JPS61192956A - Belt driven automatic transmission - Google Patents

Abstract

PURPOSE:To improve cooling efficiency of a driving belt and/or a pulley, by forming in the pulley a circulating path for cooling fluid. CONSTITUTION:A fixed pulley half structure 2a of a driving pulley 2 is constituted by integrally fixing a fixed face 8 and a side cover 9 so as to provide a clearance G in the structure 2a. The structure 2a, interposing a separator 10 between said fixed face 8 and side cover 9, forms divided chambers G1, G2, and the both divided chambers G1, G2 communicate through a hole 11. And the structure 2a, connecting the divided chamber G1 with a cooling fluid supply pipe 12 while the divided chamber G2 air-tightly with a cooling fluid discharge port 16, constitutes a circulating path for cooling fluid.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to automatic transmissions, and particularly to automatic transmissions, and more particularly, to automatic transmissions. This invention relates to an automatic transmission that can be operated.

"Conventional technology" Yuki, Hakudoba; East #I) -1,1-Effect 1 Rokubo Xenmon Show 1-
A structure shown in Q7347 is known.

The transmission includes a drive pulley that is rotationally driven by an engine, and a driven pulley that is rotationally driven via a drive belt wound around the drive pulley, and each pulley has a rotating shaft that supports them. The drive belt consists of a fixed pulley half fixed to the rotary shaft, and a movable pulley half attached to the rotary shaft so as to be movable in its length direction to change the winding radius of the drive belt. By moving each of the movable pulley halves of the pulley and the driven pulley, a speed change operation is performed by changing the ratio of the winding radius of the drive belt on the drive pulley to that on the driven pulley.

By the way, in a transmission equipped with such a drive belt, slippage that occurs between the drive belt and each pulley, friction when they bite or separate, and bending of the drive belt may cause problems. It is known that the pulleys and drive belts generate heat. Since this heat is the main cause of deterioration in drive belts mainly made of rubber, countermeasures are required.

Conventionally, the drive belts and pulleys were cooled by rotating fins provided on the outside of each pulley together with the pulley to stir the air in the belt chamber where the pulleys, drive belts, etc. were housed. I have to.

"Problems to be Solved by the Invention" The present invention aims to further improve the durability of the transmission by solving the following problems remaining in the conventional technology described above. .

That is, in the conventional technology, heat is removed by stirring the air in the belt chamber and cooling the wall of the pulley, but the heat generation phenomenon described above mainly occurs at the contact area between the pulley and the drive belt. However, since the contact area is surrounded by both parts and heat tends to accumulate, for example, when the engine output is increased, the belt chamber and
The problem is that there is a risk that the cooling effect will be reduced if only the air is stirred.

"Means for Solving the Problems" The present invention aims to provide two inventions regarding a belt automatic transmission that can effectively embody the above-mentioned points to be improved. and a driven pulley that is rotationally driven via a drive belt wound around the drive pulley, each of the pulleys includes a fixed pulley half fixed to a rotating shaft that supports them, and a driven pulley that is fixed to a rotating shaft that supports them, and a driven pulley that is fixed to a rotating shaft that supports the pulleys. a movable pulley half that is attached movably in the longitudinal direction and forms a winding surface of the drive belt together with the fixed pulley half, and the movable pulley half is opposite to the surface that forms the winding surface of the fixed pulley half. The second invention is characterized in that a cooling fluid circulation path is formed in which the cooling fluid is circulated from the vicinity of the rotation center of the fixed pulley half toward the outer periphery. In addition to providing a circulation path on both the drive pulley and the driven pulley,
It is characterized in that each cooling fluid circulation path is arranged to sandwich the drive belt.

"Operation" The present invention has the above-described configuration, so that in the first invention, the cooling fluid is circulated from the center of rotation of the stationary pulley half, which is the part that generates the highest amount of heat, toward the outer periphery. In addition, in the second invention, the cooling action in the first invention described above is caused to occur on both sides of the drive belt, thereby uniformly cooling the drive belt. It is something.

"Embodiment" Hereinafter, a preferred embodiment of the first invention will be described in detail based on FIG. 1.

In FIG. 1, the symbol l indicates a belt automatic transmission (hereinafter abbreviated as transmission) according to this embodiment, which includes a drive pulley 2 that is rotationally driven by an engine (the path shown in the figure), and A driven pulley 4 is rotationally driven via a wound drive belt 3, and each pulley 2.4 has fixed pulley halves 2a, 4a fixed to a rotating shaft 5.6 that supports them. , movable pulley halves 2b and 4b, which are attached to the rotating shaft 5.6 so as to be movable in the longitudinal direction thereof and form the winding surface A of the drive belt 3 together with the fixed pulley halves 2a and 4a, and ,
Winding surface A of the fixed pulley half 2a of the drive pulley 2
In this embodiment, a cooling fluid circulation path 7 for circulating cooling fluid from near the rotation center of the fixed pulley half 2a toward the outer periphery is formed on the opposite side to the surface forming the fixed pulley half body 2a. Water is used as the cooling fluid.

Next, to explain these details in detail, the fixed pulley half 2a constituting the drive pulley 2 forms the winding surface A of the drive belt 3 in a V-shape together with the movable pulley half 2b which is another component. A fixed face 8 is provided, and on the back side of the fixed face 8, that is, on the opposite side to the side forming the winding surface A and on the left side in FIG. A side cover 9 that forms a gap G is integrally provided. There is a gap G between the side cover 9 and the fixed face 8.
A separator 10 is interposed to airtightly divide the chamber into two to form divided chambers Gl and G2, and a through hole 11 is provided on the outer periphery of the separator 10 to communicate the two side chambers G1 and G2. A cooling water supply pipe 12 communicating with one of the divided chambers G1 on the fixed face 8 side is integrally provided in the center. The cooling water supply pipe 12 is rotatably provided through a belt chamber cover 13 that covers a belt chamber B in which the belt automatic transmission 1 is housed, and a mechanical pipe is provided at the penetrating portion to seal the space between the two. A seal 14 is interposed, and a cooling water supply pipe 12 (this is connected to a cooling water supply pump, not shown). On the other hand, the rotation center of the side cover 9 is connected to the cooling water supply pipe 12. A through hole 15 is formed to form a gap between the two, and between the peripheral edge of the through hole 15 and the belt chamber cover 13, it communicates with the divided chamber G2 around the cooling water supply pipe 12. A mechanical seal 17 is interposed to form a cooling water discharge passage 16.
2, the divided chamber Gl, the through hole 11, and the cooling water discharge path 16 constitute the cooling fluid circulation path 7 of this embodiment.

The movable pulley 2b, which is the other component of the drive pulley 2, has a movable face 1 facing the fixed face 8.
8, and a large number of ventilation passages 19 are formed radially outward from the rotation center on the opposite side to the side facing the fixed face 8. The end portion communicates with the space C formed by both pulley halves 2a, 2b and the drive belt 3 through the communication hole 20, and the outer peripheral end portion communicates with the drive belt through the communication hole 21. It is communicated with the outside of the pulley 2.

On the other hand, a variable mechanism 22 is provided on the side of the movable pulley half 2b where the ventilation passage 19 is provided, for moving the movable face 18 toward and away from the fixed pulley half 2a as the rotation shaft 5 rotates. The variable mechanism 22 includes a roller guide 24 that is fixed to the rotating shaft 5 and forms a control surface 23 that gradually narrows outward in the radial direction of the rotating shaft 5 between the movable pulley half 2b and the movable pulley half 2b. It is constituted by a speed change roller 25 interposed between the roller guide 24 and the movable pulley half 2b. Then, the speed change roller 25 is moved toward the narrow part of the control surface 23 by the centrifugal force caused by the rotation of the rotating shaft 5.
The movable pulley half 2b is pressed and moved together with the movable face 18 toward the fixed pulley half 2a.

Furthermore, in this embodiment, a plurality of communication holes 26 are formed near the center of rotation of the movable pulley half 2b to communicate the ventilation passage 19 with the space in which the speed change roller 25 is installed. Further, a large number of fins 27 are provided radially on the side cover 9 of the fixed pulley half 2a, and a belt chamber B A ventilation hole 28 is formed that communicates the inside and outside of the housing.

The fixed pulley half 4a constituting the driven pulley 4 is attached to the rotating shaft 6 via a bearing 29 provided on the rotating shaft 6.
The drive belt 3 is attached to the drive belt 3 so as to be rotatable and restrained from moving in the longitudinal direction, and the side of the drive belt 3 that is opposite to the side of the drive belt 3 that is in contact with the fixed pulley half 2a of the drive pulley 2. It is designed to touch the side of the Further, the movable pulley half 4b disposed opposite to the fixed pulley half 4a forms a V-shaped winding surface A of the drive belt 3 with their opposing surfaces together with the fixed pulley half 4a. It is slidably attached to the half body 4a along the length direction of the rotating shaft 6. Further, between the fixed pulley half 4a and the rotating shaft 6, there is a clutch 3 consisting of a clutch outer 30a1, a clutch inner 30b, and a multi-plate plate 30c interposed between them. ), and a resilient member 31 is interposed between the clutch outer 30a and the movable pulley half 4b to constantly press the movable pulley half 4b toward the fixed pulley half 4a.

However, the transmission l of this embodiment having such a configuration cools the drive pulley 2 and the drive belt 3 by supplying cooling water through the cooling water supply pipe 12 as the engine rotates. I can do it.

That is, the cooling water supplied from the cooling water supply pipe 12 is
As shown by the arrow A in FIG.
After that, it is discharged to the outside. Due to this flow, the cooling water in a low temperature state is brought into contact with the vicinity of the rotation center of the fixed face 8, which is the location where the amount of heat generated is the largest.
Thereafter, the side cover 9 is brought into contact with the outer periphery of the fixed face 8, which generates a relatively small amount of heat, and the side cover 9, which is heated mainly by heat conduction from the fixed face 8, so that efficient heat exchange is performed.

On the other hand, in this embodiment, the ventilation passage 19 and the fins 27 are also rotated by the rotation of the drive pulley 2, and due to these rotations, the space C formed by the drive pulley 2 and the drive belt 3 and the speed change roller 25 are rotated.
The air in the space where the drive pulley 2 is installed is forcibly discharged to the outside of the drive pulley 2 through the ventilation passage 19 as shown by the arrow in FIG. Fresh air is sucked from the non-contact portion between the pulley 2 and the drive belt 3, and outside air is sucked into the belt chamber B through the ventilation hole 28.
The drive pulley 2 and the drive belt 3 are cooled more effectively by being stirred inside.

As described above, in this embodiment, the cooling fluid circulation path 7 is provided on the drive pulley 2 side, but this is because when the transmission 1 is in the reduction ratio, the winding radius of the drive pulley 2 and the drive belt 3 is Heat generation due to an increase in the amount of deformation of the drive belt 3 due to the small diameter, or heat generation due to biting, detachment, slipping, etc. between the drive pulley 2 and the drive belt 3 due to fluctuations in the input to the rotating shaft 5. The drive pulley 2 is higher than the driven pulley 4.
This is because efficient cooling can be obtained by providing it on the side.

The reason why the calorific value differs between both pulleys 2.4 is that when the input from the engine is transmitted to the driven pulley 4, fluctuations in the input are alleviated by the hysteresis of the drive belt 3. This is thought to be due to.

Next, an embodiment of the second invention will be described in detail based on FIG. 2. In the following description, the same reference numerals are used for parts common to the embodiment of the first invention described above to simplify the description.

First, an outline of one embodiment will be described. It includes a drive pulley 2 that is rotationally driven by an engine, and a driven pulley 4 that is rotationally driven via a drive belt 3 wound around the drive pulley 2. Each pulley2.
4 is a fixed pulley half 2a (4a) fixed to a rotating shaft 5 (6) that supports them, and a fixed pulley half 2a (4a) that is attached to the rotating shaft 5 (6) so as to be movable in the longitudinal direction thereof. The winding surface A of the drive belt 3 together with the body 2a (4a)
and a movable pulley half 2b (4b) forming a winding surface A of each fixed pulley half 2a (4a) of the drive pulley 2 and driven pulley 4. A cooling fluid circulation path 7 (32) for circulating cooling fluid from the vicinity of the rotation center of the fixed pulley half 2a (4a) toward the outer circumference is formed, and each fixed pulley half 2a (4a) is connected to the drive. The belt 3 is arranged so as to sandwich the belt 3 therebetween.

To explain these details, the drive pulley 2 has the same configuration as the first invention described above.

As described above, the fixed pulley half 4a constituting the driven pulley 4 is installed on the opposite side of the fixed pulley half 2a of the drive pulley 2 and the drive belt 3, and is another component. It includes a fixed face 33 that forms the winding surface A of the drive belt 3 in a V-shape together with the movable pulley half 4b, and the back side of the fixed face 33, that is, the side opposite to the side forming the winding surface A. 2nd on the side
On the right side in the figure, a side cover 34 is integrally provided that forms a sealed gap H between the fixed face 33 and the fixed face 33. A separator 35 is interposed between the side cover 34 and the fixed face 33, and the separator 35 sealingly divides the gap H into two to form divided chambers H1 and H2. A through hole 36 is provided to communicate the divided chambers H2 and H2. Further, a communication hole 37 is provided at the rotation center of the fixed pulley half 4a to expose the end of one of the divided chambers H on the rotation center side to the outer surface of the rotation shaft 6.

The other divided chamber H is located at the center of rotation of the side cover 34.
A through hole 38 communicating with the end on the rotation center side of the belt chamber B is formed between the peripheral edge of the through hole 38 and the inner wall surface of the belt chamber B. Mechanical seal 4 forming a cooling water discharge path 39 around 6
0 is inserted. The cooling water discharge passage 39 thus formed is communicated with a drainage hole 41 formed in the inner wall of the belt chamber B.

The rotating shaft 6 has one end that is connected to the belt chamber cover 13.
A cooling water supply hole 42 is bored in the center from the outwardly projecting end to the part where the fixed pulley half 4a is attached. It is set up.

The inner end of the cooling water supply hole 42 is communicated with the communication hole 37 provided in the fixed pulley half 4a, and the end protruding outward is provided with a cooling water supply hole (not shown). A water supply pump is installed.

Therefore, these cooling water supply holes 42, communication holes 37,
One divided chamber H1, the through hole 36, the other divided chamber H2, the cooling water drainage path 39, and the drainage hole 41 form the cooling water circulation path 32 on the driven pulley 4 side of this embodiment.

On the other hand, reference numeral 43 in FIG. 2 is a packing interposed between the stationary pulley half 4a and the rotating shaft 6 along the length direction of the rotating shaft 6 and sandwiching the communicating hole 37.

The belt automatic transmission l of this embodiment configured in this manner supplies cooling water to the drive pulley through the cooling water supply pipe 12 and the cooling water supply hole 42 bored in the rotary shaft 6. 2. The drive belt 3 and driven pulley 4 can be cooled.

That is, the drive pulley 2 is cooled in the same manner as in the first invention described above, and one side of the drive belt 3 is continuously cooled by cooling the diagnostic drive pulley 2. Regarding the driven pulley 4, the cooling water supplied from the cooling water supply hole 42 is supplied to the communication hole 3.
7 to the rotation center side of one of the divided chambers H1, and then moved toward the outer periphery of the divided chamber device as the driven pulley 4 rotates, and then flows from the through hole 36 to the other side. the belt chamber B via the cooling water discharge path 39 and the drain hole 41 from the rotation center of the divided chamber H2.
is discharged to the outside. Due to this flow of cooling water, similar to the cooling effect in the drive pulley 2 described above, the cooling water in a low temperature state is brought into contact with the vicinity of the rotation center of the fixed face 33, which is the location with the largest amount of heat generation, After that, the cooling water is brought into contact with the outer peripheral side of the fixed face 33, which generates a relatively small amount of heat, and the side cover 34, which is heated mainly by heat conduction from the fixed face 33, so that the driven pulley 4 is also efficient. Heat exchange takes place. Further, since the other side of the drive belt 3 is brought into contact with the driven pulley 4, the other side of the drive belt 3 is efficiently cooled. Furthermore, in this embodiment, the cooling water is supplied to the driven pulley 4 through the cooling water supply hole 42 provided in the rotating shaft 6 to which the driven pulley 4 and the clutch 30 are attached. The driven pulley 6 itself is also cooled to prevent heat conduction to other constituent members of the driven pulley 4.

Therefore, in this embodiment, both the drive pulley 2 and the driven pulley 4 are cooled, and the slag is removed from the main heat source in the belt chamber B,
Highly efficient cooling can be performed. Moreover, since both sides of the drive belt 3 are cooled by the fixed pulley half 2a of the drive pulley 2 and the fixed pulley half 4a of the driven pulley 4, the drive belt 3 can be uniformly cooled to reduce thermal stress. It is possible to effectively suppress the occurrence of such occurrences.

Note that the various shapes and dimensions of the constituent members shown in each of the above embodiments are merely examples, and can be variously changed based on design requirements and the like. For example, although an example is shown in which water is used as the cooling fluid, other fluids can be selected and used as appropriate. Further, the cooling water supply pipe 12 and the cooling water supply hole 42, which constitute a part of the cooling water supply means, are provided so as to penetrate the belt chamber cover 13, and furthermore, in order to form the cooling fluid circulation path 7.32, Mechanical seal 14.40 was used,
It is also possible to install it at any position depending on the type of cooling fluid used, and to use other seal structures.

"Effects of the Invention" As explained above, the belt automatic transmission according to the present invention provides the following excellent effects.

According to the first invention, since a cooling fluid circulation path is formed in the drive pulley or the fixed pulley half constituting the driven pulley, which circulates the cooling fluid from the vicinity of the rotation center toward the outer circumference, the temperature is low. The cooling fluid is brought into contact with the area near the center of rotation of the stationary pulley half, which generates the largest amount of heat, and then brought into contact with the outer periphery of the stationary pulley half, where the amount of heat is relatively low, for efficient heat exchange. can be carried out. As a result, deterioration of the drive belt can be suppressed and durability can be improved.

Further, according to the second invention, the fixed pulley half of the drive pulley and the fixed pulley half of the driven pulley are arranged on both sides of the drive belt, and a cooling fluid circulation path is formed in each fixed pulley half. From the above-mentioned first
In addition to the effects of the invention, by cooling the drive belt from both sides thereof, the drive belt can be cooled uniformly and the generation of thermal stress in the drive belt can be minimized.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a main part of an embodiment of the first invention, and FIG. 2 is a diagram similar to FIG. 1 showing an embodiment of the second invention. 1... Transmission, 2... Drive pulley, 2a. 4a... Fixed pulley half, 2b, 4b... Movable pulley half, 3... Drive belt, 4... Driven pulley, 5.6... Rotating shaft, 7.32... Cooling Fluid circulation path, 8.33...Fixed face, 9.34...
Side cover, 10.35... Separator, A...
・Wound surface, B...Belt chamber, G, H...Gap, G1
, G2, old, I (2... divided room.

Claims (2)

[Claims] (1) A drive pulley that is rotationally driven by an engine, and a driven pulley that is rotationally driven via a drive belt wound around the drive pulley, and each of the pulleys is attached to a rotating shaft that supports them. It consists of a fixed pulley half and a movable pulley half that is attached to the rotary shaft so as to be movable in its longitudinal direction and forms a winding surface of the drive belt together with the fixed pulley half, and
On the side opposite to the surface forming the winding surface of the fixed pulley half,
A belt automatic transmission characterized in that a cooling fluid circulation path is formed for circulating cooling fluid from the vicinity of the rotation center of the fixed pulley half toward the outer periphery. (2) A drive pulley that is rotationally driven by an engine and a driven pulley that is rotationally driven via a drive belt wound around the drive pulley, and each of the pulleys is attached to a rotating shaft that supports them. It consists of a fixed pulley half and a movable pulley half that is attached to the rotary shaft so as to be movable in its longitudinal direction and forms a winding surface of the drive belt together with the fixed pulley half, and
A cooling fluid circulation path for circulating cooling fluid from near the rotation center of the fixed pulley half toward the outer periphery on the opposite side to the surface forming the winding surface of each of the fixed pulley halves of the drive pulley and the driven pulley. As well as forming respectively,
A belt automatic transmission characterized in that each fixed pulley half is arranged to sandwich the drive belt.