JPH0533846A - Pulley structure for v-belt type continuously variable transmission - Google Patents

Abstract

PURPOSE:To firmly fix a drive side clutch of clutch unit or the like to a boss part end in a rotary unit of pulley unit or the like by consisting of a fixed pulley half unit and a movable pulley half unit of continuously variable transmission or the like. CONSTITUTION:In a fixed pulley half unit A and a drive side clutch C1 fixed to a boss 1 of the fixed pulley half unit A and rotated with rotating action of a rotary unit, a stop external tooth part 6 and a stopped internal tooth part 7 are formed respectively in a peripheral side surface of the boss 1 and in a center side internal periphery of the drive side clutch C1. Tooth thickness t6 of each external tooth 6a for constituting this stop external tooth part 6 is set larger than the tooth thickness t7 of each internal tooth 7a for constituting the stopped internal tooth part 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a fixed pulley half body such as a continuously variable transmission and a movable pulley half body. A rotary body such as a pulley body has a boss portion end of the rotary body. The present invention relates to a pulley structure of a V-belt type continuously variable transmission capable of firmly fixing a drive side clutch.

[0002]

2. Description of the Related Art There is a component in which a driving clutch is incorporated in a pulley body composed of a fixed pulley half body and a movable pulley half body. There is also a spline structure for attaching a drive clutch to the boss portion of the fixed pulley half body.

[0003]

In the above pulley body, a spline structure is used for connecting and fixing the boss portion of the fixed pulley half body and the driving side clutch, but the fixed pulley half body is made of cast aluminum. Yes, if the drive clutch is an iron casting, the tooth thickness of the fixed pulley half in the spline structure will be formed to be larger than the tooth thickness on the side of the drive clutch. If different, the tooth thickness of the meshing teeth differs depending on the strength, but if the fixed pulley half and the drive clutch are made of the same metal material, the meshing tooth thicknesses may be substantially the same. is there.

If the tooth thickness of the meshing teeth is changed as described above depending on whether the constituent metals are the same or different, there is a drawback in that production cannot be unified and production efficiency is reduced.

[0005]

Therefore, as a result of intensive research, the inventor has fixed the invention to the fixed pulley half body and the boss of the fixed pulley half body to rotate the same. In the drive side clutch that rotates with the rotation of the body, a locking outer tooth portion is formed on the outer peripheral side surface of the boss, and a locked inner tooth portion is formed on the center side inner periphery of the driving side clutch. The tooth thickness of each external tooth that constitutes the stationary external tooth portion is
A metal material that constitutes the fixed pulley half body and the drive clutch by adopting the pulley structure of the V-belt type continuously variable transmission that is made thicker than the tooth thickness of each inner tooth that constitutes the locked inner tooth portion. Even if they are the same or different from each other, the tooth thickness of the splined tooth is manufactured under a certain condition, and the production efficiency is improved.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

The present invention relates to a pulley device for continuously variable transmission of a motorbike, a scooter or a motorcycle.

The fixed pulley half A and the movable pulley half B are combined to form a pulley structure, which is provided on the driven shaft 8. As shown in FIG. 2, the fixed pulley half A is composed of a boss 1 and a face 2 having a flat conical shape, and an axial center through hole 1a is formed in the boss 1. The face 2 has a casting surface. As it is, it may be used with the chill layer present.

As shown in FIGS. 1 and 2, the movable pulley half B has a movable face 4 formed at one end of the sliding boss 3 in the axial direction.

The boss 1 of the fixed pulley half A is rotatably provided on the driven shaft 8, and the drive plate of the drive side clutch C ₁ is provided at the axially long end of the boss 1 opposite to the face 2 forming portion. 5 is fixed, and a coil spring 9 is provided between the driving side clutch C ₁ and the movable pulley half B (see FIG. 1).

[0011] The driving-side clutch C ₁ receives a rotational force from the fixed pulley half body A, and transmits the rotational force to the driven side clutch C _2, the driven side clutch C ₂ is what through the driven shaft 8 The tire is rotated through a stepped reduction mechanism.

The driving plate 5 of the driving-side clutch C ₁ has one end (face 2) in the axial direction of the boss 1 of the fixed pulley half A.
It is fixed on the side opposite to the forming side) and receives elastic force from the coil spring 9 provided on the movable pulley half B already mounted on the boss 1.

The driving side clutch C ₁ and the boss 1 of the fixed pulley half A are the boss 1 as shown in FIGS.
Locking external teeth portion 6 formed at the end of the drive clutch C
Due to the engagement with the locked internal tooth portion 7 formed in ₁ , it is fixed so as not to rotate idly.

The locking external tooth portion 6 is formed in a substantially external gear shape and is formed during die casting of the fixed pulley half body A. The locked internal tooth portion 7 is formed in a substantially internal gear shape and has a drive side clutch C ₁
Is formed in the center of the.

Each external tooth 6 which constitutes the locking external tooth portion 6
As shown in FIG. 5, the tooth thickness t _{6 of “a”} is larger than the tooth thickness t ₇ of each of the inner teeth 7 a that form the locked inner tooth portion 7. In particular, the tooth thickness here means the length of each tooth in the direction orthogonal to the tooth width defined by the gear.

The tooth thickness t ₆ of the outer tooth 6a and the tooth thickness t _{7 of the} inner tooth 7a.
The magnitude relationship between and is as follows. First, boss 1
As shown in FIG. 6, when the fixed pulley half A is rotated and the forces of the two are in balance, the center O of the boss 1 is fixed to the driving clutch C ₁ fixed thereto. The distance R ₆ from ₁ to the root of the external tooth 6a and the external tooth 6
The magnitude of (a) multiplied by the load F ₆ relating to the tooth root, that is, the value of (distance) R ₆ × (load) F ₆ is the center O _{1 of the} boss _1.
From the internal teeth 7a and the distance R ₇ to dedendum, internal load applied to the tooth root of the tooth 7a (shear loading) size multiplied by the F _7, i.e., (distance) of the R ₇ × (load) F ₇ Is equal to the value.

That is, the formula of (distance) R ₆ × (load) F ₆ = (distance) R ₇ × (load) F ₇ is established. Here, it is clear from FIG. 6 that (distance) R ₇ > (distance) R ₆ and therefore (load) F ₆ > (load) F ₇ . That is, it can be seen that the load F ₆ applied as a shear load to the roots of the outer teeth 6a of the boss 1 is always larger than the load F ₇ applied to the inner teeth 7a of the drive side clutch C ₁ as a shear load.

Therefore, the boss 1 and the drive side clutch C ₁
When and are in balance during operation, the external teeth 6a
The shear stress at the root of the tooth is F ₆ ÷ t ₆ , and the shear stress at the root of the internal tooth 7a is F ₇ ÷ t ₇ , and in the balanced state, the following equation is obtained.
F ₆ ÷ t ₆ = F ₇ ÷ t ₇

In the above equation, (load) F ₆ > (load) F
₇ has been described above, and therefore t ₆ > t ₇ , which means that the tooth thickness t _{6 at} the root of the external tooth 6a is always
By forming the inner tooth 7a to have a thickness larger than the tooth thickness t ₇ at the root of the tooth, the mechanical strength of the locked outer tooth portion 6 and the locked inner tooth portion 7 becomes stable.

The engaged internal tooth portion 7 of the driving side clutch C ₁
The locking outer tooth portion 6 of the boss 1 has a spline shape, but is not limited to the spline itself.

[0021]

According to the present invention, the fixed pulley half body A is used.
And a driving side clutch C ₁ fixed to the boss 1 of the fixed pulley half A and rotating with the rotating operation of the rotating body, a locking external tooth portion 6 is formed on the outer peripheral side surface of the boss 1, and the driving side clutch A locked inner tooth portion 7 is formed on the inner circumference of the center of C ₁ , and the tooth thickness t ₆ of each outer tooth 6a constituting the locked outer tooth portion 6 is defined by the locked inner tooth portion 7 Each internal tooth 7a constituting the
By adopting a pulley structure of a V-belt type continuously variable transmission having a tooth thickness larger than the tooth thickness t ₇ , firstly, the configurations of the locking outer tooth portion 6 and the locked inner tooth portion 7 are unified. And secondly, the fixed pulley half A and the drive side clutch C ₁
The same means can be used for manufacturing regardless of the material forming the.

Explaining these effects in detail, the external teeth 6 of the locking external teeth 6 formed on the boss 1 of the fixed pulley half A are shown.
The tooth thickness t ₆ at the tooth base of a is set to the inner tooth 7a of the locked inner tooth portion
Since the tooth thickness is larger than the tooth thickness t _{7 at} the root of the tooth, the mechanical strength of the outer tooth 6a and the inner tooth 7a can be always balanced.

This holds even when the fixed pulley half A and the driving side clutch C ₁ are made of the same material, and the driving side clutch C ₁
Since it can be made similar to the case where is made of a material stronger than the fixed pulley half body A, it can be manufactured regardless of the constituent material.

[Brief description of drawings]

FIG. 1 is a sectional view of a pulley structure using the structure of the present invention.

FIG. 2 is a perspective view of an essential part of the present invention.

FIG. 3 is an exploded perspective view of essential parts.

[Fig. 4] Side view of main parts

5 and 6 are enlarged views of a main part showing the operation of the present invention.

[Explanation of symbols]

A ... fixed pulley half C ₁ ... driving clutch 1 ... boss 6 ... engaging outer teeth 6a ... outer teeth 7 ... engaged in toothing 7a ... inner teeth t _6, t ₇ ... tooth thickness

Claims (1)

Claim: What is claimed is: 1. A fixed pulley half body and a drive-side clutch fixed to a boss of the fixed pulley half body and rotating with a rotating operation of a rotating body, wherein the outer peripheral surface of the boss is not locked. A tooth portion is formed, and a locked inner tooth portion is formed on the inner circumference of the center of the drive side clutch, and the tooth thickness of each outer tooth that constitutes the locked outer tooth portion is A pulley structure for a V-belt type continuously variable transmission, characterized in that it is made thicker than the tooth thickness of each internal tooth that constitutes the part.