JPS6179059A - Speed changer - Google Patents

Abstract

PURPOSE:To enable backward movement without using a V-belt-type stepless transmission, by providing a forward and backward movement switchover mechanism for one of an input shaft and a speed reduction shaft, and coupling the mechanism and a forward movement sprocket to the other by a chain. CONSTITUTION:A spline hub 23 in provided at the end of a primary shaft 6 and opposed to a spline hub 15. A sleeve 18 is spline-engaged with the peripheral portions of the spline hubs 15, 23 and the backward movement splines 16a of a sprocket 16. For backward movement, the sleeve 18 is moved rightwards as to the drawing to transmit the motive power of an input shaft 2 to an output shaft 22 through the sprocket 16, a chain 17, a backward movement sprocket 4 and a speed reduction shaft 12 without using a V-belt-type stepless transmission 5.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a transmission device suitable as an automobile transmission, and particularly to a transmission device in which the primary side of a belt-type continuously variable transmission is driven by an input shaft, and the output shaft is driven by an input shaft of the belt-type continuously variable transmission. This relates to a transmission connected to a secondary shaft.

Prior art and its problems Conventionally, this type of transmission device was disclosed in Japanese Patent Application Laid-Open No. 58-1494.
As described in Japanese Patent No. 58, it is known that an input shaft and a primary shaft are arranged parallel to each other in a non-axial direction, and the secondary shaft is driven by the input shaft via a reduction gear. A forward/reverse switching mechanism is installed on a shaft located on the same axis as the input shaft, and gears between the input shaft and the primary shaft are directly engaged when moving forward, and an idle gear is installed between the input shaft and the primary shaft when moving backward. Switching between forward and backward movement is achieved by engaging the wheels through the .

However, in the above structure, power is transmitted to the output shaft via a belt-type continuously variable transmission not only when moving forward but also when moving backwards, so power is transmitted to the output shaft via a belt-type continuously variable transmission. Therefore, there is a problem in that the power loss during reversing is large, and the control becomes complicated because the pulleys of the continuously variable transmission must be controlled even during reversing. Furthermore, since it is necessary to provide an idle gear between the input shaft and the primary shaft, there is a problem that the number of shafts increases, which increases the number of assembly steps and increases the cost.

Purpose of the Invention The present invention has been made in view of such conventional problems.
The object is to provide a transmission device that transmits power without using a held-type continuously variable transmission when going backwards, and that can move backwards without providing an idle gear.

Structure of the Invention In order to achieve the above object, the present invention provides: ``an input shaft is connected in series with the primary side of a heald type continuously variable transmission, and a secondary shaft of the held type continuously variable transmission is connected in series with the In a transmission connected to an output shaft via a reduction shaft parallel to the above, one of the input shaft or the reduction shaft is provided with a forward/reverse switching mechanism, and the other is provided with a reverse sprocket, and the reverse sprocket and the above forward/reverse The sprocket provided in the switching mechanism is connected with a chain.

As a result, when going backwards, the power of the human power shaft is transmitted to the output shaft via the reverse sprocket, chain, forward/reverse switching mechanism, and reduction shaft without going through the heald, and the input shaft and reduction shaft are connected to each other by the chain. Since the motor rotates in the same direction, the idle gear can be omitted.

DESCRIPTION OF EMBODIMENTS FIG. 1 shows a first embodiment of a transmission according to the present invention,
A fluid coupling 3 and a reverse sprocket 4 are provided on an input shaft 2 connected to an engine 1.
is connected in series with the primary shaft 6 of the belt-type continuously variable transmission 5.

■As is well known, the belt type continuously variable transmission 5 has a primary shaft 6 and a secondary shaft 7, and each shaft is provided with a pulley 8.9 whose diameter can be made variable, and between these pulleys V bell'
By adjusting the pulley diameters of pulleys 8 and 9 using a hydraulic device, etc., the FIO is wound around.
The gear ratio can be changed steplessly.

A gear 11 provided at the end of the secondary shaft 7 meshes with a forward gear 14 of a forward/reverse switching mechanism 13 provided on a reduction shaft 12 parallel to the secondary shaft 7. Deceleration shaft 1
It is rotatable relative to 2.

A spline hub 15 that rotates integrally with the reduction shaft 12 is provided on the left side of the forward gear 14, and a reduction shaft 1 is provided on the opposite side of the forward gear 14 with the spline hub 15 in between.
A rotatable sprocket 16 is provided with respect to 2. A chain 17 is attached between this sprocket 16 and the reverse sprocket 4, so that the sprockets 4.16 rotate in the same direction. The forward gear 14 and the sprocket 16 are each integrally provided with spline teeth 14a, 16a, and these spline teeth 14a, 16a are slidably spline engaged with the outer periphery of the spline hub 15 for forward/reverse switching. Forward movement and reverse movement are selectively determined by the sleeve 18. A gear 19 fixed to the right end of the reduction shaft 12 meshes with a gear 21 of a differential 20, whereby the power of the secondary shaft 7 is reduced by the reduction shaft 12 and transmitted to the output shaft 22.

The sleeve 18 is actuated in the axial direction by a shift fork or the like (not shown), and meshes with either the forward spline teeth 14a or the reverse spline teeth 16a with the spline hub 15 in between. Therefore, if the sleeve 18 is actuated to the right as shown, the sleeve 18 will straddle and engage the spline hub 15 and the forward spline tooth 14a, causing the sleeve 18 to engage the spline hub 15 and the forward spline tooth 14a.
6a, the power of the input shaft 2 is transmitted to the output shaft 22 via the belt-type continuously variable transmission 5, the forward gear 14, the sleeve 18, and the reduction shaft 12, and is connected to the human power shaft 2 and the output shaft. Since it rotates in the same direction as the shaft 22, the vehicle can be moved forward.

On the other hand, when the sleeve 18 is moved to the left in the figure, the sleeve 18 moves between the spline hub 15 and the backward spline teeth 16.
The forward spline teeth 14a are engaged with each other astride the forward spline teeth 14a.
Because the input shaft 2 does not mesh with the and the input shaft 2
Since the output shaft 22 and the output shaft 22 rotate in opposite directions, the vehicle can be moved backward.

Note that when the sleeve 18 is operated to perform forward/reverse switching, it is necessary to temporarily cut off power transmission in order to prevent gear noise and achieve smooth switching.For this purpose, a clutch for power interruption is input. It may be provided on the shaft 2 or the secondary shaft 7.

FIG. 2 shows a second embodiment of the present invention, in which a forward/reverse switching mechanism 13 is provided on the human power shaft 2 and a reverse sprocket 4 is provided on the reduction shaft 12. That is, a spline hub 15 and a rotatable sprocket 1 are mounted on the input shaft 2.
6, and the above-mentioned spline hub 1 is provided at the tip of the -next shaft 6.
A spline hub 23 is provided opposite to the spline hub 15.23, and the sleeve 18 is spline-engaged with the outer periphery of the spline hub 15.23 and the backward spline tooth 16a of the sprocket 16, thereby making it possible to switch between forward and backward motions. When moving forward, the sleeve 18 is moved to the left as shown in the figure, and the power of the input shaft 2 is transmitted to the output shaft 22 via the V-belt type continuously variable transmission 5 and the reduction shaft 12. On the other hand, when traveling in reverse, the sleeve 18 is moved to the right, and the power from the input shaft 2 is transmitted through the sprocket 16, chain 17, reverse sprocket 4, and reduction shaft 12 without passing through the V-belt continuously variable transmission 5. The signal is transmitted to the output shaft 22.

In addition, in this second embodiment, the forward/reverse switching mechanism 1 is provided on the input shaft 2.
3, when the sleeve 18 is operated in the neutral (neutral) position, the pulleys 8 and 9 of the V-belt continuously variable transmission 5 do not need to be turned, and wear and tear on the belt 10 can be prevented. effective.

In both of the above embodiments, the sleeve 18 is used as the forward/reverse switching mechanism 13, but the invention is not limited to this, and the forward/reverse switching may be performed using a hydraulic clutch 24 as shown in FIG.

Effects of the Invention As is clear from the above explanation, according to the present invention, the forward/reverse switching/switching mechanism provided on one of the input shaft or the deceleration shaft and the reverse sprocket provided on the other are connected by a chain. When traveling in reverse, the power of the input shaft is transmitted to the output shaft without passing through the V-belt, so there is no power loss and there is no need for pulley control. In addition, by omitting the idle gear for reverse and adopting a 4-axis configuration, the number of axes can be reduced compared to conventional models.
Structure and assembly can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a skeleton diagram showing the overall configuration of a first embodiment of the transmission according to the present invention, FIG. 2 is a skeleton diagram of the second embodiment, and FIG. 3 is a skeleton diagram of a modification of the forward/reverse switching mechanism. be. 2...Input shaft, 4...Reverse sprocket, 5...
・V-held continuously variable transmission, 6...-secondary shaft, 7...secondary shaft, 10...V-belt, 12...reduction shaft, 13-
... Forward/forward switching mechanism, 14... Forward gear, 16...
・Sprocket, 17...Chain, 18...Sleeve, 20...Differential, 22...Output shaft.

Claims (1)

[Claims] (1) The input shaft was connected in series to the primary side of the V-belt continuously variable transmission, and the secondary shaft of the V-belt continuously variable transmission was connected to the output shaft via a reduction shaft parallel to the secondary shaft. In the transmission,
A forward/reverse switching mechanism is provided on one of the input shaft or the deceleration shaft, a reverse sprocket is provided on the other, and the reverse sprocket and the sprocket provided on the forward/reverse switching mechanism are connected by a chain. gearbox.