JPS6349110B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a forward/reverse belt transmission with a belt clutch suitable for use in drive devices for automobiles, motorcycles, transporters, agricultural machinery, etc.

Generally, in the case of an engine drive, the direction of rotation of the engine is constant, and a gearbox is required to move the car forward and backward, and when driving, it is necessary to switch between forward and reverse gears, which causes operational inconvenience. had.

Therefore, various studies have been conducted on other methods to replace such gear switching, and the configurations of various speed change pulleys have been studied, and some of them have been proposed by the applicants of the present invention. . For example, the basic method is to sandwich a V-belt between a pair of V-shaped variable speed pulley pieces, and use the pressing force of a spring against the side of the belt to prevent one or both pulley pieces from idling in the direction of rotation of the shaft. A spline or keyway is formed in the thrust direction so that one or both pulley pieces can move.

The present invention aims to improve the drawbacks of the conventional method of changing gears using such a speed change pulley, and provides a belt clutch method that allows the vehicle to be continuously operated forward and backward without using gears. The purpose is to

Therefore, for this purpose, the present inventor first used the above-mentioned variable speed pulley as a basis for both the driving pulley and the driven pulley, and while the boss part of the movable V pulley piece of the driving pulley was rotating, the V groove width was changed by an external force. A movable V pulley piece is provided to be able to slide in the axial direction with respect to a boss part extending in the axial direction of a fixed V pulley piece fixed to the shaft as a drive side pulley. Pulley piece and movable V
A radial bearing is attached to the boss part of the fixed V-pulley piece at the bottom of the V-groove of the speed change pulley formed by the pulley piece, and a spring is inserted between the movable V-pulley and a stopper fixed to one side of the movable V-pulley. A pulley in which a clutch plate is provided on the boss part of the V pulley piece, and the V pulley having the clutch plate facing the clutch plate is fixed to the boss part extending in the axial direction of the fixed V pulley piece via a bearing. On the other hand, a fixed V pulley piece and a V pulley corresponding to the V pulley of the driving pulley are provided on the shaft as a driven pulley, and the fixed V
A movable V-pulley piece movable in the axial direction is provided opposite to the pulley piece, and the fixed V-pulley piece and the movable V-pulley piece form a variable speed pulley, and the movable V-pulley piece and a stopper fixed to one side of the pulley are provided. Using pulleys with springs inserted between them, the transmission pulleys are connected parallel to each other, and the V pulleys are cross-connected between the corresponding speed change pulleys and the driven pulleys. A configuration in which the forward and reverse belt speeds can be changed by hanging the belt and changing the speed change pulley V groove width of the driving pulley using an appropriate external force, and by partially improving the above-mentioned proposed device, the speed change of the driven pulley is realized. V the pulley
Instead of a pulley, an inner or outer tension pulley is placed on the parallel belt so that tension is constantly applied to the belt, and tension is constantly applied to the belt in response to changes in the belt effective diameter of the speed change pulley on the drive side. We proposed a belt forward/reverse transmission with the following configuration.

The present invention further extends the above proposal and provides other means suitable for automatically following changes in belt effective diameter of the speed change pulley width and absorbing changes in winding length as a series of the above devices. The purpose of this invention is to improve the configuration of a V-pulley for reverse rotation provided on the drive pulley.

That is, the present invention provides the belt forward/reverse transmission device according to the above proposal, that is, a movable V-pulley piece is provided to be slidable in the axial direction with respect to the boss portion extending in the axial direction of the fixed V-pulley piece fixed to the shaft, Fixed V pulley piece and movable V
A radial bearing is attached to the boss part of the fixed V pulley piece at the bottom of the V groove of the speed change pulley formed by the pulley piece, and a spring is inserted between the movable V pulley piece and a stopper fixed to the side of the pulley. At the same time, a friction plate is provided protruding from the boss portion of the movable V-pulley piece, and a cylindrical body that applies a force from the outside via a bearing is attached to the boss portion between the friction plate and the movable V-pulley piece. In a device in which a pulley is a driving pulley and a belt is suspended between the pulley and a driven pulley provided correspondingly, the friction plate opposite to the friction plate of the movable V-pulley piece is On one side of the pulley, the drive side pulley is provided on the drive shaft via a bearing so as to be rotatable freely, a gear is integrally mounted on the friction plate, and an internal gear meshes with the gear via an idle gear. A pulley is integrally provided on a part of the outer periphery of the internal gear to serve as a reverse rotation pulley, and a pulley coaxial with the driven pulley provided corresponding to the driving pulley is provided. One more
The present invention is characterized by the configuration of a belt forward/reverse transmission in which a belt is suspended between two driven pulleys.

Hereinafter, specific embodiments of the device of the present invention will be described in detail based on the accompanying drawings.

1 to 4 are schematic diagrams of the device of the present invention in each state, and FIG.
Figure 2 shows the vehicle when running at medium to low speeds, Figure 3 shows the vehicle when the clutch is off (OFF), and Figure 4 shows the vehicle when driving in reverse.

In each of these figures, A is a drive pulley, which is slidable in the axial direction with respect to the fixed V-pulley piece 1 fixed to the shaft S ₁ and the boss portion 1a extending in the axial direction of the fixed V-pulley piece 1. A variable speed pulley V 1 is provided with a movable V pulley piece ₂ provided on the drive side pulley A, and a variable speed pulley V 1 is formed by a fixed V pulley piece 1 and a movable V pulley piece 2 of the variable speed pulley on the drive side pulley A.
A radial bearing 6 such as a ball bearing or a flat bearing is attached to the boss portion 1a of the fixed V-pulley piece 1 at the bottom of the groove, and a spring provided at the end of the boss portion 2a of the movable V-pulley piece 2 is attached to the bottom of the groove. A spring 7 is inserted between the presser foot 2b and a stopper 8 provided on the boss portion 1a on the side of the fixed V-pulley piece 1.

In this case, the stopper 8 is usually provided with a claw and has a structure capable of locking the spring 7, but it is also possible to lock the spring 7 by other means.

Furthermore, although the movable V pulley piece 2 and the shaft or fixed V pulley piece boss portion 1a are movable in the axial direction, the movable V pulley piece 2 and the spring retainer 2b provided on the side surface of its boss portion 2a are movable in the rotational direction. Rotation is prevented by a spring 7 or by a key and a spline.

Note that both ends of the spring 7 are not limited to the claws of the spring presser 2b and the stopper 8, but are made of an elastic material with a large frictional force between the respective contact parts, such as rubber, polyurethane elastic material, resin, or a rubber matrix reinforced with fibers. It is also possible to arrange and lock it.

Furthermore, it is also possible to employ a system in which the movable V-pulley piece 2 is freely movable in the thrust direction and rotational direction.

Further, as shown in the figure, a bearing 4 is separately provided on the boss portion 2a of the movable V-pulley piece 2, and a grooved cylinder is provided on the outer periphery of the bearing 4 to apply an external force to the movable V-pulley piece 2. A body 3 is provided, and a friction plate 5 that engages with a disk 10 of a friction plate 9 on the reverse rotation V-pulley 16 side, which will be described later, is provided at the extending end of the boss portion 2a.

Next, on the side of the speed change pulley of the drive side pulley, another pulley V ₂ for reverse rotation, the V pulley 16, is coaxial with the speed change pulley.
Although they are arranged in pairs on _S1 , the configuration of this V-pulley for reverse rotation constitutes the main part of the present invention, and has the following configuration. That is, first, a friction plate 9 having a disk 10 facing the friction plate 5 is connected to the shaft via a bearing 11.
A gear 12 is integrally attached to the end of the boss portion of the gear _S1 .
This gear 12 meshes with an internal gear 14 attached to the shaft S via a bearing 15 through an idle gear 13 on its outer periphery, and rotates in reverse on the outer periphery of the internal gear 14 closer to the speed change pulley. A V pulley 16 is integrally provided.

In the above gear configuration, the idle gear 13 has a fastening fitting that prevents it from rotating around the shaft from the outside of the pulley body, so that it can freely rotate with respect to the shaft 17 of the gear.

The driving pulley A is constructed as described above, and the driving pulley piece A is coaxially and integrally mounted on the opposing driven pulley E, that is, the opposing parallel driven shaft _S2, as usual. A fixed V pulley or a variable speed pulley V _' , which is opposed to the drive side variable speed pulley V1;
On the other hand, a V pulley, a flat pulley, a multi-rib pulley, a toothed pulley, etc., are provided as opposed to the V _pulley for reverse rotation, and an idler pulley, tension pulley, etc. is installed between these drive side and driven side pulleys as necessary. The belts B ₁ and B ₂ are suspended between the opposing pulleys on the drive side and the driven side, and the whole is constructed as a series of forward/reverse transmissions.

In addition to at least one V-belt including a multi-ribbed belt, the belt suspended between both pulleys may be a flat belt, a toothed belt, a round belt, a chain, etc. In this case, each V-belt may be As a matter of course, a pulley suitable for each of these belts is used.

Further, the use of the idler pulley and the tension pulley, especially the use of the tension pulley, is such that, for example, in the transmission device, when the driven pulley opposite to the driving speed change pulley is a fixed pulley, a tension pulley may be provided between the two. This is because it is necessary to absorb changes in the length of the belt when changing gears.

It is also preferable to provide a tension pulley to absorb and adjust the slack of the belt over time when the belt is suspended between the driven pulleys facing the V-pulley for reverse rotation of the driving pulley. . Further, the tension pulley is moved by the friction plates 5, 9 in conjunction with the movement of the movable V-pulley piece 2 in each figure.
10 disks for use during or as needed
The reverse rotation belt may be pressed while power is being transferred through the drive shaft to generate belt tension, thereby transmitting power from the drive shaft to the driven shaft. In this way, when the friction plates 5 and 9 are off, the initial tension on the belt _B2 for reverse rotation is zero or a small value, and the bearing 1 is
This is advantageous because it can reduce the burden on the operator.

The transmission of the present invention has the above configuration,
Next, the operation of the device will be explained based on Figs. 1 to 4. Figs. 1 and 2 show the rotation direction of the driven shaft in the forward direction, and Fig. 1 shows the state at high speed. With belts B ₁ and B ₂ suspended between driving pulley A and driven pulley E, respectively,
An external force is generated in the left direction on the movable V pulley piece 2 through the grooved cylinder 3 on the bearing 4 provided on the movable V pulley piece 2 of the drive side pulley A, and the driven shaft is set to the maximum effective diameter of the belt _B1 . The rotation speed is the highest.

FIG. 2 shows a state in which the effective diameter of the belt _B1 is at an intermediate position, and the belt B1 is at a medium speed.

That is, with a gap between the abdomen of the belt B ₁ and the belt clutch bearing 6, and also with a gap between the friction plates 5 and 9 or the disc 10, the cylindrical body 3 on the bearing 4 This is a state in which the movable V-pulley piece 2 has been moved to the right in the figure from the position shown in FIG. 1 by an external force via.

As a common feature in FIGS. 1 and 2, there is a friction plate 5 integrated with the movable pulley piece 2.
A space exists between the disk 10 and, for example, a disk 10 having a large friction coefficient, which is provided with a friction plate 9 connected to the V-pulley 16, and the rotational force from the drive shaft S is transferred to the V-pulley 16.
It is blocked by a bearing 15 provided at the bottom.

In this way, the rotational force from the shaft S ₁ is transmitted via the belt B ₁ to the V pulley V ₁ ′ which is integrated with the driven shaft S ₂ , and the rotational force from the coaxial shaft S ₂
transmits forward rotation to. On the other hand, with respect to pulleys V ₂ , V ₂ ′ and belt B _{2 ,} the friction plates 5 , 9 , and 10 are in a non-contact state, and rotation of the drive shaft S ₁ is blocked by bearings 11 and 15, so that power transmission is prevented. Because it does not rotate, power is transmitted only in the forward direction.

Next, in Figure 3, the belt clutch is OFF.
This figure shows the state of FIG.
In the same manner as described above, when the belt B ₁ is moved to the right side in the figure by an external force such as a shifter and the V groove width of the drive side speed change pulley is widened, the belt B 1 sinks into the groove and the belt B 1 is placed on the belt clutch bearing 6. ₁ 's abdomen is placed on it, and belt B is fixed to the side of ₁ and V
When there is no gap between the sides of the pulley piece 1 and the movable V-pulley piece 2, and when there is also a gap between the friction plates 5 and 9, the rotational force from the driving pulley A is applied to the belt _B1 . is no longer transmitted to
The rotational force of the belt _B1 becomes zero, no rotation is transmitted to the driven side, and the clutch becomes OFF.

On the other hand, FIG. 4 shows a state in which the driven pulley is rotated in the opposite direction to that of the driving pulley, which is the most important point in the present invention. That is, drive side pulley A
The movable pulley piece 1 is connected to the belt clutch shown in FIG.
When moved further to the right than the OFF position, both friction plates 5 and 9 come into contact with each other, and at this time, the abdomen of the belt B ₁ rests on the belt clutch bearing 6 on the speed change pulley of the driving pulley A. Rise,
The belt stops because there is a gap between both pulley pieces. In this state, the rotational force is transmitted from the friction plate 5 on one side of the movable V pulley, which is integral with the shaft _S1 in the rotational direction, to each gear 12, 13, through the friction plate 9 on the other side.
14 to the V pulley 16, and transmits the rotational force in the opposite direction to the V pulley V ₂ ' on the driven shaft S ₂ via the belt B ₂ .

To explain this in more detail, when the friction plates 5 and 9 are brought into contact with each other via the disk 10 and power is transmitted, the rotational direction of the shaft is transmitted from the gear 12 integrated with the friction plates 5 and 9 to the internal gear 14 via the idle gear 13. rotation is transmitted in the opposite direction. Therefore, V integrated with this internal gear 14
The power is transmitted to the driven pulley V ₂ ′ by the belt B ₂ suspended on the pulley 16, but at this time,
Naturally, the direction of rotation transmitted to the driven shaft is opposite to the direction of rotation of the drive shaft.

Here, what is common to FIGS. 1 to 4 is that in order to prevent the idle gear 13 from moving in the inner circumferential direction of the internal gear 14 integrated with the V-pulley 16, an external Prevent rotation using a rotation stopper fitting 17.

Thus, by changing the position of the movable V-pulley piece of the driving pulley by an external force, the rotation of the driven shaft _S2 is accelerated or decelerated in the positive direction while the driving shaft _S1 is continuously rotating. Clutch-off reversal can be operated each time.

As described above, the device of the present invention is configured so that the V groove width interval formed by the fixed V pulley piece and the movable V pulley piece in the variable speed pulley of the drive side pulley can be made variable, and the movable V groove width in the drive side pulley is made variable.
A friction plate is provided opposite the boss portion of the pulley piece and the V-pulley for reverse rotation, and the latter friction plate blocks shaft rotation by a bearing, and transmits it to the V-pulley for reverse rotation via a gear mechanism, Furthermore, since the driving pulley and the driven pulley are arranged opposite to each other, and a belt is hung between the corresponding pulleys, friction can be reduced simply by moving the movable V-pulley piece of the driving pulley in the axial direction using an external force. Through plates, gears, idle gears, and internal gears, each state of high speed, medium/low speed, clutch-off, and reverse can be easily and continuously achieved, making it possible to continuously change the speed of a vehicle when moving forward, as well as to move backward, which is much easier than ever before. It is possible to provide a reversible transmission device at low cost by completely eliminating the need for a gearbox such as the one described above, and by using the gear mechanism, the device can be made compact and has better operability. It can be extremely useful in a wide range of applications such as automobiles, motorcycles, and agricultural machinery.

[Brief explanation of the drawing]

1 to 4 show an outline of the driving pulley of the forward/reverse transmission of the present invention in various states, each A is a partially omitted cross-sectional view, and each B is a sectional view, respectively.
, - are cross-sectional views, in which FIG. 1 shows the state at high speed, FIG. 2 shows the state at medium speed, FIG. 3 shows the state when the clutch is off, and FIG. 4 shows the state at reverse. A... Drive side pulley, 1... Fixed V pulley piece,
2...Movable V pulley piece, 3...Cylinder body, 4, 6...
Bearing, 7... Spring, 5, 9... Friction plate, 10... Disk, 11, 15... Bearing, 12... Gear, 13... Idle gear, 14...
Internal gear, 16... V pulley for reverse rotation, B ₁ ,
B ₂ ...Belt, S...Drive shaft.

Claims (1)

[Claims] _1. A movable V pulley piece is provided that is slidable in the axial direction and integrally rotated in the axial direction with respect to the boss portion extending in the axial direction of the fixed V pulley piece fixed to the shaft S1, and the fixed V pulley piece and the movable V pulley piece are A radial bearing is attached to the boss portion of the fixed V pulley piece at the bottom of the V groove of the speed change pulley formed by the above, and a spring is inserted between the movable V pulley piece and a stopper fixed to one side of the pulley. A pulley V ₁ comprising a friction plate protruding from the boss portion of a movable V pulley piece, and a cylindrical body that applies a force from the outside via a bearing attached to the boss portion between the friction plate and the movable V pulley piece. is the drive side pulley, and the pulley V ₁ and
Correspondingly, in a device in which a belt _B1 is suspended between a driven pulley _V1 ' provided on a driven shaft _S2 parallel to the shaft, a friction plate of a movable V pulley piece of the driving pulley A friction plate facing the movable V-pulley is provided on one side of the movable V-pulley on the drive shaft of the drive pulley so as to be rotatable in the rotational direction via a bearing, and a gear is integrally mounted on the friction plate, and a gear is integrally mounted on the friction plate. A pulley is integrally provided on a part of the outer periphery of the internal gear to form a reverse rotation pulley V ₂ , and the pulley V ₂ and the corresponding driven Driven pulley on axis S ₂
A belt forward/reverse transmission device characterized in that a belt B ₂ is suspended between a driven pulley V ₂ ′ and a driven pulley V 2 ′ coaxially provided on the side of V ₁ ′.