JPS63140151A - Belt type continuously variable transmission - Google Patents

Abstract

PURPOSE:To make a device compact through shortening the full length of the device by making the shaft portion of a movable pulley extrude toward a fixed pulley. CONSTITUTION:On the front-end side of the spline shaft 35 of two shafts 1 arranged in parallel, is arranged the boss portion 36 of a fixed pulley 3b likewise put on the drive shafts 1. At the fixed pulley 3b, is provided a recessed portion 38 which enters recessedly in face of an opposing movable pulley 4b, and the front-end portion of the spline shaft 35 is inserted into this recessed entrance portion 38. At a movable pulley 4b, is formed a tube-shaped shaft portion 40 extruding toward the opposing fixed pulley 3b. The spline portion 41 of the front-end part of this tube-shaped shaft portion 40 and the spline portion 42 of the front-end part of said spline shaft 35 are engaged to each other. Thus, by making a pulley unit having a movable pulley a cantilever structure, miniaturization can be realized through shortening the full length.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a belt type continuously variable transmission.

BACKGROUND ART AND PROBLEMS THEREOF FIG. 3 is a schematic diagram showing the general structure of this type of belt type continuously variable transmission. In the figure, (1) indicates a drive shaft rotatably supported by a bearing case (2) arranged at one end, and this drive shaft (1) has a fixed pulley ( 3a) and its fixed pulley (3
A drive pulley unit (5) is provided, which includes a movable pulley (4a) that is attached to the drive pulley so that it can move forward and backward in the axial direction with respect to a). In this drive pulley unit (5),
Movable pulley (4a) facing the bearing case (2)
is located.

Further, the drive shaft (1) is provided with an engagement/disengagement clutch (7) equipped with a driven gear (6) within the above-mentioned bearing case (2), and an input shaft connected to the engine (8). (9)
An intermediate gear (11) meshing with the driving gear (10) is meshingly connected to the driven gear (6). That is,
The rotational power generated in the engine (8) is transmitted to the driven gear (6) via the driving gear (10) and the intermediate gear (11).
), and by connecting the engagement/disengagement clutch (7), the drive shaft (1) is rotated.

On the other hand, (12) indicates a driven shaft that is rotatably supported by another bearing case (13) located at approximately the same position as the bearing case (2), and this driven shaft (12)
Also, a driven pulley (16) is provided which includes a fixed pulley (14) fixed on the shaft and a movable pulley (15) attached to the fixed pulley (14) so as to be able to move back and forth in the axial direction. There is. The fixed pulley (14) in this driven pulley unit (16)
and a V-groove (17) formed between the movable pulley (15)
), and the Vlg (18) formed between the fixed pulley (3a) and the movable pulley (4a) in the drive pulley unit (5) has an endless belt (19) wrapped around them. is located. That is, the drive pulley unit (5), the +& dynamic pulley unit (16), and the endless bell l- (19) constitute a belt type continuously variable transmission mechanism (20). Then, using the endless heddle (19) as a reference, move the movable pulley (4a
) (15) and the fixed pulleys (3a) and (14) are placed on opposite sides of each other, so that the endless belt can be moved forward and backward by the movable pulley (4a) relative to the fixed pulley (3a) in one drive pulley unit (5). (
19) and the other driven pulley unit (16).
) Fixed pulley for (14) Movable pulley for (14)
(15) The endless bell due to the forward and backward movements)' is made to match the position of (19). Furthermore, this third
In the conventional example shown in FIG.
), and a pulley (22) provided between the external bearing (21) and the bearing case (13) extracts the rotary power that is continuously variable in speed by the belt type continuously variable transmission mechanism (20). It looks like this.

By the way, in the driving pulley unit (5) and the driven pulley unit (16), the movable pulleys (4a) and (15) move back and forth in the axial direction, as described above. Therefore, conventionally, taking the drive pulley unit (5) as an example, the movable pulley (4a) was attached to the drive shaft (1) as shown in FIG. 4.

In FIG. 4, (23) indicates a spline shaft externally fitted onto the drive shaft (1) protruding from the bearing case (2);
A fixed pulley (3a), which is also fitted onto the drive shaft (1), is disposed on the front end side of the spline shaft (23). These fixed pulley (3a) and spline shaft (23) are fixed to the drive shaft (1) by a key (24).

On the other hand, the movable pulley (4a) is provided with a cylindrical shaft portion (25) that protrudes toward the side opposite to the fixed pulley, and a spline portion (26) provided on the inner peripheral surface of the cylindrical shaft portion (25). but,
A spline portion (
27).

The movable pulley (4a) also includes a skirt portion (28) that similarly protrudes toward the side opposite to the fixed pulley, and the cylindrical shaft portion (25).
), and an oil passage (31) of an oil-tight member (30) externally fitted and fixed to the drive shaft (1) so as to close the skirt portion (28). ) via
A hydraulic oil passage (32) provided in the drive shaft (1) and the hydraulic pressure chamber (29) are communicated with each other. That is, by changing the hydraulic pressure in the hydraulic pressure chamber (29), the movable pulley (4a) moves back and forth in the axial direction within the range of the spline section (27) provided on the spline shaft (23). , to rotate integrally with the drive shaft (1).

In this case, since the movable pulley (4a) of the drive pulley unit (5) has its cylindrical shaft portion (25) protruding toward the side opposite to the fixed pulley, the bearing case (2) and the drive pulley unit (5) ), the distance from the vl center inevitably becomes longer. Therefore, conventionally, an external bearing (33) is provided which is located on the opposite side of the bearing case (2) across the drive pulley unit (5).
) and the bearing case (2) to support the drive shaft (1) on both sides.

However, in that way the drive shaft (1) is connected to the external bearing (3).
3) is used to support the device on both ends, the overall length inevitably increases, which not only increases the size of the entire device, but also requires external bearings (3).
3) The problem was that the cost would be higher as the equipment was equipped. Moreover, when replacing the belt, the external bearing (33)
After removing the drive pulley unit (5), the drive pulley unit (5) must be disassembled, making it difficult to replace the belt, which also poses a problem in terms of maintainability.

Furthermore, as in this conventional example, the bearing case (2) that supports the drive shaft (1) and the bearing case (13) that also supports the driven wheel (12) are approximately the same due to the overall arrangement etc. When the fixed pulley (14) of the driven pulley unit (16) and the fixed pulley (14) of the driven pulley unit (16) are There is a dead space between the bearing case (13) and the gap between the V-groove center of the wave pulley unit 7) (16) and the bearing case (13) becomes longer due to the dead space. There is an inconvenience in that it must necessarily be supported on both sides using external bearings (34).

Means for Solving the Problems In view of the above-mentioned problems, the present invention provides a system in which the pulley unit 7 constituting the heald 2 continuously variable transmission mechanism is supported on both sides in this type of heald type continuously variable transmission. This was done with the aim of making it possible to support the government without having to do anything.

Technical means for achieving such an object will be explained using FIG. 1, which corresponds to one embodiment of the present invention. That is, in this invention, two shafts (1) arranged in parallel
Fixed pulley (3b) fixed on the shaft in (12)
(14) and a movable pulley that moves back and forth in the axial direction (4b)
(15) and pulley units (5) and (16) are provided respectively, and their respective pulley units (5) and (16) are provided.
(16) An endless bell) (19) is wound between the belt type continuously variable transmission mechanism (20), and the movable pulley
(4b) In the device in which the speed is changed by moving the (15) forward and backward, the pulley unit (5)
The movable pulley (4b) constituting the
(4b) on the shaft (1) is provided to protrude toward the opposing fixed pulley (3b).

In other words, since the shaft (40) of the movable pulley (4b) protrudes toward the opposing fixed pulley (3b), these movable pulleys (4b) and fixed pulleys (3b)
), the center of the V-groove located between the movable pulley (4b) and the fixed pulley (3b) approaches the bearing part of the case, etc., which is generally located on the side opposite to the fixed boolean. Become.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 2 shows a schematic diagram of a belt type continuously variable transmission having a similar arrangement to the conventional example shown in FIG. Therefore, in the following description, the symbols used in the conventional example in FIG. 3 will be used in common unless changes are required.

That is, as shown in FIG. 2, the drive pulley unit (5) constituting the Held type continuously variable transmission mechanism (20) is supported by the drive shaft (1) that protrudes forward from the bearing case (2). An endless heald (19) is wound around the lug (18) between the fixed pulley (3b) and the movable pulley (4b) in the drive pulley unit (5), and the driven pulley (16) is Bearing case (13) located at approximately the same position as bearing case (2)
) is supported by a driven shaft (12) that projects forward in parallel to the drive shaft (1), and is supported by a fixed pulley (14) in this driven pulley unit (16).
An endless belt (19) is also wound around the V-groove (17) between the movable pulley (15) and the movable pulley (15).

In this embodiment as well, the above drive pulley unit (5
) is arranged facing one bearing case (2), and the fixed pulley (14) in the other driven pulley (16) is arranged facing the other bearing case (L3). are placed facing each other.

Therefore, in this embodiment, the drive pulley unit (5) of Ti7 has a structure as shown in FIG. That is, in FIG. 1, (35) indicates a spline shaft fitted onto the drive shaft (1) protruding from the bearing case (2), and a drive shaft is also attached to the front end side of this spline shaft (35). The boss part (
36) are arranged, and these fixed pulleys (3b
) and the spline shaft (35) are fixed to the drive shaft (1) via a key (37). The fixed pulley (3b) has an opposing movable pulley (4
b) A recessed portion (38) is provided, and the front end portion of the spline shaft (35) is inserted into the recessed portion (38).

Further, an oil-tight wall (39) vertically raised toward the side of the drive shaft (1) is integrally formed at the rear end portion of the spline shaft (35). Its oil-tight walls (
39) is arranged close to the bearing case (2). Note that (80) indicates a bearing provided in this bearing case (2) on the side of the drive pulley unit (5), and like this bearing (80), the other end of the bearing case (2) The drive shaft (1) is rotatably supported by another bearing (not shown) arranged on the side.

Next, the movable pulley (4b) has a cylindrical shaft portion (40) that protrudes toward the opposing fixed pulley (3b).
) is formed. The outer diameter dimension of this cylindrical shaft portion (40) is slightly smaller than the diameter of the recessed portion (38). A spline portion (41) is provided on the inner peripheral portion of the front end portion of the cylindrical shaft portion (40), and this spline portion (41) and the front end portion of the spline shaft (35) Spline part (42) provided in
are engaged with each other. Further, the outer circumferential surface (40a) of the cylindrical shaft portion (40) and the side wall surface (38) of the recessed portion (38)
a) are in sliding contact with each other. (43)
shows an oil-tight ring attached to the outer circumferential surface (40a) of the cylindrical shaft portion (40) so as to contact the side wall surface (38a) of the recessed portion (38).

On the other hand, a skirt portion (45) that slides into contact with the flange portion (44) provided on the oil-tight wall (39) is provided on the outer peripheral portion of the movable pulley (4b), protruding toward the side opposite to the fixed pulley. , also in this case, the skirt part (45
) An oil-tight ring (46) that contacts the inner circumferential surface is attached to the flange (44).

In addition, on the back side of the movable pulley (4b), there is a rear part of the spline shaft (35) and an oil-tight wall (39) continuous thereto.
) is formed with an operating hydraulic pressure chamber (47). The hydraulic pressure chamber (47) is connected to a hydraulic oil passage (49) provided in the drive shaft (1) via an oil passage (48) provided in an intermediate portion of the spline shaft (35).

Also in this case, the one bearing case (
Driven gear (6) of the engaging/disengaging clutch (7) built into 2)
The drive gear (10) of the input shaft (9) is meshed with and connected to the input shaft (11) via the halftone gear (11), and the input shaft (
The engine (8) is connected to the engine (9). Therefore, by connecting the engaging/disengaging clutch (7), the engine (
The rotational power of 8) is input to the drive shaft (1).

Further, the other end side of the driven shaft (12) that penetrates the other bearing case (13) and protrudes rearward is also supported by the external bearing (21) in this case.
) and the bearing case (13) are provided with a pulley (22).

That is, when the hydraulic pressure in the hydraulic pressure chamber (47) provided in the drive pulley unit (5) is increased, the movable pulley (4b) moves toward the fixed pulley (3b).
To the recessed part (38) provided in the fixed pulley (3b),
The cylindrical shaft (40) of the movable pulley (4b) enters, thereby increasing the rotation radius of the endless belt (19). On the other hand, in (16),
The movable pulley (15) is pushed by the endless belt (19), and the fixed pulley (14) is pushed against the return spring (50).
), the drive pulley unit (5)
The rotation radius of the endless bell (19) decreases, and the number of revolutions of the driven shaft (12) increases. . Furthermore, when the hydraulic pressure in the hydraulic pressure chamber (47) is reduced, the movable pulley (15) of the driven pulley unit (16) is pushed back by the return spring (50) and moves toward the fixed pulley (14). At the same time, in the drive pulley unit (5), the movable pulley (4b) is pushed by the endless belt (19), and the fixed pulley (3
b) in the direction away from the driven pulley unit (16
) will be moved by an amount that substantially cancels out the amount of movement of the movable pulley (15) at ), so in this case, the number of rotations of the driven shaft (12) will decrease. In this way, the pulley (22) provided on the driven wheel (12)
), steplessly variable speed rotational power is extracted.

In this way, one bearing case (2
), the movable pulley unit (5) has a movable pulley (4b) arranged facing the movable pulley (4b).
By providing a cylindrical shaft portion (35) for supporting the movable pulley (4b) on the drive shaft (1) so as to protrude toward the fixed pulley (3b), the shaft portion supports the movable pulley (4b). It is no longer necessary to make it protrude toward the opposite side of the fixed boot as in the conventional case.

Therefore, the groove part (1) in the drive pulley unit (5) is located on the opposite side of the fixed pulley, in this case, the bearing case (
2), which allows the drive pulley unit (5) to have a cantilever support structure.

Further, as in this embodiment, the other bearing case (13) supporting the driven shaft (12) is connected to the one bearing case (13).
2) To bring the v/a portion of the drive pulley unit (5) closer to its bearing case (2) as described above, even if it is placed on the same side as the drive pulley unit (5).

Therefore, by moving the fixed pulley (14) facing the bearing case (13) closer to the bearing case (13) in the driven pulley unit (16), the dead space can be reduced. In the same way, attach the V1 part of the driven pulley unit (16) to the bearing case (13).
This means that the driven pulley unit (16) can be supported in a cantilevered manner by moving it closer to a bearing (not shown) provided in the figure.

Effects of the Invention As described above, in this invention, the movable pulley constituting the pulley unit is provided with a shaft portion for supporting the movable pulley that protrudes toward the opposing stationary pulley, thereby improving the efficiency of the present invention. Since there is no need to provide a shaft part on the movable pulley that protrudes toward the side opposite to the fixed pulley, the center of the groove in the pulley unit can be placed on the pulley unit side in cases, etc., which is generally provided on the side opposite to the fixed pulley. It becomes possible to make the pulley unit having the movable pulley into a cantilevered structure by moving it closer to the part, etc.
Not only can the overall length of the entire device be shortened to make it more compact, but it also has the advantage of reducing costs because it does not require external bearings like conventional ones. Moreover, since the cantilever support structure can be used, there is an advantage that the endless heald can be replaced easily.

In particular, as shown in the example, the case where the case supporting the drive-side shaft and the case supporting the driven-side shaft must be placed at approximately the same position due to the overall arrangement, etc. By applying this invention, there is an advantage that the dead space formed between the fixed pulley of the pulley unit and the case is reduced on the driven side as well.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of essential parts showing an embodiment of the present invention;
FIG. 2 is a schematic overall layout of a belt-type continuously variable transmission to which the present invention is applied, FIG. 3 is a schematic overall layout of a conventional belt-type continuously variable transmission of this type, and FIG. 4 is the same FIG. 2 is an enlarged cross-sectional view of a main part of an example of a conventional pulley unit. (1)...Drive shaft, (3b)...Fixed pulley of drive shaft, (4b)...Movable pulley of drive shaft, (5)...Drive pulley unit, (40)...Movable The cylindrical shaft of the pulley.

Claims (1)

[Claims] Two shafts arranged in parallel are each provided with a pulley unit including a fixed pulley fixed on the shaft and a movable pulley that moves back and forth in the axial direction, and an endless system is provided between the pulley units. A belt-type continuously variable transmission mechanism is constructed by wrapping a belt around the
In the device in which the speed is changed by moving the movable pulley forward and backward, the movable pulley constituting the pulley unit has a shaft portion for supporting the movable pulley on the shaft toward the opposing fixed pulley. A belt-type continuously variable transmission characterized by being provided protrudingly.