JP4300952B2 - Transmission device - Google Patents

Description

  The present invention relates to a transmission device in which a clutch device is provided on a countershaft to which engine power is transmitted.

  As shown in Patent Document 1, in a transmission device for a vehicle such as a motorcycle, a primary driven gear and a clutch device are provided at one end of a counter shaft supported by a pair of bearings in an engine case, and the clutch device is intermittently operated. A clutch release mechanism for performing the above is provided in the vicinity of the clutch device or at the counter shaft end portion on the side opposite to the clutch device. When the clutch device is connected, engine power is transmitted to the counter shaft through the primary driven gear and the clutch device.

In the invention of Patent Document 1, a coil spring is interposed between the engine case and the push rod in order to suppress the generation of noise due to the counter shaft and the push rod constituting the clutch release mechanism vibrating in the axial direction. I am wearing.
Japanese Patent Application Laid-Open No. 8-17776

  However, since the biasing force of the coil spring is applied to the clutch device itself in the above-described configuration and acts in the direction of disconnecting the clutch device, the biasing force of the coil spring must be significantly smaller than the clutch spring set load of the clutch device. In addition, such a weak urging force cannot sufficiently suppress vibrations in the axial and circumferential directions of the heavy counter shaft.

  Further, since the coil spring occupies a considerable space in the width direction inside the engine case, it has been difficult to make the engine compact.

  Further, the above configuration is applicable only when a rack and pinion type clutch release mechanism is provided adjacent to the clutch device, but the push rod type clutch release mechanism is provided on the counter shaft end on the opposite side of the clutch device. When it is provided in the part, it was difficult to apply.

  The present invention has been made in consideration of the above-described circumstances, and with a compact and highly flexible layout, it can handle all types of clutch release mechanisms and sufficiently vibrates the counter shaft in the axial and circumferential directions. Another object of the present invention is to provide a transmission device that can suppress the initial adjustment of the clutch release mechanism without variation.

In order to achieve the above object, a transmission device according to the present invention includes a countershaft supported by a pair of bearings in an engine case, and is provided on one end side of the countershaft to transmit power of a crankshaft to the countershaft. And a clutch release mechanism that disconnects the clutch device, and between the bearing of the pair of bearings that support the countershaft and the countershaft, with respect to the engine case The counter shaft is provided on one side in the axial direction , and is provided with an urging means for urging the counter shaft in the same direction as the pressing direction of the clutch release mechanism that disconnects the clutch device .

The clutch release mechanism for disconnecting the clutch device includes a release unit fixed to the left side surface of the engine case and covered with a release cover, a clutch release rod inserted into a hollow portion inside the counter shaft, and the clutch A clutch release bar interposed between a release rod and a release unit. The clutch device includes a clutch housing, a clutch hub, a plurality of drive plates and a driven plate, a clutch spring, a clutch release piece, and the like. The clutch release rod is configured to be disconnected by moving the clutch release rod to the right side of the counter shaft in the same direction as the biasing direction of the counter shaft by the biasing means .

Furthermore, the urging means is a wave washer that is elastically mounted between an inner race of one of the pair of bearings that support the countershaft and a step provided at the end of the countershaft.

  According to the transmission device of the present invention, the urging means directly urges the counter shaft to one side in the axial direction without passing through the clutch device, so the urging force of the urging device is related to the clutch spring set load of the clutch device. Therefore, the vibration in the axial direction and the circumferential direction of the heavy counter shaft can be sufficiently suppressed.

  In addition, since the direction in which the biasing means biases the counter shaft matches the pressing direction of the clutch release mechanism, the play of the clutch device is eliminated regardless of the type and position of the clutch release mechanism. Adjustment can be performed without variation.

  In addition, since the urging means is a wave washer, the urging means is configured with a very compact and high degree of layout freedom, can be applied to all types of clutch release mechanisms, and can contribute to the downsizing of the engine.

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

  FIG. 1 is a left side view of a motorcycle to which a transmission device according to the present invention is applied. In the motorcycle 1, a front fork 6 that supports a front wheel 5 on a front head of a vehicle body frame 4 including a main frame 2 and a rear frame 3 is rotatable left and right together with a handle bar 7, a headlamp 8, a front fender 9, and the like. A swing arm 13 that supports the rear wheel 12 is pivotally supported on a pivot shaft 11 that is pivotally supported and is installed on the rear lower portion of the main frame 2 so as to be rotatable up and down.

  2 is mounted so as to be suspended from the main frame 2, an intake device 17 and a fuel tank 18 are installed above the engine 15, and a rider seat 19 and a pillion seat are disposed on the rear frame 3. 20 is placed, a frame cover 21 is provided, a rear fender 23 is provided to cover the rear wheels so as to be positioned below these seats 19 and 20 and behind the engine 15, and a tail lamp unit 24 is provided at the rear part thereof. It has been.

  The engine 15 is a V-type two-cylinder engine in which two front and rear cylinders 26 </ b> F and 26 </ b> R are disposed in an engine case 25, and the power is transmitted to the rear wheel 12 through a chain 27. The intake device 17 includes a carburetor 28F of the front cylinder 26F, a carburetor 28R of the rear cylinder 26R, and an air cleaner box 29.

  The intake device 17 is disposed so as to cover the space between the front and rear cylinders 26F, 26R of the engine 15 and the front cylinder 26F. Specifically, the carburetor 28F is disposed at the upper part of the front cylinder 26F, the carburetor 28R is disposed at the upper front part of the rear cylinder 26R, and the air cleaner box 29 is disposed so as to straddle the front and rear cylinders 26F, 26R. It enters a recess 18 a formed on the lower surface of the fuel tank 18. A radiator 31 is installed on the front upper portion of the front cylinder 26F.

  The exhaust pipe 32 of the engine 15 collects the front exhaust pipe 33 extending from the lower surface of the front cylinder 26F, the rear exhaust pipe 34 extending from the rear surface of the rear cylinder 26R, and the front and rear exhaust pipes 33, 34. A collective exhaust pipe 35 and a muffler pipe 36 extending rearward from the collective exhaust pipe 35 through the right side of the rear wheel 12 are configured.

  FIG. 3 is a development view taken along line III-III in FIG. 2 and shows the overall configuration of the transmission device 40 according to the present invention. In the engine case 25, a crankshaft 41, a countershaft 42, and a drive shaft 43 are arranged in the vehicle width direction. The crankshaft 41 is pivotally supported by a plurality of metal bearings 44, and the countershaft 42 and the drive shaft 43 are pivotally supported by a pair of bearings 45, 46 and 47, 48, respectively.

  As shown also in FIG. 4, a primary driven gear 51 is rotatably supported on one end side of the counter shaft 42, for example, the right side of the right bearing 46 via a bearing 52, and a clutch device 53 is further provided on the right side thereof. A clutch release mechanism 54 is provided on the other end side of the counter shaft 42, for example, on the left side of the left bearing 45, and a primary drive gear 55 provided on the crank shaft 41 is engaged with the primary driven gear 51.

  The clutch device 53 is a general multi-plate clutch for a motorcycle, and includes a clutch housing 57, a clutch hub 58, a pressure plate 59, a plurality of drive plates 60 and a driven plate 61, a clutch spring 62, and a clutch. A release piece 63 and a thrust bearing 64 are provided.

  The clutch housing 57 is rotatably integrated with the right side surface of the primary driven gear 51 via a plurality of primary dampers 66 and a plurality of rivet pins 67. The primary damper 66 absorbs torque fluctuation shock that acts between the primary driven gear 51 and the clutch housing 57. The member 68 is an accessory drive gear for an oil pump or the like provided integrally with the primary driven gear 51, and the member 69 is a disc spring for giving hysteresis to the buffer function of the primary damper 66.

  On the other hand, the clutch hub 58 is rotationally fixed to the right end of the counter shaft 42 by a spline fitting 71 and a lock nut 72, and each drive plate 60 is incorporated in the inner periphery of the clutch housing 57, and is integrally rotated with the clutch housing 57. Each driven plate 61 is incorporated in the outer periphery of the clutch hub 58 and is rotatable integrally with the clutch hub 58 and movable in the axial direction.

  The drive plates 60 and the driven plates 61 are alternately stacked, and all the drive plates 60 and the driven plates 61 are pressed against the clutch hub 58 by the pressure plate 59 urged by the clutch spring 62. The frictional force between the plate 60 and each driven plate 61 causes the clutch housing 57 and the clutch hub 58 to rotate together, and the rotation of the crankshaft 41 is transmitted to the countershaft 42 and subsequent parts.

  The clutch release mechanism 54 is fixed to the left side surface of the engine case 25 and covered with a release cover 74, a clutch release rod 76 inserted into a hollow portion inside the counter shaft 42, and the clutch release rod 76. A clutch release bar 77 interposed between the release unit 75 and the release unit 75 is provided.

  The release unit 75 includes a substantially cylindrical release outer 79 and a release inner 80 provided on the inner periphery of the release unit 75. A ball groove is formed in a spiral shape between the members 79 and 80 so that a plurality of balls 81 are formed. It is intervened. The release outer 79 is fixed to the engine case 25 by a bracket 82 and cannot move in the axial direction. A release lever 83 is provided integrally with the release inner 80 and an adjustment screw 84 that contacts the left end of the clutch release bar 77. And a lock nut 85 is provided.

  When the clutch lever 87 shown in FIG. 1 is gripped, the release lever 83 is pulled through a wire mechanism (not shown), and the release inner 80 rotates. Then, the release inner 80 moves in the direction approaching the counter shaft 42 by the thrust action of the spiral ball groove and the ball 81, and as shown by the arrow F1 in FIG. 4, the clutch release bar 77, the clutch release rod 76, and the clutch release piece. 63 is moved to the clutch device 53 side.

  Then, the clutch release piece 63 moves the pressure plate 59 to the right against the urging force of the clutch spring 62, and the friction engagement between each drive plate 60 and each driven plate 61 is released, so that the clutch device 53 is connected. The rotation of the primary driven gear 51 is interrupted with respect to the counter shaft 42. When the clutch lever 87 is released, the clutch device 53 is connected, and the rotation of the crankshaft 41 is transmitted to the counter shaft 42 via the primary drive gear 55, the primary driven gear 51, and the clutch device 53.

  When adjusting the play of the clutch device 53, the lock nut 85 is loosened and the adjustment screw 84 is tightened until it abuts against the clutch release bar 77, and then the lock nut 85 is tightened while maintaining the position of the adjustment screw 84. As a result, clearances between the release inner 80 (adjustment screw 84), the clutch release bar 77, the clutch release rod 76, the clutch release piece 63, and the pressure plate 59 are clogged, so that there is no play in the clutch device 53, and the clutch device 53 The cut is better.

  By the way, gears A1 to A6 and B1 to B6 are provided between the left and right bearings 45 and 46 and 47 and 48 that support the counter shaft 42 and the drive shaft 43, respectively, and these gears A1 to A6 and B1 to B1 are provided. B6 is always meshed with each other and constitutes a six-speed shift transmission mechanism 91 together with a shift mechanism (not shown). During the speed change operation of the speed change transmission mechanism 91, the clutch device 53 is disconnected to make the speed change operation smooth.

  The left end of the drive shaft 43 protrudes outward from the left side surface of the engine case 25, and a drive sprocket 92 provided on the protruding portion and a driven sprocket 93 (see FIG. 1) provided on the left side surface of the rear wheel 12. The aforementioned chain 27 is wound between them.

  One of the pair of bearings 45 and 46 that support the counter shaft 42, for example, as shown in an enlarged view in FIG. 5, is a wave between the inner race 45a of the left bearing 45 and the step portion 42a near the left end of the counter shaft 42. A washer 95 is mounted. The wave washer 95 functions as an example of an urging means for urging the counter shaft 42 toward one side in the axial direction with respect to the engine case 25, whereby the counter shaft 42 is shown by an arrow F2 in FIGS. As shown, the engine case 25 is biased to the right.

  The wave washer 95 is optimal as an urging means, but the same urging action can be obtained by replacing it with a spring washer, a disc spring, or a washer made of an elastic material.

  The urging direction F <b> 2 of the counter shaft 42 by the wave washer 95 coincides with a direction F <b> 1 that presses the clutch release bar 77 and the clutch release rod 76 when the clutch release mechanism 54 disconnects the clutch device 53.

  According to the transmission device 40 configured as described above, the counter shaft 42 is always urged to the right in the axial direction by the urging action of the wave washer 95, so that the left and right sides supporting the counter shaft 42 are supported as shown in FIG. The inner races 45a and 46a of the bearings 45 and 46 are pressed outward in the vehicle width direction against the outer races 45b and 46b, whereby play between the inner races 45a and 46a, the outer races 45b and 46b, and the balls 45c and 46c. Approximates zero.

  For this reason, particularly when the transmission transmission mechanism 91 is in the neutral state and the clutch device 53 is connected, the counter shaft 42 vibrates in the axial direction and the circumferential direction. Can be effectively suppressed.

  Since the wave washer 95 urges only the counter shaft 42 without pressing the clutch device 53 itself, the urging force of the wave washer 95 can be increased regardless of the set load of the clutch spring 62 of the clutch device 53. Thus, vibrations in the axial direction and the circumferential direction of the heavy countershaft 42 can be sufficiently suppressed.

  The urging direction F2 of the counter shaft 42 by the wave washer 95 is the same direction as the direction F1 in which the clutch release mechanism 54 presses the clutch release bar 77 and the clutch release rod 76, so that the clutch is released regardless of the structure of the clutch release mechanism 54. The play of the release mechanism 54 (clutch device 53) is eliminated to improve the disconnection of the clutch device 53, and the initial adjustment of the clutch release mechanism 54 by the adjusting screw 84 can be performed without variation.

  In addition, since the wave washer 95 is used as the urging means, the urging means is configured with a much more compact and higher layout freedom than when a coil spring or the like is used as the urging means, which greatly reduces the size of the engine 15. Can contribute.

  Further, not only the transmission device 40 provided with the clutch release mechanism 54 on the opposite side of the clutch device 53 as in the present embodiment, but also a rack and pinion type clutch release mechanism as in the above-mentioned Patent Document 1 is used as the clutch device. Even when they are provided adjacent to each other, the countershaft can be urged to one side in the axial direction with respect to the engine case by an urging means such as a wave washer. It can correspond to the mechanism.

1 is a left side view of a motorcycle to which a transmission device according to the present invention is applied. Fig. 2 is a left side view of the engine of the motorcycle shown in Fig. 1. The expanded view developed along the III-III line of FIG. FIG. 4 is an excerpt of the counter shaft, clutch device, clutch release mechanism, and the like shown in FIG. 3. The figure which expanded the V section of FIG. 4, and showed embodiment of this invention. Sectional drawing of the bearing which shows the effect | action by a wave washer.

Explanation of symbols

25 Engine case 40 Transmission device 41 Crankshaft 42 Counter shaft 45, 46 Bearing 45a, 46a Inner race 53 Clutch device 54 Clutch release mechanism 95 Wave washer F1 functioning as an example of urging means F2 Push direction F2 of the clutch release mechanism Biasing means Energizing direction by

Claims (3)

A countershaft supported by a pair of bearings in the engine case, a clutch device provided at one end of the countershaft to transmit the power of the crankshaft to the countershaft, and a clutch release mechanism for disconnecting the clutch device A counter shaft on one side in the axial direction with respect to the engine case , between one bearing of the pair of bearings supporting the counter shaft and the counter shaft, and the clutch device A transmission device comprising biasing means for biasing in the same direction as a pressing direction of a clutch release mechanism for disconnecting connection . The clutch release mechanism for disconnecting the clutch device includes a release unit fixed to the left side surface of the engine case and covered with a release cover, a clutch release rod inserted into a hollow portion inside the counter shaft, and the clutch release rod. And a clutch release bar interposed between the clutch unit and the release unit. The clutch device comprises a clutch housing, a clutch hub, a plurality of drive plates and a driven plate, a clutch spring, a clutch release piece, and the like. The clutch device is configured to disconnect the clutch device by moving the clutch release rod to the axial right side of the counter shaft in the same direction as the biasing direction of the counter shaft by the biasing means. Transmitter described in Equipment. The said urging | biasing means is a wave washer elastically mounted between the inner race of one bearing of a pair of bearing which supports a countershaft, and the step part provided in the edge part of the countershaft. Transmission device.

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