JPH0745394Y2 - Parking brake operating device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a parking brake operating device, and more particularly to a technique for reducing a hitting sound generated when a pole moves while overcoming ratchet teeth while operating the parking brake operating device. Is.

2. Description of the Related Art One type of parking brake operating device includes (a) an operating lever connected to a parking brake operating portion via a brake cable, and (b) supporting the operating lever rotatably around a first axis. A sector in which a ratchet is formed along an arc shape centered on the first axis,
(C) a pole attached to the operation lever so as to be rotatable about a second axis parallel to the first axis and meshed with the ratchet; and (d) a pole capable of being pushed into the tip of the operation lever. A knob; and (e) a release rod that is connected to the knob at one end and that pushes the knob to rotate the pole around the second axis to release the meshing with the ratchet. (F)
There is one in which the knob is always provided with a spring protruding from the tip of the operating lever and biasing the pawl so as to engage with the ratchet. In such a parking brake operating device, the operating lever is
The parking brake actuating portion is actuated by rotating the brake cable from a predetermined original position to a braking position where the brake cable is tightened.
When the pawl moves over the ratchet teeth against the biasing force of the spring, the rotation of the operating lever toward the braking position is allowed, and the pawl is meshed with the ratchet at the braking position. As a result, rotation of the operating lever in the direction toward the original position is blocked, and the operating state of the parking brake operating unit is maintained. Further, when the knob is pushed in and the engagement between the pawl and the ratchet is released, rotation of the operation lever in the direction toward the original position is allowed and the operation lever is returned from the braking position to the original position. The operation of the parking brake operating unit is released.

In such a type of parking brake operating device, in general, the knob is inadvertently inadvertently pushed to release the engagement between the pawl and the ratchet and release the operating state of the parking brake operating portion. In order to prevent this from happening, it is usual to set the strength to a predetermined value or more so that the knob will not be pushed in when the biasing force of the spring is light. However, when the biasing force of the spring that protrudes the knob is set to be large in this way, the meshing load with respect to the ratchet at the tooth tip of the pole that is applied by using this spring also increases, so that the operating lever moves. There has been a problem that a large striking sound is generated when the pole moves while overcoming the ratchet teeth as the pole is rotated from the original position to the braking position.

On the other hand, the lever ratio of the pawl, that is, the ratio of the length from the second shaft to the tip of the pawl to the length from the point of action where the biasing force is applied by the spring to the second shaft is set to be large. Therefore, it is possible to reduce the meshing load at the tip of the pole. Akira Kaikai
The device described in Japanese Patent Laid-Open No. 54-163425 is an example,
In this device, the engagement end which is the other end of the release rod is fitted with play into a recess formed in the pole so as to open to the outer peripheral side of the second axis, and the pole is ratcheted. When urging in the direction of meshing with, the lever is engaged with a large lever ratio to reduce the meshing load and the impact noise between the pole and ratchet is reduced, while the knob is pushed in to operate between the pole and ratchet. When releasing the mesh,
The release rod is engaged with the pole so that the lever ratio of the pole becomes small, and the amount of pushing operation of the knob necessary for releasing the meshing, that is, the releasing stroke is sufficiently secured, and the knob is slightly pushed in due to an error or the like. The engagement of the pole cannot be released only by playing.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described conventional parking brake operation device that engages the engaging end portion of the release rod with the recess of the pole, the release rod and the pole are not connected to each other, so that the vehicle is running. Vibration or shock when the pole crosses the ratchet during brake operation, the engaging end of the release rod rattles, making contact with the inner surface of the recess or the inner surface of the operating lever, resulting in abnormal noise. easy. Since the release rod, the pole and the operating lever are usually made of metal, such an abnormal noise is offensive to the ears and is not preferable. Further, while the release rod and the pole may be disengaged from each other due to the vibration or the like, the release rod and the pole are separately attached to the operation lever, and the engagement end portion of the release rod is resisted against the biasing force of the spring. Assembly work is not always easy because it is necessary to engage the pole. Further, since the engaging end portion of the pawl is formed in a limited space inside the operation lever, there is a limit to making the lever ratio different, and the degree of freedom in setting the lever ratio is small.

The present invention was made in the background of the above circumstances,
The purpose is to reduce the meshing load between the pole and ratchet while securing a sufficient amount of knob pushing operation when releasing the brake to reduce the impact sound when the pole crosses the ratchet and to release the release rod. It is an object of the present invention to provide a parking brake operating device in which annoying noises due to rattling are less likely to occur, the assembling work is easy, and the degree of freedom in setting the lever ratio is high.

Means for Solving the Problems The gist of the present invention for achieving the above-mentioned object is that (a) the operating lever, (b) the sector, and (c).
A pole, (d) knob, (e) release rod,
(F) In a parking brake operating device including a spring, (g) is attached to the operation lever so as to be rotatable about a third axis parallel to the first axis, and is rotated relative to the other end of the release rod. A contact member made of synthetic resin that is movably connected is provided, and the contact member is brought into contact with the pawl according to the urging force of the spring, and the pawl rotates in a direction in which the pawl meshes with the ratchet. The first contact portion for urging the pawl is provided so that (h) it is provided on any one of the release rod and the abutment member, and is attached to the pawl in accordance with the pushing operation of the knob. The second contact portion rotates the pawl in a direction in which the engagement with the ratchet is released by being brought into contact with the second contact portion.

By doing so, in the normal state in which the knob is not pushed against the biasing force of the spring, the biasing force of the spring causes the first contact portion of the contact member to contact the pole. , The pole meshes with the ratchet. At this time, the meshing load of the pawl with respect to the ratchet can be appropriately reduced by appropriately setting the abutting position and the abutting form of the first abutting portion and the pawl, so that the urging force of the spring can be reduced. In comparison, it is possible to sufficiently reduce the impact sound when the pole and ratchet are meshed with each other with a small meshing load and the pole moves while overcoming the ratchet. On the other hand, when the knob is pushed in to release the parking brake, the second contact portion provided on either the release rod or the contact member is brought into contact with the pole, and the pole becomes the ratchet. Is rotated in the direction in which the engagement between the second contact portion and the pole is released. In this case, the amount of pushing operation of the knob required to release the engagement between the pole and the ratchet is By appropriately setting the position, contact form, and the like, it is possible to arbitrarily set the position independently of the meshing load, and it is possible to secure a sufficient pushing operation amount that can prevent brake release due to error.

Here, since the other end of the release rod is connected to an abutment member rotatably provided on the operation lever so as to be rotatable about the third axis, the other end of the release rod can be relatively rotated. There is no rattling due to the impact of the pole when riding over the ratchet, and no abnormal noise is produced by contacting the inner surface of the operating lever. Since the contact member and the pole are merely in contact with each other according to the urging force of the spring, there is a risk that they will rattle due to the above-mentioned vibration or shock, resulting in abnormal noise. Since they are attached to each other, they will not be disengaged from each other and will not come into contact with the inner surface of the operating lever to make an abnormal noise.On the other hand, since the contact member is made of synthetic resin, it may cause contact with the pole. The abnormal noise generated as a result is relatively small, is not so disturbing to the ears, and the elasticity of the contact member absorbs vibrations and shocks well. Also, in order to reduce the meshing load, increasing the lever ratio, in this case the ratio of the amount of displacement of the pole tip to the amount of displacement of the release rod, causes the amount of displacement of the tip of the pole when the ratchet is crossed to be equivalent. Since the amount of displacement of the first contact portion of the contact member is small, the generation of abnormal noise is also suppressed in this respect.

On the other hand, in the present invention, since the contact member is provided between the pole and the release rod so that the lever ratio can be adjusted in two steps, when the release rod is directly engaged with the pole as in the conventional case. By comparison, it is possible to set the lever ratio in a wide range, and the degree of freedom in setting the lever ratio is large. Further, since the contact member is rotatably connected to the release rod, it may be attached to the operation lever in a state in which they are connected in advance, and the pole can be easily attached thereafter. Assembling work can be easily performed like a conventional general parking brake operating device in which and are connected.

As described above, according to the parking brake operating device of the present invention, the meshing load between the pole and the ratchet is reduced while ensuring a sufficient knob pushing operation amount when the brake is released, and the pole crosses the ratchet. The striking sound at the time is reduced. Moreover, since the lever ratio is adjusted in two stages, the degree of freedom in setting the lever ratio is high, and it is possible to further reduce the meshing load while ensuring a sufficient knob pushing operation amount.

Further, since the contact member is rotatably disposed on the operation lever, the release rod is connected to the contact member, and the contact member is brought into contact with the pole according to the biasing force of the spring, The rattling of the members is small and the members do not come out of engagement with each other, and since the abutting member is made of synthetic resin, the generation of annoying noise is greatly suppressed. Since the release rod and the contact member are connected so as to be rotatable relative to each other, the assembling work is relatively easy.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, a parking brake operating device 10 includes a sector 12 fixed to a floor of a vehicle body (not shown), an operating lever 14 rotatably supported by the sector 12 around a pin 20 as a first shaft, and the like. It is equipped with. The operation lever 14 is connected to the brake cable 16 at the base end portion 18, and a resin-made grip 22 is fitted to the tip end portion thereof, and the grip 22 is gripped to rotate clockwise in the drawing. Brake cable
An operating portion of a parking brake (not shown) connected via 16 is operated. FIG. 1 shows a state during the rotating operation.

A ratchet 24 is formed on the sector 12 along an arcuate shape centered on the pin 20, while a pole 26 meshing with the ratchet 24 is provided on the operation lever 14 with a second shaft parallel to the pin 20. Is attached so as to be rotatable around a pin 28. A knob 32 is provided at the tip of the grip 22 so as to be able to be pushed against the urging force of a spring 30 inserted therein, and the knob 32 has one end of a release rod 34. They are connected together. The other end of the release rod 34 is attached to the operating lever 14 so as to be rotatable about a pin 36 as a third shaft parallel to the pin 20.
38 are connected.

The contact member 38 is made of a synthetic resin material. As shown in detail in FIG. 2, the release rod 34 is rotatably connected by a pin 40 to a rod connecting portion 42 and the teeth of the pole 26. A first protrusion 48 which abuts on an end portion 46 on the tip 44 side to rotate the pawl 26 in a direction in which the pawl 26 meshes with the ratchet 24.
A second contacting end portion 50 on the side opposite to the tooth tip 44 with respect to the pin 28 to rotate the pole 26 in the opposite direction.
And a protrusion 52. And, in this contact member 38,
The biasing force of the spring 30 imparts a biasing force for rotating the pin 36 counterclockwise, whereby the first protrusion 48 is provided.
Is brought into contact with the pole 26, and
26 is biased into engagement with the ratchet 24. As described above, in this embodiment, the first protrusion 48 corresponds to the first contact portion of the contact member 38. Further, due to the above-described connection and contact relationship, the amount of protrusion of the knob 32 from the grip 22 is defined by the meshing of the pawl 26 and the ratchet 24. On the other hand, when the knob 32 is pushed in against the biasing force of the spring 30, the contact member 38
Is rotated to the right of the pin 36, and the second projection 52 abuts against and pushes against the pawl 26 so that the pawl 26 rotates in a direction in which the meshing with the ratchet 24 is released. Be moved. The second protrusion 52 corresponds to the second contact portion.

Further, the ratchet 24 that meshes with the pawl 26 has the above-mentioned biasing force when the operating lever 14 is rotated clockwise to the pin 20 in a state where they are biased so as to mesh with each other as described above. The pole 26 rotates in the direction of disengagement against
Although it is allowed to move over the ratchet 24 over the teeth of 24, when the operation lever 14 is about to be rotated counterclockwise, the engagement is maintained and the operation lever 14
The tooth profile is formed so as to prevent the rotation of the.

Further, a stopper 54 is provided inside the upper end portion of the base end portion 18 of the operation lever 14, and the stopper 54 comes into contact with the upper end surface 56 of the sector 12 to rotate the operation lever 14. An original position that is one end of the range on the non-braking side is defined.

In such a parking brake operating device 10,
When the operation lever 14 is rotated rightward from the original position to the braking position of the pin 20 to the braking position, the parking brake operating portion is operated. At this time, the pawl 26 is moved while moving over the teeth of the ratchet 24 against the urging force of the spring 30 due to the turning operation, and the ratchet 24 which is meshed at the time when the turning operation is stopped.
By maintaining the meshing of the teeth of the and the pole 26, the operating state of the parking brake operating portion is maintained. Further, the knob 32 is pushed against the biasing force of the spring 30 to release the meshing between the pole 26 and the ratchet 24, and in that state, the operation lever 14 is rotated counterclockwise to the original position. The operation of the parking brake operating portion is released by returning the parking brake operating portion. The urging force of the spring 30 at this time is a force against the pushing operation of the knob 32, and the pole 26 and the ratchet 24 that maintain the parking brake braking state by the careless pushing of the knob 32. The strength is set so that the knob 32 will not be easily pushed in even if it is lightly contacted, so that the engagement with is not released. Also, the above pole
26 and the ratchet 24, the strength required to maintain the operating state of the parking brake operating portion by engaging them as described above, or the strength required to rotate the operating lever 14 In order to have the strength to withstand the impact load when hitting each other,
Generally, a relatively tough metal is used as the material.

Here, in a state where the knob 32 is projected according to the biasing force of the spring 30, in other words, in a normal state in which the knob 32 is not pushed, the spring 30
Is transmitted to the contact member 38 via the knob 32 and the release rod 34, and as shown by the solid line in FIG.
The first protrusion 48 is brought into contact with the pole 26. The center of the pin 36 and the connecting point of the pin 40 are respectively O _3P and A, the turning radius at the connecting point A around the center O _3P is r ₁ , and the set load (biasing force) F _{0 of the} spring 30 is the rod connecting portion. when the tangential component relative to the center O _3-way at coupling point a when acting on the 42 and F _1, rotation moment M ₁ about the left pin 36 by the force F ₁ (center O _3-way), the following equation ( It is represented by 1). Then, the first protrusion 48 and the pole
When the contact point with 26 is B, and the radius of rotation of the contact point B with respect to the center O _3P is r ₂ , the tangent to the center O _3P of the first protrusion 48 at the contact point B with the rotation moment M _1. The directional force F ₂ is given by the following equation (2). In the formula (2), r ₁ / r ₂ is the connection point A in the contact member 38.
Is the reciprocal of the lever ratio of the abutting point B to the contact ratio, that is, the ratio r ₂ / r ₁ of the length r ₂ between O _{3P and} B to the length r ₁ between O _{3P and} A, and the force F ₂ increases as this lever ratio increases. Becomes smaller.

M ₁ = F ₁ · r ₁ (1) Next, in the abutment member 38, the force in the direction perpendicular to the surface of the end portion 46 exerted by the force F ₂ due to the balance of the forces acting on the abutment point B is F ₂ ′, the abutment point B and the pin 28. The angle formed by the line segment connecting the center O _2P and the surface of the end portion 46 is α (0 ° ≦ α <90 °), and the line segment connecting the contact point B and the center O _3P and the end portion 46. The angle formed by the surface of β is 0 (0 ° ≦ β <
90 °), and the turning radii with respect to the center O _2P of the contact point B and the meshing point C between the tooth tip 44 and the ratchet 24 are r ₃ ,
r ₄ , the counterclockwise turning moment M ₂ of the pin 28 received by the pole 26 and the meshing load F _{3 at the} meshing point C are as shown in the following equations (3) and (4), respectively. In the equation (4), r ₃ / r ₄ is the reciprocal of the lever ratio r ₄ / r ₃ of the meshing point C to the contact point B of the pole 26,
The force F ₃ decreases as the lever ratio increases.

As is clear from the equation (4), the turning radii r ₁ , r ₂ , r
The relationship between ₃ , r ₄ and the above angles α and β is, for example, r ₂ >.
By appropriately setting r ₁ , r ₄ > r ₃ , and α> β, the meshing load F of the pole 26 with respect to the ratchet 24
₃ can be arbitrarily reduced with respect to the set load F ₀ of the spring 30. Thereby, the operation lever
As 14 is rotated from the original position to the braking position,
When the pole 26 moves over the teeth of the ratchet 24, the impact sound generated when the tooth tips 44 collide with the tooth surfaces of the ratchet 24 one after another under the meshing load F ₃ is reduced. is there.

By the way, since the other end of the release rod 34 is rotatably connected to an abutting member 38 rotatably provided on the operation lever 14, the pawl 26 moves the ratchet when the vehicle 26 vibrates or operates the brake. There is no rattling due to an impact or the like when riding over 24, and no abnormal noise is generated by contacting the inner surface of the operating lever 14 or the like. Since the contact member 38 and the pole 26 are simply in contact with each other according to the urging force of the spring 30 transmitted through the release rod 34, they may rattle due to the above-mentioned vibration or shock, resulting in abnormal noise. However, both are disengaged from each other because they are rotatably attached to the operation lever 14.
While it does not make a strange noise by contacting the inner surface of
Since the abutting member 38 is made of synthetic resin, the first protrusion 48 of the abutting member 38 is flipped up by the momentum when the pole 26 crosses over the teeth of the ratchet 24, and the first protrusion 48 is intermittently poled. Even if the contact and the contact with the pole 26 are repeated, the abnormal noise caused by the contact with the pole 26 is relatively small, and the noise is not so harsh and the contact member
The elasticity of 38 absorbs vibrations and shocks well. Also, in order to reduce the meshing load F ₃ , the lever ratio r ₄ / r ₃
Is large, the displacement amount of the first protrusion 48 of the contact member 38 is small with respect to the displacement amount of the tooth tip 44 of the pole 26, and the generation of abnormal noise is suppressed also in this respect.

On the other hand, when the knob 32 is pushed against the urging force of the spring 30, the contact member 38 is rotated clockwise by the release rod 34, and the first protrusion is rotated.
When the 48 is rotated from the end portion 46 of the pawl 26 by an angle γ ₁ , the end of the pawl 26 in which the second protrusion 52 is still in the meshed state as shown by the alternate long and short dash line in FIG. Part 50
Abut. Then, when the contact member 38 further rotates from that position by the angle γ _2, the second projection 52 thereof rotates the pole 26 to the right of the pin 28 by the angle θ, and the second
As shown by the chain double-dashed line in the figure, the pole 26 is separated from the ratchet 24 to a position where the tooth tip 44 and the ratchet 24 do not interfere with each other even when the operation lever 14 is rotated, and the meshing therebetween is completely released. Let At this time, the rotation angle θ of the pole 26
Is the contact position where the second projection 52 contacts the end 50 of the pole 26, the angle of each line segment connecting the contact position and the centers O _3P and O _2P with respect to the surface, etc. It is possible to determine an arbitrary ratio with respect to the rotation angle γ ₂ by appropriately setting Also,
While the contact member 38 rotates by the angle γ _1, it is a so-called idle period, and the rotation angle θ can be adjusted by changing the setting of this period.

In this way, since the rotation angle θ of the pole 26 associated with the pushing operation of the knob 32 can be arbitrarily set, the displacement amount of the tooth tip 44 of the pole 26 with respect to the pushing amount of the knob 32 can be maintained at the same level as the conventional one. Therefore, unlike the case where the lever ratio is simply increased to reduce the meshing load, the meshing between the pole and the ratchet is not released by the slight pushing of the knob.

Further, in the parking brake operating device 10 of the present embodiment, since the contact member 38 is provided between the pole 26 and the release rod 34 and the lever ratio can be adjusted in two steps, the axis O _2P. It is possible to set the overall lever ratio in a wider range compared to the conventional device in which the other end of the release rod is engaged with play with a pole having a recess opened to the outer peripheral side of the lever ratio. There is a high degree of freedom in setting. In addition, since the contact member 38 is connected to the release rod 34 so as to be rotatable relative to each other, the contact member 38 may be attached to the operation lever 14 in a state in which they are connected in advance, and the subsequent attachment of the pole 26 is simple. Assembling work can be easily performed as in the conventional general parking brake operating device in which the release rod 34 and the pole 26 are connected.

Thus, the parking brake operating device 10 of the present embodiment
According to this, the meshing load F ₃ between the pole 26 and the ratchet 24 is ensured while ensuring a sufficient knob pushing operation amount when releasing the brake.
Is reduced, and the impact sound generated when the pole 26 moves while overcoming the teeth of the ratchet 24 is reduced. Moreover, since the lever ratio is adjusted in two steps, the degree of freedom in setting the lever ratio is high, and it is possible to further reduce the meshing load F ₃ while ensuring a sufficient knob pushing operation amount.
Further, the contact member 38 is rotatably arranged on the operation lever 14,
The release rod 34 is connected to the contact member 38, and the spring 30 is transmitted through the release rod 34.
Since the contact member 38 is brought into contact with the pole 26 in accordance with the urging force of, the contact members 38 are less rattle and the mutual engagement does not come off, and the contact member 38 is made of synthetic resin. Therefore, the generation of annoying noise is significantly suppressed. Since the release rod 34 and the contact member 38 are connected so as to be rotatable relative to each other, the assembling work is relatively easy.

Although one embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be applied to other aspects.

For example, in the above-described embodiment, the rotation angle γ ₁ of the contact member 38 at the rod connection point A does not necessarily have to be provided, but instead, the rod of the contact member 38 connected via the pin 40. An idle stroke that allows relative movement between the connecting portion 42 and the release rod 34 may be provided.

Further, the spring 30 in the above-described embodiment is inserted in a state of directly urging the knob 32 at the tip portion of the operation lever 14, but the release rod 34 and the contact member 38 are directly connected. It may be inserted in a biased state.

Further, in the above-described embodiment, the second projection 52 is provided on the contact member 38 in order to release the meshing between the pawl 26 and the ratchet 24, but instead of the second projection 52, A projection extending from one end of the release rod 34 on the side of the connecting point A may abut the end 50 of the pawl 26 to release the mesh.

Although not illustrated one by one, the present invention can be implemented in various modified and improved modes based on the knowledge of those skilled in the art without departing from the spirit thereof.

[Brief description of drawings]

FIG. 1 is a front view showing a parking brake operating device according to an embodiment of the present invention with a part cut away.
FIG. 2 is a diagram for explaining the operation of the main part of the apparatus shown in FIG. 10: Parking brake operating device 12: Sector 14: Operating lever, 20: Pin (first axis) 24: Ratchet, 26: Pole 28: Pin (second axis), 30: Spring 32: Knob, 34: Release rod 36 : Pin (third axis), 38: Contact member 48: First protrusion (first contact portion), 52: Second protrusion (second contact portion)

Claims (1)

[Scope of utility model registration request] 1. An operating lever connected to a parking brake actuating portion via a brake cable, the operating lever being rotatably supported about a first axis, and along an arc shape centered on the first axis. With a ratchet formed therein, a pole attached to the operation lever so as to be rotatable about a second axis parallel to the first axis, and meshed with the ratchet, and the pole can be pushed into the tip of the operation lever. A knob provided, and a release rod that is connected to the knob at one end and that rotates the pole around the second axis by pushing the knob to release the meshing with the ratchet. A parking brake equipped with a spring that normally causes the knob to protrude from the tip of the operating lever and biases the pawl to engage with the ratchet. In the operating device, a contact made of synthetic resin, which is attached to the operation lever so as to be rotatable about a third axis parallel to the first axis, and the release rod is relatively rotatably connected to the other end. A member is provided, and the corresponding contact member is brought into contact with the pawl according to the urging force of the spring, and a first abutment for urging the pawl so as to rotate in a direction in which the pawl meshes with the ratchet. A portion is provided, and the pawl is engaged with the ratchet by being provided on either the release rod or the abutment member and abutting against the pawl in accordance with the pushing operation of the knob. A parking brake operating device having a second contact portion that rotates in a direction in which the parking brake is released.