided, so that the damper effect can be enhanced and the cost can be reduced. Further, it is possible to withstand the pulsation and the negative pressure and keep the plug member 160 in the fixed position with a simple structure of press-fitting and snap ring structure.

In each of the embodiments described above, the overall structure of the front wheel damper chamber and the rear damper chamber, the structure of the plug member provided at the end of the damper chamber, and the sealing portion of the plug member are described. The structures have been described separately, but it is needless to say that the effects can be further synergistically improved by appropriately combining the structures in these examples.

[0027]

[Effect of the device]

 According to the present invention, a continuous bottomed damper forming hole formed in a housing in one direction and a plurality of damper chambers defining the damper forming hole on the way to maintain liquid tightness, and The intermediate plug member, which is held so that it can be finely moved in any direction, a means for holding the intermediate plug member in a predetermined defining position, and the opening of the bored damper forming hole is liquid-tightly sealed from the outside. Since it is equipped with a plug member that is stopped and fixed, and a member that prevents the plug member from coming off, the capacity of each damper chamber can be kept larger than before, and a damper forming hole can be formed by drilling from one direction. Can be formed, the dumper effect can be improved, and the number of processing steps can be reduced.

Further, in the plug member or the intermediate plug member, as a sealing means provided to maintain liquid tightness with each damper chamber, two sealing members are provided on the outer peripheral surface fitted to the damper forming hole of the plug member. The O-ring is disposed between the two O-rings, and at least the O-ring of the two O-rings on the damper chamber side is allowed to be finely moved in the axial direction. By providing the ring groove that can be fitted with the backup ring that restricts the range of movement, it is possible to enhance the damper effect of suppressing pulsation due to the slight movement of the O-ring in the sealing means.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an ABS actuator to which the present invention can be applied.

FIG. 2 is a sectional view showing a configuration of a first embodiment of the present invention.

FIG. 3 is a sectional view showing a configuration of a second embodiment of the present invention.

FIG. 4 is an explanatory view showing a configuration of a third embodiment of the present invention as sectional views (A) and an enlarged view (B) of a portion B of (A).

FIG. 5 is a sectional view showing the structure of a fourth embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a configuration of a conventional example.

[Explanation of symbols]

1 Housing 1D Annular groove 10 Actuator 20,30 Damper chamber 40 Intermediate plug member 40A End surface 40B Fitting surface 40C, 60C Seal groove 50A, 50B, 50C, 50F Seal ring (O-
Ring) 50D Backup ring 60,160 Plug member 70,100 Spring

Claims (3)

[Scope of utility model registration request] 1. A damper chamber structure incorporating a plurality of cylindrical ABS actuators arranged in a housing, wherein a damper forming hole having a continuous bottom is formed in the housing in one direction, and the damper forming hole. An intermediate plug member which is defined in a plurality of damper chambers on the way to maintain liquid-tightness and is capable of fine movement in the axial direction, and a holding member for holding the intermediate plug member in a predetermined defining position. Means, a plug member for sealing and fixing the opening of the bored damper forming hole from the outside in a liquid-tight manner, and a stopper member for preventing the plug member from coming off. Damper chamber structure. 2. The intermediate plug member and / or the plug member are arranged between two sealing O-rings on an outer peripheral surface fitted in the damper forming hole, and between the two O-rings. Of the two O-rings, at least the damper chamber-side O-ring has a ring groove that can be fitted with a backup ring that allows a minute movement in the axial direction and limits the range of the minute movement. The damper chamber structure incorporating the ABS actuator according to claim 1. 3. A cylindrical bottomed damper forming hole formed in the housing from one direction, and a plug member fixed by sealing the opening of the damper forming hole from the outside in a liquid-tight manner. In the damper chamber structure incorporating the ABS actuator, the plug member is disposed between the two O-rings for sealing on the outer peripheral surface fitted into the damper forming hole, and the two O-rings. Of the two O-rings, at least the O-ring on the damper chamber side is provided with a ring groove that can be fitted with a backup ring that allows fine movement in the axial direction and regulates the range of the fine movement. The feature is a damper chamber structure with built-in ABS actuator.