JP4451090B2 - Torque stop structure of motorcycle brake device - Google Patents

Description

  The present invention relates to a torque stop structure for a brake device disposed in a rear wheel portion of a motorcycle.

A brake device is attached to the rear wheel portion of the motorcycle. When the brake device, for example, the disc brake device is attached to the rear wheel portion, the brake disc (movable side portion of the brake device) is attached integrally with the rear wheel, and the vehicle body side A caliper unit (a fixed side portion of the brake device) that clamps the brake disc from both sides is attached integrally. When the rider operates the brake lever or the brake pedal, the disc pad of the caliper unit squeezes the brake disc on the wheel side from both sides, and the brake acts on the rear wheel. Therefore, the caliper unit needs a torque stop structure (torque receiving structure) that only receives a brake reaction force generated corresponding to the brake force (rotational torque) between the caliper unit and the vehicle body side.
As such a torque stop structure, it is necessary to attach one place of the caliper unit to the vehicle body side coaxially with the axle of the rear wheel and to provide a restraining means for restraining the rotation of the caliper unit at another position. is there. For example, as such a restraining means, there is provided a non-circular protrusion on the axle coaxially with the axle, and a recess corresponding to the protrusion is provided on the vehicle body side so as to be non-rotatably locked. Yes (see Patent Document 1).
Japanese Utility Model Publication No. 6-40340.

By the way, in general, the rear wheel of a motorcycle is supported by a swing arm, and this swing arm can swing within a predetermined angle around a swing center provided on the main body side of the frame. A shock absorber is also provided to reduce the shock received from the road surface.
In the case where a chain or a belt is used as the power transmission means from the engine to the rear wheel, a so-called chain pulling structure is employed in order to cope with the extension of the chain and the like caused by use.

  Therefore, the torque stop structure is affected by this movement (adjustment) even when the so-called “chain pulling” described above is performed at an appropriate time and the axle of the rear wheel is moved rearward with respect to the vehicle body. It is necessary to configure so as to exhibit a torque stop function.

However, the torque stop structure of the brake device including the brake device described in Patent Document 1 is provided on one swing arm arranged on a line connecting the swing center of the swing arm and the axle center of the rear wheel. The locking means for receiving the brake reaction force is provided, and the locked means to be locked by the locking means is provided in the unit on the fixed side of the brake device. For this reason, the unit on the fixed side (fixed side part) of the brake device is arranged in a state where it is located at a part (front part) far from the swing center than the axle of the rear wheel of the swing arm.
In the case of Patent Document 1, since a large rotational torque acts on the protrusion and the recess, it is necessary to make the rigidity of this portion considerably high. Also, it acts as a large bending moment on the swing arm. In particular, when the motorcycle is large, the inertial force becomes very large and the braking force becomes large. Therefore, if the configuration as described above is adopted, the structure becomes bulky.

As another torque stop structure, a disc brake device is used as a brake device. One part of the caliper unit is fixed coaxially with the axle, and another part of the caliper unit is held on the axle of the swing arm. There is also a type of fixing at a position separated from the position via a rotation restricting bracket.
However, in the case of this type, since the fixed side portion (caliper unit) of the brake device is located at a position biased toward the swing center side, the brake reaction force is applied to the place where the mounting bracket is attached to the swing arm. The resulting large bending moment will act. Therefore, in the case of such a brake torque stop structure of this type, it is necessary to increase the rigidity of the swing arm in proportion to the increase in size of the motorcycle. For this reason, the swing arm becomes bulky and heavy.

  The present invention has been made in view of such circumstances, and the brake device can be provided compactly without being largely biased from the rear wheel axle to the swing center side of the swing arm, and the rear wheel can be swung freely. An object of the present invention is to provide a torque stop structure for a motorcycle brake that can reduce the weight of the swing arm that is supported by the motorcycle.

A torque stop structure for a brake of a motorcycle according to the present invention includes an axle holding hole that holds a rear wheel at a rear end portion, and a swing arm that is pivotally supported about a swing center with respect to a vehicle body. A torque stop structure for a brake device disposed on the rear wheel portion of the motorcycle,
Longitudinal direction parallel to the line connecting the center of the axle and the swinging shaft at a position separated from the line connecting the center of the axle and the swinging shaft mounted in the axle holding hole of the swing arm. And a locking means that is locked in a direction other than the longitudinal direction with respect to the locking means and that is movable in the longitudinal direction. It is characterized by.

  According to the brake torque stop structure of the motorcycle configured in this way, when the locking means is formed apart from the line connecting the center of the axle of the rear wheel and the swing center, the brake device The brake device can be provided in a state where the end portion located on the swing center side from the axle of the rear wheel is as close as possible to the axle side of the rear wheel. Moreover, it is possible to obtain a sufficient dimension from the axle of the rear wheel to the position where the braking force of the brake device acts. Therefore, it is possible to provide the brake device in a compact manner without being greatly deviated from the axle center of the rear wheel toward the swing center side.

  According to the brake stop structure for a motorcycle according to the present invention, the brake device can be provided in a compact manner without being greatly separated from the axle of the rear wheel portion toward the swing shaft. In addition, the swing arm that swingably supports the rear wheel of the motorcycle is not bulky and can be reduced in weight.

  In the torque stopper structure of the brake device, the swing arm has an upper portion, a lower portion, and a connecting portion that connects these rear ends to each other in a side view, and either the upper portion or the lower portion When the locking means is provided, the upper portion or the lower portion can be arranged obliquely with respect to the longitudinal direction, and the locking means is arranged obliquely in this way. If it can be arranged on the lower part, the distance from the locking means to the part performing the brake function of the brake device can be reduced on the line connecting the axle center of the rear wheel and the swing center of the swing arm. Also, the brake reaction force acting as a bending moment on the upper or lower part is perpendicular to the longitudinal direction of the upper or lower part. Possible to reduce the direction of the component force that. For this reason, it becomes possible to make the bending moment which acts on the said upper part or a lower part as small as possible. Therefore, the brake torque stop structure is suitable for a large motorcycle. Needless to say, the present invention can be applied to medium-sized or small-sized motorcycles other than large-sized motorcycles, and even in such a case, the above-described effects such as weight reduction of the swing arm can be obtained.

  Further, in the torque stop structure of the braking device for a motorcycle, the locking means is a protrusion having a substantially square cross section, and the locked means is a groove recessed in a substantially square shape corresponding to the locking means. If it exists, the shape in the side view of a swing arm can be simplified. Further, this is a preferable configuration in that the section modulus and the moment of inertia of the section of either the upper part or the lower part can be increased.

  Further, in the torque stopping structure of the braking device for the motorcycle, any one of the upper portion and the lower portion where the locking means is provided includes a swing center of the swing arm and a center of the axle of the rear wheel. If the crossing angle with respect to the line connecting the two is a preferable configuration in that the component force acting as a bending moment on one member of the swing arm caused by the brake reaction force can be reduced.

  Further, in the torque stop structure of the brake device for the motorcycle, when either one of the upper portion and the lower portion is the upper portion of the swing arm, a fixed side portion (a main body portion such as a caliper unit) of the brake device is provided. This is a preferable configuration in that it is positioned away from the ground upward.

  Further, in the torque stop structure of the motorcycle brake device, if the portion where the locking means of the swing arm is formed of a solid material, the appearance is smart and the rigidity is high. In obtaining, this is a preferred configuration. In such a case, if the portion other than the portion where the locking means is formed is formed in a pipe shape, it is a preferable configuration for reducing the weight.

  Hereinafter, a torque stop structure of a braking device for a motorcycle according to the present invention will be specifically described with reference to the drawings.

  FIG. 1 is a side view of an entire motorcycle having a brake torque stop structure according to the present invention, FIG. 2 is a partially enlarged view of a swing arm portion of the motorcycle shown in FIG. 1, and FIG. It is an arrow view.

As shown in FIG. 1 or FIG. 2, the swing arm 2 of the motorcycle has a V-shaped side view as if the bent portion (joint portion) 2D is positioned on the rear end side of the vehicle. Shape, in other words, these two members (upper member) which are connected in an edge shape at each rear end of the two members (upper member 2A, lower member 2B) and bifurcated at the other end (front end) side The other end of the lower member 2 </ b> A (referred to as 2 </ b> A, the lower member 2 </ b> B) has a shape like a triangular shape in which the other end is connected integrally (with a rigid coupling structure) by the connecting member 2 </ b> C. As shown in FIG. 2, the axle that holds the axle 8 of the rear wheel 20 on the bent portion (rear portion) 2D where the upper member 2A and the lower member 2B constituting the swing arm 2 are connected. A holding hole 2a (see FIG. 2) is formed. The axle holding hole 2a is a long hole extending in the direction of a line L1 connecting a swing shaft O _{2 (} described later) and the center of the axle 8 of the rear wheel. The axle 8 is held at a predetermined position of the elongated hole of the axle holding hole 2a with respect to the axle holding hole 2a via the axle fixing bracket 23. Further, the axle fixing bracket 23 is provided with bolts 21 and nuts 22 for adjusting the axle position (for pulling the chain).
As shown in FIG. 2, the swing arm 2 has a swing shaft O ₂ that is the center (swing center) of a swing hole 2b formed at a substantially central portion in the vertical direction of the connecting member 2C. In the center, the rear ends of the connected upper member 2A and lower member 2B are arranged to swing.
Then, on the upper member 2A slightly spaced from the axle holding hole 2a of the swing arm 2, a protrusion 2E (refer to a broken line in FIG. 3) having a substantially rectangular cross section (more precisely, a substantially trapezoidal cross section) as a locking means. ) Is formed so that the longitudinal direction of the projection 2E extends in parallel to a line L1 connecting the swing axis O ₂ and the center of the axle 8 of the rear wheel.

The mounting bracket 4A for attaching the caliper unit 4 which is the fixed side portion of the brake device 3 to the vehicle body side has a substantially rectangular shape corresponding to the cross-sectional shape of the protrusion 2E (more precisely, a substantially trapezoidal cross-sectional shape). A groove 4B having a groove cross section extends in the longitudinal direction of the protrusion 2E. The groove 4B is closed on the axle holding hole 2a side (axle side; rear end side) of the mounting bracket 4A, and is open forward on the swing shaft O ₂ side (overall side). . Therefore, when the projection 2E is attached to the groove 4B, it can be inserted from the open side. After the insertion, the protrusion 2E can move in the longitudinal direction in the groove 4B and can be locked in directions other than the longitudinal direction. The movement in the longitudinal direction is restrained by the axle fixing bracket 23 so as to be adjustable.
Further, as shown in FIG. 3, a mounting hole 4c for inserting the axle 8 is formed at the rear end (lower end) of the mounting bracket 4A. Further, an attachment hole 4d for attaching the caliper unit 4 via a bolt 4g is formed at the upper end of the mounting bracket 4A.
As shown in FIG. 3, the caliper unit 4 attached to the attachment hole 4d is paired on the left and right inside the caliper unit 4 with respect to the brake disc 6 disposed therebetween. Brake pads 4d ₁ and 4d ₂ are provided. Then, the caliper unit 4 includes a hydraulic piston 4p of the brake pad 4d _2, to press the brake pad 4d ₁ side is fixed to the fixed side of the caliper unit 4. Then, when the rider operates a brake pedal (not shown), the brake pad 4d ₂ is close to the brake pad 4d ₁ side and clamps (clamps) the brake disc 6 disposed therebetween from both sides, It tries to stop the rotation of the brake disc 6 by friction.
The mounting bracket 4A arranged as described above extends in a direction obliquely upward to the right (approximately 45 degrees in the upper right in this embodiment) with respect to the axle 8 in FIG. The caliper unit 4 attached to the mounting bracket 4A is located in a direction obliquely upward to the right in FIG. 2 with respect to the axle 8 (approximately 75 degrees to 65 degrees in the upper right in this embodiment). It will be.

Therefore, in the present embodiment, the caliper unit 4 moves from the center of the axle 8 to the swing axis O ₂ side on a line L1 connecting the center of the axle 8 and the swing axis O ₂ (swing center). Without being greatly separated, that is, without projecting greatly toward the swing axis O _2, it can be compactly arranged. In addition, the brake pads 4d ₁ and 4d ₂ of the caliper unit 4 are located at a position away from the center of the axle 8 by a sufficient dimension.

As described above, the caliper unit 4 is inclined from the center of the axle 8 with respect to the line L1 connecting the swing axis O ₂ and the center of the rear axle 8 (approximately 75 in this embodiment). The upper member 2 </ b> A of the swing arm 2 even when the brake operation is performed and the reaction force P ₁ (see FIG. 2) of the brake force acts on the caliper unit 4. The component force acting as a bending stress (the component force in the direction perpendicular to the upper member 2A) P ₂ (see FIG. 2) itself becomes small (in this embodiment, the force is about 50%), since the position on the upper member 2A of the action of force P ₂ is located near the center of the axle 8, the bending moment acting on said upper member 2A becomes extremely small. In FIG. 2, the reaction force P ₁ is generated in the tangential direction of a circle (brake disc 6) centered on the axle 8, and the component force P ₂ acts in a direction perpendicular to the upper member 2A of the reaction force P _1. It is a component force to do.
Further, since the swing arm 2 adopts a ramen structure in which each connection portion of the upper member 2A, the lower member 2B, and the connecting member 2C has a rigid coupling structure, the swing arm 2 is structurally extremely rigid. Become.

  For this reason, the section modulus and the section moment of inertia of the upper member 2A can be reduced, and the weight of the swing arm 2 can be reduced.

  Further, in the so-called “chain pulling” described above, the nut 18 that fixes the axle 8 to the swing arm 2 is loosened, and the nut 22 of the axle fixing bracket 23 that positions the axle 8 in the longitudinal direction is loosened, When the bolt 21 is rotated and the axle 8 is moved rearward with respect to the swing arm 2, the projection 2E moves in the longitudinal direction along the groove 4B in the groove 4B. As described above, the engagement state between the protrusion 2E and the groove 4B can be maintained in the same manner as the state before the “chain pull” by this “chain pull”.

By the way, the swing arm 2 is configured as follows in the case of this embodiment. That is, the swing arm 2 is partly manufactured by forging, part is manufactured by a pipe member, and the swing arm 2 having the above-described form is formed by connecting them. Specifically, as shown in FIG. 2 or 3, the bent portion 2D, that is, the rear portion including the connecting portions 2f ₁ and 2f ₂ of the axle holding hole 2a, the upper member 2A, and the lower member 2B is forged. Manufactured by solid material. Note that casting may be used instead of the forging.
Then, the intermediate portion of the upper member 2A and the lower member 2B is constituted by the pipe member 2p _1, 2p _2, the pipe member 2p _1, 2p rear end the connection portion 2f ₁ of _2, 2f ₂ to the welding (screw Worn or fitted). Further, solid materials 2i ₁ and 2i ₂ constituting the front end portions of the upper member 2A and the lower member 2B are welded (screwed or fitted) to the front ends of these pipe members 2p ₁ and 2p ₂ , respectively. Thus, the upper member 2A and the lower member 2B are configured, respectively.
The connecting portions 2f ₁ and 2f ₂ and the solid members 2i ₁ and 2i ₂ attached to both ends of the pipe members 2p ₁ and 2p ₂ are formed on the outer side as shown in FIG. When viewed from the left side of the motorcycle, the pipe members 2p ₁ and 2p ₂ are configured as if they are extended as they are on both sides, giving aesthetic considerations. The aesthetic consideration is that the connecting portions 2f ₁ and 2f ₂ and the solid materials 2i ₁ and 2i ₂ of the upper member 2A and the lower member 2B are projected outward so that the cross section thereof is substantially semicircular. This is realized. Further, this configuration contributes to increasing the rigidity of this portion.

According to the brake stop structure of the motorcycle thus configured, since the caliper unit 4 is attached to the upper member 2A disposed obliquely of the swing arm 2, the center of the axle 8 is Even if the distance between the rear wheel 20 and the rear wheel 20 is the same, the rear wheel 20 does not protrude greatly from the center of the axle 8 toward the swinging shaft O ₂ (front side), and as shown in FIG. 1 or FIG. It will be arranged compactly near the axle 8.

Further, as described above, the since the component force acting as a bending moment to the upper member 2A becomes smaller, it is possible to reduce the section modulus or cross-sectional secondary M o Placement of the upper member 2A, unsprung load of the motorcycle The weight of (foot load) can be reduced.

By the way, in the said Example, although the latching means was comprised by the protrusion and the to-be-latched means was formed by the groove | channel, these may become a reverse structure. Moreover, as long as the cross-sectional shape of a protrusion and a groove | channel can be latched, it may be other than the said rectangular shape, and other shapes, such as V-shaped cross section, may be sufficient.
Moreover, in the said Example, although the caliper unit is arrange | positioned at the upper member of a swing arm, even if it arrange | positions at a lower member, there can exist the same effect.
Furthermore, the swing arm 2 is formed by integrating the upper member 2A, the lower member 2B, and the connecting member 2D, that is, as shown in FIGS. 4 (a) and 4 (b). A configuration in the form of a truncated triangular body in which the inside of the portion 2M is hollow and the whole is the rear end and the vertical width is small and the front end is large may be employed. In FIG. 4, 2E is a protrusion that is the locking means formed on the upper portion (or may be a lower portion) of the swing arm 2, and 2a is the axle holding hole 2a. Alternatively, as shown in FIG. 4C, which is a cross-sectional view taken at the same location as in FIG. 4B, the swing arm 2 is made of a solid material in the cross-sectional view, and the patent 2E is formed on the inner surface. May be formed. In such a case, it is excellent in that it can be produced by forging or casting. In order to reduce the weight, an aluminum material or the like may be used. Note that the swing arm 2 illustrated in FIG. 4C may have the same configuration as that illustrated in FIG.
Further, as shown in FIG. 5, the swing arm 2 can be configured such that a middle member 2K is disposed between the upper member 2A and the lower member 2B. In FIG. 5, 2E is a protrusion as the locking means, and 2a is the axle holding hole 2a.

1 is an overall side view of a motorcycle having a brake torque stop structure according to the present invention. Fig. 2 is a partially enlarged view of a swing arm portion of the motorcycle shown in Fig. 1. It is the III-III arrow line view of FIG. It is a figure which shows the structure of the principal part of the swing arm concerning another Example, (a) is a side view, (b) is IVb-IVb arrow line view of (a), (c) is implementation different from (b) It is IVb-IVb arrow line drawing of (a) concerning an example. FIG. 5 is a side view showing a configuration of a main part of a swing arm according to another embodiment different from FIG. 4.

Explanation of symbols

2 ... Swing arm 2A ... Upper member (upper part)
2a ... Axle holding hole 2E ... Locking means (2E)
4B: Locked means (4B)
8 ... Axle 20 ... Rear wheel O ₂ ... Oscillation axis L1 ... Line connecting the oscillation axis and the center of the axle of the rear wheel

Claims (7)

It is arranged at the rear wheel portion of a motorcycle having an axle holding hole for holding the rear wheel at the rear end portion and having a swing arm pivotally supported about the swing axis with respect to the vehicle body. Torque stop structure of the brake device,
The swing arm includes an upper portion and a lower portion that extend in the front-rear direction of the vehicle body so as to be separated from each other in the vertical direction as they move from the rear end side to the front end side in a side view, and the rear ends of the upper portion and the lower portion. A rear portion that is connected and has the axle holding hole, and a connecting member that connects a front end portion of the upper portion to an upper end portion and connects a front end portion of the lower portion to a lower end portion;
Of one of the upper portion and the lower portion, at a position spaced in the vertical direction from the center and a line connecting the said swing axis of the axle mounted on the axle holding hole of the swing arm, the center of the axle And a locking means for movably locking in parallel with the line connecting the swing shaft and
The latched means that movably engaged to the locked and the movable direction in a direction other than the movable direction on the fixed portion with respect to the locking means of the brake device is provided,
A torque stop structure for a brake device of a motorcycle, wherein the connecting member is provided with the swing shaft . The torque stop structure for a brake device for a motorcycle according to claim 1, wherein the swing shaft is provided at a substantially central portion in the vertical direction of the connecting member . The torque of the brake device for a motorcycle according to claim 1 or 2, wherein a portion from the portion where the locking means is formed to the portion where the axle holding hole is formed is made of solid material. Stop structure. The torque stopper structure for a brake device for a motorcycle according to any one of claims 1 to 3, wherein an intermediate portion of the upper portion and the lower portion in the front-rear direction is configured by a pipe member . The rear part of the upper part and the lower part and the front end part thereof are made of solid material, and are projected outward so that their cross-sections are substantially semicircular, the rear end part and the front end part A portion formed by a pipe member having a circular outer cross section is provided between the pipe member and the pipe member is configured to extend from the front end portion to the rear end portion. 4. A torque stop structure for a motorcycle brake device according to any one of 4 above. The rear part of the swing arm is composed of a bent part whose front end side is bifurcated in the vertical direction, and the upper and lower ends of the front end part of the bent part are integrated with the rear end part of the upper part and the lower part. torque preventing structure of a motorcycle braking device according be formed in any one of claims 1 to 5, wherein the. The torque stop structure for a brake device for a motorcycle according to any one of claims 1 to 6 , wherein the locking means is provided at a rear end portion of the upper portion .

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