JPS6238041Y2 - - Google Patents

Description

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

For example, as a conventional V-belt continuously variable transmission,
There is something like the one shown in the figure. This V-belt type continuously variable transmission 1 includes a driving pulley 4 and a driven pulley 5 provided on a driving shaft 2 and a driven shaft 3, respectively, arranged in parallel, and a V-belt wound around both pulleys 4 and 5. It consists of a belt 6. Drive pulley 4
is a fixed conical plate 4a fixed to the drive shaft 2;
It is arranged opposite to the fixed conical plate 4a to form a V-shaped pulley groove and a driving pulley cylinder chamber 4c.
The movable conical plate 4b is movable in the axial direction on the drive shaft 2 by the hydraulic pressure applied to the drive shaft 2. The driven pulley 5 has a fixed circular plate 5a fixed to the driven shaft 3 and a V-shaped pulley groove formed by opposing the fixed circular plate 5a, and is driven by the hydraulic pressure acting on the driven pulley cylinder chamber 5c. Axis 3
It consists of a movable conical plate 5b that can be moved on top. The rotation ratio between the drive shaft 2 and the driven shaft 3 of such a V-belt type continuously variable transmission 1 is determined by the thrust force acting on the movable conical plate 4b due to the hydraulic pressure in the drive pulley cylinder chamber 4c and the driven pulley cylinder chamber. It is determined according to the comparison with the thrust force acting on the movable conical plate 5b due to the hydraulic pressure in 5c. In other words, the radius of the contact position of the pulley on the side with a larger thrust with the V-belt 6 becomes larger, and the radius of the contact position with the V-belt 6 of the pulley on the side with a smaller thrust becomes smaller. Therefore, by controlling the oil pressure in the driving pulley cylinder chamber 4c and the driven pulley cylinder chamber 5c, the rotation ratio can be changed continuously.

However, in the case of the conventional V-belt type continuously variable transmission as described above, power transmission between both pulleys was possible only via the V-belt.
There was a problem in that if the belt broke, power transmission would be completely impossible. When such a V-belt type continuously variable transmission is used in an automobile or the like, if the V-belt breaks, the vehicle becomes unable to run, which can be extremely dangerous under certain circumstances.

The present invention was developed by focusing on the above-mentioned problems in conventional V-belt type continuously variable transmissions, and allows power to be transmitted between both pulleys not only by the V-belt but also by gears. This aims to solve the above problems.

Hereinafter, the present invention will be explained based on FIGS. 2 to 7 of the accompanying drawings showing embodiments thereof.

FIG. 2 shows a first embodiment of the present invention. A V-belt 13 is wound around a driving pulley 11 and a driven pulley 12 with variable V-groove intervals. Although both pulleys 11 and 12 are shown schematically, the V-groove spacing can be varied by hydraulic pressure, similar to that shown in FIG. Gears 11a and 12a are provided on the outer peripheries of both pulleys 11 and 12, respectively. Since the distance between the axes of both pulleys 11 and 12 is larger than the pulley outer diameter, gear 11a and gear 12a do not mesh with each other. Both pulleys 11
and 12 vertically between the rotation axes 11b and 12b.
A shaft 15 is supported by a linear motion bearing 14 so as to be movable on an equal dividing line. A connecting gear 16 is rotatably supported at the tip of the shaft 15.
One end of an operating lever 18 is connected to approximately the center of the shaft 15 by a pin 17. The operating lever 18 is swingably supported by a pin 19 at its center, and has a grip 20 at the other end.
is installed.

Next, the effect will be explained.

In a normal state where the V-belt 13 is not cut, the shaft 15 and the connecting gear 16 are in the state shown in FIG. 2, and the connecting gear 16 is in the state shown in FIG.
It doesn't mesh with a. Therefore, power is transmitted between both pulleys 11 and 12 via the V-belt 13 as usual. If the V-belt 13 breaks, operation can be continued by operating the operating lever 18. That is, the actuating lever 18 is rotated counterclockwise in the figure with the pin 19 as a fulcrum, the shaft 15 is moved to the right, and the coupling gear 16 is engaged with both gears 11a and 12a. With this, the gears 11a, 12a
and both pulleys 11 and 1 via the connecting gear 16.
Power transmission between the two becomes possible. Both pulleys 11 and 12 rotate in the same direction at the same rotational speed. Therefore, in the case of a car or the like, it is possible to drive the vehicle to a repair shop on an emergency basis.

A second embodiment of the present invention is shown in FIGS. 3-6. A V-belt 33 is attached to the driving pulley 31 and the driven pulley 32.
is wrapped around it. The drive pulley 31 is connected to the drive shaft 3
A fixed conical plate 35 fixed to 4 and a drive shaft 34
and a movable conical plate 36 that rotates together with the movable conical plate 36 but is movable in the axial direction. Note that the movable conical plate 36 is rotatably supported by a pulley guide 37 that does not rotate. The fixed conical plate 35 is
It has a gear 35a on its outer periphery. Similarly, the driven pulley 32 has a driven shaft 38 and a fixed conical plate 3.
9. It is composed of a movable conical plate 40 and a pulley guide 41. The movable conical plate 40 has a gear 40a on its outer periphery. A shaft 42 extending parallel to the drive shaft 34 and the driven shaft 38 is supported by bearings 43 and 44 so as to be movable in the axial direction and rotatable. A stopper 42a is provided at one end of the shaft 42 to prevent the shaft 42 from moving beyond a predetermined value. The shaft 42 has a connecting gear 4 that can mesh with both gears 35a and 40a.
5 is fixed. The shaft 42 also has a pin 5.
A member 46 having a number 3 is fixed thereto. Two links 47 and 48 are rotatably attached to the pulley guide 37 at the illustrated positions by pins 49 and 50, respectively. A long hole 47a provided at one end of the link 47 is connected to a pin 5 fixed to the pulley guide 37.
It fits in with 1. A pin 52 is fixed to the other end of the link 47, and this pin 52
It fits into the elongated hole 48a at one end of 8. The distance between the pin 49 and the elongated hole 47a is greater than the distance between the pin 49 and the pin 52. A long hole 48b at the other end of the link 48 fits into a pin 53 fixed to the member 46. The distance between the pin 50 and the elongated hole 48b is the same as the distance between the pin 50 and the elongated hole 48a.
It is made larger than the distance between the two.

Next, the effect will be explained.

FIG. 3 shows a state in which the continuously variable transmission has the largest reduction ratio. That is, the distance between the V-shaped grooves of the driving pulley 31 is at its maximum, and the interval between the V-shaped grooves of the driven pulley 32 is at its minimum. In this state,
Both the movable conical plate 36 and the movable conical plate 40 are moving to the right in FIG.
8 is in the state shown in the figure, and the connecting gear 45 fixed to the shaft 42 whose position is determined by the links 47 and 48 is meshed with the gear 35a (the gear 40a has moved to the right). (They don't mesh because there are some.) Therefore, power transmission between both pulleys 31 and 32 is performed via the V-belt 33.

FIG. 4 shows a state where the reduction ratio of the continuously variable transmission is 1. That is, the interval between the V-shaped grooves on the driving pulley 31 and the interval between the V-shaped grooves on the driven pulley 32 are equal. In this state, the movable conical plate 36 and the movable conical plate 40 are aligned with the fixed conical plate 39 and the fixed conical plate 35, respectively, and the link 4
7 and 48 are in the state shown, and these links 47,
The connecting gear 45 fixed to the shaft 42 whose position is determined by 48 is in a position where it does not mesh with both gears 35a and 40a. Therefore, both pulleys 31
and 32 is transmitted via a V-belt 33.

FIG. 5 shows a state where the reduction ratio of the continuously variable transmission is the smallest. In other words, the distance between the V-shaped grooves of the driving pulley 31 is the minimum, and the distance between the V-shaped grooves of the driven pulley 32 is the maximum. In this state,
Both the movable conical plate 36 and the movable conical plate 40 are moving to the left in FIG.
8 is in the illustrated state, and the connecting gear 45 fixed to the shaft 42 whose position is determined by the links 47 and 48 is in a position where it does not mesh with the gears 35a and 40a. Therefore, both pulleys 31 and 3
Power transmission between the two is performed via a V-belt 33.

As described above, in the normal state where the V-belt 33 is not cut, the coupling gear 45 does not mesh with both gears 35a and 40a at the same time over the entire range of reduction ratios. Therefore, normal operation can be performed.

Next, a case where the V-belt 33 is cut will be explained. FIG. 6 shows a state in which the V-belt 33 has been cut and has come off. In this case, since the V-belt 33 is not present, there is no reaction force opposing the hydraulic thrust of the movable conical plates 36 and 40, and the movable conical plates 36 and 40 are positioned closest to the fixed conical plates 35 and 39. Being pushed. In this state, the links 47 and 48 are in the state shown, and the coupling gear 45 meshes with both gears 35a and 40a. Therefore, both pulleys 3 are connected via the connecting gear 45.
Power transmission is possible between 1 and 32. Both pulleys 31 and 32 rotate in the same direction at the same rotational speed. Therefore, in the case of a car or the like, it is possible to drive the vehicle to a repair shop on an emergency basis.

FIG. 7 shows a third embodiment of the present invention. In the above-mentioned embodiment, the movement of the movable conical plate accompanying the cutting of the V-belt was used to move the connecting gear mechanically by the link device, but the cutting of the V-belt could be electrically moved. It is also possible to detect. That is, the fact that the movable conical plates 36 and 40 are closest to the fixed conical plates 35 and 39 is detected by the switches 62 and 64 operated by the levers 61 and 62 provided on the pulley guides 37 and 41, and both switches are activated. When gears 63 and 64 are turned on, the control device 65 may operate the motor 66 to move the coupling gear 45 to a position where it meshes with the gears 35a and 40a.
Note that the coupling gear may be moved using a hydraulic device.

As explained above, according to the present invention, V
A V-belt type continuously variable transmission that transmits power by wrapping a V-belt around a drive pulley and a driven pulley with variable groove spacing has a gear that rotates integrally with the drive pulley and the driven pulley, and a position where both gears mesh. and a connecting gear that is movable between at least one of the gears and a position where it is in a non-meshing state, so even if the V-belt breaks, it is possible to temporarily transmit power through the gear. .

Furthermore, according to the second and third embodiments of the present invention,
In the V-belt type continuously variable transmission, disconnection of the V-belt is detected by detecting that the V-groove spacing between both pulleys is at its smallest, and the connecting gear is activated only when the above-mentioned condition is detected. We installed a device to move it to a position where it meshes with both gears, so
When the V-belt breaks, the connecting gears automatically engage, allowing power transmission.

[Brief explanation of the drawing]

Figure 1 is a diagram showing a conventional V-belt type continuously variable transmission, Figure 2 is a diagram showing a V-belt type continuously variable transmission according to the present invention, and Figures 3 to 6 are diagrams showing a V-belt type continuously variable transmission according to the present invention. (Figure 3 is a diagram showing a state where the reduction ratio is large, Figure 4 is a diagram showing a state where the reduction ratio is 1, Figure 5 is a diagram showing a state where the reduction ratio is 1,
FIG. 6 shows a state where the reduction ratio is small, FIG. 6 shows a state where the V-belt is cut), and FIG. 7 shows another V-belt type continuously variable transmission according to the present invention. 11... Drive pulley, 11a... Gear, 12...
... Driven pulley, 12a ... Gear, 13 ... V-belt, 15 ... Shaft, 16 ... Connection gear, 18 ...
Operating lever, 31... Drive pulley, 32... Driven pulley, 33... V belt, 34... Drive shaft, 3
5... Fixed conical plate, 35a... Gear, 36...
Movable conical plate, 37...Pulley guide, 38...
Driven shaft, 39... Fixed conical plate, 40... Movable conical plate, 40a... Gear, 41... Pulley guide, 42... Shaft, 45... Connection gear, 47, 4
8...Link, 63, 64...Switch, 66...
…motor.

Claims (1)

[Scope of Claim for Utility Model Registration] In a V-belt continuously variable transmission that transmits power by winding a V-belt around a drive pulley and a driven pulley with variable V-shaped groove intervals, the drive pulley and the driven pulley each rotate integrally. A connecting gear capable of meshing with both gears is provided, and the connecting gear is movable between a position where both gears mesh simultaneously and a position where it is in a non-meshing state with at least one of the gears. A V-belt continuously variable transmission featuring