JP3376556B2 - Manual brake device - Google Patents

Abstract

PURPOSE:To achieve the miniaturization of a device and the cost reduction by dispensing with the need of the operating members or the like for releasing the braking lock, in a manual brake device in which the base part of a brake lever is oscillatably pivoted to the base that has been fixed to a vehicle body and brakes are applied by pushing or pulling a brake cable in accordance with the oscillation of this brake lever. CONSTITUTION:A base 10 is provided with a brake link 30 by which a braking force is produced by pulling a brake cable 60 that has been connected so as to be oscillated in one direction from a non-braking position while being pushed by the base end part of a brake lever 20, and an internal-gear ratchet type locking mechanism 40 by which the brake link 30 is retained in such a condition that it is oscillated in one direction when the brake lever 20 is pushed in from the non-braking condition, and then the brake-retaining condition is released when the brake lever 20 is again pushed in.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base which is fixed to a vehicle body and pivotally supports a base of a brake lever, and extends a tip end thereof near an operator. The present invention relates to a manual brake device in which a force is applied to the tip portion to apply a brake by pushing and pulling a brake cable in accordance with swing of the brake lever. 2. Description of the Related Art As a manual brake device such as a foot-operated parking brake, for example, a base of a brake lever is pivotably supported on a base fixed to a vehicle body, and a tip end thereof is located near an operator. It is known that a brake is extended by applying a force to the tip and pushing and pulling a brake cable in accordance with the swing of the brake lever. [0003] This type of manual brake device is configured such that a brake cable is directly connected to a base end of a normal brake lever, and a braking state is maintained by a lock mechanism that prevents the brake lever that has swung in the braking direction from returning. There has been usually used a lock mechanism having an external tooth ratchet type release mechanism. That is, in the conventional manual brake device, an external ratchet plate is fixed to a base end of a brake lever, and a pawl member engaging with the ratchet plate is swingably attached to a base, and the ratchet plate is engaged. In addition to providing a spring or the like for urging in the mating direction, a release lever for pushing the ratchet plate in the disengagement direction, a release cable for operating the release lever, an operating tool, and the like are provided. . [0005] The brake lever, which has been swung in the braking direction, is held in the swinging position by the engagement between the ratchet plate and the pawl member to maintain the braking force, and thereafter the driver pulls the operating tool. The release lever swings through the release cable to push the claw member, thereby swinging the claw member in the disengagement direction, returning the brake lever to the non-braking position, and releasing the braking state. Was. [0006] In the above-mentioned prior art, a release mechanism such as a release cable and an operating tool must be provided separately, so that the structure becomes complicated and the operating tool and the like are mounted on a vehicle. However, there is a problem that an extra space for disposing is required. In addition, since the swing of the claw member in the disengagement direction at the time of the brake release operation is performed while being engaged with the ratchet plate, the pawl of the claw member is released every time the brake is released. There is a problem that the teeth are rubbed against the teeth, and the claw members are greatly worn, so that it is difficult to maintain the reliability of the brake locking operation for a long period of time. Furthermore, at the time of braking release, the brake lever becomes completely free at the moment when the claw member comes off the ratchet plate, and the brake lever returns to the non-braking position rapidly due to the restoring force of the return spring, etc., and vibration and impact noise are generated. There was also a problem that occurred. SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and provides a manual brake device which can release braking without providing a release mechanism and which is less likely to cause abrasion of members and impact noise when releasing braking. It is intended to be. In order to achieve the above object, the gist of the present invention is to pivotally pivot a base of a brake lever (30) on a base (10) fixed to a vehicle body. A manual brake in which the distal end is extended to the vicinity of the operator, a force is applied to the distal end, and a brake is applied by pushing and pulling a brake cable (60) according to the swing of the brake lever (30). In the apparatus, the brake cable (60) is swingably attached to the base (10) and pushed by the base end of the brake lever (20) to swing in one direction from a non-braking position to pull the connected brake cable (60). And a lock mechanism (40) for maintaining the braked state by swinging the brake link (30) in the one direction. The hook mechanism (40) includes a claw member (41) swingably attached to a swing end of the braking link (30), and a swinging movement of the braking link (30) of the claw member (41). An internal tooth that is arranged so as to surround a movement locus and is fixed to the base (10), and is engageable with the claw member (41) so as to prevent the braking link (30) from swinging in another direction. Are disposed adjacent to a position opposite to the internal tooth ratchet plate (42) with respect to the pawl member (41), and the braking link (30) is provided. ), A sliding plate (43) slidably attached to the sliding plate by a predetermined distance, and the sliding plate (43).
And the claw member (41), and when the slide plate (43) is located at one end of the predetermined distance, the claw member (41) is engaged in a direction in which the claw member (41) is engaged with the internal teeth. When the sliding plate (43) is located at the other end of the predetermined distance, the claw member (4
1) an urging member (44) for urging the inner tooth away from the inner tooth with a torque smaller than a friction torque for engaging the inner tooth, and the urging member (44) fixed to the base (10); A release abutting portion (12) that abuts the sliding plate (43) when the link (30) is in the non-braking position to position the sliding plate (43) at one end of the predetermined distance.
When the brake lever (20) is released when the brake link (30) is swung in one direction from a non-braking position and is in a braking state, the brake (20) is fixed to the brake lever (20). A braking contact portion (22) that presses against the sliding plate (43) with the restoring force of the return biasing means of the lever (20) to slide the sliding plate (43) to the other end of the predetermined distance; The present invention is characterized in that the manual brake device is characterized in that the manual brake device is constituted. In the manual brake device of the present invention, when the brake lever (20) and the brake link (30) are at the non-braking position (braking release position), the release abutment portion (1).
2) abuts the sliding plate (43) to position the sliding plate (43) at one end of the predetermined distance, so that the urging member (44) engages the pawl member (41) with the internal teeth of the ratchet plate. In the direction of urging in the direction of Therefore, when the brake lever (20) is pushed in the non-braking state and swings in the braking direction, the brake link (30) is also pushed by the brake lever (20) and swings in the braking direction. The pawl member (41) moves while slightly oscillating while moving over the internal teeth of the ratchet plate, and moves the brake lever (2).
When 0) is released, it engages with the internal teeth of the ratchet plate at that position to prevent swinging of the brake link (30) in the release direction (ie, release of brake). In this braking state, immediately after the brake lever (20) is released, the brake lever (2) is released.
0) only attempts to return to the non-braking position by the restoring force of the return biasing means, and the braking contact portion (22) provided on the brake lever (20) is pressed against the sliding plate (43). After the sliding plate (43) slides to the other end of the predetermined distance, the return of the brake lever (20) is prevented. For this reason, after the braking operation is performed and the brake lever (20) is released, the urging member (44) is moved to the pawl member (41).
Is urged in a direction away from the internal teeth of the ratchet plate. However, since the biasing torque of the biasing member (44) is smaller than the friction torque of engaging the pawl member (41) with the internal teeth, the engagement of the pawl member (41) with the internal teeth at this time. Is not released, and the braking state is reliably maintained. The release of the braking state can be performed easily and smoothly by slightly pushing the brake lever (20) back in the braking direction. That is, when the brake lever (20) is slightly pushed and the brake link (30) slightly swings in the braking direction, the press-contact state between the pawl member (41) and the ratchet plate is released. Applies only a biasing torque in the direction in which the biasing member (44) is disengaged, and the pawl member (41) separates from the internal teeth without instantaneous rubbing. Therefore, if the brake lever (20) is thereafter returned to the original non-braking position by relying on the restoring force of the return biasing means and the tension of the brake cable (60), the braking link (30) also returns to the original non-braking position. Brake is released. When the braking link (30) returns to the non-braking position in this way, the release contact portion (12) provided on the base (10) comes into contact with the sliding plate (43), so that the sliding is achieved. The moving plate (43) returns to the one end position of the predetermined distance, and the urging member (44) also returns to the posture for urging the pawl member (41) in the engaging direction.
If 0) is pressed, braking can be performed by the same operation any number of times. An embodiment of the present invention will be described below with reference to FIGS. The manual brake device of the present embodiment is a foot-operated type. As shown in FIGS. 1 and 2, a base of a brake lever 20 is attached to a base 10 fixed to a vehicle body by a pivot shaft 2.
The base 10 is provided with a braking link 30 which is pivotally supported by 1 and is pushed by the brake lever 20 to swing and pull the brake cable 60. In addition, the swing of the braking link 30 in the return direction is prevented and the braking state is prevented. It is provided with a lock mechanism 40 for maintaining. In this case, as shown in FIG. 2, the base 10 has a box shape formed by press molding or the like, and has a side plate 11 fixed along an inner surface thereof. The brake lever 21 is supported, and the base of the brake lever 20 and the like are provided. A pin 12 is fixed to a lower portion of the inside of the base 10 to form a release contact portion according to the present invention. The function of the pin 12 will be described later. In this case, the brake lever 20 has a plate-like shape, as shown in FIG. 2, and has a tip end extending to the foot of the vehicle driver and a pedal 21 at the tip.
Is mounted, and a braking contact portion 22 is formed at the base end. The function of the braking contact portion 22 will be described later. In this case, a tension spring 23 is stretched between the distal end side of the brake lever 20 and the base 10 (or the vehicle body), and urges the brake lever 20 in the return direction. As shown in FIG. 2, the brake link 30 includes two plates 30a and 30b arranged so as to sandwich the base of the brake lever 20 in this case.
And is pivotally supported coaxially with the pivot shaft 21 by pins 34, 35 and the like, and is swingable with respect to the base 10 and the brake lever 20. A lower portion of the swinging end of the brake link 30 is provided with a mounting member 36 by a pin 36a.
The brake cable 60 is connected via the attachment 36 as shown in FIG. The brake link 30 is configured to swing together with the brake lever in the braking direction (clockwise in FIG. 1) when the pins 31, 33, etc. are pressed by the base of the brake lever 20. As shown in FIGS. 1 and 2, the lock mechanism 40 includes a pawl member 41, an internal tooth ratchet plate 42, a slide plate 43, a biasing member 44, and the pin 12 (a contact portion at the time of release). ) And the braking contact portion 22. In this case, as shown in FIG. 3, the pawl member 41 is pivotally supported by a pin 32 above the swinging end of the braking link 30. The swinging end is provided with an internal ratchet plate 42. A claw 41a meshing with the internal teeth 42a is formed,
A recess 4 into which one side of the urging means 44 fits in the inner end surface of the base.
1b is formed. The concave portion 41b has a shape having a portion into which a coil winding portion of the urging member 44 described later fits and a portion into which a coil end fits. The internal tooth ratchet plate 42 is
1 is fixed to the base 10 so as to surround the movement trajectory accompanying the swing of the braking link 30, and the direction in which the swing of the braking link 30 in the return direction (counterclockwise direction in FIG. 1) is prevented. The internal teeth 42a are formed on the inner end surface. The sliding plate 43 is disposed adjacent to the claw member 41 at a position opposite (inside) to the internal ratchet plate 42 and is slidably attached to the braking link 30 by a predetermined distance. It is a thing. That is, in this case, as shown in FIG. 3, two long holes 43a and 43b in the same direction and the same shape are formed on the sliding plate 43, and the pins 37 and 38 fixed to the braking link 30 are respectively provided. It is slidably fitted in the long holes 43a, 43b, and can move linearly in the vertical direction with respect to the brake link 30 by the length (predetermined distance) of these long holes 43a, 43b. An urging means 4 is provided on the inner end surface of the sliding plate 43 at a position facing the concave portion 41b of the claw member 41.
4 is formed with a concave portion 43c into which the other side fits. Like the claw member 41, the concave portion 43c has a shape having a portion into which a coil winding portion of the urging member 44 described later fits and a portion into which the coil end fits. In this case, the biasing member 44 is formed by winding a wire made of spring steel or the like in a coil shape.
b and the recess 43 c of the sliding plate 43. The mounting position of the urging member 44 (the recess 41
b or the position and shape of the recess 43c) are set as follows. That is, as shown in FIG.
When 3 is located at the uppermost end, the position of the force line of the restoring force of the urging member 44 (indicated by a dashed line in FIG. 3) is below the rotation center of the claw member 41, as shown in FIG. When the sliding plate 43 is located at the lowermost end, the position of the force line of the restoring force of the urging member 44 (indicated by a one-dot chain line in FIG. 4) is set to be above the rotation center of the claw member 41. Have been. The spring characteristics of the biasing member 44 are set such that the biasing torque is smaller than the friction torque of the engagement of the claw member 41 with the internal teeth 42a. The pin 12 (contact portion at the time of release) is
When the braking link 30 is in the non-braking position, the sliding plate 43 contacts the lower end of the sliding plate 43 to position the sliding plate 43 at the uppermost end. When the brake lever 20 is released in the braking state when the brake lever 20 is released in the braking direction, the restoring force of the tension spring 23 presses the upper end of the sliding plate 43 to slide the sliding plate 43 to the lowermost end. . Next, the operation will be described. Brake lever 20
When the brake link is in the non-braking position (the position shown in FIG. 1) and the brake cable 60 is loose, the pin 12 contacts the sliding plate 43 to position the sliding plate 43 at the uppermost end. The urging member 44 urges the claw member 41 in a direction in which the pawl member 41 engages with the internal teeth 42a of the ratchet plate 42 as shown in FIG. For this reason, the brake lever 20 is depressed from this non-braking state and the braking direction (FIG.
In this case, the brake link 30 is also pushed by the brake lever 20 and swings in the braking direction. At this time, the pawl member 41 slightly swings while climbing over the internal teeth 42 a of the ratchet plate 42. When the brake lever 20 is released, the brake lever 20 is engaged with the internal teeth 42a of the ratchet plate 42 at that position to prevent the brake link 30 from swinging in the release direction (that is, release the brake). Therefore, the brake cable 60 is contracted to generate a sufficient braking force. Immediately after the brake lever 20 is released in this braking state, only the brake lever 20 attempts to return to the non-braking position by the restoring force of the tension spring 23, and the braking contact portion 22 provided on the brake lever 20 Is pressed against the upper end of the sliding plate 43, so that the sliding of the brake lever 20 is prevented after the sliding plate 43 slides to the lowermost end. Therefore, after the braking operation is performed and the brake lever 20 is released, the urging member 44 urges the claw member 41 in a direction away from the internal teeth 42a of the ratchet plate 42 as shown in FIG. . However, since the urging torque of the urging member 44 is smaller than the friction torque of the claw member 41 engaging the internal teeth 42a, even if the direction of the urging torque of the claw member 41 is switched, The engagement with the teeth 42a is not released, and the braking state is reliably maintained. The release of the braking state can be easily and smoothly performed by slightly depressing the brake lever 20 again in the braking direction and returning it. That is, when the brake lever 20 is slightly pressed and the brake link 20 slightly swings in the braking direction, the press-contact state between the claw member 41 and the internal teeth 42a of the ratchet plate 42 is released. Only the biasing torque in the direction of releasing the engagement of the member 44 is applied, and the claw member 41 is separated from the internal teeth 42a without instantaneous rubbing. Therefore, if the brake lever 20 is thereafter returned to the original non-braking position by relying on the restoring force of the tension spring 23 and the tension of the brake cable 60, the braking link 30 also returns to the original non-braking position and braking is released. When the braking link 30 returns to the non-braking position in this manner, the pin 12 provided on the base 10
Abuts on the lower end of the sliding plate 43, the sliding plate 43 returns to the uppermost position, and the urging member 44 also returns to the posture for urging the claw member 41 in the engaging direction as shown in FIG. If the brake lever 20 is pressed again, braking can be performed by the same operation any number of times. As described above, in the manual brake device described above, the brake lock state is released by operating the brake lever 20 again (by a so-called double action). There is no need to provide the configuration described above, and the structure can be simplified, cost can be reduced, and the installation space of the device in the vehicle can be reduced. The ratchet plate 4 of the claw member 41
2 can be released without rubbing each other, so that the claw 41a of the claw member 41 or the internal teeth 42a of the ratchet plate 42 is less worn, and the reliability of the brake locking operation can be easily secured for a long period of time. When the brake lock state is released, the brake lever 20 is once depressed and then returned, so that the brake lever 20 and the brake link 30 are released.
Will gradually return to the non-braking position in accordance with the withdrawal operation of the driver's foot, which also has the effect of making it difficult to generate vibrations and impact sounds when the braking is released. The present invention is not limited to the above-described embodiment, but may have various aspects. For example, the urging member 44 is not limited to the coil spring as described above, and the pawl member 41 and the sliding plate 4
3 may be used, or an elastic body such as rubber fitted in a compressed state between the claw member 41 and the sliding plate 43 may be used. In any case, the present invention can be implemented as long as the direction of the biasing torque can be changed depending on the position of the sliding plate 43. According to the manual brake device of the present invention, the brake lock state is released by operating the brake lever again (by a so-called double action), so that the release cable and the operating tool for releasing the lock are released. There is no need to provide such a separate structure, and the structure can be simplified, the cost can be reduced, and the installation space of the device in the vehicle can be reduced. Further, since the engagement of the claw member with the ratchet plate can be released without rubbing, the abrasion of the claw of the claw member or the internal teeth of the ratchet plate is reduced, and the reliability of the braking lock operation is improved over a long period of time. Easy to secure. When releasing the brake lock state,
Since the brake lever is once pressed and then returned, the brake lever and the brake link gradually return to the non-braking position according to the retraction operation of the driver's foot, etc.
There is also an effect that vibration and impact sound hardly occur at the time of release of braking.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a main part of a manual brake device according to one embodiment of the present invention. FIG. 2 is an exploded perspective view showing an overall configuration of a manual brake device according to one embodiment of the present invention. FIG. 3 is a side view showing an operation of a lock mechanism in the manual brake device according to one embodiment of the present invention. FIG. 4 is a side view showing an operation of a lock mechanism in the manual brake device according to one embodiment of the present invention. DESCRIPTION OF SYMBOLS 10 ... Base 12 ... Pin (abutment part at release) 20 ... Brake lever 22 ... Abutment part at braking 23 ... Tension spring (return biasing means) 30 ... Brake link 40 ... Lock mechanism 41 ... Claw Member 42 Internal ratchet plate 43 Sliding plate 44 Biasing member

Claims (1)

(57) [Claims 1] A base of a brake lever is pivotally supported on a base fixed to a vehicle body so as to be swingable, a tip end thereof is extended near an operator, and a force is applied to the tip end. In addition, in a manual brake device that applies a brake by pushing and pulling a brake cable according to the swing of the brake lever, the manual brake device is swingably attached to the base, pushed by a base end of the brake lever, and moved from a non-braking position. A brake link that generates a braking force by pulling a connected brake cable by swinging in one direction and a lock mechanism that holds the braked state by swinging the brake link in the one direction. The lock mechanism is disposed on the base such that the claw member is swingably attached to a swing end of the brake link, and a movement trajectory of the claw member accompanying the swing of the brake link is provided on the base. An internal tooth ratchet plate having an inner end surface formed on an inner end face, the internal tooth being fixed and being engageable with the pawl member so as to prevent the brake link from swinging in the other direction; A sliding plate disposed adjacent to a position opposite to the tooth ratchet plate and slidably mounted on the braking link by a predetermined distance, and disposed between the sliding plate and the claw member; When the sliding plate is located at one end of the predetermined distance, the pawl member is in a posture for urging in a direction of engaging with the internal teeth, and the sliding plate is positioned at the other end of the predetermined distance. A biasing member that is configured to bias the claw member in a direction away from the internal teeth with a torque smaller than a friction torque for engaging the internal teeth, and the braking link fixed to the base, When in the non-braking position A release abutting portion that abuts the sliding plate to position the sliding plate at one end of the predetermined distance, and is fixed to the brake lever, and the braking link swings in one direction from a non-braking position to apply braking. When the brake lever is released while in the state, the brake lever is pressed against the slide plate by the restoring force of the return biasing means of the brake lever to slide the slide plate to the other end of the predetermined distance. A manual brake device comprising a contact portion.