JPH0613975U - Parking brake device - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a parking brake device that is easy to operate and has excellent operability without releasing braking due to malfunction or vibration. [Structure] Operation lever 40 supported by sector 30
And a rotatable locking pawl 10 having a first position in which it engages with the tooth portion 34 and a second position in which the engagement is released according to the moving direction of the release rod 70. . Further, the position facing the claw portion 10A and the operation lever 40
The second spring 14 positioned on the extension line of the first spring 12 whose end is hooked and extended by the displacement of the release rod, and the engagement and disengagement positions according to the displacement of the operation knob 44. And a stroke regulating means 18 for setting
The relationship in which the first spring 12 has a larger urging force than the second spring 14 in the initial state corresponding to the case where the operation knob 44 is not pushed in while being engaged by the pulling force from the brake cable 60. Set to.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parking brake device, and more particularly, to a structure for preventing an erroneous operation in which breaking is inadvertently released.

[0002]

[Prior art]

 Generally, a parking brake device equipped in a passenger car or the like has a structure shown in FIG. 5, for example.

That is, the parking brake device 1 shown in FIG. 5 has a structure called a floor type provided on the floor of the driver's seat, and includes a sector 30, an operating lever 40, and a so-called A locking pawl 50 forming a brake pole is provided as a main component.

The sector 30 described above is fixed to, for example, an immovable portion such as a floor of a driver's seat, and an arc portion centered on a pin 32 that forms a fulcrum of an operation lever 40 described later is formed. A plurality of tooth portions 34 are provided in the portion along the circumferential direction.

The operating lever 40 is a lever-shaped member that can swing about a pin 32 as a fulcrum, and one swing end with respect to the pin 32 has an end portion of a brake cable 60 connected to a brake device of a vehicle. However, a grip 42 is attached to the distal end portion at the other swinging end with respect to the pin 32, so that the brake cable 60 can be pulled by pulling up the grip 42 side in the figure.

An operating knob 44 is slidably mounted inside the grip 42 mounted on the operating lever 40. The operating knob 44 is normally biased by a spring 46, The posture in which the head is projected from the tip of the grip 42 is set.

Further, one end of the release rod 70 in the extension direction is fixed to the operation knob 44, and the other end of the release rod 70 in the extension direction is connected to a locking claw 50 described later.

On the other hand, the locking claw 50 is rotatably supported by the operating lever 40 in a state of facing the tooth portion 34 of the sector 30, and is opposed to the release rod 70 by sandwiching the rotation support shaft 54. A claw portion 52 facing the tooth portion 34 of the sector 30 is formed at the side end portion.

The locking claw 50 is designed to be rotatable in association with the displacement of the release rod 70, and normally, in accordance with the displacement of the release rod 70 in the direction in which the spring 46 is biased. When the first position (the position shown by the solid line in the figure) that engages with the tooth portion 34 of the sector 30 is set, and the release rod 70 is displaced in the direction against the bias of the spring 46, Is set to a second position (position shown by a chain double-dashed line in the drawing) that is disengaged from the tooth portion 34 of the sector 30.

In such a parking brake device 1, in the so-called braking state, the release rod 70 is biased by the spring 46 to set the first position of the locking pawl 50. The pulling force of the brake cable 60 pushes the claw portion 52 of the locking claw 50 against the tooth portion 34 of the sector 30 to maintain the braking state.

On the other hand, when the engagement between the locking claw 50 and the sector 30 is released to release the braking, the operation knob 44 is pushed into the grip 42 against the bias of the spring 46. As a result, as shown by the chain double-dashed line in the figure, the locking claw 50 is rotated through the displacement of the release rod 70 that is interlocked with this pushing, and the claw portion 52 is disengaged from the tooth portion 34 of the sector 30.

[0012]

[Problems to be solved by the device]

 By the way, in the above-mentioned parking brake device, as a connecting structure of the locking claw 50 and the release rod 70, as shown in FIG. 6, the end portion of the release rod 70 is fitted into the mounting hole 54 formed in the locking claw 50. It is said that the structure has been inserted.

Accordingly, since the displacement of the release rod 70 has a structure for promptly rotating the locking claw 50, the operation knob 44 is operated by, for example, mischief of a child on board or some kind of impact. If is displaced in the direction against the bias of the spring, the engagement between the locking claw 50 and the tooth portion of the sector 30 may be inadvertently released.

Therefore, in order to solve such a problem, for example, in releasing the braking, there are two stages: an operation of pushing the operation knob against the bias of the spring and an operation of lifting the operation lever. It has also been proposed to employ a structure in which the braking can be released only by performing the above operation (for example, Japanese Utility Model Publication No. 56-14133).

However, in such a configuration, not only the releasing operation of the parking brake becomes complicated, but also the structure of the device itself may be complicated.

Therefore, in view of the above-mentioned problems in the conventional parking brake device, an object of the present invention is to prevent the braking from being released by a malfunction or vibration, and to have excellent operability and a simple structure. To obtain a proper parking brake device.

[0017]

[Means for Solving the Problems]

 In order to achieve this object, a device according to claim 1 has a sector fixedly arranged on a stationary part of a vehicle body and having a plurality of teeth, an operating lever swingably supported by this sector, and this operation. A first position in which the tooth portion of the sector is engaged and a second position in which the engagement is released according to the moving direction of the release rod that is interlocked with the displacement of the operation knob provided in the lever. In a parking brake device having a rotatable locking claw selected from the above, the extension direction ends are respectively applied to the position facing the claw part across the rotation fulcrum of the locking claw and the operation lever. A first spring that is stopped and urges the locking pawl in a direction to engage the sector, and is positioned on an extension line of the first spring, and extends in the extension direction of the release rod and the locking pawl. Hang the end A second spring which is extended by the displacement of the release rod, and an engaging state and an engaging state of the locking claw, which are fixed to the operation lever and correspond to the displacement of the operation knob. The first and second springs are engaged with the locking claw and the sector by the pulling force from the break cable. It is characterized in that the relationship of the urging force in the initial state when the operation knob is not pushed in is set such that the first spring is larger than the second spring.

According to a second aspect of the invention, the locking force by which the locking claw is pressed against the sector by the pulling force from the brake cable and the biasing force of the first spring cause the second spring to move from the initial state to the second spring due to the displacement of the release rod. It is characterized in that it is made larger than the urging force that increases due to expansion.

According to the third aspect of the invention, the second spring extends from the initial state due to the displacement of the release rod when the pulling force from the brake cable is removed and the pressing force of the locking claw against the sector is canceled. It is characterized in that the locking claw is rotated in such a direction as to be disengaged from the sector when the urging force increased by doing so exceeds the urging force of the first spring.

[0020]

[Action]

 According to the present invention, the urging force of the first spring is greater than that of the second spring when the operation knob is not pushed in while the locking claw is being pressed against the sector by the pulling force from the brake cable. The locking claw receives a biasing force in the direction of engaging the sector.

When the operation knob is pushed in this state, the acting force generated in the engaging portion between the locking claw and the sector due to the pulling force from the brake cable and the biasing force of the first spring cause the second spring to move. Therefore, even if the second spring extends in response to the displacement of the release rod, the engagement claw is kept in engagement with the sector.

Further, according to the present invention, when the operation lever is pulled up and the pulling force from the brake cable stops acting as the engaging action force between the sector and the locking pawl, the second rod is extended when the release rod is extended according to the displacement. Since the biasing force of the spring exceeds the biasing force of the first spring, the locking claw is disengaged from the sector and disengaged.

[0023]

【Example】

 Hereinafter, the details of the embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a schematic view schematically showing an operating lever in a parking brake device according to an embodiment of the present invention. For convenience, other than the locking pawl and the release rod, they are used in FIG. It is indicated by a symbol.

In FIG. 1, in the same manner as the conventional one, the locking claw 10 is provided with the rotation support shaft 54 in addition to the claw portion 10A formed at one end across the rotation support shaft 54. The first and second springs 12 and 14 are attached to the ends of the side facing the claw portion 10A.

That is, the first spring 12 has one end in the extension direction hooked on the edge of the operating lever 40 and the other end in the extension direction hooked on the locking claw 10.

On the other hand, the second spring 14 is located on the extension line of the first spring 12, one end in the extension direction is the end edge of the locking claw 10, and the other end in the extension direction is the end of the release rod 16. It is hung on the part.

Since the release rod 16 described above faces the second spring 14 at a position different from the extended position from the grip 42, the part extended from the operation knob 44 is bent in the middle, and A latching portion 16A for latching the other end of the spring 14 in the extension direction is formed.

Further, the operation lever 40 is provided with a stroke restricting means 18 composed of a pair of pins at a position facing the bent portion of the release rod 16 with a gap therebetween.

The stroke restricting means 18 is for restricting the moving position of the release rod 16 that moves to set the first and second positions of the locking claw 10 described above. The pin on the side of the locking claw 10 positions the locking claw 10 in the first position, and the side facing the pin positions the locking claw 10 in the second position. ing.

On the other hand, the above-mentioned first and second springs 12 and 14 are set as follows in relation to the urging force corresponding to the load of the springs.

That is, in a state in which the locking claw 10 is pressed against the sector 30 by the pulling force (F1) from the brake cable 60, and in the initial state corresponding to the case where the operation knob 44 is not pressed, When the urging force of the first spring 12 is P1 and the urging force of the second spring 14 is P2, P1> P2 (1).

Therefore, the first spring 12 has a function as a return spring for constantly biasing the locking claw 10 toward the sector 30.

Further, in this state, there is a traction force (F1) from the brake cable 60 as an urging force for rotating the locking claw 10 in a direction to engage with the sector 30. Therefore, the relation of the urging force in the actual initial state is: P1 + P3> P2 ... when the force acting in the direction of engaging the locking pawl 10 by the traction force (F1) from the brake cable 60 is P3. .. (2) is obtained, and in this relationship, the rotation state in which the locking claw 10 is engaged with the sector 30 is maintained.

On the other hand, when the traction force (F1) from the brake cable 60 is generated as the engaging action force (P3) between the locking claw 10 and the sector 30, the operation knob 44 is operated in the so-called braking state. When it is pushed in with force (F), the second spring extends in conjunction with the displacement of the release rod 16 to one of the stroke restricting means 18, and the urging force increases from the initial state.

Therefore, in this embodiment, when the release lever 16 is displaced until it abuts against the other side of the stroke restricting means 18, that is, the positioning side for setting the second position of the locking claw 10. When the urging force generated in the second spring 14 is P2a, the relationship between the urging force P1 of the first spring 12 and the acting force P3 from the brake cable 60 to the locking pawl 10 described above is P1 + P3> P2a. (3) However, the relationship of P1 <P2a is set so that the engagement between the locking claw 10 and the sector 30 is maintained even if the release rod 16 is displaced.

The relationship between the urging forces of the first and second springs 12 and 14 is that the traction force (F1) from the break cable 60 causes the engaging action force (F1) between the locking claw 10 and the sector 30 ( It is set even if it stops working as P3).

That is, in this case, in FIG. 2, the biasing force of the first spring 12 when the operating lever 40 is pulled up by the force (F2) against the pulling force (F1) from the brake cable 60 is P1. Then, at this time, the operation knob 44 is pushed in with the operation force F, so that the release rod 16 abuts against the other of the stroke restricting means 18 from the position in the initial state (indicated by reference numeral in the drawing). When the urging force when the second spring 14 is extended after being displaced by the distance (L) is P2b, P1 <P2b (4) However, the relation of P2 <P2b is set. The locking claw 10 can be rotated in the direction in which it disengages from the sector 30.

The relationship described above is shown in FIG. 3. In FIG. 3, the vertical axis represents the urging force corresponding to the load, and the horizontal axis represents the bending amount.

As is apparent from FIG. 3, when the operation knob 44 is pushed into the first spring 12, the second spring 1 is interlocked with the displacement of the release rod 16. 4 grows.

Then, the urging force of the second spring 14 increases (P2 → P2a) and becomes larger than that of the first spring 12, but at this time, the traction force (F1) from the brake cable 60 exists. In this case, the acting force (P3) due to this traction force (F1) is added to the urging force (P1) of the first spring 12 and the second spring 14 causes the locking claw 10 to move. The urging force required to disengage from the sector 30 is not reached, so that the engaging claw 10 is maintained in engagement with the sector 30 only by displacing the release rod 16.

When the operation knob 44 is pushed in while the engaging force (P3) due to the traction force (F1) from the brake cable 60 described above is canceled, the second spring 14 expands and increases. Since the force (P2b) is larger than that of the first spring 12, the locking claw 10 is rotated in the direction corresponding to the displacement of the release rod 16, that is, in the direction of separating from the sector 30. .

Since the present embodiment has the above-described structure, when the operation knob 44 is pushed in in the so-called braking state, the locking claw 10 serves as a sector due to the relationship of the above formula (2). The release rod 16 which maintains the engagement of the second spring 14 and is displaced in conjunction with the operation knob 44 stops moving in the direction in which the second spring 14 is extended. Therefore, when the operating knob 44 is erroneously operated without intentionally releasing the braking, the locking claw 10 is still engaged with the sector 30, so that the braking is not released.

On the other hand, when releasing the braking, the operation lever 40 is pulled up to cancel the action of the traction force (F1) from the brake cable 60 on the locking pawl 10, and the operation knob is accompanied by this operation. Push in 44.

Therefore, when the action of the traction force (F1) from the brake cable 60 disappears, the second spring 14 extends in conjunction with the displacement of the release rod 70, and according to the relationship of the above formula (4), When the urging force of the second spring 14 exceeds the first urging force, that is, when the second spring 14 extends to the position indicated by the symbol L in FIG. It is rotated in the direction away from 30, and the braking is released.

In the present embodiment, by setting the relationship of the urging forces of the first and second springs 12 and 14 described above, when the locking claw 10 is engaged with the tooth portion 34 of the sector 30, The hitting sound can be reduced.

That is, in FIG. 4, when the pushing of the operation knob 44 is released, the urging force (P2b → P2) as the restoring force until the extended second spring returns to the initial position. And the urging force (P1) of the first spring 12 act on the locking claw 10 to promote rapid rotation.

On the other hand, when the release rod 70 is stopped by the stroke restricting means 18 to reach the initial position and the locking claw 10 rotates toward the sector 30, the first spring 12 and the second spring 14 are released. The rotational force due to the difference in urging force (P1-P2) acts on the locking claw 10 to cause a so-called differential cushioning action, and it is possible to suppress the occurrence of an engagement hitting sound due to abrupt rotation. .

[0049]

[Effect of device]

 As described above, according to the present invention, the first and second springs extending in opposite directions on the same extension line are provided at positions facing the claw portion with the rotation fulcrum of the locking claw interposed therebetween. The first spring can function as a return spring for engaging the locking claw with the sector.

On the other hand, when the second spring is extended in conjunction with the release rod, the relationship is set such that it becomes larger than the urging force of the first spring according to the extension amount, and the brake cable is applied to the locking claw. When the traction force (F1) from the first spring is acting, the urging force of the first spring and this acting force are made higher than the urging force of the second spring, and when the traction force is not acting, Since the biasing force of the second spring is higher than that of the first spring, even if only the operation knob is operated and the release rod is displaced in the braking state, the engagement of the locking claw can be released. There is no.

Therefore, it is possible to prevent a situation in which the braking is inadvertently released.

Further, according to the present invention, the simple structure of providing a plurality of springs extending in opposite directions with respect to the locking claw prevents an inadvertent breaking without adding a special structure. Release can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic view showing a configuration of a connecting portion between a locking pawl and a release rod, which is a main portion of a parking brake device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram corresponding to FIG. 1 for explaining an aspect of a connecting portion between a locking claw and a release rod shown in FIG.

FIG. 3 is a diagram for explaining characteristics of first and second springs used in a connecting portion between the locking claw and the release rod shown in FIG. 1.

FIG. 4 is a schematic diagram for explaining another operation of the main part shown in FIG.

FIG. 5 is a schematic cross-sectional view showing the structure of a conventional parking brake device.

6 is a perspective view showing a structure of a connecting portion between a locking claw and a release rod in the parking brake device shown in FIG.

[Explanation of symbols]

1 Parking Brake Device 10 Locking Claw 10A Teeth 12 First Spring 14 Second Spring 16 Release Rod 18 Stroke Limiting Means 30 Sector 34 Teeth 40 Operating Lever 44 Operating Knob P1 In Initial Position of First Spring Biasing force P2 Biasing force of the second spring in the initial position P2a Biasing force of the second spring when the release rod is fully moved P2b Biasing force of the second spring until the release rod is fully moved

Claims (3)

[Scope of utility model registration request] 1. A sector, which is fixedly arranged on a stationary portion of a vehicle body and has a plurality of teeth, an operating lever which is swingably supported by this sector, and a displacement of an operating knob provided in the operating lever. And a rotatable locking claw for selecting a first position in which the tooth portion of the sector is engaged and a second position in which the engagement is released according to the moving direction of the release rod. In a parking brake device provided with the locking claw, a position opposite to the claw part is sandwiched by a rotation fulcrum of the locking claw, and an end portion in the extension direction is locked to the operation lever, and the locking claw is engaged with the sector. A first spring that biases the release spring and an extension line of the first spring, and ends of the release rod and the locking pawl in the extension direction are hooked to the release rod and the locking claw, respectively. On displacement A second spring that extends further and a moving position of the release rod that is fixed to the operation lever and that sets the engagement state and the engagement release state of the locking claw according to the displacement of the operation knob. Stroke restricting means respectively provided in the operation knob, and the first and second springs are pushed into the operation knob in a state in which the locking claw and the sector are engaged by the pulling force from the brake cable. The parking brake device is characterized in that the relationship of the urging force in the initial state corresponding to the case where the first spring is larger than that of the second spring is set. 2. The parking brake device according to claim 1, wherein the locking force by which the locking claw is pressed against the sector by the pulling force from the brake cable and the biasing force of the first spring are changed from the initial state by the displacement of the release rod. A parking brake device in which the urging force increased by the extension of the second spring is made larger. 3. The parking brake device according to claim 1, wherein the pulling force from the brake cable is removed, and the pressing force of the locking claw against the sector is canceled, and the release rod is displaced from the initial state to the second state. A parking brake device that rotates a locking pawl in a direction in which it is disengaged from a sector when the urging force that increases due to the expansion of the spring reaches or exceeds the urging force of the first spring.