JPS62106162A - Reversing mechanism for power transmission device - Google Patents

Abstract

PURPOSE:To provide a reversing transmission device having simple constitution, by a method wherein a loosely rotatable gear and a chain sprocket, located on a driving shaft, are coupled with a gear and a loosely rotatable chain sprocket, respectively, situated on a driven shaft, directly or through a chain, and an engaging piece, serving to prevent the occurrence of reversing, is mounted each shaft. CONSTITUTION:A loosely rotatable first driving gear 34, located on a driving shaft 26, is engaged with a first driven gear 38 on a driven shaft 32, a driving chain sprocket 35 and a driven chain sprocket 41, situated on the two shafts 26 and 32, respectively, are intercoupled through a transmission chain 42. Since an engaging piece 37 on the driving side and an engaging piece 43 on the driven side are situated on the two shafts 26 and 32, respectively, so that the engaging pieces are movable only in the direction of an axis, through axial movement of the two engaging pieces 37 and 42, either the first driving gear 34 or the two chain sprocket 35 or 41 is engaged with the shafts 26 and 32, and this enables easy change of the rotation direction of the driven shaft 32.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a reversing mechanism in a power transmission device for a vehicle or the like.

(Prior art) Conventionally, some of the above-mentioned reversing mechanisms have an idler gear interposed between the drive gear and the driven gear in a constantly meshed manner, and the driving force of the engine is transmitted from the drive gear to the driven gear via the idler gear. By doing so, the vehicle can move backward.

(Problem to be Solved by the Invention) Incidentally, the above conventional configuration is provided with an idler gear, but this idler gear is supported independently on the stationary side of the reversing mechanism, and this idler gear is connected to the driving gear and the driven gear. Since the bearing meshes with both gears, strict precision is required in the construction of the bearing. Therefore, the configuration of this reversing mechanism is complicated.

Further, the idler gear configured as described above is always meshed with the drive gear and the driven gear, and is allowed to freely rotate when not being driven in reverse. Therefore, while the vehicle is moving forward, an unnecessary meshing sound is generated between these gears, which causes noise.

(Objective of the Invention) The present invention has been made by paying attention to the above-mentioned π circumstances, and provides a reversing mechanism for each power transmission wave that has a simple configuration and prevents sweating when not being driven in reverse. Let be [1 target.

(Structure of the Invention) - The feature of this invention to achieve the eleventh objective is that the drive chain wheel is provided on the drive shaft so that it can freely rotate (and the driven chain wheel on the driven shaft can be freely rotated). A transmission chain is wound around the drive chain wheel and the driven chain wheel, and power transmission between the drive shaft and the drive chain wheel and between the driven shaft and the driven chain wheel can be disconnected and connected. The point is that

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 2 and 3, reference numeral 1 denotes a straddle-type automatic four-wheel, single-turn vehicle, and its body frame 2 includes a drive device 3, a front wheel system 5!24 driven by this drive device 3, and a rear wheel system. 5 is supported. Further, a par handle 7 and a fuel tank 8 are provided in the northern part of the vehicle body frame 2, and a seat 9 is provided behind the fuel tank 8. In addition, there is a pair of steps 1 on which the rider on this seat 9 places his/her feet.
0°10 is sunk into the bottom of the V-body frame 2.

1. The drive device 3 includes an engine 12 and this engine 12.
The first power transmission device 13 is operatively connected to the first power transmission device 13.

”The front wheel device 4 has a pair of left and right front wheels 14.14,
A front axle 15 is connected to each front wheel 14, respectively.

In addition, a front wheel differential device 17 is provided between both front axles 15 and 15.
is provided. This front wheel differential 17 is a known one, and has a drive pinion 18 on the input side and a pair of left and right differential side gears 19, 19 on the output side. are connected to each other.

The rear wheel device 5 has a pair of left and right rear wheels 20.20, and the two rear wheels 20.20 are tightly connected by a rear axle 21.

Further, a rear wheel gear device 23 is provided that enables power transmission from the L drive device 3 side to the rear wheel i21.

The first power transmission device 13, the front wheel differential device 17, and the rear wheel gear device 23 are interlocked and connected via a second power transmission device 24 attached to the outer surface of the crankcase of the engine 12. This second power transmission device 24 is connected to the engine 12
The driving force transmitted through the first power transmission device 13 is selectively switched between high speed and low speed, and is transmitted to the rear wheels 20.
20 only, or in addition to this, the front wheel 14°1
4 can also be transmitted. Further, the second power transmission device 2
4 has a reversing mechanism 25 that switches the driving force from the forward state of both heavy vehicles to the reverse state 1 of the vehicle.

Referring now to FIG. 1, the second power transmission device 24 will be explained in detail.

This second power transmission device 24 is the first power transmission device 13
an input shaft 26 which is a drive shaft that receives the driving force of the engine 12 via a front wheel propulsion shaft 27; I! is connected to the input end of the rear wheel gear system 23 through the propulsion shaft 30 for the rear wheel. i! After being tied, the first output sleeve 31,
It has an intermediate shaft 32 which is a driven shaft and is interposed between the human power sleeve 26 and the rear output 4:b 31.

A first drive gear 34 and a reverse drive gear Ilt 35 are provided on the I-ki 26 so that they can rotate freely, and a second drive gear 36 is spline-fitted to be slidable only in the axial direction of the input shaft 26. Supported in certain cases. This second drive tooth - IL36
A drive side engager 37, 37 is formed in the drive side engager 37, which can be freely engaged and disengaged from either the first movable mountain ilj 34 or the reverse drive chain wheel 35 in the form of a dog clutch by its axial movement.

-・The second intermediate shaft 32 has the first driving tooth Hii3.
A first intermediate gear 38 that fits 4 and 11 is supported, and
The second width mountain 1 (40
A reverse driven chain wheel 41 corresponding to the reverse drive chain wheel 35 is rotatably sunk. A transmission chain 42 is wound around the reverse driving chain wheel 35 and the reverse driven driven gear 41, and this is used as the reversing mechanism 25. Further, a driven side engager 43 is supported on the intermediate shaft 32 by spline fitting so as to be slidable only in the axial direction of the intermediate shaft 32, and this driven side engager 43 moves in the axial direction to engage the second intermediate gear. 40 or the reverse driven chain wheel 41 in the form of a dog clutch.

Further, the rear wheel output shaft 31 is provided with the first intermediate southeast 38
A rear wheel driven float 45 that meshes with the rear wheel is supported.

On the other hand, a front wheel engager 46 is supported by spline fitting on the front wheel output shaft 29 so as to be slidable only in the axial direction of the front wheel output shaft 29. It can be freely engaged and disengaged from the first drive gear 34 in the form of a dog clutch.

1 to 3, the drive side engager 37 is operated so that it does not engage with either the first drive gear 34 or the reverse drive chain wheel 35, and then the driven side engager 43 to engage the second intermediate south wheel 40, the driving force of the engine 12 is transferred from the input shaft 26 to the second driving south wheel 3.
6→Second intermediate gear 4〇-driven side engager 43→Intermediate shaft 32
→ First intermediate gear 38 - Rear wheel driven gear 45 → Rear wheel output shaft 31 → Rear wheel propulsion shaft 30 → Rear wheel gear device 23 → Transmitted to rear wheel 20.20 via rear axle 21 . in this case,
The driving force of the carrot 12 is decelerated between the second driving south small 36 and the second intermediate float 4o, that is, by this operation, a rear two-wheel drive state 1π of low speed forward movement is obtained.

Further, in addition to the above state, when the front wheel engaging element 46 is further operated to engage the front wheel engaging element 46 with the first drive gear 34, the engine 12 is connected to the first intermediate gear 38 as described above. The transmitted driving force is transmitted to the front wheel 14.1 via the first drive gear 34 -> front wheel engager 46 - front wheel output shaft 29 - front wheel propulsion shaft 27 -> front wheel differential 17 -> front axle 15.15.
It is also transmitted to 4. In other words, this operation provides a low-speed forward four-wheel drive state.

Furthermore, when the drive-side engager 37 is operated to engage the first drive wheel 34, the driving force of the engine 12 is transferred to the input shaft 2.
6→first drive wheel 34→first intermediate drive wheel 38→rear wheel driven south wheel 45→rear wheel output shaft 31, and only the rear wheels 20 and 20 are driven in the same manner as described above. In this case, the first drive vehicle 34 is 1-. 2 Since the diameter is larger than that of the second drive gear 36, the reduction ratio is small, and therefore, by this operation, a rear two-wheel drive state of high-speed forward movement can be obtained.

Furthermore, in addition to the state described in "-", the front wheel engagement 446
When the front wheel retainer 46 is engaged with the first drive gear 34, the driving force transmitted from the engine 12 to the first drive gear 34 as described above is transmitted to the front wheel output shaft 29. As in the case of the low-speed forward four-wheel drive state, the front wheel 1
4.14 will also be transmitted. That is, by this operation, a high-speed forward four-wheel drive state is obtained.

Further, when the drive side engager 37 is operated to engage the reverse drive chain wheel 35, and then the driven side retainer 43 is operated to engage the reverse drive chain wheel 41, engine 1
The driving force of 2 is input shaft 26 → reverse drive chain wheel 35 → transmission chain 42 → reverse driven button wheel 41 → intermediate shaft 32 → first intermediate south wheel 38 → rear wheel driven chain wheel 45 → output for rear wheels It is transmitted via the shaft 31 to the rear wheels 20,20. In this case, intermediate shaft 3
2 rotates in the opposite direction to the forward movement, and the driving force of the engine 12 is decelerated between the reverse drive chain wheel 35 and the reverse driven chain wheel 41. That is, by this operation, a rear two-wheel drive state with low speed reverse movement is obtained.

In addition to the above conditions, 2. In addition, the front wheel engagement f-46
When this is operated and engaged with the first drive gear 34, the driving force transmitted from the engine 12 to the first drive gear il< 34 as described above is output from the front wheel retainer 46" ii7? wheel output shaft. The power is transmitted to the shaft 29, and is also transmitted to the front wheels 14, 14 in the same manner as described above.In other words, this operation provides a low-speed reverse four-wheel drive state.

In the two-leg configuration, since the reversing mechanism 25 is provided within the second power transmission device 24 attached to the outer surface of the crankcase of the engine 12, maintenance such as inspection of the transmission chain 42 can be easily performed. The transmission chain 42 may be a silent chain, a bundled chain, or a roller chain.

(Effects of the invention) The effects of this invention are as follows. That is, in the past, an idler gear was interposed between the drive shaft and the driven gear as a regular mesh type, thereby obtaining a reversed shape of 7g, but according to the present invention, a drive chain wheel is attached to the drive shaft. In addition to freely rotating the driven chain wheel on the driven shaft, we also installed a driven chain wheel so that the driven chain wheel could rotate freely, and by winding a transmission chain around these driving chain wheels and the driven chain wheel, a reversed state was obtained. The idler gear that was previously installed is no longer necessary.

Therefore, supporting means for this idler gear is unnecessary,
Furthermore, since it is a chain transmission type, strict accuracy is not required, and therefore, this reversing mechanism can be of a simple configuration.

In addition, power transmission between the drive shaft and the drive chain wheel and between the driven shaft and the driven chain wheel can be connected and disconnected, so when moving forward, the power transmission between the drive shaft and the drive chain wheel, and between the driven shaft and the driven chain wheel is possible. By cutting off the power transmission between the vehicle and the vehicle, unnecessary rotation of the driving chain wheel and the driven chain wheel is prevented, thereby preventing the generation of unnecessary noise.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a plan sectional view of the second power transmission device, Fig. 2 is a schematic cross-sectional view of the entire straddle-type four-wheeled motor vehicle, and Fig. 3 is a straddle-type four-wheel motor vehicle. It is a schematic front view of a four-wheeled vehicle. 26φ・Input shaft (drive shaft), 32・・Intermediate shaft (driven shaft)
, 35... Reverse drive chain wheel, 37... Drive side engagement element, 4
1. Reverse driven chain wheel, 42. Transmission chain, 43.
- Driven side engager.

Claims (1)

[Claims] 1. A drive chain wheel is provided on the drive shaft so that it can rotate freely, and a driven chain wheel is installed on the driven shaft so that it can rotate freely, and a transmission chain is wound around these drive chain wheels and the driven chain wheel, so that the drive shaft and A reversing mechanism in a power transmission device, characterized in that power transmission between a driving chain wheel and between a driven shaft and a driven chain wheel can be connected and disconnected.