JPH09287639A - Pulley structure of automatic v-belt transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight of a pulley structure by forming a moving pulley half body by using aluminum, to simplify the pulley structure, to reduce the size thereof, and simultaneously to ensure strength. SOLUTION: A automatic V-belt transmission comprises a fixed pulley half- body 61 pivotally supported in a rotary shaft; and a moving pulley half-body 62 positioned facing the fixed pulley half-body 61 and slidably pivotally supported at a fixed pulley cylinder body 61a to nip a V-belt 55 therebetween. In this case, the moving pulley half-body 62 forms a molded product through casting by using aluminum. A spring 80 made of a spring steel to energize the moving pulley half-body 62 to the fixed pulley half-body 61 aide is arranged in the vicinity of the outer periphery of a moving pulley cylinder shaft 62a. A spring guide 81 made of resin is arranged in a gap between the inner periphery of the spring 80 and the outer periphery of the moving pulley cylinder shaft 62a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulley structure for a V-belt automatic transmission used in motorcycles and the like.

[0002]

2. Description of the Related Art In a V-belt automatic transmission, an endless V-belt having a V-shaped cross section is bridged between a drive pulley and a driven pulley, and the effective radii of both pulleys are automatically adjusted according to the engine speed. Each pulley transmits and receives power, and each pulley has a V-belt sandwiched between a fixed pulley half and a movable pulley half that is slidable in the axial direction. The effective radius is changed according to the relative position in the axial direction.

Conventionally, a pulley is generally made of iron, and an example of such a driven pulley is shown in FIG. FIG. 12 shows a rear portion of a power unit 01 which integrally mounts an internal combustion engine at a front portion and a rear wheel which is axially supported at a rear portion, and a reduction gear input shaft of a reduction gear 02 having a rear axle 04 as an output shaft. An inner sleeve 06 is rotatably supported on 03, and an outer sleeve 07 is slidably supported on the outer circumference of the inner sleeve 06 with respect to the inner sleeve 06.

A driven pulley 08 is provided at the right ends of the inner sleeve 06 and the outer sleeve 07.
Consists of a fixed pulley half body 09 fitted to the right end of the inner sleeve 06 and a movable pulley half body 010 fitted to the right end of the outer sleeve 07. The movable pulley half body 010 faces and the V belt 011 is sandwiched between them.

A clutch 012 is provided at the left end of the speed reducer input shaft 03 and the sleeve 06, and the outer periphery of the drive plate 013 fitted to the left end of the sleeve 06 is connected to the left end of the speed reducer input shaft 03. The fitted clutch outer 014 covers. A spring 015 provided around the outer sleeve 07 is interposed between the drive plate 013 and the movable pulley half 010, and the spring 015 urges the movable pulley half 010 to the fixed pulley half 09 side. The V-belt 011 is clamped.

Outer circumference of outer sleeve 07 and spring 015
Between the inner circumference of the drive pulley half 010 side spring guide 016 and the drive plate 013 side spring guide.
017 is partially wrapped.

When the movable pulley half body 010 is made of iron, it is integrally fixed to a separate outer sleeve 07, and a lubricating oil passage 018 is provided for smooth sliding of the outer sleeve 07 with respect to the inner sleeve 06, and Oil seals 019, etc. are required at both ends of the outer sleeve 07 to prevent leakage of lubricating oil.

Since the driven pulley 08 has a large number of parts and its structure is complicated as described above, an example in which the driven pulley is made of cast aluminum is already proposed.
An example described in Japanese Patent No. 224345 is shown in FIG.

Fixed pulley half 021 of the driven pulley 020
Is cast by aluminum die casting integrally with the cylindrical inner sleeve part 021a, and the reduction gear input shaft 030
It is rotatably supported by. On the other hand, the movable pulley half body 022 is also integrally molded with the outer sleeve portion 022a by aluminum die casting, and the outer sleeve portion 022a is slidably supported on the outer periphery of the inner sleeve portion 021a.

A spring 025 provided around the outer sleeve portion 022a is interposed between the drive plate 026 and the movable pulley half 022 of the clutch 025 fitted to the left end of the inner sleeve portion 021a, and the movable pulley half 022 is inserted. The half body 022 is biased toward the fixed pulley half body 021 side to sandwich the V belt 023. As described above, by making the driven pulley 020 a cast product made of aluminum, the number of parts can be reduced, the structure can be simplified, and the cost can be reduced.

[0011]

[Problems to be Solved by the Invention] However, spring 025
Is made of spring steel, one end of which abuts on a drive pulley 026 integrated with a fixed pulley half 021 and the other end of which abuts on a movable pulley half 022 made of aluminum.

The movable pulley half 022 is a fixed pulley half 02.
It is allowed to slide in the axial direction as well as in the circumferential direction with respect to 1, and there is relative rotation with the fixed pulley half 021. Therefore, the end of the spring 025 made of steel and the movable part made of aluminum can be moved. Movable pulley half 02 by sliding contact with pulley half 022
Wear is likely to occur at the contact part of 2.

Since the outer sleeve portion 022a of the movable pulley half 022 may also wear due to friction between the outer sleeve portion 022a and the spring 025, it is possible to increase the distance between the outer sleeve portion 022a and the spring 025. If the interval is increased without increasing the size of the pulley structure, the outer sleeve portion 022a becomes thin and the strength is reduced.

Therefore, as in the example shown in FIG. 12, the spring guide is connected to the outer sleeve portion 022a and the spring 025.
It is conceivable to arrange it between the outer spring part 02 and the iron spring guide 02.
The friction between the 2a causes a problem of wear of the outer sleeve portion 022a. Therefore, if an attempt is made to increase the distance between the outer sleeve portion 022a and the spring guide, the pulley structure becomes large, or the outer sleeve portion 022a becomes thin, and sufficient strength cannot be obtained.

The present invention has been made in view of the above points, and the object thereof is to make the movable pulley half body made of aluminum to make the pulley structure lightweight and simple and downsized, while at the same time ensuring sufficient strength. The point is to provide a V-belt automatic transmission pulley structure that can be used.

[0016]

In order to achieve the above object, the present invention has a fixed pulley half body axially supported by a rotary shaft and a V belt sandwiched between the fixed pulley half body and the fixed pulley half body. In order to do so, a V-belt automatic transmission including a movable pulley half body slidably supported by a fixed pulley cylindrical shaft,
The movable pulley half is a molded product such as cast from aluminum, and a spring made of spring steel for urging the movable pulley half toward the fixed pulley half is provided in the vicinity of the outer periphery of the movable pulley cylinder shaft, A pulley structure for a V-belt automatic transmission is provided in which a resin spring guide is provided in the gap between the inner circumference of the spring and the outer circumference of the movable pulley cylindrical shaft.

Since the movable pulley half body and the movable pulley cylindrical shaft are molded articles made of aluminum, the pulley structure can be simplified while reducing the weight and the number of parts. Since the spring is provided close to the outer circumference of the movable pulley cylinder shaft, and the resin spring guide is provided in the gap between the inner circumference of the spring and the outer circumference of the movable pulley cylinder shaft, the space between the spring and the movable pulley cylinder shaft can be reduced. Even if the pulley structure is miniaturized, the resin spring guide can prevent the aluminum movable pulley cylindrical shaft from being worn and maintain sufficient strength.

Further, one end of the spring abuts on a flange formed at an end portion of the spring guide, and the other end of the spring abuts on a spring seat made of iron interposed between the movable pulley half body. The pulley structure of the V-belt automatic transmission according to claim 1 in contact with the pulley structure.

Since the end portion of the spring made of spring steel abuts on the spring seat made of iron, it is easy to slip between them and the spring is easily moved between the spring seats when the movable pulley half is rotated relative to the fixed pulley half. It is possible to always obtain good gear shifting characteristics without causing slippage, causing no slippage in other parts and causing wear.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment according to the present invention will be described with reference to FIGS. Figure 1 shows the book V
1 is an overall side view of a scooter type motorcycle 1 to which a belt automatic transmission is applied.

The vehicle body front portion 2 and the vehicle body rear portion 3 are connected to each other via a low floor portion 4, and the vehicle body frame 5 extends downward from the vehicle body front portion 2 and then horizontally extends the floor portion 4 rearward. Rises from the rear end of the floor portion, further tilts rearward obliquely upward and extends to the rear end.

At the front part of the body frame 5, a steering handle 6 is provided at the upper end, and a front fork 8 for pivotally supporting a front wheel 7 is pivotally supported at the lower end. At the rising portion of the vehicle body frame 5, the lower front end of a swing type power unit 20 having a rear wheel 9 pivotally supported at the rear end is pivotally supported up and down via a link 10, and the rear upper surface of the power unit 20 is supported. A rear cushion 11 is interposed between the vehicle body frame 5 and an upper portion thereof.

The front part 2 of the vehicle body is covered with a leg shield 15,
The floor portion 4 is provided with a step floor 16 and the rear portion 3 of the vehicle body.
Is covered with a body cover 17, and a seat 18 is provided above the body cover 17.

The power unit 20 includes a single-cylinder two-cycle internal combustion engine 21 arranged at the front, a gear reducer 22 provided at the rear, and a main V arranged between the internal combustion engine 21 and the gear reducer 22. The belt automatic transmission 23 is unitized and housed in a unit case 25.

The structure of the power unit 20 is shown in FIG. The unit case 25 includes a V-belt automatic transmission 23 and a gear reducer.
A long left case 26 that houses 22 and also serves as the left half of the crankcase of the internal combustion engine 21, and a right case that is joined to the front of the left case 26 to form the right half of the crankcase. 27, a transmission case cover 28 that covers the left side of the left side case 26, and a gear case 29 that covers the gear reducer 22 from the left side.

In the crankcase formed by the left case 26 and the right case 27, a crankshaft 31 is rotatably supported by a pair of left and right main bearings 30, 30.
A cylinder block 21a and a cylinder head 21b are joined from the same crankcase 21 and stand upright with a slight rearward inclination. The piston 32, which slides in the cylinder block 21 a, is connected to the crankshaft 31 via a connecting rod 33.

An AC generator 34 and a cooling fan 35 are provided at the right end of the crankshaft 31, and the internal combustion engine 21, AC
Engine cover around the generator 34 and cooling fan 35
36 covers.

A drive pulley 40 of the V-belt automatic transmission 23 is provided at the left end of the crankshaft 31, and the drive pulley 40 includes a fixed pulley half body 41 and a crankshaft 31 fixed to the left end of the crankshaft 31. The movable pulley half 42, which is slidably supported in the axial direction, faces each other, and the centrifugal weight 44 is radiused between the movable pulley half 42 and the ramp plate 43 fixed to the crankshaft 31. It is housed so that it can move in any direction.

By the movement of the centrifugal weight 44 in the centrifugal direction, the movable pulley half body 42 comes closer to the fixed pulley half body 41, and the effective radius of the V belt 55 sandwiched between the pulley half bodies 41 and 42 is set. Can be large.

On the other hand, the gear reducer 22 disposed in the rear portion of the left side case 26 and the gear case 29 is, as shown in FIG. 3, intermediate between the reducer input shaft 45 and the rear axle 47 which is the reducer output shaft. axis
An input gear 48 provided with 46 and fitted to the speed reducer input shaft 45
A large-diameter intermediate gear 49 fitted to the intermediate shaft 46 meshes, and a small-diameter intermediate gear 50 fitted to the same intermediate shaft 46 meshes with the output gear 51 fitted to the rear axle 47 to reduce the speed. The mechanism is configured.

As shown in FIG. 3, a driven pulley 60 and a clutch 70 are provided on the left half of the gear reducer 22 which penetrates the gear case 29 of the reducer input shaft 45. Driven pulley 60
Is composed of a pair of fixed pulley half body 61 and movable pulley half body 62 which are made of aluminum and face each other.

As shown in FIG. 6, fixed pulley half 61
The inner peripheral portion of the main body extends in the axial direction to form a cylindrical inner sleeve portion 61a, the end portion of the inner sleeve portion 61a is slightly reduced in diameter, and the mounting portion 61b is engraved with serrations on the outer periphery. The fixed pulley half body 61 is integrally cast from the main body to the mounting portion 61b by aluminum die casting.

On the other hand, the movable pulley half 62 is shown in FIGS.
As shown in the drawing, the inner peripheral portion of the main body extends in the axial direction to form a cylindrical outer sleeve portion 62a having an inner diameter slightly larger than the inner sleeve portion 61a of the fixed pulley half body 61. Protrusions 62b each having an arcuate cross section are formed so as to project in the axial direction at three positions at equal intervals in the circumferential direction on the edge, and the tip end of the protrusion 62b is bent clockwise in FIG. 4 to form the movable side cam portion 62c. Has been formed. The movable side cam portion 62c is
It forms an outward cam surface 62co and an inward cam surface 62ci whose front and rear end surfaces in the circumferential direction are inclined.

In this embodiment, the three movable cam portions 62c are provided with triangular bulging portions in opposite rotational directions to form the inward cam surface 62ci, but the inward cam surface 62ci is fixed as described later. Since a relative load with respect to the side cam portion 75 is restricted and a large load is not applied, only one of the three movable side cam portions 62c is provided with a bulging portion to form an inward cam surface. Is enough. An annular groove 62d is formed on the outer peripheral portion of the base of the outer sleeve portion 62a in the main body of the movable pulley half 62. Movable pulley half 62
Is integrally cast by aluminum die casting from the main body to the movable side cam portion 62c.

In the fixed pulley half 61 of the driven pulley 60 as described above, as shown in FIG. 3, the inner sleeve portion 61a is passed through the speed reducer input shaft 45 to rotate via the needle bearing 63 and the ball bearing 64. The movable pulley half 62 is rotatably supported, and the outer sleeve 62a is slidably supported on the outer circumference of the inner sleeve 61a of the fixed pulley half 61.
Is supported. The movable pulley half 62 is a fixed pulley half 61.
On the other hand, the main bodies are opposed to each other, and are supported so as to be capable of sliding in the axial direction and being rotatable in the circumferential direction.

A clutch 70 is provided at the left end of the damper input shaft 45 and the left end mounting portion 61b of the inner sleeve portion 61a of the fixed pulley half body 61. The clutch outer 71 having a flat bottomed cylindrical shape of the clutch 70 has a center hole of a bottom wall 71a thereof fitted into a left end screw portion of the speed reducer input shaft 45 via a collar 73 and screwed and tightened by a nut 74. The peripheral side wall 71b is opened to the right.

Inside the clutch outer 71, the left end mounting portion 61b of the inner sleeve portion 61a of the fixed pulley half body 61.
A drive plate 72, which is a clutch inner, is attached by serration fitting.

As shown in FIGS. 8 to 10, the drive plate 72 has a flat cylindrical serration fitting portion 72a formed on the inner peripheral edge thereof, and the core portion 72b is radially formed from the outer peripheral surface of the serration fitting portion 72a. Has a shape in which the outer peripheral plate portion 72c is connected with a slight step formed by the concentric portion 72b.

Pins at three locations at equal intervals on the outer peripheral plate portion 72c
73 is planted, and the clutch shoe 74 is pivotally supported on the pin 73. The core portion 72b is integrally molded with a fixed side cam portion 75 made of resin having self-lubricating properties and provided at three equal intervals.

A gap 72 is formed between the fixed side cam portions 75, 75.
d is formed, and the three movable side cam portions 62c of the movable pulley half body 62 face the three gaps 72d so that the resin fixed side cam portion 75 and the movable side cam portion 62c mesh with each other. Engage. The fixed cam portion 75 made of resin is fixed to the distorted core portion 72b as shown in FIG. 10, has a substantially trapezoidal cross section, and is an inward cam surface that is a plane with inclined front and rear end faces in the circumferential direction. 75i and curved outward cam surface 75 that is a curved surface
forming o.

The drive plate 72 is disposed in the clutch outer 71, and the clutch shoe 74 pivotally supported by the pin 73 swings radially outward against the clutch spring 76 by the centrifugal force. A friction member 74a provided on the outer periphery of the outer peripheral surface of the clutch outer 71 abuts and engages with the inner peripheral surface of the peripheral side wall 71b of the clutch outer 71.

The drive plate 72 is a fixed pulley half 61.
The drive plate 72 rotates integrally with the fixed pulley half body 61 because it is serration-fitted and integrally attached to the left end mounting portion 61b of the inner sleeve 61a.

As shown in FIG. 3, this drive plate 72
The movable pulley half 62, which is slidably supported between the stationary pulley half 61 and the main body of the fixed pulley half 61, is provided with a spring steel spring 80 around the outer sleeve portion 62a. The reference numeral 80 is interposed between the drive plate 72 and the movable pulley half body 62 to urge the movable pulley half body 62 in a direction to approach the fixed pulley half body 61.

A resin spring guide 81 is provided in the gap between the inner circumference of the spring 80 and the outer circumference of the outer sleeve portion 62a.
Is interposed. The spring guide 81 has a cylindrical shape as shown in FIG. 7, and has a flange 81a formed at one end. The inner diameter of the spring guide 81 is slightly larger than the outer diameter of the outer sleeve portion 62a. The diameter has been slightly expanded.

The spring guide 81 is attached to the outer sleeve part.
When the drive plate 72 is arranged on the outer circumference of the 62a and is attached to the left end mounting portion 61b of the inner sleeve 61a, the fixed cam portion 75 made of resin is fitted into the enlarged inner diameter portion of the spring guide 81 to secure the spring guide 81. The flange 81a of the spring guide 81 abuts on the stepped portion on the inner circumference of the outer peripheral plate portion 72c of the drive plate 72.

On the other hand, the outer sleeve portion of the movable pulley half 62.
An annular groove 62d is provided on the outer periphery of the base of 62a,
A spring seat 82, which is an iron-made annular iron plate, is fitted,
Both ends of the spring seat 82 and the flange 81a of the spring guide 81 are in contact with each other, and the spring 80 is interposed therebetween.

In this way, the rear portion of the V belt 55 having the front portion wound around the drive pulley 40 is sandwiched between the movable pulley half 62 and the fixed pulley half 61, which are biased by the spring 80,
The moving pulley half 62 is fixed by the spring 80.
The V belt 55 is biased toward the 61 side and acts to increase the effective radius of the wound V belt 55, so that the V belt 55 can be tensioned.

The outer sleeve 62 of the movable pulley half 62
The left side movable cam portion 62c of a faces the gap 72d of the drive plate 72 that rotates integrally with the fixed pulley half body 61, and engages with the resin fixed side cam portion 75 so as to mesh therewith. FIG. 11 is an expanded view of the engagement state of the movable side cam portion 62c and the three fixed side cam portions 75.

The inward cam surface 75i and the outward cam surface 75o of the fixed side cam portion 75 correspond to the inward cam surface 62ci of the movable side cam portion 62c.
And facing outward cam surface 62co with a slight clearance. Therefore, the play in the rotational direction of the movable cam portion 62c with respect to the fixed cam portion 75 is small.

The V-belt automatic transmission 23 has the above structure, and its operation will be described below. Internal combustion engine
When the rotational speed of 21 is low, the centrifugal weight 44 moving along the ramp plate 43 on the drive pulley 40 side is on the center side and the movable pulley half 42 is fixed pulley half 41 as shown by the solid line in FIG. The effective radius of winding the V-belt 55 is small, so that the movable pulley half 62 is biased by the spring 80 on the side of the driven pulley 60 to approach the fixed pulley half 61, and the winding of the V-belt 55 is effective. The radius is maintained large and power is transmitted at a large reduction ratio.

As the engine speed increases, the centrifugal weight 44 moves in the centrifugal direction, as shown by the chain double-dashed line in FIG. 2, and the movable pulley half 42 on the drive pulley 40 side approaches the fixed pulley half 41. The effective radius of winding the V-belt 55 becomes large, so that the movable pulley half 62 separates from the fixed pulley half 61 against the spring 80 on the driven pulley 60 side, and the effective radius of winding the V-belt 55 becomes small. Then, the reduction ratio gradually decreases, and at this time, the clutch 70 is also in the engaged state and the rotational speed of the rear wheel 9 is increased.

When the engine rotation speed increases, the movable pulley half 62 moves in the direction away from the fixed pulley half 61 as described above. Therefore, the movable side cam portion 62c integral with the movable pulley half 62 is As indicated by a two-dot chain line in FIG. 11, it enters into the space 72d between the fixed side cam portions 75.

When the tension of the V-belt 55 suddenly increases due to sudden acceleration or the like, slippage occurs between the fixed pulley half 61 connected to the rear wheel 9 and receiving a large load, and the V-belt 55. Since the load of the rear wheel 9 does not act directly on the movable pulley half 62 that can rotate relative to the fixed pulley half 61, the movable pulley half 62 tries to rotate together with the V-belt 55.

Therefore, the movable pulley half body 62 causes relative rotation with respect to the fixed pulley half body 61. Therefore, the movable side cam portion 62c integral with the movable pulley half body 62 is fixed to the fixed pulley half body.
The fixed cam portion 75 fixed to the drive plate 72 integral with 61 tries to rotate ahead of the fixed cam portion 75. As shown in FIG.
Move relatively in the direction.

Then, the outward cam surface 62 of the movable side cam portion 62c.
co contacts the outward cam surface 75o of the fixed side cam portion 75,
The movable side cam portion 62c receives a force in the direction of the arrow B due to the reaction, thereby bringing the movable pulley half body 62 closer to the fixed pulley half body 61 and increasing the clamping pressure of the V belt 55 to prevent the V belt 55 from slipping. become.

As described above, between the fixed pulley half body 61 and the movable pulley half body 62, in addition to the relative movement in the axial direction, the relative rotation in the rotation direction occurs. The spring 80 provided near the outer circumference of the outer sleeve portion 62a is prevented from interfering with the outer sleeve portion 62a by the resin spring guide 81, and the aluminum outer sleeve portion 62a is made of the steel spring 80. There is no risk of wear due to interference with.

Since the spring 80 is guided by the outer circumference of the resin spring guide 81, even if the spring guide 81 interferes with the outer sleeve portion 62a, the outer sleeve portion 62a is much less worn than the iron spring guide. . Therefore, the spring guide 81 can be brought close to the outer sleeve portion 62a, and the outer sleeve portion 62a
The pulley structure can be downsized without reducing the wall thickness of 62a and lowering the strength.

Since the fixed pulley half body 61 and the movable pulley half body 62 are cast products made of aluminum integrally with the inner sleeve portion 61a and the outer sleeve portion 62a, respectively,
The number of parts is small, the pulley structure is simplified, and the weight and cost are reduced.

Further, one end of the steel spring 80 is pressed against the flange 81a of the resin spring guide 81, and the other end is pressed against the iron spring seat 82 provided on the movable pulley half 62 side. The slippage between the spring 80 and the spring seat 82 is such that the spring 80 slips exclusively between the spring seat 82 and the relative rotation between the fixed pulley half 61 and the movable pulley half 62. It does not cause slippage with other resin spring guides 81, and there is little fear of wear. Thus the spring
80 always operates normally, and the shifting characteristics of the V-belt automatic transmission 23 are maintained in good condition.

[Brief description of drawings]

FIG. 1 is an overall side view of a scooter type motorcycle to which a V-belt automatic transmission according to an embodiment of the present invention is applied.

FIG. 2 is a cross-sectional view of the power unit taken along the line II-II in FIG.

FIG. 3 is a cross-sectional view of the main part of the rear part of the power unit.

FIG. 4 is a side view of a movable pulley half.

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is a sectional view of a fixed pulley half body.

FIG. 7 is a sectional view of a spring guide.

FIG. 8 is a side view of the drive plate.

FIG. 9 is a sectional view taken along line IX-IX in FIG. 8;

10 is a cross-sectional view taken along the line XX in FIG.

FIG. 11 is a development view showing an engagement state between a fixed side cam portion and a movable side cam portion.

FIG. 12 is a sectional view showing a conventional pulley structure.

FIG. 13 is a cross-sectional view showing another conventional pulley structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Scooter type motorcycle, 2 ... Front part of vehicle body, 3 ... Rear part of vehicle body, 4 ... Floor, 5 ... Body frame, 6 ... Steering handle, 7 ... Front wheel, 8 ... Front fork, 9 ... Rear wheel, 10 ...
Link, 11 ... rear cushion, 15 ... leg shield, 16
… Step floor, 17… body cover, 18… seat, 20
... power unit, 21 ... internal combustion engine, 22 ... gear reducer, 23
... V-belt automatic transmission, 25 ... Unit case, 26 ... Left case, 27 ... Right case, 28 ... Transmission case cover, 29 ...
Gear case, 30… Main bearing, 31… Crank shaft, 32…
Piston, 33 connecting rod, 34 AC generator, 35 cooling fan, 36 engine cover, 40 drive pulley, 41 fixed pulley half, 42 movable pulley half,
43 ... Ramp plate, 44 ... Centrifugal weight, 45 ... Reducer input shaft, 46 ... Intermediate shaft, 47 ... Rear axle, 48 ... Input gear, 49 ... Intermediate gear, 50 ... Intermediate gear, 51 ... Output gear, 55 ... V belt,
60 ... driven pulley, 61 ... fixed pulley half, 62 ... movable pulley half, 63 ... needle bearing, 64 ... ball bearing, 70 ... clutch, 71 ... clutch outer, 72 ... drive plate, 73 ... collar, 74 ... nut , 75 ... Fixed side cam part, 76 ... Clutch spring, 80 ... Spring, 81 ... Spring guide, 82 ... Spring seat.

Claims (2)

[Claims] 1. A fixed pulley half body axially supported by a rotary shaft,
A V-belt automatic transmission comprising a fixed pulley half body and a movable pulley half body slidably supported by a fixed pulley cylindrical shaft for sandwiching the V belt, wherein the movable pulley half body is made of aluminum. A molded product by casting or the like, and a spring made of spring steel for urging the movable pulley half toward the fixed pulley half is provided close to the outer circumference of the movable pulley cylindrical shaft, and the inner circumference of the spring and the movable A pulley structure for a V-belt automatic transmission, characterized in that a resin spring guide is provided in a gap between the outer circumference of the pulley cylindrical shaft. 2. One end of the spring is brought into contact with a flange formed at an end of the spring guide, and the other end of the spring is made of an iron spring seat interposed between the spring half and the movable pulley half body. The pulley structure of the V-belt automatic transmission according to claim 1, wherein the pulley structure is in contact with the pulley.