JPS6132191Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a transmission with a torque converter suitable for motorcycles.

If you want to install a hydraulic torque converter while maintaining the basic layout widely used in motorcycles with manual transmissions, the torque converter should be installed where the clutch was previously installed (on the side). The most convenient location is the rear part of the engine's crankcase (to the right of the transmission chamber).
However, as shown in Figure 1, the torque converter a is installed in the conventional clutch device location, and the input gear b and crankshaft c are connected to the left end of the torque converter.
If the rightmost gear d is engaged directly, the torque converter is larger in diameter and width than the clutch, so the outer wall on the right side of the engine and transmission unit will protrude further to the right, hitting the driver's right foot. . Therefore, the driver's riding posture is
This results in an unnatural situation where only the right leg is opened further outwards, resulting in a very poor riding feeling.
Furthermore, if a partition wall h for forming a torque converter chamber g is provided on the right side case f fixed to the crankcase e to cover the gear d and the torque converter a, the structure of the right side case f becomes complicated and the cost increases. Inevitable.

The present invention moves the wall between the conventional clutch chamber (torque converter chamber in the present invention) and transmission chamber to the left side (towards the center of the vehicle body) to secure a space for accommodating the torque converter. The sprocket and chain that connect the torque converter and the crankshaft are placed on the right side of the torque converter housed inside, and a damper is built into the sprocket on the torque converter side. Furthermore, the structure of the right side case has been simplified, making it possible to reduce costs. Next, it will be explained with reference to the drawings.

In Fig. 2, the first half of the space inside the crankcase 1 is a crank chamber 2, and the second half is a transmission chamber 3.The crankshaft 4 arranged in the crank chamber 2 extends in the left and right vehicle width direction, and has a sprocket 5 at the right tip. has. A manually-selectable gear transmission 6 is incorporated within the mission chamber 3. Right side wall 3a of mission room 3
By moving the torque converter chamber 8 toward the vehicle center OO side (left side), a torque converter chamber 8 for accommodating the torque converter 7 is formed outside the right side of the transmission chamber 3. 9 is the right case. The left side wall 3b of the transmission chamber 3 is also moved toward the vehicle center O-O side, and the output sprocket 10 is located outside the left side wall 3b.
A left side case 12 is attached (or is provided integrally) across a gap 11 for arranging the
The clutch 1 is placed in the clutch chamber 13 inside the left case 12.
4 is placed. 15 is a cover.

The torque converter 7 includes a pump impeller 17 on the input side, a turbine impeller 18 on the output side, and a stator impeller 19.
A sprocket 23 is supported on a fixed shaft 22 via pins 0 and 21 and is fastened to the right side with bolts via a torsion damper, which will be described later, and is connected to the crankshaft sprocket 5 via a chain 24. Fixed axis 2
2 is fixed to the inner surface of the right case 9 with a plurality of bolts. A torque converter case 25 fixed to the pump impeller 17 with a plurality of bolts covers the turbine impeller 18 and has a cylindrical boss 26 in the center, and the boss 26 is supported by the crankcase 1 via a bearing 27. ing. The stator impeller 19 is connected to the fixed shaft 2 via a one-way clutch 28.
Supported by 2. A first shaft 30 is supported on the inner surface of the boss 26 via a needle bearing, the right end of the shaft 30 is spline-fitted to the turbine impeller 18, and a cylindrical shaft 31 is provided on the outer periphery. Both protrude into the clutch chamber 13, and within the clutch chamber 13, a clutch drum 32 is fixed to the first shaft 30, and an inner plate 33 is fixed to the cylindrical shaft 31. 34 and 35 are bearings.

A plurality of drive disks 3 in the clutch 14
The projection on the outer periphery of the driven disk 6 fits into the groove of the clutch drum 32 and is slidably supported only in the axial direction, and the projection on the inner periphery of the driven disk 37 fits into the groove of the inner plate 33 so that the driven disc 37 is supported in the axial direction. Both disks 36 and 37 are slidably supported by the piston 4.
0 and the stopper ring 41 alternately. 42 is a return spring, and 43 is an oil passage for supplying hydraulic pressure to the piston working chamber.

In the mission chamber 3, first and second speed drive gears 45 and 46 are fixed on the cylinder shaft 31, and a third speed drive gear 47 is rotatably supported. 48 is a dog clutch provided between the gears 46 and 47, and the annular groove 4 of the gear 47
The dog clutch 48 can be engaged by sliding the gear 47 to the left using a shift fork (not shown) fitted to the gear 9. 50 is the second shaft to which the output sprocket 10 is fixed, and the bearing 5
1 to the right side wall 3a of the crankcase 1, and is also supported by the left side wall 3b and the left case 12 via bearings 52, 53 on both sides of the output sprocket 10. 54 and 55 are the second shafts 50
The first and second driven gears are rotatable at the top.
56 is a third speed driven gear fixed on the shaft 50, 57 is a coupling sleeve spline-fitted on the shaft 50, and 58 and 59 are dog clutches formed between the coupling sleeve 57 and the gears 54 and 55. be. Coupling sleeve 57
It also has an annular groove 60, and is slidable left and right on the second shaft 50 by means of a shift fork fitted into the groove 60. When the coupling sleeve 57 moves to the left, the dog clutch 58 engages, and when the coupling sleeve 57 moves to the right, the dog clutch 59 engages.

Since the right side wall 3a of the mission chamber is moved toward the vehicle center O-O side (to the left in the figure), a cylindrical portion 6 opens toward the right from the peripheral edge of the right side wall 3a of the mission chamber.
5, and a right side case 9 that opens leftward is fastened to the right end of the case 9 with a plurality of bolts (not shown) to form a torque converter chamber 8. The illustrated crankcase 1 is divided into upper and lower halves, and a complete cylindrical portion 65 is formed when the upper and lower halves are joined. Torque converter 7
is generally stored within the cylindrical portion 65, and its outer peripheral edge is immersed in the lubricating oil at the inner bottom of the torque converter chamber 8. Of course, the bearings 27 and 51 may have a sealing structure, and the lubricating oil accumulated at the bottom of the torque converter chamber 8 may be returned to the mission chamber 3 by a pump. At the bottom of the torque converter chamber 8, the cylindrical portion 65 side and the right case 9 side communicate generally flatly, and the structure of the right case 9 is extremely simple.

The input (driven) sprocket 23 has two types of holes 67 and 68 extending in the circumferential direction as shown in FIG.
The boss 69 disposed in the hole 67 is provided with a bolt 7.
0 is fixed to the pump impeller 17 together with the retaining plate 71 (FIG. 2). The height of the boss 69 is set to be slightly higher than the thickness of the disc portion of the sprocket 23 where the hole 67 is provided.
Even after tightening bolt 70, sprocket 2
3 is rotatably supported with respect to the pump impeller 17 within a range where both circumferential ends (stopper portions) 72 of the elongated hole 67 contact the boss 69 . The damper spring 73 disposed in the hole 68 has both ends normally pressed against both ends of the hole 68 in the circumferential direction, and
A recess 74 with a half-moon cross section provided in the pump impeller 17
The retaining plate 71 is in contact with both end surfaces in the circumferential direction (the hatched portion) and both circumferential end surfaces (the hatched portion) of the window hole 75 provided in the retaining plate 71 . Therefore, engine torque is transferred from the chain 24 side to the sprocket 23.
When the rotational force of the sprocket 23 is transmitted from the hole 68 to the pump impeller 17 and the retaining plate 71 via the damper spring 73,
The damper spring 73 bends, absorbing torque fluctuations, and transmits the rotational force to the pump impeller 1.
7 can be transmitted. When the rotation angle of the sprocket 23 with respect to the pump impeller 17 increases,
The hole 67 of the sprocket 23 collides with the boss 69 (stopper) and further relative twisting is prevented. In this way, the spring 73 is connected to the pump impeller 1.
It plays the role of a torsional damper between sprocket 7 and sprocket 23. It is also possible to use a rubber type torsion damper.

In the illustrated state, the clutch 14 is off (disconnected) and the gear transmission 6 is in neutral. In this state, the engine is started, the dog clutch 58 is engaged by operating the change lever, and when hydraulic pressure is supplied to the clutch 14 and the clutch is connected, the engine is in first gear. While the engine is idling, the turbine impeller 18 of the torque converter 7 does not rotate due to the resistance of the rear wheels, and only the pump impeller 17 rotates. When the rotation of the engine increases, the rotation of the pump impeller 17 also increases, and the turbine impeller 18 is driven via the working fluid in the torque converter 7, and the output sprocket 10
starts rotating. That is, the torque transmitted to the turbine impeller 18 is transmitted to the first shaft 30 and the clutch drum 3.
2, disks 36, 37, inner plate 3
3. Cylindrical shaft 31, drive gear 45, driven gear 54, coupling sleeve 57, second shaft 5
0 and reaches the output sprocket 10. Since the output sprocket 10 is connected to the sprocket of the rear wheel through a chain (not shown), the rear wheel begins to rotate. When the clutch 14 is disengaged, the dog clutch 59 is engaged, and the clutch 14 is engaged, the second speed is obtained, and when the dog clutch 48 is similarly engaged, the third speed is obtained.

As explained above, according to the present invention, the following effects can be obtained.

(1) Sprockets 23 and 5 are installed on the right ends of the torque converter 7 and the crankshaft 4, and the chain 2
4, and the torque converter 7 is placed directly behind the right end of the crankshaft, so even though the torque converter 7, which is generally larger than the clutch, is placed in the conventional clutch mounting position, the position of the outer wall of the right case 9 is It is now possible to make it almost the same as the conventional one with a manual transmission, so there is no need to worry about deterioration of the ride feeling. Furthermore, the entire transmission can be made more compact.

By adopting a method of connecting the crankshaft 4 and the torque converter 7 with a chain 24, the torque converter 7 has a relatively large diameter.
can be separated from the crankshaft 4, so that even if the torque converter 7 is disposed directly behind the right end of the crankshaft as described above, there is no fear that the torque converter 7 and the crankshaft 4 will interfere with each other. In other words, by employing the chain 24, the torque converter 7 can be placed directly behind the crankshaft 4 and the above effects can be obtained.

(2) The clutch 14 is located on the left side of the transmission case left side wall 3b approximately directly behind the left end of the crankshaft.
By distributing the clutch 14 and the torque converter 7 to the left and right sides of the vehicle body, it is possible to balance the extension of the entire transmission in the left and right direction, and it is possible to improve the riding posture.

(3) The transmission chamber 3 at the rear inside the crankcase of a transverse engine with the crankshaft 4 arranged in the vehicle width direction.
The left and right side walls 3b, 3a of the vehicle body are moved toward the vehicle center O-O side, and a cylindrical portion 65 that opens toward the right is integrally provided around the right side wall 3a, and a cylindrical portion 65 that opens toward the left is provided at the tip of the cylindrical portion 65. Since the right side case 9 is tightened to form the torque converter chamber 8 with a generally flat bottom that communicates with the torque converter chamber 8, even though the torque converter 7 is placed directly behind the crankshaft 4, the torque can be transferred without disassembling the crankcase 1. Converter 7 can be serviced, in other words,
The torque converter 7 can be easily maintained by simply removing the right side case 9. Furthermore, the structure of the right case 9 is also extremely simple, which is effective in reducing costs.

As mentioned above, since the chain 24 is arranged at the right end of the torque converter 7 and the crankshaft 4, the chain 24 and damper (spring 73, etc.) can be easily maintained by simply removing the right side case 9. Furthermore, since the chain 24 is easy to attach and detach, maintenance of the torque converter 7 itself is also easy.

(4) The left case 12 was provided on the left side of the left side wall 3b of the transmission case, and the clutch 14 was placed inside the left case 12 and covered with the cover 15 from the left, so the clutch 14 was placed directly behind the crankshaft 4. Nevertheless, the clutch 14 can be serviced without disassembling the crankcase 1; in other words, the clutch 14 can be easily serviced simply by removing the cover 15.

(5) Connect the input part of the clutch 14 to the output shaft (first shaft 30) of the torque converter 7 extending in the width direction of the vehicle, connect the output part of the clutch 14 to the transmission in the transmission chamber 3, and connect the output shaft of the transmission (second shaft 50) to the left side wall 3 of the mission case.
Since the output sprocket 10 is attached to the protruding end thereof so as to protrude into the gap 11 between the left side case 12 and the clutch 14, the output sprocket 10
can be held at an optimal position close to the vehicle body center O-O.

(6) Since the transmission output shaft is supported on both sides of the output sprocket 10 by the transmission case left side wall 3b and the left side case 12 via the bearings 52 and 53, compared to the case where the transmission output shaft is supported in a cantilevered state, Support strength can be increased.

(7) A torsion damper using a spring 73 etc. is connected to the torque converter 7 and the input sprocket 23.
Since it is interposed between the chain 24 and the chain 24, engine torque fluctuations can be efficiently absorbed, and since the chain 24 is used, the buffering effect is further improved.

(8) Furthermore, if the clutch 14 is used for each gear,
Even when a 3-speed gear transmission 6 is placed inside the transmission chamber 3, the transmission is not bulky and does not affect the position of the output sprocket 10, compared to when one clutch is installed for each 1st gear. It becomes extremely cheap.

(9) A three-speed transmission with a torque converter can be obtained as shown in the drawings. In that case, 1st gear (low speed) is used for mountainous areas and engine braking, and 2nd gear is used for mountainous areas and engine braking.
The range of use of each speed range can be clearly defined, such as 3rd speed (medium speed) for normal city driving, 3rd speed (high speed) for highway driving, etc., so users can easily select each speed range without confusion. becomes available.

Note that the present invention is applicable not only to motorcycles but also to small (light) vehicles such as snowmobiles and power carriers.

[Brief explanation of the drawing]

Figure 1 is a partial horizontal cross-sectional view of a layout inappropriate for motorcycles, and Figure 2 is an engine to which the present invention is applied. Generally horizontal sectional view of the transmission unit, 3rd
The figure is a - sectional view of FIG. 1... Crank case, 3... Mission room,
3a...Right side wall, 4...Crankshaft, 5...Sprocket, 7...Torque converter, 9...Right side case, 23...Input sprocket, 24...
Chain, 65...tubular part, 73...damper spring, O-O...center of the vehicle body.

Claims (1)

[Scope of utility model registration request] The left and right side walls 3b and 3a of the transmission chamber 3 at the rear of the crankcase of a transverse engine with the crankshaft 4 arranged in the vehicle width direction are moved toward the vehicle center O-O side, and opened toward the right around the right side wall 3a. cylindrical part 6
5 is integrally provided, and a right side case 9 that opens leftward is fastened to the tip of the cylindrical portion 65 to form a torque converter chamber 8 whose bottom is generally flat and communicates with each other. The torque converter 7 is arranged in the converter chamber 8, and the input sprocket 23 attached to the right end of the torque converter 7 via a torsion damper is connected to the sprocket 5 attached to the right end of the crankshaft by a chain 24, and the input sprocket 23 is connected to the left side wall of the transmission case. A left case 12 is provided on the left side of the crankshaft 3b, and the clutch 1 is installed in the left case 12 approximately directly behind the left end of the crankshaft.
4 is placed and covered with a cover 15 from the left side, the input part of the clutch 14 is connected to the output shaft of the torque converter 7 extending in the width direction of the vehicle, and the output part of the clutch 14 is connected to the transmission in the transmission chamber 3. , the output shaft of the transmission is projected into the gap 11 between the left side wall 3b of the transmission case and the left case 12, and the output sprocket 10 is attached to the projected end, and the output shaft of the transmission is connected to the transmission case on both sides of the output sprocket 10. A transmission with a torque converter characterized in that it is supported by a left side wall 3b and the left side case 12 via bearings 52, 53.