JP4169751B2 - Parking brake device - Google Patents

Description

  The present invention holds the shaft with the operation handle fixed to the base end side and the brake cable connected to the tip end side so that the base bracket surrounds, and pulls the operation handle along the longitudinal direction of the base bracket. The present invention relates to a parking brake device in which a brake cable is actuated by pulling a brake cable.

An example of a conventional parking brake device is shown in FIG.
That is, the parking brake device 100 pulls the brake cable 102 by operating the operation handle 101 to operate the brake. This type of parking brake device 100 includes an operating rod 104 that is slidably supported in a guide member 103, an operating handle 101 is attached to the proximal end of the operating rod 104, and a brake cable 102 is attached to the distal end side. It is connected. Further, a ratchet (not shown) is formed on the operation rod 104, and a nail (not shown) that engages with the ratchet is provided on the guide member 103.

  In this parking brake device 100, by pulling the operating rod 104 through the operation handle 101, the brake cable 102 is pulled and the braking force of the brake works. When the operating handle 101 is released while the operating rod 104 is pulled, the operating rod 104 is locked by engaging the nail with the ratchet, and the braking force of the brake is maintained.

  The braking force can be released by twisting the operating rod 104 to disengage the nail from the ratchet and then returning the operating rod 104 to its original position by the tension of the brake cable 102.

  By the way, such a parking brake device is usually provided in front of the driver's seat of the vehicle, but since the operation handle and a part of the operation rod protrude to the driver side during the operation of the brake, There is a problem of getting in the way.

  This protruding state is also an obstacle to enable a walk-through between the driver seat and the passenger seat.

  In addition, since a rotation operation of the operation handle is necessary, a space in which the operation handle can be rotated without inconvenience is necessary. However, it is often a problem on the vehicle layout to provide a space for rotating the handle.

  The present invention has been made paying attention to such problems of the conventional technology, and an object of the present invention is to provide a parking brake device that can be miniaturized.

The gist of the present invention for achieving the object lies in the inventions of the following items.
[1] A shaft (20) enclosed in the base bracket (10);
An operation handle (30) provided on one end side (20a) of the shaft (20);
A brake cable (2) connected to the other end side (20b) of the shaft (20),
The brake cable (2) is pulled out through the shaft (20) by pulling the operation handle (30), and the shaft (20) and the brake cable (to the base bracket (10) at a position where the brake is operated. In the parking brake device (1) where the position of 2) is fixed,
A ratchet plate (40) having a ratchet (41) extending in the longitudinal direction of the base bracket (10);
A locking pole (52) swingable to engage and disengage from the ratchet (41);
A biasing member (53) for applying a biasing force in a direction to lock the locking pole (52) to the ratchet (41);
A release pole (80) for applying a force against the biasing force to the locking pole (52) locked to the ratchet (41) to release the locking with the ratchet (41);
A claw portion (52a) that is provided at one end of the locking pole (52) and locks with the ratchet (41);
A locking portion (52b) provided at the other end of the locking pole (52) and extending toward the release pole (80);
An operation button (31) that is slidably disposed on the operation handle (30) and that moves the release pole (80);
The release pole (80) is in a state in which after the operation button (31) is operated, the engagement between the pawl portion (52a) of the engagement pole (52) and the ratchet (41) is released. By maintaining the contact state of the pawl (52) with the tip (52c) of the locking portion, the release of the locking between the claw portion (52a) of the locking pole (52) and the ratchet (41) is maintained. A parking brake device (1).

[2] When the brake cable (2) is pulled back from the ratchet (41) of the base bracket (10), the claw portion (52a) of the locking pole (52) comes into contact, and the release The parking brake device according to [1], wherein a posture release portion (40c) for releasing a contact state between the pawl (80) and the engaging portion (52b) of the engaging pawl (52) is provided. (1).

The present invention operates as follows.
According to the parking brake device (1) of [1], the operation handle (30) fixed to the base end (20a) side of the shaft (20) included in the base bracket (10) is manually moved to the base bracket ( When pulled in the longitudinal direction of 10), the brake cable (2) connected on the tip end (20b) side is pulled to operate the brake.

A ratchet plate (40) fixed to the base bracket (10) is located in a direction in which the shaft (20) is pulled in the direction, and the ratchet (41) formed on the ratchet plate (40) When locking pawl (52) reaches the part, the locking pawl (52) since the receiving urging force of a direction engaged with the ratchet (41) from the biasing member (53), ensure the ratchet (41) Can be locked to.

  When the operating handle (30) is pulled until the braking force of the brake is sufficiently applied and then released, the brake cable (2) is slightly pulled back, so that the shaft (20) returns by that amount. By this return, the locking pole (52) is locked to the ratchet (41), and the position of the shaft (20) is fixed. As a result, the brake is maintained in a braked state.

When you release the braking of the brake, the operation button (31) of the operating handle (30) Then, since the release Paul (80) applying a force against the biasing force to the locking pawl (52), The locking with the ratchet (41) can be released. Even if the operation button (31) is operated without pulling the operation handle (30), the release mechanism does not operate. Therefore, even if the operation button (31) is operated by mistake, braking of the brake is not released.

The lock pole (52) released from the latch with the ratchet (41) by the release pole (80) is in a position released from the lock with the release pole (80). This is maintained by the supporting portion tip (52c) of the locking pole (52) being in contact with and supported by the release pole (80) by the urging force of the member (53).

When the locking pole (52) is unlocked from the ratchet (41), the shaft (20) is pulled back to the brake cable (2). Therefore, if the shaft (20) is returned while being pulled, braking of the brake is performed. Canceled. While the shaft (20) is pulled back, the locking pole (52) is oriented in a direction to separate the locking portion tip (52c) of the locking pole (52 ) from the release pole (80) by the posture release portion (40c). The shaft (20) can be pulled back smoothly.

According to the parking brake system according to the present invention, and that Organization to maintain braking of the brake locks the locking pawl is engaged with the ratchet of the ratchet plate, machine you release the engagement between the ratchet locking pawl structure Since the shaft is included in the shaft and the base bracket is included in the shaft, the size can be reduced, and the operation handle does not rotate when the brake is released, so that the space can be saved.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.
1 to 9 show an embodiment of the present invention.
The parking brake device 1 shown in FIG. 1 holds the base bracket 10 so as to surround the shaft 20. The base bracket 10 is a combination of two horizontally shaped metal plates that are joined together and fixed by a rivet 11. The shaft 20 held by the base bracket 10 has an operation handle 30 fixed to the proximal end portion 20a side, and one end portion of the brake cable 2 (see FIG. 4) is connected to the distal end portion 20b side. The other end of the brake cable 2 is connected to a brake unit (not shown). By pulling the operation handle 30 along the longitudinal direction of the base bracket 10, the brake cable 2 is pulled and the brake is operated. Braking.

  As shown in FIGS. 2 and 3, the base bracket 10 has a substantially “B” cross section, and the internal space extends straight in the longitudinal direction. At the upper joint where the two bracket members 10a and 10b constituting the base bracket 10 are fixed to each other, a horizontally long ratchet plate 40 is sandwiched between them and fixed together with the bracket members 10a and 10b by the rivet 11. Has been. Therefore, the ratchet plate 40 extends in the longitudinal direction of the base bracket 10.

  A ratchet 41 is formed on the lower side of the ratchet plate 40 in the longitudinal direction. The ratchet 41 is formed from a portion slightly closer to the center than the front end portion 40a of the ratchet plate 40 to a portion extending from the center to the rear end portion 40b side. From the portion where the formation of the ratchet 41 is completed on the rear end portion 40b side, a downward inclined portion 40c (posture release portion) that is gently inclined downward toward the rear end portion 40b is formed. A flat portion 40d having no inclination is formed from the portion where the downward inclined portion 40c ends. From the portion where the flat portion 40d ends, an upward inclined portion 40e inclined upward is formed and reaches the rear end portion 40b. The ratchet plate 40 formed in this way is arranged at a position where a portion from the rear end portion 40 b to a part of the ratchet 41 faces the internal space of the base bracket 10.

  The shaft 20 is a metal cylinder having a substantially “B” cross section, but a notch 21 is formed from a portion slightly closer to the tip 20b to the tip 20b than the center of the upper surface 20c. Is formed. This notch portion 21 allows a locking pole 52, which will be described later, to protrude from the inside of the shaft 20 to be engaged with and disengaged from the ratchet 41, and to contact the downward inclined portion 40c and the flat portion 40d. Yes.

  On the inner side of the shaft 20, an engagement / disengagement mechanism that allows the locking pole 52 to be engaged with and disengaged from the ratchet 41 to fix the position of the shaft 20 with respect to the base bracket 10, and A release mechanism for releasing the lock is provided.

  The engaging / disengaging mechanism includes a pair of pull brackets 50, 50 extending in the longitudinal direction along both side surfaces of the shaft 20, and the engagement pivotally supported by a pivot 51 fixed to the pull brackets 50, 50. A stop pole 52 and a torsion spring 53 (biasing member) that applies an urging force in a direction to lock the locking pole 52 to the ratchet 41 to the locking pole 52 are configured.

  Each of the pull brackets 50 is formed with a horizontally long first guide hole 50c extending in the longitudinal direction from the approximate center toward the distal end portion 50a on the operation handle 30 side. The shaft pin 22 is slidably inserted in the first guide hole 50c. Both ends of the shaft pin 22 are fixed to both side surfaces of the shaft 20. Therefore, the shaft 20 and the pull bracket 50 can move relatively within a range in which the shaft pin 22 can move in the first guide hole 50c. A loose bracket 23 is attached to the shaft pin 22. A spring plate 24 a is attached to the loose bracket 23. A similar spring plate 24b is provided on the release pole 80 side described later, and a coil spring 25 is interposed between the spring plates 24a and 24b.

  The rear end portions 50b of the pull brackets 50 on both sides are connected by a pivot 51. The locking pole 52 has a substantially central portion pivotally supported by the pivot 51, and the rear end upper portion near the rear end portion 50b of the pull bracket 50 is engaged with and disengaged from the ratchet 41 as described above. It is formed as a claw portion 52a that comes into contact with the portion 40c or the flat portion 40d.

A locking portion 52b that can be locked to a release pole 80 described later is formed on the opposite side of the claw portion 52a with the pivot 51 as a boundary. The locking portion 52b is formed in a shape with the tip portion facing downward. The front end is released from being engaged with the release pole 80 and is supported so as to be placed on the front end of the locked portion 81 of the release pole 80 when the engagement with the ratchet 41 is released. A substantially flat release posture maintaining portion 52c (tip of the locking portion) is formed.

  A pin 54 is fixed to the pull brackets 50 and 50 behind the pivot 51, and a torsion spring 53 is attached to the pin 54. The torsion spring 53 has a lower end attached to the pull bracket 50, an upper end abutting on the locking pole 52 from below, and a claw portion 52 a side rotating upward to lock the ratchet 41. An urging force is applied to the locking pole 52. Further behind the torsion spring 53, the brake cable 2 is directly connected to the rear end 50b.

  The release mechanism for releasing the lock of the lock pole 52 from the ratchet 41 changes the direction of the lock pole 52 locked to the ratchet 41 to release the lock from the ratchet 41 and the shaft 20. The release pole 80 is fixed to the rear end side, and the release rod 70 is connected to the front end side so that a predetermined amount of sliding is possible.

  The release plate 60 is integrally formed with a plate-like parallel part 61 that contacts the upper and lower sides of the pull bracket 50 and extends parallel to the longitudinal direction of the shaft 20, and the upper and lower parallel parts 61 on the tip side. On the other hand, it consists of a plate-like extending portion 62 extending in parallel. A laterally long second guide hole 63 is formed in the extending portion 62 in the direction in which the extending portion 62 extends. The release plate 60 is disposed so that the extending portion 62 is positioned ahead of the distal end portion 50a of the pull bracket 50, and the release rod 70 is slidably connected to the second guide hole 63. Yes.

The release pole 80 and the spring plate 24b are fixed to the rear end portion 60b of the release plate 60. Release pawl 80 is capable of engaging the engagement portion 81 together with the locking portion 52b of the locking pawl 52 is formed. Engaged portion 81 is formed in a shape tip facing upward. Portion in contact with each other when the locking portion 52b of the engaging portion 81 and the latching pawl 52 is engaged, the release pawl 80 by the release plate 60 is moved to the extended portion 62 side in the same direction when moving, the locking pawl 52 by the release pawl 80 is pivoted, and is formed in a shape locking of the locking portion 81 and the engaging portion 52b is released.

  The release plate 60 can be moved by operating the operation handle 30 via the release rod 70. The release rod 70 extends to the inside of the operation handle 30. The operation handle 30 includes an operation button 31 for operating the release rod 70 and a link 32 for pulling the release rod 70 in conjunction with the operation of the operation button 31.

  The link 32 has a “<” shape, and a bent portion is pivotally supported by a pivot. One end of the link 32 is connected to the tip 71 of the release rod 70, and the other end is in contact with the operation button 31. Accordingly, when the link 32 is pushed into the operation handle 30, the link 32 rotates and the release rod 70 is pulled.

By pulling the release rod 70, the release plate 60 is moved. As described above, the locking pole 52 is unlocked from the ratchet 41, so that the shaft 20 can be returned while being pulled by the brake cable 2. Yes, the brake can be released. The base bracket 10 is provided with a switch 90 and a switch link 91 that detect the shaft 20 by the contact of the distal end portion 20b at a position that contacts the distal end portion 20b of the shaft 20 when the braking of the brake is released. Has been. The switch link 91 is rotatable about a shaft 92, and is rotated by contact and separation of the shaft 20, and the switch 90 is turned on / off by this rotation of the switch link 91, so that the shaft 20 can be detected. .

Next, the operation of the parking brake device according to the present embodiment will be described.
4 and 5 show a state in which the parking brake device 1 is not braked.
In this state, the shaft 20 is completely accommodated in the base bracket 10. The pull bracket 50 and the release plate 60 to which the brake cable 2 is connected are located closest to the tip 20b side of the shaft 20. The locking pole 52 is located rearward from the upward inclined portion 40e of the ratchet plate 40 and is urged upward from below by the torsion spring 53. For this reason, the locking part 52 b is locked to the release pole 80.

In order to brake the parking brake device 1, the operation handle 30 may be gripped and pulled in the direction in which the shaft 20 is pulled out from the base bracket 10 (arrow A direction). When the shaft 20 is pulled out and the shaft pin 22 comes into contact with the end edge of the first guide hole 50c, the pull bracket 50 is also pulled together with the shaft 20. As a result, the brake cable 2 is pulled, so that the parking brake device 1 starts to exert a braking force.

  As the pull bracket 50 is pulled, the locking pole 52 contacts the upward inclined portion 40e of the ratchet plate 40, and further reaches the portion where the ratchet 41 is formed via the flat portion 40d and the downward inclined portion 40c (see FIG. 6). After the locking pole 52 reaches this portion, when the pulling of the operation handle 30 is stopped, the pull bracket 50 is slightly pulled back by the force to pull back the brake cable 2, and the pawl portion 52a of the locking pole 52 is ratchet. 41, the position of the pull bracket 50 is fixed. Thereby, the drawing amount of the brake cable 2 is fixed, and the braking force according to the drawing amount is maintained. That is, the brake is locked.

  In FIG. 6, what is indicated by a symbol B indicates a stroke by which the release rod 70 is pulled when the operation button 31 is pushed. This stroke B is for preventing the unlocking of the brake due to an erroneous operation of the operation button 31. As will be described later, even if the release rod 70 is pulled only by the stroke B, the claw portion 52a, the ratchet 41, Since the lock of the brake is not released, the brake is not released.

  When the brake is locked, the parking brake device 1 applies a force to the operation handle 30 to push the shaft 20 into the base bracket 10 (a force in the direction opposite to the arrow A direction). Has a cushioning function to absorb. FIG. 7 shows a state in which a force in the direction opposite to the arrow A direction is applied to the operation handle 30 and the shaft 20 is pushed in. At this time, since the claw portion 52a and the ratchet 41 remain locked, the position of the pull bracket 50 does not change. On the other hand, since the above-described force is applied to the shaft 20, the shaft pin 22 slides in the first guide hole 50c toward the rear end portion 50b.

  By this sliding, the coil spring 25 interposed between the spring plate 24a and the spring plate 24b is elastically deformed and compressed. Although the magnitude | size by which the coil spring 25 is compressed is not specifically limited, For example, it is about 40 mm. The force applied to the operation handle 30 is absorbed by elastically deforming the coil spring 25. Since the cushion function works in this way, even if the passenger accidentally hits the knee or a part of the body against the operation handle 30, the injury can be reduced.

FIG. 8 illustrates an operation for releasing the locked parking brake device 1. When releasing the lock, the operation button 31 is pushed with a finger. When the operation button 31 is pressed, the release rod 70 is pulled in the arrow A direction via the link 32, and the release plate 60 connected to the release rod 70 is also pulled in the same direction. Thus, by moving the release pawl 80 is the same direction, with the locking is released and the locked portion 81 of the locking portion 52b and the release pawl 80 of the locking pawl 52 as shown, the pawl portion 52a The ratchet plate 40 is unlocked from the ratchet 41. At this time, release position maintaining portion 52c is so supported while abutting rests on the engaged portion 81, the engagement of the pawl portion 52a and the ratchet 41 after releasing the operating button 31 The released state is maintained. In this state, the claw portion 52a and the ratchet 41 are not in contact with each other, and therefore the claw portion 52a and the ratchet 41 are not worn away when the shaft 20 is returned.

Next, when the shaft 20 is housed in the base bracket 10 in accordance with the force to pull back the brake cable 2, the claw portion 52a comes into contact with the downward inclined portion 40c, the flat portion 40d, and the upward inclined portion 40e in this order. However, returning to the state of FIG. 5 together with the pull bracket 50, the braking force of the parking brake device 1 is released. When the claw portion 52a reaches the downward inclined portion 40c, the direction of the locking pole 52 is changed in a direction to separate the release posture maintaining portion 52c from the release pole 80, and the maintenance of the release posture is released. This state is maintained while the claw portion 52a is in contact with the portion up to the flat portion 40d. Thus, a release position maintaining portion 52c and the engaged portion 81 is not in a locked state, it is possible to return smoothly. Locking pawl by a torsion spring 53 52 Since releasing position maintaining portion 52c is urged in a direction to engage with the engaged portion 81, the pawl portion 52a reaches the upward inclined portion 40e upwardly inclined portion with the claw portion 52a is increased in accordance with the inclination of 40e turned down releasing position maintaining portion 52c so locked to the locking portion 81. In a state where the shaft 20 has returned completely, releasing position maintaining portion 52c is in a state in which sealed completely engaged with the engaged portion 81.

  The shaft 20 completely accommodated in the base bracket 10 is detected by contacting the switch link 91 and rotating the switch link 91 so that the switch link 91 turns on the switch 90.

1 is a side view showing a parking brake device according to an embodiment of the present invention. It is the DD sectional view taken on the line of FIG. It is the II sectional view taken on the line of FIG. It is a top view which shows the parking brake apparatus which concerns on one embodiment of this invention. It is explanatory drawing explaining the brake release state in the parking brake apparatus which concerns on one embodiment of this invention. It is explanatory drawing explaining the brake braking state in the parking brake apparatus which concerns on one embodiment of this invention. It is explanatory drawing explaining the cushion function of the parking brake apparatus which concerns on one embodiment of this invention. It is explanatory drawing explaining cancellation | release of the brake braking in the parking brake apparatus which concerns on one embodiment of this invention. It is explanatory drawing explaining cancellation | release of the brake braking in the parking brake apparatus which concerns on one embodiment of this invention. It is a perspective view which shows a prior art example.

Explanation of symbols

B ... Stroke 1 ... Parking brake device 2 ... Brake cable 10 ... Base bracket 10a, 10b ... Bracket member 11 ... Rivet 20 ... Shaft 20a ... Base end 20b ... tip 20c ... top 21 ... notch 22 ... shaft pin 23 ... loose bracket 24a ... spring plate 24b ... spring plate 25 ... coil spring 30 .. Operation handle 31 ... Operation button 32 ... Link 40 ... Ratchet plate 40a ... Tip 40b ... Rear end 40c ... Down slope (posture release part)
40d ... Flat part 40e ... Upward inclined part 41 ... Ratchet 50 ... Pull bracket 50a ... Tip part 50b ... Rear end part 50c ... First guide hole 51 ... Axis 52 ... Locking pole 52a ... Claw part 52b ... Locking part 52c ... Release posture maintaining part (tip of locking part)
53 ... Torsion spring 54 ... Pin 60 ... Release plate 60b ... Rear end 61 ... Parallel part 62 ... Extension part 63 ... Second guide hole 70 ... Release rod 71 ... tip 80 ... release pawl 81 ... engaged portion 90 ... switch 91 ... switch link 92 ... shaft

Claims (2)

A shaft included in the base bracket;
An operation handle provided on one end of the shaft;
A brake cable connected to the other end of the shaft;
In the parking brake device in which the position of the shaft and the brake cable with respect to the base bracket is fixed at a position where the brake cable is pulled out via the shaft by pulling the operation handle and the brake is operated,
A ratchet plate having a ratchet extending in the longitudinal direction of the base bracket;
A locking pole swingable to engage and disengage from the ratchet;
A biasing member that applies a biasing force in a direction of locking the locking pole to the ratchet;
A release pole that releases a lock with the ratchet by applying a force against the biasing force to the lock pole locked to the ratchet,
A claw portion provided at one end of the locking pole and locked with the ratchet;
A locking portion provided at the other end of the locking pole and extending toward the release pole;
An operation button that is slidably disposed on the operation handle and moves the release pole is provided.
The release pole maintains a contact state with the locking portion tip of the locking pole in a state in which the locking pawl and the ratchet are unlocked after the operation button is operated. The parking brake device is characterized in that the release of the engagement between the pawl portion of the engagement pole and the ratchet is maintained. When the brake cable is pulled back from the ratchet of the base bracket, the pawl portion of the locking pole comes into contact, and the contact state between the release pole and the locking portion of the locking pole is released. The parking brake device according to claim 1, further comprising a posture release unit .

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