JPH0133703B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a V-belt type automatic transmission, and more particularly, a movable sheave is mounted on a rotating shaft so as to be movable in the axial direction, facing one side of a spider fixed on the rotating shaft. is covered by a cap mounted on the rotating shaft so as to be movable in the axial direction facing the other side of the spider, and the spider is housed inside the movable sheave and the cap, and the torque of the rotating shaft is controlled by the spider. is transmitted to the movable sheave and cap,
The present invention relates to a V-belt type automatic transmission in which the movable sheave and the cap are moved forward and backward relative to a fixed sheave fixed on a rotating shaft by means of a centrifugal weight placed between the spider and the movable sheave.

Generally, in this type of V-belt type automatic transmission, under operating conditions such as high torque and high load, slip occurs between the V-belt and the two sheaves that sandwich it, generating frictional heat. As a result, the automatic transmission is heated, which adversely affects the torque transmission efficiency, the life of the V-belt, and the durability of other structural members. Therefore, it is required to actively cool the automatic transmission, and from the viewpoint of cost, weight, etc., it is desirable to provide the automatic transmission itself with a cooling function without employing a special cooling device. For this reason, the following measures have conventionally been taken to deal with this problem.

The first method is to provide an appropriate opening in the cap of this type of V-belt automatic transmission and allow air to circulate inside and outside through this opening during operation, but this method is not sufficient. The cooling effect cannot be obtained. A second method is to omit the cylindrical part of the conventional cap and provide a large annular opening between the cap and the movable sheave, and allow air inside and outside to freely flow through this annular opening. ,
In this method, the cap and movable sheave must be reinforced with rigidity against centrifugal force, and each component housed inside the cap and movable sheave becomes exposed, giving the user a sense of anxiety. There is a risk.

The present invention has been made in view of the above-mentioned circumstances, and its main purpose is to provide a V-belt type automatic transmission which is free from the above-mentioned disadvantages and has a high cooling effect.

The present invention will be described below with reference to the drawings. FIGS. 1 and 2 show an example of a drive-side pulley of a V-belt type automatic transmission according to the present invention. This drive-side pulley includes a spider 21 fixed on the rotating shaft 11 by casting means, and a movable sheave mounted opposite one side of the spider 21 so as to be movable in the axial direction via an alignment bearing 12. 22 and movable sheave 22
A fixed sheave 23 is provided opposite to one side of the holder and screwed through a split collar 13. In addition, the rotating shaft 11
A cap 24 is mounted on the top of the spider 21 so as to be movable in the axial direction via an alignment bearing 14 so as to face the other side of the spider 21 . This cap 24 consists of a circular bowl-shaped side plate 24a and a cylindrical outer cylindrical part 24b extending in the axial direction from the outer periphery of the side plate 24a.
The movable sheave 22 is fixed to the movable sheave 22 with a plurality of bolts 25 while being fitted onto the outer peripheral edge of the movable sheave 22 . Thereby, the spider 21 is accommodated in the space formed by the movable sheave 22 and the cap 24. Further, a return spring 31 is interposed between the spider 21 and the cap 24, and urges the cap 24 and the movable sheave 22 integrated therewith to the left in the figure, and forces the movable sheave 22 and the fixed sheave 22
A predetermined interval for holding the V-belt 15 is formed between the three.

On the other hand, on the other side of the movable sheave 22, three sliders 32 are provided at equal intervals. These sliders 32 protrude in the axial direction and extend toward the side plate portion 24a of the cap 24, and the axial engagement grooves 32a provided in each slider 32 are provided with radial engagement protrusions provided in the spider 21. 21a is engaged so as to be relatively movable in the axial direction. In addition, the movable sheave 22
On the other side, three centrifugal weights 33 are pivotally mounted at equal intervals. These centrifugal weights 33 are pivotably attached to the outer circumferential side, and are attached to the spider 21.
The collar 34 is in contact with the inner side of each collar 34 attached to the collar 34. Each collar 34 is provided on the spider 21 and is connected to the side plate portion 24a of the cap 24 and the outer circumferential tube portion 24.
It is attached to the arm portion 21b extending toward the b side.

Therefore, on the side plate portion 24a of the cap 24,
Three openings 24c are provided at equal intervals.
Each opening 24c is located opposite to each arm 21b provided in the spider 21 and protruding toward the side plate 24a, and when the movable sheave 22 and the cap 24 move forward at their maximum relative to the fixed sheave 23 (imaginary in FIG. A portion of the tip of each arm portion 21b is formed in a size such that it protrudes to the outside at the position indicated by the line).

In the drive side pulley of the automatic transmission configured in this way, when the rotating shaft 11 rotates due to the rotation of the crankshaft 16, this torque is transferred to the spider 2.
1 to the movable sheave 22 and the cap 24, and further transmitted to the driven side pulley (not shown) via the V-belt 15 held between the movable sheave 22 and the fixed sheave 23. Furthermore, when the rotational speed of the crankshaft 16 increases, the centrifugal force acting on each centrifugal weight 33 increases correspondingly, and the amount of outward rocking of each centrifugal weight 33 increases, causing the movable sheave 22 and When the cap 24 is gradually moved against the return spring 31 in the direction shown by the imaginary line in FIG. Move gradually in the direction shown. For this reason, V at both sheaves 22 and 23
The clamping position of the belt 15 changes according to the rotational speed of the crankshaft 16, and the speed of the driven pulley to which torque is transmitted via the V-belt 15 is automatically changed.

By the way, even in this automatic transmission, under operating conditions such as high torque and high load, slips occur between both sheaves 22, 23 and the V-belt 16, generating frictional heat. However, when the movable sheave 22 and the cap 24 move forward relative to the fixed sheave 23, each arm portion 21b of the spider 21
A portion of each arm portion 21b is gradually exposed from each opening 24c of the cap 24, and a portion of each arm portion 21b completely protrudes at the maximum forward movement (position shown by the imaginary line). Therefore, a portion of each arm portion 21b rotates in the outside air to enhance the cooling effect on the spider 21, and a portion of each arm portion 21b functions as a fan blade to agitate the outside air near the surface of the cap 24. This increases the cooling effect on the cap 24, and increases the circulation of internal and external air from each opening 24c, thereby efficiently discharging the heat inside the movable sheave 22 and the cap 24. Therefore, the adverse effects on the torque transmission efficiency, the life of the V-belt, and the durability of other components due to heating of the automatic transmission are eliminated.

In this embodiment, each opening 24c is formed in the side plate 24a of the cap 24 facing each arm 21b of the spider 21. If other protrusions extending in the axial direction are formed, each opening can be provided at a portion of the cap that faces these protrusions. In addition, the present invention is not limited to the drive-side pulley shown in this embodiment, but also includes a movable sheave that is movable in the axial direction on the rotating shaft, facing one side of the spider fixed on the rotating shaft. The spider is covered by a cap mounted movably in the axial direction on the rotating shaft facing the other side of the spider, and the spider is housed inside the movable sheave and the cap, and the torque of the rotating shaft can be adjusted by the spider. Various types of V-belt type automatic transmissions in which transmission is transmitted to the sheave and cap, and these movable sheaves and caps are moved forward and backward relative to a fixed sheave fixed on the rotating shaft by means of a centrifugal weight placed between the spider and the movable sheave. It can be implemented in

As explained above, in the present invention, in the various types of V-belt automatic transmissions described above, a plurality of protrusions protruding toward the cap side are provided on the other side of the spider, and the plurality of protrusions are provided opposite to the protrusions. The structure is characterized in that the cap is provided with a plurality of openings, and when the movable sheave and the cap move forward at maximum, a portion of each protrusion of the spider protrudes to the outside from each opening of the cap. be. Therefore, according to the present invention, it is possible to rotate each protrusion of the spider directly in the outside air,
Each protrusion of the spider can function as a fan blade, without causing various inconveniences of conventional V-belt type automatic transmissions of this type.
Cooling efficiency can be increased.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view of a drive-side pulley of an automatic transmission according to the present invention, and FIG. 2 is a partially cutaway partial front view seen from the cap side of FIG. 1. Explanation of symbols, 11...Rotating shaft, 15...V belt, 16...Crankshaft, 21...Spider, 21b...Protrusion part (arm part), 22...Movable sheave, 23...Fixed sheave, 24 ...Cap, 24c...Opening, 32...Slider, 33
...Centrifugal weight.

Claims (1)

[Claims] 1. A movable sheave, which is mounted so as to be movable in the axial direction on the rotating shaft facing one side of the spider fixed on the rotating shaft, is mounted on the rotating shaft in the axial direction facing the other side of the spider. The spider is covered by a movably assembled cap, and the spider is housed inside the movable sheave and the cap, and the spider transmits the torque of the rotating shaft to the movable sheave and the cap, and In a V-belt type automatic transmission in which a sheave and a cap are moved forward and backward relative to a fixed sheave fixed on the rotating shaft by a centrifugal weight placed between the spider and the movable sheave, the cap side is located on the other side of the spider. a plurality of protrusions protruding into the cap, and a plurality of openings in the cap opposite to the protrusions, so that when the movable sheave and the cap move at maximum, a portion of each protrusion of the spider is inserted into each of the caps. A V-belt automatic transmission characterized by protruding outward from an opening.