JP2004169760A - Braking member and its friction member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing technique of a friction member by which the friction member can be fixed with sufficient fixing strength even in a braking device with a structure in which the width of the fixing face of the friction member is narrow and the fixing strength of the friction member can be hardly secured. <P>SOLUTION: The braking member 6 is provided with the friction member 60 to regulate rotations of a wheel by coming into contact with a rotor to rotate together with the wheel and a holding member 65 to which the friction member 60 is fixed. The friction member 60 is characterized in that it is fixed to the holding member 65 at least on the side face 65a side of the holding member 65. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a braking member and a method of fixing a friction member thereof, and more particularly, to a brake shoe used in a brake device such as a drum brake device and a method of fixing a lining thereof.
[0002]
[Prior art]
2. Description of the Related Art As a drum brake device used in a vehicle or an industrial machine, a drum brake device disclosed in Patent Literature 1 is known.
[0003]
This type of drum brake device disclosed in Patent Document 1 includes, for example, a brake drum fixed to wheels or the like and rotating with the wheels, and a lining that contacts the inner peripheral surface of the brake drum and restricts rotation of the brake drum that is a rotating body. And a shoe body including a shoe body to which the lining is fixed.
[0004]
The shoe body includes an arch-shaped web substantially equal to the radius of curvature of the brake drum, and a rim supported on the back side of the web and having a lining fixing surface formed on the front side. The lining is firmly fixed to the rim of the shoe body via a plurality of rivets.
Then, the friction surface of the lining is pressed against the inner peripheral surface of the brake drum by, for example, expanding the brake shoe in the radial direction of the brake drum with an operation cam or the like, thereby generating a braking force.
[0005]
[Patent Document 1] Japanese Patent Application Laid-Open No. 06-050363
[0006]
[Problems to be solved by the invention]
By the way, in a light vehicle such as a wheelchair, the installation space for the brake shoe is small, and the area of the lining fixing surface is naturally reduced. For this reason, for example, a phenomenon occurs in which it is difficult to fix the lining using rivets, and a friction surface is greatly reduced by riveting.
[0007]
Further, the above points can be avoided by bonding and fixing the lining to the lining fixing surface. However, in a small-sized brake device having a small area of the lining fixing surface, it is difficult to secure an adhesion area, and a large shear force acts between the lining and the lining fixing surface as compared with a normal brake device. For this reason, in order to secure the adhesive strength, it is necessary to separately perform processing such as unevenness on the lining fixing surface. In other words, fixing by bonding is not always an effective solution in view of manufacturing costs and the like.
[0008]
The present invention has been made in consideration of the above technical background, and has a sufficient fixing strength even in a brake shoe having a structure in which the area of the lining fixing surface is small and it is difficult to sufficiently secure the lining fixing strength. It is an object to provide a lining fixing technique capable of fixing a lining.
[0009]
[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 braking member having a friction member that regulates rotation of the rotating body by contacting a friction surface of the surface with a rotating body that rotates with the wheel, and a holding member to which the friction member is fixed. So,
The friction member is fixed to the holding member at least at a position different from the back side thereof.
[0010]
In the braking member configured as described above, the friction member is fixed to the holding member at a position different from the back surface side of the friction member that is the original fixing place. For this reason, the fixing area of the friction member in the holding member can be sufficiently ensured, and the fixing strength of the friction member to the holding member can be increased. In the above, "at least" means that the friction member is fixed at a position different from the rear surface side of the friction member, and further, it is also possible to fix the friction member at the rear surface side which is the original fixing place. .
[0011]
Further, the friction member includes a substrate portion forming the friction surface, and a side plate portion extending from the substrate portion and extending along a side surface of the holding member,
The friction member may be fixed to a side surface of the holding member via the side plate.
[0012]
In this configuration, the friction member is extended to the side surface of the holding member, and the friction member is fixed to the holding member on the side surface of the holding member. That is, the fixing surface of the friction member is secured by using the side surface of the holding member that is not affected by the width of the holding member (the width of the friction member mounting surface).
[0013]
Further, the holding member may be provided with a restricting portion that is in contact with an end surface of the friction member positioned in the rotation direction of the rotator to restrict the movement of the friction member in the rotation direction of the rotator. Good.
[0014]
In this configuration, since the holding member is provided with the restricting portion that comes into contact with the end surface of the friction member positioned in the rotation direction of the rotating body, the movement of the friction member that is dragged by the rotation of the rotating body and moves in the rotation direction is restricted. it can. Further, for example, when the friction member is fixed to the side surface of the holding member, the shearing force acting on the fixing portion can be reduced by the restricting portion.
[0015]
The friction member may be formed of an aluminum-based metal material.
In other words, excessive wear of the rotating body can be achieved by using an aluminum-based metal material that has higher mechanical strength than hard rubber, sintered metal, and non-asbestos, and is softer than iron, cast iron, and sintered metal. And the mechanical strength of the friction member is increased.
[0016]
In order to solve the above technical problems, the present invention employs the following method.
That is, a friction member for fixing a friction member in a braking member having a friction member that restricts rotation of the rotation member by contacting a friction surface of the surface with a rotation member that rotates with the wheel, and a holding member to which the friction member is fixed. The method,
The friction member is fixed to the holding member at least at a position different from the rear surface side.
[0017]
In this method, the friction member is fixed to the holding member at a position different from the back side of the friction member, which is the original fixing place. Therefore, a sufficient fixing area between the holding member and the friction member can be ensured, and the fixing strength of the friction member to the holding member can be increased. Note that “at least” above means that the holding member is fixed at a position different from the back surface side of the friction member, and that it is also possible to fix the back surface side of the friction member as the original fixing place. .
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
In this embodiment, an example in which the braking device of the present invention is applied to a braking device used in a wheelchair will be described.
[0019]
The brake device 1 to which the braking member according to the present invention is applied is a brake device of a type generally referred to as an “inwardly expanding drum brake”, and includes a brake drum (rotator) 3 that rotates together with the wheels 101, and a brake drum. A main shoe (braking member) 4 and a lock shoe (braking member) 6 for generating a braking force by contacting an inner peripheral surface of the main shoe 3; and a back plate 5 for supporting the main shoe 4 and the lock shoe 6 in the brake drum 3. (Support member) and the like.
[0020]
The brake drum 3 is fixed to a hub 102 serving as a rotation center of the wheel 101 or a spoke 103 radially extended from the hub 102 (see FIG. 2).
More specifically, a circular base 3a fixed to the hub 102 or the spoke 103 and a peripheral wall 3b extending toward the frame side of the wheelchair 100 from the periphery of the base 3a when mounted on the wheelchair 100. The inner periphery of the peripheral wall 3b serves as a contact surface between the main shoe 4 and the lock shoe 6.
[0021]
The back plate 5 is made of a steel plate or the like having a sufficient strength, and is mounted between the frame of the wheelchair 100 and the wheels 101.
More specifically, an axle insertion hole 5b is formed in the center of the back plate 5, and the back plate 5 is fixed to a frame of the wheelchair 100 in a state where the axle (rotation axis) is inserted through the axle insertion hole 5b. .
On the back plate 5 and inside the brake drum 3, substantially all of the main components constituting the brake device 1 are collectively provided.
[0022]
The main components of the brake device 1 provided on the back plate 5 include a pair of main shoes 4 which come into contact with the inner peripheral surface 3c of the brake drum 3 and exhibit a braking force in the forward rotation direction and the reverse rotation direction of the brake drum 3. , 4, a return spring 13 for holding each main shoe 4, 4 at a position separated from the inner peripheral surface 3 c of the brake drum 3, and a contact with the inner peripheral surface 3 c of the brake drum 3 to cause the brake drum to rotate in the reverse direction. A lock shoe 6 for regulating the rotation, a lock shoe return spring 7 for holding the lock shoe 6 at a position separated from the inner peripheral surface 3c of the brake drum 3, and a main shoe 4 against the tension of the return springs 13 and 7. And an operation cam 8 for moving the lock shoes 6 to positions where individual braking forces are exhibited.
[0023]
The pair of main shoes 4, 4 has a contact point 4 a with the operation cam 8 at one end and a connecting hole 4 b for receiving an anchor pin 12 which is a rotation center of the main shoe 4 at the other end. ), And a lining (friction member) 11 which is a contact surface between the main shoe body 10 and the inner peripheral surface 3c of the brake drum and is fixed to the main shoe body 10 side. . Further, each of the main shoes 4, 4 is rotatably attached to an anchor pin 12 provided on the lower side of the back plate 5 through the connection hole 4b.
[0024]
That is, the main shoes 4, 4 are connected to each other via the anchor pin 12, and the rotation of the operating cam 8 causes the contact portion 4a to be the point of force, and the anchor pin 12 to be the fulcrum. Pressed to exhibit braking force.
[0025]
The main shoes 4, 4 are connected to each other by a return spring 13, and are normally held at a position separated from the inner peripheral surface 3c of the brake drum. Here, the normal state is a state in which an external force due to the rotation of the operation cam 8 does not act on the main shoe 4. The operation of the main shoe 4 will be described later in detail.
[0026]
The lock shoe 6 includes a lock lining (friction member) 60 made of an aluminum alloy that contacts the inner peripheral surface 3 c of the brake drum 3 to restrict the rotation of the brake drum 3, and a lock shoe body 65 to which the lock lining 60 is fixed. (Holding member).
[0027]
First, the lock shoe main body 65 is formed of an arcuate flat plate whose entire length is formed sufficiently longer than the shortest distance between the anchor pin 12 and the brake drum 3. The lock lining 60 is fixed to one end and the other end is fixed to the other end. The lock shoe return spring 7 is connected.
[0028]
Further, between the one end where the lock lining 60 is provided and the other end connected to the lock shoe return spring 7 and near the other end connected to the lock shoe return spring 7, a connection portion with the anchor pin 12 is formed. A connection hole 6a is provided. The lock shoe body 65 is rotatably attached to the anchor pin 12 via the connection hole 6a.
[0029]
A contact point 6b with the operation cam 8 is provided near the end of the lock shoe body 65 to which the lock lining 60 is fixed, and the lock shoe body 65 rotates in accordance with the angle of the operation cam 8. Each time, the distance between the brake drum inner peripheral surface 3c and the lock lining 60 changes.
[0030]
The lock shoe 6 is attached to the anchor pin 12 in a state where the lock shoe 6 is offset in the normal rotation direction from a line L extending from the brake drum 3 to the anchor pin 12. Therefore, a self-energizing effect (wedge effect) is generated between the lock shoe 6 and the brake drum 3 when the brake drum 3 rotates in the reverse direction and when the lock shoe 6 contacts the brake drum 3. Therefore, the rotation of the brake drum 3 in the reverse rotation direction is forcibly restricted by the self-energizing effect. Thus, the lock shoe 6 restricts the reverse rotation of the brake drum 3.
[0031]
The lock shoe 6 is normally held at a position separated from the inner peripheral surface 3 c of the brake drum 3 by the tension of the lock shoe return spring 7. Therefore, in a normal state (a state in which the lock shoe 6 is not in contact with the inner peripheral surface 3c of the brake drum 3), the occurrence of the self-energizing effect is prevented.
[0032]
The operating cam 8 includes an operating cam portion 8a for the main shoe 4 which is in contact with the main shoe body 10 at a contact point 4a, and a lock shoe 6 further extended in the radial direction of the operating cam portion 8a for the main shoe 4. Operating cam portion 8b.
Each of the operation cam portions 8a and 8b is connected to an operation lever 15 provided behind the back plate 5, and the operation cam portion 8a and the operation cam portion 8b are integrally formed following the swing of the operation lever 15. To rotate.
[0033]
On the other hand, the end of the operation lever 15 is connected to a brake lever 110 provided on the frame 104 of the wheelchair 100 via a wire 111. When the brake lever 110 is operated, the operation lever is operated in conjunction with the operation of the brake lever 110. 15 swings. That is, the operation lever 15 swings by the operation of the brake lever 110, and this operation is transmitted to the operation cam portions 8a and 8b, and the operation cam portions 8a and 8b rotate.
[0034]
The brake lever 110 is provided on a base plate 112 fixed to the frame 104 of the wheelchair 100, a brake lever support bracket 113 extending downward from the base plate 112, and a brake lever support bracket 113 as shown in FIG. And a lever main body 115 rotatably provided on the brake lever support pin 114.
[0035]
The mounting position of the brake lever 110 with respect to the frame 104 is arbitrary, but is preferably provided on the handrail portion 116 of the wheelchair 100 that is easy for the user to operate, as shown in FIG.
[0036]
As shown in FIG. 4, a mode switching groove 112a serving as a guide for the lever main body 115 is formed in the base plate 112, and the lever main body 115 is inserted through the mode switching groove 112a via the brake lever support pin 114. At the brake lever support bracket 113.
[0037]
The mode switching groove 112a is, as shown in FIG. 4, a main brake mode in which the brake can be arbitrarily applied in both the forward and backward directions of the wheelchair 100, and the brake is not applied in any of the forward and backward directions. The mode is divided into a brake release mode and an auxiliary brake mode in which a brake is automatically applied when the wheelchair 100 moves backward.
[0038]
The brake lever support bracket 113 has a cut-and-raised portion 113a formed so as to face the inside of the mode switching groove 112a, and the cut-and-raised portion 113a restricts the movement of the lever body 115.
[0039]
As will be described in detail later, in the main brake mode, the braking force can be changed by sliding the lever body 115 in the section indicated by the arrow A in FIG. In the brake release mode, all the brakes are released by locking the lever body 115 at the point B in FIG. In the auxiliary brake mode, the lever body 115 is locked at the point C in FIG. 4 to generate a braking force when the brake drum rotates in the reverse direction. That is, the operation of the brake can be arbitrarily switched by switching the lever body 115 to each mode.
[0040]
An operating lever return spring 15b is provided at an end of the operating lever 15 connected to the lever main body 115 via a wire 111.
The operation lever return spring 15b is provided between the return spring support arm 5a extending from the back plate 5 and the operation lever 15, and urges the operation lever 15 in a direction to always keep away from the return spring support arm 5a. are doing. Therefore, in the main brake mode, the lever body 115 is biased toward the brake release mode.
[0041]
Subsequently, the operation of each component described above will be described with reference to FIGS. FIG. 5 shows the operation state of the main brake mode. FIG. 6 illustrates the operation state of the brake lever 110 in the main brake mode. FIG. 7 shows an operation state of the brake release mode. FIG. 8 illustrates an operation state of the brake lever 110 in the brake release mode. FIG. 9 shows an operation state of the auxiliary brake mode. FIG. 10 illustrates the operation state of the brake lever 110 in the auxiliary brake mode.
[0042]
<Main brake mode>
The main brake mode is a mode in which the user can arbitrarily apply a brake in both directions when the wheelchair 100 moves forward and backwards. The braking force is generated by the main shoe 4 described above.
[0043]
More specifically, when the lever body 115 is pressed in the direction of arrow A in FIG. 6, the brake is applied, and when the lever body 115 is returned, the lever body 115 is pulled back in the direction of arrow A ′ in FIG. 6 by the tension of the operating lever return spring 15 b, and the brake is released. It is released.
[0044]
The operation of each component is as follows.
First, when the lever body 115 is pressed in the direction of arrow A in FIG. 6 to apply the brake, the operation cam portion 8a rotates in the direction of arrow N in FIG. 5, and the main shoes 4, 4 spread outward, and the lining 11 Is pressed against the inner peripheral surface 3c of the brake drum 3 to apply a brake. On the other hand, when the lever body 115 is returned, the operation cam 8 returns in the direction of arrow R in FIG. 5, and the main shoes 4, 4 are separated from the brake drum inner peripheral surface 3 c by the tension of the return spring 13. Therefore, the brake is released.
[0045]
In the main brake mode, since the operation cam portion 8b for the lock shoe 6 rotates in the direction of arrow Y in FIG. 5, the lock shoe 6 is moved from the inner peripheral surface 3c of the brake drum by the tension of the lock shoe return spring 7. Move to a position further away. For this reason, in the main brake mode, the braking force by the lock shoe 6 cannot be obtained.
[0046]
<Brake release mode>
The brake release mode is a mode in which the brake does not act in any direction of the forward and backward movements of the wheelchair 100, and the main shoe 4 and the lock shoe 6 always move from the brake drum inner peripheral surface 3c as shown in FIG. It is supported at a distance.
[0047]
The operation of each component is as follows.
First, when the user operates the lever body 115 to slide the lever body 115 to the point B in FIG. 8 to switch to the brake release mode, the operation cam portion 8a is fixed in a neutral state, and each main shoe 4 is returned to the return spring. 13 is held at a position separated from the inner peripheral surface 3c of the brake drum.
[0048]
The lock shoe 6 is also restrained by the lock shoe return spring 7 as in the main brake mode, and the brake does not act even when the wheelchair 100 moves backward. As described above, in the brake release mode, since each of the main shoes 4 and the lock shoes 6 is held apart from the inner peripheral surface of the brake drum 3, the wheelchair 100 can be moved forward or backward in any direction. The brake does not work.
[0049]
<Auxiliary brake mode>
The auxiliary brake mode is a mode in which a brake is automatically applied when the wheelchair 100 moves backward, that is, when the wheels 101 rotate in the reverse direction. The braking force is generated by the lock shoe 6 described above.
[0050]
To apply a brake in the auxiliary brake mode, first, the lever body 115 is slid to the point C in FIG. Then, when the wheelchair 100 approaches a slope or the like and the wheels 101 reverse, the brake is automatically applied regardless of the user's intention.
[0051]
The operation of each component is as follows.
When the lever body 115 is slid to the point C in FIG. 10 to apply the auxiliary brake, the operation cam portion 8b rotates in the direction of arrow K in FIG. 9 to move the lock shoe body 65 to the inner peripheral surface 3c of the brake drum 3. Move closer. The lock lining 60 comes into contact with the inner peripheral surface 3 c of the brake drum 3 with the movement of the lock shoe body 65.
[0052]
When the brake drum 3 rotates in the reverse direction, a self-energizing effect (wedge effect) is generated between the lock shoe 6 and the brake drum 3, and rotation in the brake drum reverse direction is restricted.
When the user of the wheelchair 100 moves forward by rotating the wheel 101 in the normal rotation direction, the brake drum 3 also rotates in the normal rotation direction, so that the engagement between the lock shoe 6 and the brake drum inner peripheral surface 3c occurs. The state is released and you can move forward.
[0053]
Note that even when the wheel 101 is rotating forward in the auxiliary brake mode, the contact state between the lock shoe 6 and the inner circumferential surface 3c of the brake drum is maintained. The brake is not applied to the brake drum 3 because the energizing effect is not exhibited.
[0054]
When the lever body 115 is switched to another mode, the operating cam portion 8b rotates in the direction of arrow D in FIG. It returns to the fixed position separated from the peripheral surface 3c. Therefore, even when the wheel 101 rotates in the reverse direction, the brake is not applied.
[0055]
As described above, in the drum brake device according to the present embodiment, the width (depth) of the brake drum is reduced because the brake drum 3 is mounted between the wheel 101 and the frame 104. Further, since the lock shoe 6 regulates the rotation of the brake drum 3 with a contact area much smaller than that of the main brake shoe, a large shearing force acts between the lock shoe 6 main body and the lock lining. .
[0056]
For this reason, in this embodiment, in order to secure the fixing strength between the lock shoe main body 65 and the lock lining 60 more sufficiently, in addition to the back side of the lock lining 60 which is the original fixing place, the lock shoe is locked by the side surface of the lock shoe main body 65. The lining 60 is fixed.
[0057]
First, as shown in FIGS. 11 to 13, the lock lining 60 includes a substrate portion 60 a forming a friction surface that is in contact with the inner peripheral surface 3 c of the brake drum 3, and a lock shoe main body extending from the substrate portion 60 a. And a side plate portion 60b extending along the side surface 65a of the base 65. The lock lining 60 is fixed to the lock shoe main body 65 via the side plate portion 60b in addition to the back surface side of the substrate portion 60a.
[0058]
In the present embodiment, in fixing the lock lining 60 and the lock shoe main body 65, first, an adhesive is applied to the back surfaces of the substrate portion 60a and the side plate portion 60b and adhered to the lock shoe main body 65. In the side plate portion 60b, the lock shoe body 65 and the side plate portion 60b are fixed using rivets R.
[0059]
At the tip of the lock shoe main body 65, which is a fixing portion of the lock lining 60, a contact surface 65b is formed which comes into contact with the end surface of the substrate portion 60a and restricts the movement of the lock lining 60.
[0060]
More specifically, the front end of the lock shoe body 65 is cut out from the normal rotation direction to the reverse rotation direction, and the end face of the substrate portion 60a located in the reverse rotation direction of the brake drum 3 is positioned on the reverse rotation side of the notch. The lock lining 60 is fixed to the tip of the lock shoe body 65 in a state where the lock lining 60 abuts against the abutting surface (end surface) 65b.
[0061]
Therefore, when the self-energizing effect is exerted on the lock lining 60 in the auxiliary brake mode, the end face of the substrate portion 60a is pressed against the abutting surface 65b formed by the notch, and the brake drum rotates in the reverse direction. The movement of the lock lining 60 (substrate unit 60a) to the fin is restricted. Further, in the present embodiment, the notch constitutes the restricting portion according to the present invention.
[0062]
As described above, in the brake device 1 according to the present embodiment, the lock lining 60 is fixed to the lock shoe main body 65 even at a position different from the back side of the lock lining 60 which is the original fixing place. Therefore, a sufficient fixing area between the lock shoe main body 65 and the lock lining 60 can be ensured, so that the lock lining 60 can be more securely fixed to the lock shoe main body 65.
[0063]
In the present embodiment, as described above, the lock lining 60 is extended to the side surface of the lock shoe main body 65 and is fixed to the side surface 65a of the lock shoe main body 65. That is, in order to secure the fixing area of the lock lining 60 by using the side surface of the lock shoe main body 65 which is not affected by the area of the original lining fixing surface P of the lock shoe main body 65, the fixing strength of the lock lining 60 is sufficiently increased. Can be.
[0064]
The lock shoe main body 65 has an abutment surface 65b that contacts the end face of the lock lining 60 located in the reverse rotation direction of the brake drum 3 and restricts the movement of the lock lining 60 in the brake drum reverse rotation direction. Therefore, for example, even when the lock lining 60 is fixed on the side surface of the lock shoe main body 65 as in the present embodiment, the shearing force acting on the fixing place can be received by the abutting surface 65b of the notch. .
[0065]
Further, in the present embodiment, since the lock lining 60 is formed of an aluminum-based metal material as described above, sufficient mechanical strength can be secured while suppressing excessive wear of the brake drum 3. In addition, although various examples can be given as the aluminum-based metal material, in the present embodiment, an A6061 aluminum alloy of Japanese Industrial Standard (JIS) is used.
[0066]
The above-described embodiment is merely an example, and details thereof can be appropriately changed according to the specifications of the brake device.
For example, as shown in FIG. 15, the side plate portion 60b of the lock lining 60 is formed so as to extend along both side surfaces of the lock shoe body 65, and the lock lining 60 is fixed on both side surfaces of the lock shoe body 65. Configurations are possible. As long as the fixed state of the lock lining 60 can be maintained at a position different from the back surface side of the lock lining 60, the fixing place can be changed as appropriate.
[0067]
In the above description, the lock lining 60 is riveted and fixed to the lock shoe main body 65, but this is not always necessary, and the lock lining 60 is fixed with sufficient fixing strength using only the rivet R or only the adhesive. be able to. That is, since the fixing area is large, sufficient fixing strength can be obtained.
[0068]
Further, in the above-described embodiment, the abutment surface 65b that is in contact with the end surface of the lock lining 60 (substrate portion 60a) located in the reverse rotation direction of the brake drum 3 is formed on the lock shoe body 65 side, as shown in FIG. Alternatively, the notch shape may be such that it can also contact the end face of the lock lining 60 located in the normal rotation direction of the brake drum 3. In this case, the displacement of the lock lining 60 in the forward rotation direction of the brake drum 3 as well as the reverse rotation direction of the brake drum 3 can be restricted.
[0069]
In the above description, the lock shoe body 65 and the lock lining 60 are fixed in the lock shoe 6 as an example. However, the fixing method of the lining can be applied to the main shoe 4 as a matter of course.
[0070]
In the above-described embodiment, the brake device 1 for the wheelchair 100 has been described as an example. It can also be applied to brakes for automobiles.
[0071]
【The invention's effect】
As described above, according to the present invention, there is provided a lining fixing technique capable of fixing the lining with sufficient fixing strength even in a brake device having a structure in which the area of the lining fixing surface is small and it is difficult to secure the fixing strength of the lining. it can.
[Brief description of the drawings]
FIG. 1 is a side view of a wheelchair employing a drum brake device.
FIG. 2 is a perspective view showing a state where the brake drum according to the present embodiment is fixed to wheels.
FIG. 3 is a side view showing a brake lever according to the embodiment.
FIG. 4 is a plan view of a base plate provided on the brake lever shown in FIG. 3;
FIG. 5 is a diagram showing the operation of each component in the main brake mode of the brake device shown in the present embodiment.
FIG. 6 is a diagram showing a position of a brake lever in a main brake mode of the brake device shown in the present embodiment.
FIG. 7 is a view showing the operation of each component in the brake release mode of the brake device shown in the present embodiment.
FIG. 8 is a diagram showing a position of a brake lever in a brake release mode of the brake device shown in the present embodiment.
FIG. 9 is a diagram showing the operation of each component in the auxiliary brake mode of the brake device shown in the present embodiment.
FIG. 10 is a diagram showing a position of a brake lever in the auxiliary brake mode of the brake device shown in the present embodiment.
FIG. 11 is an enlarged perspective view of a main part showing a fixed state of the lock lining and the lock shoe body shown in the present embodiment.
FIG. 12 is a side view of the lock shoe shown in the present embodiment.
FIG. 13 is a sectional view taken along line AA ′ of FIG. 12;
FIG. 14 is a side view of the lock shoe main body in which abutment surfaces are formed in both the forward rotation direction and the reverse rotation direction of the brake drum.
FIG. 15 is a cross-sectional view of a lock lining provided with side plate portions extending along both side surfaces of the lock shoe main body.
[Explanation of symbols]
1 Brake device
3 brake drum
3a base
3b Perimeter wall
3c Inner peripheral surface
4 Main shoe (braking member)
4a Contact point
4b Connecting hole
5 Back plate
5a Return spring support arm
5b Axle insertion hole
6 Rock shoe (braking member)
6a Connecting hole
6b Contact point
7 Rock shoe return spring
8 Working cam
8a Operating cam for main shoe
8b Operating cam for lock shoe
10 Main shoe body (holding member)
11 Lining (friction member)
12 anchor pin
13 Return spring
15 Operating lever
15b Operating lever return spring
60 Lock lining (friction member)
60a Substrate
60b side plate
65 Lock shoe body (holding member)
65a Side view of rock shoe body
65b abutment surface
100 wheelchair
101 wheels
102 hub
103 spoke
104 frames
110 brake lever
111 wires
112 Base plate
112a Mode switching groove
113 Brake lever support bracket
114 Brake lever support pin
115 lever body
116 Railing
P lining fixing surface
R rivet

Claims (5)

A braking member having a rotating member that rotates with the wheel, a friction member that contacts a friction surface of the surface to regulate the rotation of the rotating member, and a holding member to which the friction member is fixed,
A braking member, wherein the friction member is fixed to a holding member at least at a position different from a back surface side thereof. The friction member includes a substrate portion forming the friction surface, and a side plate portion extending from the substrate portion and extending along a side surface of the holding member,
The braking member according to claim 1, wherein the friction member is fixed to a side surface of the holding member via the side plate portion. The holding member is provided with a regulating portion that contacts an end surface of the friction member positioned in the rotation direction of the rotating body to regulate movement of the friction member in the rotation direction of the rotating body. The braking member according to claim 1. The braking member according to any one of claims 1 to 3, wherein the friction member is formed of an aluminum-based metal material. A method of fixing a friction member in a braking member, comprising: a friction member that regulates rotation of the rotation body by contacting a friction surface of the surface with a rotation body that rotates with the wheel; and a holding member to which the friction member is fixed. So,
A method of fixing a friction member, wherein the friction member is fixed to a holding member at least at a position different from a back side thereof.

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