JPH0215741B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a V-belt continuously variable transmission.

In a conventional V-belt continuously variable transmission, the belt pulley on the driving side has a fixed member fixed to the drive shaft and rotates together with the fixed member, and a movable member provided opposite to the fixed member so as to be slidable in the axial direction on the drive shaft. The actuator is provided in a housing portion formed on the opposite side of the surface facing the fixed member of the movable member, and a guide plate that faces the housing portion and engages with the actuator is provided on the drive shaft. It is provided so that it cannot move in the axial direction, and when the actuator moves outward along the guide plate as the drive shaft rotates, the movable member is displaced toward the fixed member, and the effective diameter of the belt pulley increases. There are some that are configured to do so.

In such a V-belt continuously variable transmission, grease is sealed in the housing portion of the movable member to lubricate the actuator housed therein.

However, when the movable member is displaced toward the fixed member as the rotation of the drive shaft increases, the distance between the movable member and the guide plate facing it increases, and the grease in the housing is scattered outside due to centrifugal force. There was a problem that the V-belt would slip due to adhesion to the suspension part of the V-belt, which is sensitive to oil.

In order to solve this problem, conventional devices have been equipped with a sealing device that covers and seals the housing section and the guide plate from the outside.One example is a device that is equipped with a cover made of approximately cylindrical sheet metal. However, a space in the axial direction is required to install and fix this cover, and if the vehicle is equipped with a V-belt continuously variable transmission and there is not enough axial space, it is necessary to secure that space. This is a major design hurdle. Further, in the V-belt continuously variable transmission, dust is scattered due to wear of the belt during operation, and the dust enters the housing part through the gap in the cover and interferes with the operation of the actuator.
There is also the problem.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to prevent grease, etc. inside the storage section from scattering to the outside and to prevent dust from entering into the storage section when the drive shaft rotates. An object of the present invention is to provide a V-belt continuously variable transmission in which the installation space in the axial direction on a drive shaft is shortened.

An example of the implementation of the present invention is a V used for a motorcycle.
The belt continuously variable transmission will be explained with reference to the drawings. In the figure, A is a two-stroke engine, and b is a belt pulley on the drive side of the V-belt continuously variable transmission.

The belt pulley b is provided at the end of the drive shaft, that is, the crankshaft 1 of the engine A, and includes a fixed member b ₁ and a movable member.
b It is divided into _two parts.

The fixing member _b1 is spline-fitted to the crankshaft 1 so as to rotate together with the crankshaft 1, and is also held between the clutch 2 and the collar 3 so as not to move in the axial direction on the crankshaft 1. There is.

The crank 2 engages with a clutch 5 rotated by a crankshaft 4 when the engine A is started, thereby causing the crankshaft 1 to rotate.

Further, the collar 3 is fitted onto the crankshaft 1 and rotates together with the crankshaft 1.

On the other hand, the movable member b ₂ is provided facing the fixed member b ₁ and slidable in the axial direction on the crankshaft 1,
The V-belt 6 is held between the fixing member b1 and the fixing member _b1 .

The V-belt 6 is suspended across the belt pulley b and a driven side belt pulley (not shown), so that the rotation of the driving side belt pulley b is transmitted to the driven side belt pulley.

A bush 7 is press-fitted into the inner periphery of the movable member _b2 , and is fitted onto the outer periphery of the collar 3 so as to be slidable in the axial direction.

That is, the movable member _b2 is allowed to slide freely on the crankshaft 1 in the axial direction via this bush 7.

Reference numeral 8 denotes a housing section provided on the opposite side of the movable member b ₂ to the surface facing the fixed member b ₁ , that is, on the back surface.

This accommodating part 8 has a plurality of, for example, 6 accommodating parts on the back of the movable member _b2 .
Two actuators 9 are provided, each housing an actuator 9.

The actuator 9 is a sphere, a roller, or the like, and is adapted to be displaced outward by the centrifugal force accompanying the rotation of the movable member _b2 .

Further, the actuator 9 is adapted to rotate within the housing part 8 by engaging with a guide plate 10, which will be described later. Therefore, grease is sealed in the housing part 8 to lubricate the actuator 9. There is.

The guide plate 10 is spline-fitted to the crankshaft 1 so as to rotate together with the crankshaft 1, and
The accommodation portion 8 of the movable member _b2 is held between the collar 3 and the housing 11a of the one-way clutch 11.
It is provided on the crankshaft 1 so as to be immovable in the axial direction.

Then, the guide plate 10 is the housing part 8 of the movable member _b2.
The part facing the is inclined so that it fits there,
The actuator 9 is engaged with the actuator 9 via the inclined portion 10a.

In addition, the portion of the guide plate 10 other than the inclined portion 10a is protruded so as to fit between the accommodating portions 8 of the movable member _b2 , and a synthetic resin connecting member 12 is fitted around the periphery of the protruding portion 10b. .

The connecting member 12 connects the guide plate 10 and the movable member _b2 , and is formed in a substantially U-shape and connects the movable member _b2.
The movable member _b2 is fitted into the reinforcing rib 13 of the guide plate 10 to rotate together with the guide plate 10.

Further, the connecting member 12 is slidable in the axial direction of the crankshaft 1 with respect to the reinforcing rib 13.

Therefore, the movable member b ₂ can freely slide in the axial direction with respect to the guide plate 10 while rotating together with it, but both are made of metal and the movable member b ₂ is softer than the guide plate 10. Since it is made of aluminum, noise generation and wear of the movable member _b2 can be effectively prevented by interposing the connecting member 12 as described above rather than directly connecting the two.

As the belt pulley b rotates, the fixing member b ₁ is integrated with the crankshaft 1, which is the drive shaft.
As the guide plate 10 rotates, the movable member _b2 rotates together with the guide plate 10.

As the crankshaft 1 rotates upward, the actuator 9 moves outward along the inclined portion 10a of the guide plate 10, and the actuator 9 pushes the movable member _b2 toward the fixed member _b1 .

As a result, the V-belt 6 is moved to the outer periphery of the belt pulley b, the effective diameter of the belt pulley b increases, and the rotation speed of the belt pulley on the driven side is increased.

Note that when the movable member b ₂ is displaced toward the fixed member b ₁ , the guide plate 10 moves away from the movable member b ₂ relative to it, opening a gap between them. There is a risk that the liquid may pass between the actuator 9 and the guide plate 10 and be scattered to the outside due to centrifugal force.

Therefore, in order to eliminate such concerns, a sealing device is provided to seal the housing portion 8.

This sealing device is fixed to the outer periphery of the movable member _b2 ,
The housing portion 8 and the guide plate 10 are covered by a cover 14 interposed in a space between the guide plate 10 and the housing 11a of the one-way clutch 11.

The cover 14 is made of an elastic member such as rubber and is formed into a substantially disk shape with an opening 14a in the center, and a mounting portion 14b protruding toward the movable member b ₂ on the outer periphery thereof is attached to the movable member b. ₂ Fits around the outer periphery.

The mounting portion 14b is made thicker than other parts of the cover 14, and has increased rigidity.

Reference numeral 14c denotes a flexible portion provided in an annular shape on the outer periphery of the cover 14, and this flexible portion 14c expands when the cover 14 is deformed, thereby compensating for the expansion of the cover 14 in the radial direction and preventing excessive force from being applied to the cover 14. I'm getting used to not having to worry about it.

Reference numeral 15 denotes an annular metal disk provided to reinforce the periphery of the opening 14a of the cover 14, and is integrally cast into the periphery of the opening 14a when the cover 14 is molded. Due to the centrifugal force caused by the radial elongation and high speed rotation, the opening 14a
prevent damage by regulating the spread of

On the other hand, the inner end of the cover 14, that is, the opening 14a
The peripheral edge approaches or comes into contact with the outer surface of the guide plate 10 when the crankshaft 1 is stopped and rotates at low speed.

Reference numeral 16 denotes a locking member made of sheet metal that fits onto the outer periphery of the cover 14 and locks and fixes it to the movable member _b2 , and is formed into a substantially cylindrical shape and has one end thereof, that is, the inner circumference on the side of the movable member _b2 . The protrusion 16a protruding from the movable member
b ₂ is elastically fitted and locked in the recess 17 on the outer periphery,
The other end is adapted to engage with the outer periphery of the cover 14.

Therefore, the cover 14 is closed via this locking member 16.
is fixed to the movable member b ₂ , and the fixed member of the movable member b ₂
b The cover 14 is configured to be displaced as the cover 14 is displaced toward the ₁ side.

Therefore, when the movable member b ₂ of the belt pulley b equipped with such a sealing device is displaced toward the fixed member b ₁ as the rotation of the crankshaft 1 increases, the cover 14 is also displaced. opening 1
Since the peripheral edge 4a is close to or in contact with the outer surface of the guide plate 10, the peripheral edge of the opening 14a is close to or in contact with the outer surface of the guide plate 10.
Further displacement is regulated while in contact with.

Therefore, only the outer peripheral portion of the cover 14 is displaced and elastically deformed into a dish shape as shown in FIG. 2, thereby sealing the housing portion 8 together with the guide plate 10.

As a result, the sealing performance of the housing portion 8 is maintained,
Grease in the housing part 8 is not scattered to the outside.

As described above, the present invention fixes a cover that covers the accommodation portion of the movable member and the guide plate to the outer periphery of the movable member, and also connects the guide plate and the housing of the one-way clutch provided on the drive shaft adjacent to the guide plate. Since the guide plate, the cover, and the clutch housing work together to form a maze in which the passage detours around like a labyrinth, the guide plate, the cover, and the clutch housing work together to form a maze in which the passage detours around the drive shaft. Grease, etc. inside the section does not scatter outward, and dust, etc., does not scatter due to wear of the V-belt and enter the housing section, so the actuator operates easily and reliably. In addition, the drive shaft can be made compact without requiring any special axial mounting space on the drive shaft, and there is also the advantage that the space between the one-way clutch and the guide plate can be used effectively.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional plan view showing the device of the present invention, Fig. 2 is a cross-sectional plan view showing the operating state of the main parts, Fig. 3 is an exploded view of the main parts, Fig. 4 is a side view of the movable member, and Fig. 5 is a side view of the guide plate. In the figure, A...engine, b...driver side belt pulley, _b1 ...fixed member, _b2 ...movable member, 1...
Crankshaft (drive shaft), 8... Accommodation part, 9... Operator, 10... Guide plate, 11... One-way clutch, 11a... One-way clutch housing, 1
4...Cover.

Claims (1)

[Claims] 1. In a belt pulley on the drive side that is composed of a fixed member that is fixed to the drive shaft and rotates together with the drive shaft, and a movable member that is provided so as to be slidable in the axial direction on the drive shaft in opposition to the fixed member, the movable member An actuator is provided in a housing portion formed on a side opposite to a surface facing the fixed member, and a guide plate that faces the housing portion and engages with the actuator is provided on the drive shaft so as to be immovable in the axial direction. , V configured such that as the rotation of the drive shaft increases, the actuator moves outward along the guide plate, thereby displacing the movable member toward the fixed member and increasing the effective diameter of the belt pulley.
In the continuously variable belt transmission, a cover that covers the accommodation portion of the movable member and the guide plate is fixed to the outer periphery of the movable member, and a one-way cover provided on the drive shaft adjacent to the guide plate. A V-belt continuously variable transmission characterized by being interposed in a space between a clutch and a housing.