JP2010001898A - Closing cap fixing device in brake actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology of a closing cap fixing device for stably and surely closing a bolt insertion hole arranged in a housing of a brake actuator. <P>SOLUTION: A closing cap integrally forms a projection part of projecting a cap pin outside on an under surface of a base body part. A worker rotates the cap pin of the closing cap while being brought into pressure contact with a surface of an inclined face part 18b in an under surface 18a of a substantially central part 18A of the housing 18 when rotating the closing cap in the right direction by fitting the cap pin of the closing cap in a cap pin fitting hole 19b. When further rotating in the right direction, the cap pin runs on the apex 18e of the inclined face part 18b. The worker feels a click feeling in hand. When further advancing rotation in the right direction, the cap pin stops by butting against a stopping projection part 18d by advancing while being brought into pressure contact with an surface of a plane part 18c, and the worker confirms a stopping position of the cap pin by the touch of the hand. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a closing cap fixing device for stably and reliably closing a bolt insertion hole provided in a housing after tightening a piston or push rod built in the housing of a brake actuator.

As an example of this type of conventional closing cap fixing device, there is a technique disclosed in Japanese Patent Laid-Open No. 8-177805 shown in FIG. Explaining this, the brake actuator 1 has a housing 3 plastically processed so as to contact the flange case 2. The push rod 4 moves from the flange case 2 outward in the spring chamber 5 into the service chamber 6. When the push rod 4 moves downward from the illustrated position, the push rod 4 activates a brake to stop the vehicle. The diaphragm 7 is fixed between the housing 3 and the flange case 2 and has a center opening 8. A fixing member 9 extends through the center opening 8, and the fixing member 9 is a bolt. The fixing member 9 is fixed to the push rod 4. In this way, the diaphragm 7 and the push rod 4 are directly fixed so as to reciprocate.

The first diaphragm plate 10 is fixed on the spring side of the diaphragm 7 between the diaphragm 7 and a bolt head as the fixing member 9. The second diaphragm plate 11 is fixed between the diaphragm 7 and the push rod 4 on the opposite side of the diaphragm 7. A first sealing bead 7 a is formed on the top side of the diaphragm 7, and a second sealing bead 7 b is formed on the opposite side of the diaphragm 7. The sealing beads 7a and 7b are deformed by the first and second diaphragm plates 10 and 11. A recess 12 a for receiving the first diaphragm plate 10 is formed in the power spring plate 12. A small radial gap exists between the outer peripheral surface of the first diaphragm plate 10 and the inner peripheral surface of the recess 12a.

The power spring plate 12 is held in contact with the power spring guide 13, thereby holding the power spring 14 in a predetermined position. This force resists the relative radial movement between the first diaphragm plate 10 and the power spring plate 12. At the same time, when a radial relative movement or adjustment between the power spring plate 12 and the first diaphragm plate 10 is necessary, a small gap in the radial movement is possible. The plate 15 is bolted to the push rod 4.

Reference numeral 16 denotes a closing cap, which is pushed into and fitted into a perfect circular cap fitting hole 1A drilled in a substantially central portion of the upper surface of the housing 3. For example, as shown in FIGS. 5 (a) and 5 (b), the closing cap 16 is formed integrally with the arm portion 16a, the arm portion 16a, and the upper surface has a planar shape, and the lower surface of the claw-cylinder 16b. And a main body portion 16c provided to hang from the upper surface.

Then, the brake actuator 1 attaches the push rod 4 to the spring chamber 5 formed by the diaphragm 7 and arranges the power spring plate 12 and the power spring 14 in the housing 3 fixed and arranged above the diaphragm 7 before the above described. The winding bolt (not shown) is inserted from the perfect circular cap fitting hole 1A, and the power spring plate 12 is pulled up to complete the adjustment of each member. Then, the closing cap 16 is fitted and fixed to the perfect circular cap fitting hole 1A by a one-touch method.
Japanese Patent Laid-Open No. 8-177805

Since the above-described closing cap fixing device in the brake actuator in the prior art has the above-described configuration and operation, the following problems exist.
That is, the cylinder 16b with the claw of the closing cap 16 is pushed and inserted into the perfect circular cap fitting hole 1A drilled in the substantially central portion of the upper surface of the housing by a one-touch method. Depending on the degree of pushing force when pushing the upper surface of the main body portion 16c of 16 and the size of the outer dimensions of the claw-shaped cylindrical body 16b, the closing cap 16 is not completely fitted into the perfect circular cap fitting hole 1A. This brake actuator may be mounted on the vehicle. In such a case, there is a problem that vibration is applied to the vehicle traveling on the road, so that the closing cap 16 falls out of the perfect circular cap fitting hole 1A. For this reason, the sealing performance of the housing 3, that is, the spring chamber becomes insufficient, and mud or sewage enters the housing 3 to corrode or damage the internal components such as the power spring plate 12 and lose its function. there were.

And, when the operator pushes the closing cap 16 toward the perfect circular cap fitting hole 1A, if the pushing force is not strong, it does not completely fit into the perfect circular cap fitting hole 1A, and There is a problem that it is difficult to obtain a feeling of completion of pushing by the operator's hand when pushing, and the pushing workability of the closing cap 16 is poor.

The closing cap fixing device in the brake actuator according to the present invention has been invented to solve the above-mentioned problems, and is constituted by the following configurations and means.

In other words, according to the first aspect of the present invention, the cap pin insertion hole is formed so that the cap fitting hole is formed through substantially the center portion and the cap pin of the closing cap is inserted in the vertical direction or the horizontal direction of the cap fitting hole. And a closing cap that closes the cap fitting hole of the housing and has an annular groove provided with an O-ring on the lower surface thereof. The cap pin of the closing cap is a surface that rotates while being in pressure contact, and has a slope portion, a flat portion connected to the slope portion, and a stop protrusion formed at the rear end (right end) of the flat portion. And

According to the second aspect of the present invention, the cap pin insertion hole is formed so that the cap fitting hole is formed through the substantially central portion and the cap pin of the closing cap is inserted in the vertical or horizontal direction of the cap fitting hole. The lower surface (back surface) of the substantially central portion is formed of a notched housing and a cap having a gasket that closes the cap fitting hole of the housing and has a plurality of substantially angled protrusions on the front and back surfaces. ) Is a surface on which the cap pin of the closing cap rotates while being pressed, and has a slope part, a flat part connected to the slope part, and a stop protrusion formed at the rear end (right end) of the flat part. It is characterized by that.

Since the fixing device of the closing cap in the brake actuator according to the present invention has the above-described configuration, the following effects can be obtained.

That is, according to the first aspect of the present invention, the cap pin engagement mechanism includes a cap fitting hole penetratingly formed at a substantially central portion, and the cap pin of the closing cap is inserted vertically or horizontally in the cap fitting hole. A housing having a notch formed therein, and a closing cap that closes the cap fitting hole of the housing and is provided with an annular groove around which an O-ring is loaded on the lower surface. Is a surface on which the cap pin of the closing cap rotates while being pressed, and has a slope portion, a flat portion connected to the slope portion, and a stop projection formed at the rear end (right end) of the flat portion. A fixing device for a closing cap in a brake actuator is provided.
With such a configuration, the cap pin that is formed to protrude from the closing cap does not require a large operating force and rotates while being pressed against the lower surface of the housing. Since the stop position can be easily confirmed visually or by hand, the closure cap can be attached to the housing completely, easily and quickly, and the sealing performance is increased in the housing (chamber). There is no intrusion of mud or water, and there is an effect that the internal components are completely free from corrosion and loss of function.

According to the second aspect of the present invention, the cap pin insertion hole is formed so that the cap fitting hole is formed through substantially the center portion and the cap pin of the closing cap is inserted in the vertical or horizontal direction of the cap fitting hole. And a closing cap provided with a gasket that closes the cap fitting hole of the housing and has a plurality of substantially angled protrusions on the front and back surfaces. (Back) is a surface that rotates while the cap pin of the closing cap is pressed against, and includes a slope portion, a flat portion connected to the slope portion, and a stop projection formed at the rear end (right end) of the flat portion. A fixing device for a closing cap in a brake actuator is provided.
With such a configuration, in addition to the effect of the first aspect, since the gasket as the seal member is used, there is an effect that the sealing performance between the base portion of the closing cap and the housing can be secured. In addition, there is an effect that the sealing property between the base portion of the closing cap and the housing is particularly increased by the substantially chevron protruding around the front and back surfaces of the gasket.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a fixing device for a closing cap in a brake actuator according to the present invention will be described in detail with reference to the accompanying drawings.

1A and 1B are plan views of a housing provided in a brake actuator according to the present invention as viewed from above, wherein FIG. 1A is a view showing the shape of a cap fitting hole, and FIG. It is the end view seen from the line direction.

Reference numeral 17 denotes a brake actuator according to the present invention, and an upper portion thereof has a spring chamber, that is, a housing 18. The housing 18 has substantially the same configuration as the housing 3 shown in the prior art, and as shown in FIG. 1B, the head portion is set such that the substantially central portion 18A is low and the peripheral portion 18B is high. Has been.

A cap fitting hole 19 is formed through the central portion of the substantially central portion 18A of the housing 18. The cap fitting hole 19 is formed in a substantially circular shape as a whole, and cap pin engaging holes 19b and 19b are formed in the hole peripheral edge 19a by notching up and down or left and right. The substantially central portion 18A of the housing 18 described above is press-molded from the upper surface thereof by a press machine or the like, and has a substantially dish-shaped cross section. The cap fitting hole 19 and the upper and lower or left and right cap pin engaging holes 19b and 19b are formed by cutting the metal material of the housing 18 at a time with a press machine or the like.

Reference numeral 20 denotes a closing cap according to the present invention, which has a knob portion 20A and a base portion 20B, which are integrally molded with a hard resin material such as POM (polyacetal resin), other resin materials, or a metal material. It is configured. The knob portion 20A is, for example, formed of a substantially rectangular body having a predetermined width length on the left and right or top and bottom, and is configured in a shape that can be easily rotated by an operator's hand. Is not limited to the shape shown in the figure, and may be a protrusion. Moreover, as an example of the closing cap 20, a hexagon bolt head shape may be used, and the head may be operated using a rotating tool. The base portion 20B is formed in a substantially disc shape as a whole, and as shown in FIGS. 2A and 2B, its upper surface (front surface) 20a is integrally formed with the knob portion 20A and is not formed on the lower surface (back surface) 20b. A protruding portion 20d is formed integrally with the cap pins 20c and 20c.

An annular groove 20e is provided around the outer peripheral portion of the lower surface (back surface) 20b of the base portion 20B of the closing cap 20 and has a substantially semicircular shape, a substantially U shape or a V shape. For example, an O-ring 20f having a sealing function is loaded in the groove 20e. The diameter of the O-ring 20f is set larger than the depth of the annular groove 20e. The dimensional difference between the two becomes a tightening allowance when the closing cap 20 is fixed to the substantially central portion 18A.

The cap pins 20c and 20c serve as a guide when the base portion 20B of the closing cap 20 is fixed to the cap fitting hole 19 of the housing 18, and the cap pin insertion hole 19b of the cap fitting hole 19 is provided. , 19b is set to a size and shape that can be inserted. As an example when carrying out and processing the cap pins 20c, 20c, for example, projecting pins are formed so as to project above, below, left, or right of the projecting portion 20d of the base portion 20B, and a projecting pin having a rectangular or circular cross section. The width is set shorter than the width of the cap pin engagement holes 19b, 19b, and the protruding length is set shorter than the depth of the cap pin engagement holes 19b, 19b.

The protrusion 20d has a cylindrical support shaft shape. Then, after the cap pins 20c, 20c are fitted into the cap pin engaging holes 19b, 19b by the operator's operation, the knob 20A of the closing cap 20 is rotated to an angle of 90 ° to 100 °, and the cap pin 20c and 20c rotate while being pressed against the lower surface (back surface) 18a of the substantially central portion 18A of the housing 18.

Here, in order for the base portion 20B of the closing cap 20 to rotate on the lower surface (back surface) 18a of the substantially central portion 18A of the housing 18, the plate thickness S1 of the substantially central portion 18A is set to be equal to that of the base portion 20B of the closing cap 20. It is set slightly smaller than the gap S2 between the lower surface 20b and the inner walls 20g of the cap pins 20c and 20c. If the gap S2 is too larger than the plate thickness S1 of the substantially central portion 18A of the housing 18, the sealing cap 20 lacks the sealing performance, so the dimensions and the like are determined according to the design specifications of the brake actuator.

Further, on the lower surface (back surface) 18a of the substantially central portion 18A of the housing 18 in the cap fitting hole 19 portion, there is an inclined surface portion 18b, a flat surface portion 18c connected thereto, and a rear end (right end) of the flat surface portion 18c. The stop projection 18d formed in the above is formed. If this is developed, the shape shown in FIGS. 3 (a) and 3 (b) is obtained. In the figure, 18e is the apex formed at the rear end (right end) of the sloped portion 18b.

The internal structure of the brake actuator to which the closing cap fixing device according to the present invention is applied is the same as that shown in FIG.

Next, the operation and action based on the embodiment of the fixing device for the closing cap in the brake actuator according to the present invention will be described.
The operator holds the knob 20A of the closing cap 20 by hand and inserts the upper and lower or left and right cap pins 20c, 20c of the closing cap 20 into the cap pin engaging holes 19b, 19b. Knob portion 20A of the case closure cap 20 is the position of the imaginary line _{X 1} shown in FIG. 1 (a). The operator rotates the knob portion 20A of the closure cap 20 from the position of the X ₁ rightward, i.e. in the direction of the arrow E. As a result, the cap pins 20c, 20c of the closing cap 20 rotate while being pressed against the surface of the inclined surface 18b on the lower surface (back surface) 18a of the substantially central portion 18A of the housing 18. Here, the movement of the cap pin 20c shown in FIG. 3A indicates one movement of the two cap pins 20c and 20c. Knob portion 20A of the case closure cap 20 is the position of the imaginary line _{X 2} shown in FIG. 1 (a).

When the operator rotates the knob 20A of the closing cap 20 in the right direction, that is, in the direction of arrow E, the cap pin 20c rides on the apex 18e of the inclined surface 18b. At this time, the knob 20A rotates to, for example, a click feeling rotation angle θ ₁ = 90 ° as shown in FIG. And an operator produces a click feeling in the hand. When the knob portion 20A is further rotated in the right direction, that is, in the direction of arrow E, the cap pin 20c advances while being pressed against the surface of the flat surface portion 18c, hits the stop protrusion 18d, and stops. At this time, as shown in FIG. 1A, the knob 20A rotates, for example, to a rotation angle θ ₂ at stop = 100 °. Then, the operator confirms the stop position of the cap pin 20c with his / her hand.

As described above, when the operator rotates the knob 20A of the closing cap 20 in the right direction, that is, in the direction of arrow E, the inner walls 20g of the cap pins 20c and 20c are pressed against the surface of the lower surface 18a of the substantially central portion 18A of the housing 18. While rotating. At this time, the upper surface 18f of the substantially central portion 18A of the housing 18 presses the O-ring 20f. The tightness of the O-ring 20f, that is, the portion exposed outward from the annular groove 20e is crushed to enhance the adhesion. Therefore, the base portion 20B of the closing cap 20 is closely attached and fixed to the substantially central portion 18A, and the closing cap 20 closes the cap fitting hole 19. At this time, the closing cap 20 has extremely high adhesiveness compared to the closing cap 16 of the prior art, and it can be said that its safety is extremely high.

Next, an embodiment of a closing cap fixing device in a brake actuator according to the present invention will be described with reference to FIGS.
In this embodiment, the closing cap 20 shown in FIGS. 2A and 2B is provided with a gasket 21 instead of the O-ring 20f. As shown in the figure, the gasket 21 has a thin disk shape of about 4 (mm), for example, and the center of the gasket 21 is a through hole 21a into which a protruding portion 20d having a cylindrical support shaft shape of the base portion 20B of the closing cap 20 is inserted. have. The front and back surfaces 21b and 21c of the gasket 21 are provided with three substantially chevron ridges 21d, 21d and 21d each having a cross-sectional shape such as a trapezoid and a triangular mountain. When tightening the closing cap 20, the gasket 21 has a function as a tightening allowance of the three generally angled ridges 21 d, 21 d, 21 d at a substantially central portion 18 </ b> A of the housing 18. Since the protrusion 21d has a function of sealing alone, there is an effect that the sealing performance between the closing cap 20 and the housing 18 is extremely strong. Moreover, the said gasket 21 is not limited to the above-mentioned structure, Other structures may be sufficient if it is a structure which improves a sealing performance.
In the present embodiment, each of the three substantially chevron ridges 21d, 21d, 21d is provided. However, the present invention is not limited to the number of the present embodiment, and a plurality of or singular substantially chevron ridges may be provided. Good.

In this embodiment, it is not necessary to provide an annular groove 20e as shown in FIGS. 2A and 2B on the lower surface (back surface) 20b of the base portion 20B of the closing cap 20, and the lower surface (back surface). 20b is formed into a flat shape. The other operations and actions of the closing cap fixing device in the brake actuator according to this embodiment are substantially the same as the configuration example described in the above description of the embodiment, and the description thereof is omitted.

It is the top view which looked at the housing provided in the brake actuator concerning the present invention from the upper surface, and (a) is a figure showing the shape of a cap fitting hole, and (b) is an AA line direction of (a). It is the end view seen from. It is drawing which shows the structure of the closure cap applied to embodiment of the fixing device of the closure cap in the brake actuator which concerns on this invention, Comprising: (a) is a front view, (b) is arrow B of (a). It is sectional drawing seen from the -B line direction. In the embodiment of the fixing device for the closing cap in the brake actuator according to the present invention, it is a main part development view in which the main part of the cap fitting hole at the substantially central part of the housing is developed, (a) FIG. 1A is a development view of a dashed-dotted line portion shown in FIG. 1A, and FIG. It is drawing of the gasket applied to the Example of the fixing device of the closure cap in the brake actuator which concerns on this invention, Comprising: (a) is a top view, (b) is from the DD line direction of (a). FIG. It is drawing of the fixing device of the closing cap in the brake actuator by a prior art, (a) is a vertical sectional view, (b) is an enlarged plan view of the closing cap.

Explanation of symbols

17 Brake Actuator 18 Housing 18A Nearly Center Part 18B of Housing Nearly Peripheral Part 18a of Housing The Underside (Back) of the Nearly Center Part of Housing
18b Inclined portion 18c on the lower surface (back surface) of the substantially central portion of the housing 18c Plane portion 18d on the lower surface (back surface) of the substantially central portion of the housing Stop projection 18e on the lower surface (back surface) of the substantially central portion of the housing Top face 18f of inclined surface of lower surface (back surface) Upper surface 19 of substantially central portion of housing 19 Cap fitting hole 19a Perimeter 19b of cap fitting hole Cap pin engaging hole 20 Cap 20A Cap knob 20B Cap base portion 20a Upper surface (surface) of base
20b The lower surface (back surface) of the base of the cap
20c Cap pin 20d Protruding portion 20e Ring 20f O-ring 20g Cap pin inner wall 21 Gasket 21a Gasket through hole 21b Gasket surface 21c Gasket back surface 21d Substantially chevron ridge S1 Plate thickness S2 of the substantially central portion of the housing Pin inner wall gap

Claims (2)

A housing in which a cap fitting hole is formed in a substantially central portion and a cap pin engaging hole into which a cap pin of a closing cap is inserted is formed in a vertical direction or a horizontal direction of the cap fitting hole; The cap has a closed cap that closes the cap fitting hole and is provided with an annular groove around which the O ring is loaded on the lower surface. The lower surface (back surface) of the substantially central portion rotates while the cap pin of the closing cap is in pressure contact with the cap. A fixing device for a closure cap in a brake actuator, comprising: a slope portion, a plane portion connected to the slope portion, and a stop projection formed at a rear end (right end) of the plane portion . A housing in which a cap fitting hole is formed in a substantially central portion and a cap pin engaging hole into which a cap pin of a closing cap is inserted is formed in a vertical direction or a horizontal direction of the cap fitting hole; The cap is closed with a cap with a gasket that closes the cap fitting hole and has a plurality of substantially chevron-shaped protrusions on the front and back surfaces. The bottom surface (back surface) of the substantially central portion is pressed against the cap pin of the closing cap. In a brake actuator characterized in that it has a slope part, a flat part connected to the slope part, and a stop projection formed at the rear end (right end) of the flat part. Closing cap fixing device.

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