JP2004176788A - Braking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a braking device allowing the easy change of the fixed angle of a bracket in the assembling of a brake and also the commonization of parts. <P>SOLUTION: This braking device 1 comprises a brake drum 3 rotated together with a wheel 21 connected to an axle 20, a brake shoe 4 coming into contact with the inner peripheral surface of the brake drum 3 to generate a braking force, a back plate 5 movably supporting the brake shoe 4 toward the inner peripheral surface of the brake drum 3, and the bracket 6 receiving a braking reaction acting on the back plate 5 in the operation of the brake. The device is characterized in that the bracket 6 is co-tightened to the axle 20 to the back plate 5. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a brake device, and more particularly, to a brake device used for a vehicle, an industrial machine, or the like.
[0002]
[Prior art]
2. Description of the Related Art As a brake device used in a vehicle, an industrial machine, or the like, for example, a drum brake device disclosed in Patent Document 1 is known.
[0003]
With reference to Patent Document 1, this type of drum brake device will be described. A brake drum that rotates together with wheels, a brake shoe that contacts the inner peripheral surface of the brake drum and regulates rotation of the wheels, and a brake shoe An operation cam for pressing against the inner peripheral surface of the brake drum, an operation lever for rotating the operation cam to extend the brake shoe, a back plate for supporting the brake shoe and the operation cam, etc. inside the brake drum, and a brake shoe. And a bracket having an arm that receives a braking reaction force acting on the back plate at the time of contact with the brake drum and serves as a fixed portion to a non-rotating portion of the vehicle.
[0004]
[Patent Document 1]
Japanese Utility Model Publication No. 60-137689
[Problems to be solved by the invention]
By the way, in the design of the brake device, in order to avoid interference between a frame (a non-rotating part of the vehicle) and a component exposed to the outside of the brake drum, such as an operation lever and an operation wire for swinging the operation lever, It is necessary to change the fixing angle of the bracket, the shape of the bracket, etc. each time according to the shape.
[0006]
In recent years, common use of various components has been promoted due to reduction in production costs and problems in component management. However, in the above-described brake device, there is no flexibility in the fixing angle of the bracket with respect to the frame, and in order to correspond to a vehicle body having a different frame shape, it is necessary to rebuild a back plate and a bracket according to each vehicle type. In other words, there are still many points to be improved in view of production costs and costs related to parts management.
[0007]
The present invention has been made in view of such technical background, and an object of the present invention is to provide a brake device that can easily change a fixed angle at the time of assembling and can also use common components.
[0008]
[Means for Solving the Problems]
In order to solve the above technical problem, the present invention has the following configuration.
That is, the present invention provides a rotating body that rotates about an axis, a braking member that contacts the rotating body and regulates the rotation of the rotating body, and a support that supports the braking member movably toward the rotating body. A brake device comprising: a member, and a bracket that receives a braking reaction force acting on the support member when the rotating body contacts the braking member,
The bracket is fastened to the shaft together with the support member.
[0009]
In the brake device configured as described above, the bracket is fastened together with the support member to the shaft. That is, since the support member and the bracket are fixed to each other on the shaft, by changing the fixing angle on this shaft, for example, the fixing angle of the support member when assembling to the vehicle body can be easily changed. In addition, since it is not necessary to rebuild the support member and the bracket when the fixed angle is changed, the components can be shared.
[0010]
Further, the support member and the bracket may be provided with an engagement portion that engages with each other and regulates a relative displacement of the support member and the bracket.
[0011]
In this configuration, when the support member and the bracket are fixed, the engagement portions provided on the support member and the bracket are engaged with each other, thereby facilitating the positioning of the both. In addition to the fixing on the shaft, the support member and the bracket are also engaged and fixed by the mutually engageable engaging portion, so that the supporting member and the bracket are provided at a plurality of positions on the shaft and the engaging portion. The bracket is fixed. Therefore, the relative displacement between the two is more reliably regulated.
[0012]
Further, the support member and the bracket are provided with irregularities that can be engaged with each other as the engagement portion,
The projections and depressions serving as the engagement portions may be provided in accordance with an arrangement in which a fixing angle of the bracket with respect to the support member can be selected from at least a first fixing angle and a second fixing angle.
[0013]
In this configuration, the engaging portion capable of engaging the concave and convex is provided on the support member and the bracket. In addition, the engaging portion is provided in accordance with an arrangement that can be selected at least between a first fixed angle and a second fixed angle when positioning the bracket with respect to the support member. Therefore, in positioning the bracket with respect to the support member, the bracket can be positioned with respect to the support member at at least two or more fixed angles.
[0014]
An operating lever that moves from the first position to the second position to exert a braking force between the braking member and the rotating body;
A spring for urging the operating lever from the second position toward the first position;
A guide for restricting in a predetermined direction the deflection of the spring that occurs with movement of the operating lever to the second position;
May be further provided.
[0015]
In this configuration, there is provided an operating lever that exerts a braking force between the braking member and the rotating body by moving from the first position to the second position. A spring is provided between the first position and the second position to return the operation lever to the original position. Further, a guide is provided for restricting in a predetermined direction the bending of the spring caused by the movement of the operating lever to the second position. In other words, since the guide is provided to regulate the deflection of the spring in a predetermined direction, interference of the spring with, for example, a wheel rotating with the rotating body is avoided.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, an example in which the brake device of the present invention is applied to a wheelchair will be described.
[0017]
A brake device 1 according to the present embodiment includes a brake drum 3 that rotates together with wheels 21 connected to an axle 20 and a brake shoe 4 (a pair of main shoes) that generates a braking force by contacting the inner peripheral surface of the brake drum 3. 4a, 4a and a lock shoe 4b), a back plate 5 for movably supporting the brake shoe 4 toward the inner peripheral surface of the brake drum 3, and a wheelchair for applying a braking reaction force acting on the back plate 5 when the brake is operated. A bracket 6 is received at a position offset from the axle 20 by using a frame 91 of the 90, and an operation lever 92 for adjusting the degree of braking and the like is provided.
[0018]
The brake drum 3 is fixed to a hub 20a attached to the axle 20 via a bearing 3d or a spoke 20b extending radially from the hub 20a (see FIG. 2).
[0019]
More specifically, a circular base 3a fixed to the hub 20a or the spoke 20b, and a peripheral wall 3b extending from a peripheral edge of the base 3a toward the frame 91 of the wheelchair 90 when assembled to the wheelchair 90; The inner peripheral surface 3c of the peripheral wall 3b serves as a contact surface with the brake shoe 4.
[0020]
The back plate 5 is made of a metal plate or the like having a sufficient mechanical strength. As shown in FIGS. 3 to 5, a circular substrate portion 5 a substantially equal to the diameter of the brake drum 3 is formed. And an extension portion 5b extending outside the brake drum 3.
[0021]
An axle insertion hole 5f into which the axle 20 is inserted when the back plate 5 is assembled to the wheelchair 90 is provided at the center of the board portion 5a. The back plate 5 is fastened together with the bracket 6 to be described later to the axle 20 with the axle 20 inserted through the axle through hole 5f. In addition, B in FIG. 5 is a nut used for joint fastening.
[0022]
Further, substantially all of the main components constituting the brake device 1 are collectively provided on the board portion 5a.
The main components of the brake device 1 include a pair of main shoes 4a that contact the inner peripheral surface 3c of the brake drum 3 to exert a braking force in the normal rotation direction and the reverse rotation direction of the brake drum 3. A lock shoe 4b that comes into contact with the inner peripheral surface 3c of the brake drum 3 and restricts rotation in the reverse direction of the brake drum; and the main shoe 4a and the lock shoe 4b rotate about a point different from the rotation center of the brake drum 3 as a fulcrum. An anchor pin 12 that freely supports, a return spring 13 that holds each main shoe 4a at a position separated from the inner peripheral surface 3c of the brake drum 3, and a lock shoe 4b that is separated from the inner peripheral surface 3c of the brake drum 3. The lock shoe return spring 7 is held in the closed position, and the main shoe is opposed to the tension of the return springs 13 and 7. The operation cam 8 for moving the lock shoes 4a and the lock shoe 4b to the position where the braking force is exerted individually, and the operation lever 8a for transmitting the operation (movement) of the operation lever 92 to the operation cam 8 via the back plate 5 are exemplified. it can.
[0023]
On the other hand, a fixing portion 5e of the operation wire 92a connected to the operation lever 92 is formed in the extension portion 5b, and one end of the operation wire 92a is fixed to the extension portion 5b via the fixing portion 5e. . The wire main body 92c inside the operation wire 92a passes through the inside of an operation lever return spring 92b composed of, for example, a helical spring, and is connected to the operation lever 8a.
[0024]
When operating the operation lever 92, the operation lever 8a moves from the initial position, that is, the first position, to the fixed portion 5e side (the second position side). The movement of the operation lever 8a is converted into rotation of the operation cam 8 connected to the operation lever 8a. The rotation of the operation cam 8 is transmitted to the brake shoe 4 (main shoe 4a), and the brake shoe 4 is expanded inside the brake drum 3 to exert a braking force.
When the operating lever 92 is not operated, the operating lever 8a is returned to the initial position by the tension of the operating lever return spring 92b, and the brake is released.
[0025]
9 and 10, a guide 5g extending toward the wheel 21 side of the operating lever return spring 92b is formed integrally with the fixing portion 5e, as shown in FIGS. The guide 5g regulates the bending of the operating lever return spring 92b that occurs with the movement of the operating lever 8a toward the fixed portion 5e.
[0026]
Next, the bracket 6 will be described.
As shown in FIGS. 4 and 5, the bracket 6 includes a frame engaging portion 6a bent toward the frame 91 and a connecting plate 6b extending toward the axle 20 from the base of the frame engaging portion 6a. And the like.
[0027]
As shown in FIG. 8, the frame engaging portion 6a is provided with a notch that can be engaged with the frame 91. When the frame engaging portion 6a is assembled to the vehicle body, the frame engaging portion 6a is engaged with the frame 91. Then, the connecting plate 6b is fastened together with the back plate 5 to the axle 20. That is, the bracket 6 is fixed to the vehicle body with the axle 20 serving as the rotation center of the brake drum 3 and the frame 91 serving as fulcrums in total.
[0028]
Further, the bracket 6 and the back plate 5 are provided with an engagement portion 30 that can engage with the concave and convex portions at a position separated from the axle 20. The engaging portion 30 facilitates the positioning of the bracket 6 with respect to the back plate 5, and the relative positional shift between the back plate 5 and the bracket 6 due to the uneven engagement between the axle 20 and the engaging portion 30. Is more reliably regulated.
[0029]
In the present embodiment, when the engaging portion 30 is provided on the back plate 5 and the bracket 6, as shown in FIGS. 4 and 6, the fixing angle of the bracket 6 with respect to the back plate 5 is set to at least two or more. The engagement portions 30 are provided at a plurality of locations in an arrangement that can be engaged at an angle.
[0030]
4 and FIG. 6, when comparing the arrangement of the engaging portions 30, FIG. 4 shows that when the bracket 6 is engaged with the back plate 5, the anchor pin 12 on the back plate 5 The engaging portion 30 is formed at a position where an angle between the bracket 6 and the frame 91 to be engaged is θ1 (first fixed angle). Referring to FIG. 6, the engagement portion 30 is located at a position where the angle between the anchor pin 12 on the back plate 5 and the frame 91 with which the bracket 6 is engaged is θ2 (a second fixed angle). Is formed.
[0031]
That is, in the present embodiment, after the bracket 6 is positioned with respect to the back plate 5 using the engagement portion 30, the back plate 5 and the bracket 6 are jointly fastened to the axle 20 in this state. The angle between the vehicle body and the back plate 5 when assembled to the vehicle body can be changed as appropriate.
[0032]
As described above, in the brake device 1 according to the present embodiment, the back plate 5 and the bracket 6 are separately provided, and the bracket 6 is provided with the connecting plate 6 b extending toward the axle 20. When the bracket 5 is fixed, the back plate 5 and the bracket 6 are fastened together to the axle 20 with the connection plate 6b of the bracket 6 interposed therebetween.
[0033]
That is, since the back plate 5 and the bracket 6 are fixed to each other on the axle 20 which is the center of rotation of the brake drum 3, by changing the fixing angle on the axle 20, the back plate 5 with respect to the frame 91 is changed. The fixed angle can be easily changed.
[0034]
Further, it is not necessary to change the shapes of the back plate 5 and the bracket 6 in accordance with the change of the fixed angle of the back plate 5, and in this respect, the parts are shared among the vehicle types.
[0035]
In addition, the above-described embodiment is merely an example, and details thereof can be appropriately changed according to the specifications of the brake device 1.
[0036]
For example, in the above embodiment, when assembling the back plate 5, the engaging portion 30 is formed so as to enable the assembling of the back plate 5 at two fixed angles, but a convex portion is provided on the bracket 6 side, If a plurality of recesses are formed over the entire circumference of the axle insertion hole 5f of the back plate 5, the fixed angle of the back plate 5 can be changed in all directions.
[0037]
In the above embodiment, a part of the fixing portion 5e extends along the side surface of the operating lever return spring in order to restrict the bending of the operating lever return spring 92b. However, as shown in FIG. The prepared guide plate P may be fixed between the wheel 21 and the operation lever return spring 92b via the fixing portion 5e to have a function as the guide 5g.
[0038]
In the above-described embodiment, the drum brake device has been described as an example. However, the back plate fixing technique according to the present invention can be applied to a disc brake and the like. In this case, the disk rotor is used as a rotating body, and a support serving as a caliper support member is fastened to a shaft (spindle) that supports the center of rotation of the disk rotor. Then, a configuration in which a caliper is fixed to a support fastened to the shaft is considered.
[0039]
Further, in the above-described embodiment, the brake device 1 for the wheelchair 90 has been described as an example. Also applicable to
[0040]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a brake device in which the fixing angle of the bracket can be easily changed at the time of assembling the brake and the components can be shared.
[Brief description of the drawings]
FIG. 1 is a side view of a wheelchair equipped with a brake device according to the present embodiment.
FIG. 2 is a perspective view showing a state in which a brake drum is fixed to wheels.
FIG. 3 is a schematic configuration diagram showing an internal structure of the brake device.
FIG. 4 is a rear view of the brake device viewed from behind a back plate in a state where the brake device is assembled to a vehicle body.
FIG. 5 is a sectional view taken along line AA of FIG. 4;
FIG. 6 is a rear view of the brake device viewed from behind a back plate in a state where the brake device is assembled to a vehicle body.
FIG. 7 is a sectional view taken along the line AA of FIG. 6;
FIG. 8 is a view showing an engagement state of the bracket with a frame engagement portion and a back plate.
FIG. 9 is a view showing the bending of an operation lever return spring.
FIG. 10 is a diagram showing a state in which the bending of the operating lever return spring is regulated by a guide.
FIG. 11 is a diagram showing a state where a guide plate is installed instead of a guide.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Brake device 3 Brake drum 3a Brake drum base 3b Brake drum peripheral wall 3c Brake drum inner peripheral surface 3d Bearing 4 Brake shoe 4a Main shoe 4b Lock shoe 5 Back plate 5a Back plate substrate portion 5b Back plate extension 5e Fixing part 5f Axle penetration hole 5g Guide 6 Bracket 6a Frame engaging part 6b Connecting plate 7 Lock shoe return spring 8 Operating cam 8a Operating lever 12 Anchor pin 13 Return spring 20 Axle 20a Hub 20b Spoke 21 Wheel 30 Engaging part 90 Wheelchair 91 Frame 92 Operation lever 92a Operation wire 92b Operation lever return spring 92c Wire body P Guide plate B Nut

Claims (4)

A rotating body that rotates about an axis, a braking member that contacts the rotating body and regulates rotation of the rotating body, a support member that supports the braking member movably toward the rotating body, and the rotating body. And a bracket that receives a braking reaction force acting on the support member at the time of contact with the braking member, and a brake device,
The brake device, wherein the bracket is fastened together with the support member to the shaft. 2. The brake according to claim 1, wherein the support member and the bracket are provided with an engagement portion that engages with each other and regulates a relative displacement of the support member and the bracket. 3. apparatus. The support member and the bracket are provided with irregularities that can be engaged with each other as the engagement portion,
3. The unevenness as the engaging portion is provided according to an arrangement in which a fixing angle of the bracket with respect to the support member can be selected at least from a first fixing angle and a second fixing angle. The brake device according to item 1. An operating lever that moves from the first position to the second position and exerts a braking force between the braking member and the rotating body;
A spring for urging the operating lever from the second position toward the first position;
A guide for restricting in a predetermined direction the deflection of the spring that occurs with movement of the operating lever to the second position;
The brake device according to any one of claims 1 to 3, further comprising:

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