JPH0433175Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to a foot-operated parking brake operating device, and more specifically, to a cylinder-type damper in the device. It is.

(Prior Art) A conventional device of this type is disclosed in Japanese Utility Model Application Publication No. 61-9365, and includes a cylinder type damper shown in FIG.

This cylinder type damper 1 includes a cylinder body 2,
A rod 3 connected to the harking brake pedal, a piston 4 provided at the tip of the rod 3,
A bracket 6 is fastened to one end of the cylinder body 2 via a seal member 5 to seal the inside of the cylinder body 2, and a bracket 6 is pivotally attached to a non-operating part, and the inner periphery is secured to the other end of the cylinder body 2 via a seal member. The main component is a retainer 7 which is fitted into the cylinder body 2 at its outer periphery via a sealing member and seals the inside of the cylinder body 2.

(Problems to be solved by the invention) In general, this type of cylinder type damper, in the case of air type dampers, prevents the generation of operating noise (suction and discharge sounds) and prevents rust on the inner surface of the cylinder body due to moisture intrusion. The cylinder body is hermetically sealed to prevent malfunction due to the intrusion of foreign matter, and in the case of oil-type cylinders, to prevent indoor contamination and malfunction.

However, in this damper, the bracket is fixed to the cylinder body by tightening the outer surface of the cylinder body from the outer periphery into an annular groove provided on the fitting surface of the bracket. The pressure force between the pistons is not uniform, and as a result, it is impossible to seal the internal space of the cylinder body in which the piston slides, and sealing requires a sealing member, which causes the problem of an increase in the number of components. It was hot.

Therefore, the technical object of the present invention is to fix the bracket to the cylinder body and seal the internal space of the cylinder body without requiring a sealing member.

[Structure of the idea]

(Means for solving the problem) The technical means taken to solve the above technical problem is to provide two lands on the fitting surface with the cylinder body on the side surface of one end of the bracket, and to provide a space between the two lands. The other end of the bracket is provided with a concave portion having an inclined surface with a small diameter.

(Function) By making the fitting surface of the bracket with the cylinder body into the above-mentioned shape, the land portion is fitted into the inner surface of the body, and a cylindrical shape having an inclined surface similar to the inclined surface between the two land portions on the inner surface is formed. By press-fitting the jig into the cylinder end in the axial direction, the inner surface of the cylinder body can be brought into close contact with the inclined surface between the lands of the bracket with uniform surface pressure, thereby creating a seal inside the cylinder body. It can be sealed without requiring any parts.

(Embodiment) Hereinafter, an embodiment of the present invention will be described based on the drawings. FIGS. 1 and 2 show a foot-operated operating device according to an embodiment of the present invention. The operating device includes a parking brake pedal 10, a lock mechanism 20, a release mechanism 30, and a cylinder damper 40, which is the main part of the present invention. In this embodiment, an air type damper 40 is used as the cylinder type damper 40.

The parking brake pedal 10 is for operating the parking brake, and includes a sector gear 12 at the upper end of an arm section 11, a pedal section 13 at the lower end, and a base 5 fixed to the vehicle body.
1 and a plate 52 fixed thereto via a stepped bolt 14 so as to be rotatable. The parking brake pedal 10 is connected to a parking brake (not shown) via a parking brake cable 60, and is biased counterclockwise in FIG. The parking brake cable 60 is positioned and the parking brake cable 60 is pulled by pressing the brake pedal to activate the parking brake. Note that a brake switch 58 is provided on the side of the stopper rubber 59.

The lock mechanism 20 is composed of a ball 21 and a tension spring 22, and the ball 21 is provided with a claw portion 21a at one end thereof which removably engages with the sector gear 12. This ball 21 is rotatably assembled by a support pin 23 between a base 51 and a plate 52, and is biased clockwise by a tension spring 22 to the upper end of the parking brake pedal 10. It makes elastic contact. In this locking mechanism 20, when the parking brake pedal 10 has returned to its initial position (the state shown in the first figure), the ball 21
is not engaged with the sector gear 12, and when the sector gear 12 rotates by pressing the parking brake pedal 10, the ball 21 engages a part of the sector gear 12 and locks the parking brake pedal 10 in the pressed position. do.

The release mechanism 30 is for unlocking the parking brake pedal 10 and is composed of a release lever 31, a release cable 32, a compression spring 33, a release knob 34, and a release stopper 35.
The release lever 31 includes an arm 31a that can be engaged with and detached from the ball 21, and is rotatably assembled between a base 51 and a plate 52 by a support pin 36, and a compression spring 3
3 in the clockwise direction shown in FIG.
In such a release mechanism 30, when the release knob 34 is not operated, the arm 3 of the release lever 31
1a is spaced apart from the ball 21, and when the release knob 34 is pulled, the release lever 31 rotates counterclockwise, engages the arm 31a with the ball 21, rotates the ball 21 counterclockwise, and operates the sector gear. He will be removed from 12.

As shown in FIGS. 1 to 4, the cylinder-type damper 40 operates to apply resistance to the parking brake pedal 10 when the parking brake pedal 10 rotates back from the depressed position toward the initial position shown. It is interposed between the support member 53 fixed to the base 51 and the parking brake pedal 10. This cylinder type damper 40 is
As shown in FIG. 3, the main components are a cylinder body 41, a rod 42 integrally equipped with a piston 43, a bracket, and a retainer 44, and as shown in FIGS. It is pivotally connected to a stepped bolt 54 fixed to a mounting member 53 by a bracket fastened to the end of the main body 41 using a nut 55, and the tip 42a of the rod 42 is connected to the arm portion 11 of the parking brake pedal 10. Stepped bolt 5 fixed in the middle part
6 using a nut 57. As shown in FIG. 3, the piston 43 is slidably inserted into the cylinder body 41 via a seal cup 45 that opens to the right in the figure, and is held by the cylinder body 41 and the retainer 33. The sealed chamber to be formed is divided into a first air chamber R1 and a second air chamber R2. As shown in FIGS. 3 and 4, this piston 43 is provided with an L-shaped communication hole H that communicates both air chambers R1 and R2, and the first air in the communication hole H is Large diameter inner hole Ha at the end of the chamber R1 side
A diaphragm member 46 is fitted and fixed inside. The throttle member 46 is made of a sintered material, which is a type of porous material having a large number of pores (not shown) that allow ventilation, and the throttle member 46 is designed to provide ventilation resistance. It's summery.

The retainer 344 has O-rings 47A on the inner and outer peripheries,
47B, and is fitted into the open end of the cylinder body 41, and fixed with a pair of clips 48A and 48B to restrict axial movement, thereby airtightly sealing the space between the cylinder body 41 and the rod 42. There is.

In addition, as shown in an enlarged view in FIG. 4, the bracket is provided with two land portions 49A and 49B on the side surface, and between both lands 49A and 49B, an inclined surface is provided with an inner diameter on the land 49A side on the left side in the figure. is,
A recess 50 is formed, and both land portions 49
A and 49B are fitted into the open end of the cylinder body 41, and the cylinder body 41 is fastened and fixed, thereby sealing the first air chamber R1.

In the operating device configured in this way,
When the parking brake pedal 10 is depressed, the parking brake cable 60 is pulled and the parking brake is activated, and the locking mechanism 20 closes the parking brake pedal 1.
0 is locked at the depressed position. At this time, the rod 42 and piston 43 of the cylinder type damper 40 move forward within the cylinder body 41 as the parking brake pedal 10 rotates. Therefore, when the rod 42 and the piston 43 move forward, the squeeze member 46 provided in the communication hole H
Not only that, but also through the outer circumference of the seal cup 45, the first
Since the air in the air chamber R1 flows into the second air chamber R2, there is not much resistance acting on the parking brake pedal 10, and the parking brake pedal 1
There is no problem at all with pressing the 0 button.

Furthermore, when the release knob 34 of the release mechanism 30 is pulled and operated in this state, the release lever 31 rotates to release the locking of the parking brake pedal 10 by the lock mechanism 20, and the parking brake pedal 10 rotates back to release the lock from the stopper rubber. 59 and is positioned at the initial position. At this time, the parking brake pedal 1
0 return rotation, the rod 42 and piston 43 of the cylinder damper 40 move backward within the cylinder body 41. When the rods 42 and 43 are retracted, the seal cup 45 prevents the air in the second air chamber R2 from flowing into the first air chamber R1, so that the air in the second air chamber R2 is the same as that in the communication hole H. The air passes only through the throttle member 46 provided in the communication hole H and flows into the first air chamber R1. Therefore, a predetermined resistance set by the throttle member 46 is applied to the parking brake pedal 10, and the pedal 10 rotates back at a slower rotation speed. This reduces the impact of the parking brake pedal 10 on the stopper rubber 59, suppresses the generation of impact noise, and prevents damage to the stopper rubber 59 and the like.

By the way, in the present invention, as shown in FIGS. 5 and 6, the land portions 49 and 49B provided on the side surface of one end of the bracket 49 are fitted into the inner surface of the end of the cylinder body 41. Land portion 49A, 4
By press-fitting the jig 100 having an inclined surface similar to the inclined surface between 9B and 9B into the cylinder body 41 in the axial direction (direction A in the figure), the cylinder body 41 is tightened and the inner surface of the cylinder body 41 is made into a uniform surface. Because the pressure distribution allows the first chamber R1 to be sealed between the lands 49A and 49B of the bracket 49,
There is no need to interpose a sealing member between the bracket 49 and the cylinder body 41. At this time, the diameter of the land portion 49A is compressed and reduced. As a result, according to the present invention, the number of component parts can be reduced and the sealing member, which is a consumable part, can be omitted, thereby preventing air leakage caused by the reduction in the sealing force of the sealing member due to long-term use. Malfunction of the cylinder-type damper due to malfunction (during operation, air is sucked into the first chamber R1 from the atmosphere, and the pressure difference between the first chamber R1 and the second chamber R2 becomes small during operation, causing the parking brake pedal 10 There is no problem such as excessively slow rotation speed), operation noise (suction/discharge noise), or rust on the inner surface of the cylinder body.

In this embodiment, the case where the present invention is applied to an air-type cylinder type damper has been explained, but the present invention can also be applied to an oil-type cylinder type damper and achieve the same effect as the air type. Of course you can play it.

[Effect of idea]

In order to solve the technical problems of the present invention, it is possible to fix the bracket to the cylinder body by welding, but the cylinder body will be distorted due to the effects of heat from welding, which will impair the sliding properties of the piston. The problem is that the cylinder type damper cannot operate smoothly. However, according to the present invention, there are two
In addition to providing two land portions, a recessed portion having an inclined surface with a small diameter on the other end of the bracket is provided between both land portions, and both land portions are fitted into the cylinder body and a load is applied in the same axial direction to tighten the cylinder body. By doing so, the surface pressure on the crimped surfaces between both members can be made uniform without causing the above problems, and the inside of the cylinder can be sealed without using a sealing member between the two members, and the number of component parts can be reduced. In addition, since the structure does not require a sealing member, which is a consumable part, it is possible to obtain a highly durable and reliable cylinder-type damper, which improves the reliability of the operation of the parking brake foot-operated device. can be improved.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment of a foot-operated parking brake operating device according to the present invention, Fig. 2 is a rear view of Fig. 1, and Fig. 3 is a device adopted in the device shown in Fig. 1. FIG. 4 is an enlarged sectional view of the main part of the present invention in FIG. FIG. 7 is a longitudinal sectional view of a conventional cylinder type damper. 10... Parking brake pedal, 20...
Lock mechanism, 30... Release mechanism, 40... Cylinder type damper, 41... Cylinder body, 49...
...Bracket, 49A, 49B...Land part, 5
0... Concavity.

Claims (1)

[Scope of utility model registration request] A parking brake pedal that is rotatably attached to a support member provided on the vehicle body and is connected to the parking brake to activate the parking brake when depressed; and a lock that releasably locks the parking brake pedal in the depressed position. a mechanism, a release mechanism that unlocks the lock mechanism and allows the parking brake pedal to elastically return from the depressed position and rotate to deactivate the parking brake; and a release mechanism that is fitted into and tightened to the cylinder body. a cylinder-type damper, the cylinder-type damper having one end pivotally connected to the support member by a bracket provided with the brake pedal, the cylinder-type damper being interposed between the support member and the parking brake pedal, and operating during return rotation of the pedal; In the type operating device, two land portions are provided on the fitting surface of one end of the bracket of the cylinder type damper with the cylinder body, and the other end of the bracket is provided with an inclined surface having a small diameter between the two land portions. 1. A foot-operated parking brake operating device, characterized in that the bracket has a recessed portion having a land portion and is fastened to the cylinder body by fitting the land portion into the cylinder body.