JP4352055B2 - Drive belt pulley for V-belt transmission - Google Patents

Description

  The present invention provides a V-belt transmission that is well ventilated to the weight roller in the driving pulley to prevent high temperature and to maintain the smoothness of the operation of the weight roller over a long period of time. The present invention relates to a drive-side pulley of a V-belt transmission that can perform the above.

  In a continuously variable transmission, there is a continuously variable transmission that transmits an endless V-belt with a continuously variable speed by transmitting an endless V-belt between a driving pulley and a driven pulley whose pulley width is variable by rotation. To do. This type of driving pulley and driven pulley are each composed of a movable pulley half and a fixed pulley half.

  In the V-belt transmission, the drive pulley is composed of a movable pulley half and a fixed pulley half, and a ramp plate is fixed to the crankshaft so as to rotate integrally with the back side of the movable pulley half. A roller chamber in which the weight roller can move while rotating along the diameter direction of the movable pulley half is formed substantially radially on the back side of the movable pulley half. The weight roller is disposed between the roller chamber of the movable pulley half and the ramp plate.

In this type of V-belt type automatic transmission, a cylindrical outer peripheral wall is formed at the outermost peripheral portion as disclosed in Patent Document 1 on the back side of the movable pulley half of the driving pulley. The axial length of the outer peripheral wall is a slider length that guides the movement of the movable pulley half in the axial direction. On the inner side of the outer peripheral wall, a centrifugal groove is formed on the back surface of the movable pulley half to house the centrifugal roller. A ramp plate is provided so as to cover the groove so as to approach the back side of the movable pulley half in the centrifugal direction. The outer peripheral edge of the lamp plate is located inside the outer peripheral wall of the movable pulley half so as to close the groove.
Reality 2-44121

  When the outline of the structure disclosed in Patent Document 1 is shown in FIG. 6, a cylindrical outer peripheral wall a is formed on the back side of the movable pulley half, and the outer peripheral wall a of the movable pulley half and the axial direction A substantially closed gap is formed by the lamp plate b fixed to the lamp plate b. Then, the frictional heat generated by the operation of the V belt and the pulley is transmitted to the gap surrounded by the outer peripheral wall a of the movable pulley half and the lamp plate b, and the heat is accumulated in the gap, so that the centrifugal roller c The temperature of the groove inside the movable pulley half accommodated easily rises. When the temperature in the groove rises, the resin layer provided on the outer peripheral surface of the centrifugal roller c and the like to improve the slidability and sound may deteriorate or wear.

  For this reason, the diameter of the centrifugal roller may change, and the desired gear ratio may not be achieved. In addition, the temperature of the movable pulley surface of the movable pulley half also increases, and the thermal deterioration of the V-belt is likely to proceed, which may reduce the durability and life. The problem (technical problem or object) to be solved by the present invention is that the weight roller mounting portion in the movable pulley half of the driving pulley is well ventilated to prevent the portion from becoming hot and the weight It is to realize the smooth operability of the roller.

  In view of the above, the inventor has intensively and intensively studied to solve the above-mentioned problems. As a result, the invention of claim 1 is changed to a driving pulley comprising a movable pulley half, a fixed pulley half, a weight roller, and a roller support plate. And the outer peripheral edge of the back side of the movable pulley half is formed in a ring-shaped flat surface so as to be orthogonal to the axial direction, and the roller chambers in which the weight rollers are housed are formed substantially radially, A roller pressing wall portion is formed in an axial direction from the outer peripheral edge on the back side of the movable pulley half at the roller chamber portion, and a slider sliding boss is formed between the roller pressing wall portions. The height of the roller pressing wall portion is formed to be lower than the height of the slider sliding boss with reference to the outer peripheral edge on the back side of the pulley half, and the roller pressing wall portion and the slider sliding boss are: Separated on the outer edge The above-mentioned problem is solved by forming a pulley on the drive side of the V-belt transmission that is formed between the roller pressing wall portion and the slider sliding boss at the outer peripheral edge. did.

  According to a second aspect of the present invention, in the first aspect of the invention, the height of the roller pressing wall portion is a driving pulley of the V-belt transmission in which the height of the slider sliding boss is smaller than approximately half of the height of the slider sliding boss. Solved the above problem. The invention of claim 3 is the drive pulley of the V-belt transmission in which the height of the roller pressing wall portion in claim 1 is made larger than about half of the height of the slider sliding boss. Solved the above problem.

  According to the first aspect of the present invention, it is possible to satisfactorily introduce the outside air to the back side of the movable pulley half, and to suppress the temperature rise in the roller chamber and to cover the surface of the weight roller disposed in the roller chamber. The deterioration of the synthetic resin portion and the progress of wear can be reduced, and the slidability can be improved. Further, by introducing the outside air, the change in the outer diameter can be reduced by cooling the weight roller, and the stability of the operation such as the sliding property of the weight roller can be improved. Furthermore, belt durability and life can be improved by improving the cooling performance by increasing outside air introduction on the back side of the movable pulley half. Furthermore, the opening of the movable pulley half and the roller support plate can be widened, and the cooling performance can be improved.

According to the invention of claim 2, by reducing the roller pressing wall portion, the opening area can be further expanded, the introduction of outside air can be increased, and the cooling performance can be improved. According to the invention of claim 3, the roller pressing wall portion can further prevent the weight roller from falling off.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1A, the drive-side transmission pulley mainly includes a movable pulley half A, a fixed pulley half 8, a weight roller 9, and a roller support plate 7. The movable pulley half A and the fixed pulley half 8 face each other to constitute a set of pulley bodies. The movable pulley half A is formed of a movable pulley face 1 and a movable boss portion 2 having a substantially flat conical shape.

  The configuration of the fixed pulley half 8 is substantially the same as that of the movable pulley half A, and includes a fixed pulley face 8a and a fixed boss 8b. The movable pulley face 1 and the fixed pulley face 8a face each other, the movable pulley half A moves along the axial direction, and the fixed pulley half 8 and the movable pulley half A come close to each other. By separating them, the surface sides of both pulley faces come into contact with the V-belt, and the distance is variable.

As shown in FIG. 1C, the movable pulley face 1 has a substantially flat conical shape, and the convex side surface of the flat conical shape is the surface side 1a of the movable pulley face 1 (movable pulley half A). Yes, on the contact side with the V-belt. Further, the flat conical concave side surface is the back side 1b of the movable pulley face 1 (movable pulley half A). Further, the outer peripheral edge 1b ₁ on the back surface side 1b is formed as a ring-shaped flat surface so as to be orthogonal to the axial direction (see FIGS. 1B and 2A).

  The movable pulley face 1 and the fixed pulley face 8a face each other to form a substantially V-shaped cross section, and the belt can be wound while holding the V belt. The movable boss portion 2 has a cylindrical shape and is slidable with the fixed boss portion 8 b of the fixed pulley half 8. The engine drive shaft 10 is inserted through the fixed boss portion 8 b, and the fixed pulley half 8 rotates with the drive shaft 10.

  On the back side 1b of the movable pulley face 1, a plurality of roller chambers 3, 3,... Are formed radially from the outer peripheral side surface with the movable boss portion 2 as the center (see FIG. 1B). A weight roller 9 described later is slidably disposed in the roller chamber 3. Each roller chamber 3 includes a roller sliding surface 3a and a guide side wall 3b, and the roller sliding surface 3a is formed along a radial direction (diameter direction).

  And the guide side walls 3b and 3b are formed in the substantially right-angle shape at the width direction both sides of this roller sliding surface 3a. The roller sliding surface 3a is a surface on which the weight roller 9 rolls. Both the guide side walls 3b and 3b serve to guide both ends of the weight roller 9 in the axial direction so that the weight roller 9 is always properly positioned on the roller sliding surface 3a. Further, the roller sliding surface 3 a is formed as an inclined surface along the shape of the back surface side 1 b of the movable pulley face 1.

  Specifically, the roller sliding surface 3 a is a surface formed so as to become gradually shallower from the position of the movable boss portion 2 toward the outer periphery of the movable pulley face 1. That is, the weight roller 9 disposed in the roller chamber 3 moves on the roller sliding surface 3a from the movable boss portion 2 side toward the outer periphery of the movable pulley face 1, and moves the back side 1b of the movable pulley face 1 in the axial direction. [See FIGS. 4A and 4B].

Further, a roller pressing wall portion 5 is formed at _one location of the outer peripheral edge 1b of the movable pulley face 1 where the roller chamber 3 is formed. The roller pressing wall 5 is continuous with the roller sliding surface 3a, and prevents the weight roller 9 accommodated in the roller chamber 3 from dropping out of the movable pulley half A from the roller chamber 3. It plays a role. The roller pressing wall portion 5 is a portion formed in a protruding wall shape outward in the axial direction from the back side 1b of the movable pulley half A. Further, the size of the roller pressing wall portion 5 in the width direction is formed to have a width substantially equal to the width direction dimension of the roller chamber 3.

  In the plurality of radially formed roller chambers 3, 3,..., A slider sliding boss is provided between the adjacent roller chambers 3, 3, as shown in FIGS. 1 (B) and 2 (A). 6 is formed. The slider sliding boss 6 serves as a guide for the operation of approaching and separating from a roller support plate 7 described later. The slider sliding boss 6 has a length corresponding to the range in which the movable pulley half A moves in the axial direction (see FIG. 1A).

As shown in FIG. 1C, the relationship between the height h ₁ of the roller pressing wall 5 and the height h ₂ of the slider sliding boss 6 is the back side of the movable pulley half A. The height h ₁ of the roller pressing wall portion 5 is formed to be lower than the height h ₂ of the slider sliding boss 6 with the flat surface at the outer peripheral edge 1b ₁ of 1b as a reference surface. That is, h ₁ <h ₂ .

In the present invention, the height h ₁ of the roller pressing wall portion 5 is approximately half the height h ₂ of the slider sliding boss 6. Furthermore, the height h ₁ of the roller pressing wall portion 5 may be formed to be smaller than substantially half of the height h ₂ of the slider sliding boss 6. Particularly, in the slider approximately embodiment be less than half the height h ₂ of the sliding bosses 6, roller pressing wall portion 5, the weight roller 9 is the height of the minimum required to be prevented from falling off by centrifugal force (See FIG. 5).

In this embodiment, the amount of outside air introduced into the roller chamber 3 and the weight roller 9 can be increased. The height h ₁ of the roller pressing wall portion 5 is formed to be larger than substantially half of the height h ₂ of the slider sliding boss 6, and there is an embodiment. In this embodiment, the weight roller 9 is securely held in the roller chamber 3.

As described above, the roller pressing wall portion 5 and the slider sliding boss 6 are formed on the outer peripheral edge 1b ₁ so as to be separated from each other. That is, the back moldings projecting in the axial direction in the outer peripheral edge 1b ₁ side 1b and size of the circumferential direction of the movable pulley half body A are those that are required minimized. In other words, a molded product other than the roller pressing wall portion 5 and the slider sliding boss 6 is not present on the outer peripheral edge 1b ₁ on the back side 1b of the movable pulley half A (FIG. 2). reference).

  Therefore, the outside air introduction area on the back side 1b of the movable pulley half A can be set large. Thereby, compared to the outer peripheral wall a (see FIG. 6) provided in a cylindrical shape on the back side of the conventional movable pulley half, the back side 1b of the movable pulley half A in the present invention is open, The contact area with the outside air can be remarkably increased, the release of frictional heat from the weight roller 9 can be improved, and the weight roller 9 that has been heated to high temperature is also cooled.

  Even when the weight roller 9 is positioned on the outermost peripheral side by centrifugal force due to the rotational speed of the movable pulley half A, the outside air introduction from the outside air introduction opening constituted by the gap S to the weight roller 9 and its contact peripheral portion is performed. Is obtained, and the cooling property is secured. Moreover, compared with the cylindrical outer peripheral wall of the prior art, there is almost no outer peripheral wall portion, and thus the movable pulley half A can be reduced in weight.

On the outer peripheral edge 1b ₁ on the back side 1b of the movable pulley half A, a space S is formed between the roller pressing wall 5 and the slider sliding boss 6 as shown in FIGS. Is done. In the space S, the outer peripheral edge 1b ₁ is not formed with an outer peripheral wall other than the roller pressing wall 5 and the slider sliding boss 6.

  The gap S forms an opening between the movable pulley half A and the roller support plate 7 in a combined state. By this opening, the movable pulley half A and the roller support plate 7 The ventilation between the inside and the outside is made good, the outside air is introduced into the back side 1b well, and the inside is prevented from becoming hot.

With the above configuration, the outer peripheral edge 1b ₁ on the back side 1b of the movable pulley half A does not have a cylindrical outer peripheral wall that surrounds the entire periphery as seen in the prior art. Accordingly, only the roller pressing wall portion 5 and the slider sliding boss 6 exist at _one place on the outer peripheral edge 1b. The roller pressing wall 5 is formed to protrude on the outer peripheral edge 1b ₁ so as to correspond to the roller chamber 3 formed in the radial direction in the movable pulley half A. The slider sliding boss 6 is formed between the adjacent roller pressing wall portions 5 and 5. For this purpose, the roller pressing wall 5 and the slider sliding boss 6 are regularly arranged in the circumferential direction, which serves as a cooling fan, and the movable pulley half A rotates at high speed. As a result, the cooling effect can be further improved.

The roller support plate 7 is fixed to the drive shaft 10 so as to be positioned on the back side 1b of the movable pulley half A and to face the back side 1b. The roller support plate 7, as shown in FIG. 3, the mounting boss 7a is formed in the center thereof, the attachment boss 7a through hole 7a ₁ is formed. Around the mounting boss 7a, a plurality of roller pressing portions 7b are formed substantially radially.

  The number of roller pressing portions 7b is the same as the number of roller chambers 3 formed in the movable pulley half A. As shown in the drawing, if the number of roller chambers 3 is 3, the roller pressing portion The number of 7b is also three. The roller pressing portion 7b is formed as an inclined surface, and when the roller support plate 7 is disposed facing the back side 1b of the movable pulley half A, the inclination direction of the roller pressing portion 7b is determined by the roller slide. It inclines in the direction opposite to the inclination direction of the moving surface 3a [see FIG. 1 (A)]. That is, the outer end portions of the roller sliding surface 3a and the roller pressing portion 7b are arranged closer to each other from the center toward the outer periphery.

Wherein the mounting boss 7a through hole 7a ₁ of, as shown in FIG. 1 (A), the drive shaft 10 is fixed through and. That is, the distance between the roller support plate 7 and the fixed pulley half 8 is fixed. A guided portion 7c is formed between the adjacent roller pressing portions 7b and 7b. The該被guide section 7c, is formed a guide recess 7c ₁ notch shape, the slider sliding boss 6 in the guide concave 7c ₁ are adapted to loosely inserted. Then, when the movable pulley half body A is moved in the axial direction by the guide concave 7c _1, wherein while the slider sliding boss 6 is guided, the movable pulley half body A is intended to move in the axial direction.

  The weight roller 9 is formed in a columnar shape, and a synthetic resin portion covering portion 9b is formed so as to cover a cylindrical metal core portion 9a. The dimension of the weight roller 9 in the axial direction is slightly smaller than the distance between the inner surfaces of the guide side walls 3b, 3b of the roller chamber 3, so that an appropriate clearance is generated.

  Then, the weight roller 9 housed in each roller chamber 3 of the movable pulley half A is pressed against the roller sliding surface 3a by the roller pressing portion 7b of the roller support plate 7 together with the tension of the V belt. Yes. Here, when the drive shaft 10 rotates and the rotational speed of the movable pulley half A increases, the weight roller 9 moves the roller sliding surface 3a toward the outer periphery of the movable pulley half A by the centrifugal force. Move. As a result, the movable pulley half A is close to the fixed pulley half 8, the winding diameter of the V-belt is changed, and gear shifting is performed.

  As the rotational speed of the drive side speed change pulley increases, the weight roller 9 moves along the diameter direction of the movable pulley half A by centrifugal force, and the weight support roller 7 causes the weight roller 9 to move to the movable pulley half. The body A is moved in the axial direction. When the rotational speed of the drive side transmission pulley A starts to decrease, the centrifugal force applied to the weight roller 9 decreases, and the winding portion of the wound V-belt is close to the center of the drive side transmission pulley, The speed can be changed by changing the support diameter of the V belt wound around the movable pulley half A and the fixed pulley half 8. The drive-side transmission pulley is attached to the engine-side crankshaft via a drive shaft. The drive pulley according to the present invention is used together with a driven pulley, and serves as a continuously variable transmission for a vehicle such as a two-wheeled vehicle by a centrifugal clutch mounted on the driven pulley.

(A) is a longitudinal side view of the driving pulley of the present invention, (B) is a rear view of the movable pulley half, and (C) is an end view as viewed in the direction of arrows X ₁ -X _{1 in} (B). (A) is a perspective view of a movable pulley half, (B) is a side view of a movable pulley half. (A) rollers front view of a support plate, a _X 2 -X ₂ arrow end view, (C) is _X 3 -X ₃ arrow end view of (A) (B) in (A). (A) is a longitudinal side view in a state where the movable pulley half and the roller support plate are close to each other, and (B) is a longitudinal side view in a state where the movable pulley half and the roller support plate are separated from each other. It is a vertical side view of embodiment which made the roller pressing wall part the required minimum height. It is a vertical side view which shows a prior art.

Explanation of symbols

A ... movable pulley half, 1b ... back side, 1b ₁ ... outer peripheral edge, 5 ... roller presser wall,
6 ... Slider sliding boss, 7 ... Roller support plate, 8 ... Fixed pulley half,
9: weight roller, S: gap.

Claims (3)

In a driving pulley comprising a movable pulley half, a fixed pulley half, a weight roller, and a roller support plate, the outer peripheral edge on the back side of the movable pulley half is an annular flat surface so as to be orthogonal to the axial direction. A roller chamber in which the weight roller is accommodated is formed in a substantially radial shape, and a roller pressing wall portion is provided along the axial direction from the outer peripheral edge on the back side of the movable pulley half at the roller chamber portion. A slider sliding boss is formed between the roller pressing wall portions, and the height of the roller pressing wall portion with respect to the outer peripheral edge on the back side of the movable pulley half is the slider sliding boss. The roller pressing wall portion and the slider sliding boss are formed apart from each other on the outer peripheral edge, and at the outer peripheral edge, the roller pressing wall portion and the slider sliding boss are Between Drive pulley of the V-belt transmission, characterized by comprising formed as gap portion.   The drive pulley of a V-belt transmission according to claim 1, wherein the height of the roller pressing wall portion is smaller than substantially half of the height of the slider sliding boss.   The drive pulley of the V-belt transmission according to claim 1, wherein the height of the roller pressing wall portion is larger than approximately half of the height of the slider sliding boss.

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