JPS60164049A - Car drive device - Google Patents

Abstract

PURPOSE:To aim at miniaturizing a car drive device, by organically combining a normally meshing type speed change gear, a differential gear unit and forward and backward movement change-over device. CONSTITUTION:Rotation from an engine 100 is transmitted to the drive pulley 56 of a V-belt type stepless speed change device 56. When a control lever is set at a forward first speed position, a shifter 76b is engaged with a small speed reducing gear 64b by means of a speed change drum 80 since a slider 66 is shifted to the right. Therefore, the rotation of an input shaft 54 is transmitted to a rear wheel axle 48 through a speed change gear shaft 52, the slider 66, the small speed reducing gear 64b, a large speed reducing gear 38b and a differential gear unit 36. Meanwhile at the Backward movement position, the slider 66 is returned to its neutral position while an idle gear 72 is moved to the position indicated by the phantom line, and the rotation of the input shaft 54 is transmitted to a gear 116, the idle gear 72 and a gear 118 integrally incorporated with the small speed reducing gear 64a to rotate the large speed reducing gear 38a and the rear wheel axle 48 in the backward direction.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a drive device for a vehicle that is equipped with a constant mesh transmission and a differential device and is capable of switching between forward and forward directions.

(Background of the Invention) In small vehicles, it has been considered to transmit the rotational output of an engine to a pair of left and right drive wheels via a constant mesh transmission and a differential device. In particular, if a small vehicle is to be able to switch between forward and reverse directions, it is desirable to downsize the transmission, differential gear, and forward/backward switching device.

(Objective of the Invention) The present invention was made in view of the above circumstances, and provides a vehicle drive system that organically combines a constant mesh transmission, a differential device, and a forward/reverse switching device, thereby making it possible to downsize the vehicle. The purpose is to provide a device.

(Structure of the Invention) In order to achieve this object, the present invention changes the rotational output of the engine to
In a vehicle drive device that transmits power to a pair of left and right drive wheels via a constant mesh transmission and a differential device, a plurality of large reduction gears fixedly installed in a differential gear box of the differential device, and each of these reduction gears are provided. A plurality of small reduction gears are meshed with a large gear and are selectively fixedly held on a reduction gear shaft, and an input shaft is arranged in parallel with the reduction gear shaft, and the rotation of the input shaft is always controlled by the reduction gear. On the other hand, in the reverse state, the rotation of the input shaft is transmitted to one of the reduction gears via the reverse idle gear.

(Example) The present invention will be described in detail below based on the drawings.

Fig. 1 is a side view of an embodiment of the present invention, Fig. 2 is a side view of the power device, Fig. 3 is a plan view, Fig. 4 is a sectional view taken along the line ■-■, and Fig. 5 is the power transmission. It is a development diagram showing a route.

In FIG. 1, reference numeral 10 indicates a pair of left and right steering front wheels (only one is shown), 12 a steering handle, 14 a driver's seat, and 16 a body. 18 (18a, 18b) are side members that pass along the lower side of the podium 16 in the front-back direction; 20 is a cross member that connects both side members 18; each of these members 18, 20 and other members (not shown); A frame 22 is constructed. Note that the side member 18 has the rear side of the seat 14 rising diagonally upward and rearward.

A rear axle tube 24 is connected to the cross member 20 by a pair of left and right swinging arms 26 (26a, 26b) extending in the front-rear direction, and is movable up and down. Note 28
is a Panhard rod, one end of which is connected to the left end of the rear axle tube 24, and the other end is connected to an arm 30 that hangs down from the side member 18 and has high rigidity in the left and right direction. It has the function of regulating the movement of the tube 24 from side to side.32 (32a, 32b) is a pair of left and right buffer units, the lower ends of which are attached to the left and right ends of the rear shaft tube 24.
The upper ends thereof are connected to the rear end portions of the side members 18, respectively.

A differential case 34 is integrally connected near the center of the rear axle tube 24. A known splash lubrication type differential gear 36 is housed in the lower part of the differential case 34. This differential device 36 includes a differential gear box 40 in which large reduction gears 38 (38a, 38b) having different numbers of teeth are integrally molded on the left and right sides, a support shaft 42 fixed within this gear box 40,
A differential pinion 44 rotatably held on this support shaft 42
, is provided with a pair of large differential gears 46 (46, a, 46b) that mesh with this small differential gear 44 from the left and right (FIG. 5).

Inside the rear axle tube 24 are a pair of left and right rear wheel axles 48 (48a, 4
8b) are inserted, their inner ends are connected to the large differential gear 46, and their outer ends project left and right from the rear axle tube 24, and the rear wheels 50 (50a, 50b), which are driving wheels, are fixed to these projecting ends. has been done.

The differential case 34 is made vertically long as shown in FIG.
(Fig. 4) They are arranged in sequence upward so as to be placed on top of each other. The rotation of an engine 100 (described later) is transmitted to the input shaft 54 via a V-belt continuously variable transmission 56 and a centrifugal clutch 58. Rotation of input shaft 54 is transmitted to transmission gear shaft 52 via gears 60, 62. This speed change gear shaft 52 has a small reduction gear 64 that meshes with the large reduction gears 38a and 38b.
(64a, 64b) are held freely rotatable, and a slider 66 is mounted between these reduction gears 64a, 64b so as to be freely slidable in the axial direction. Note that a ball 68 (fifth
) has the effect of smoothing the sliding movement of the slider 66.

Both left and right ends of this slider 66 and reduction gears 64a, 64
b respectively form a dog clutch. By sliding the slider 66, one dog clutch is selectively engaged, and the rotation of the speed change gear shaft 52 is controlled by the slider 66.
, is transmitted to the reduction gear 64a or 64b. In other words, a known constant-mesh type two-speed transmission 70 is formed. Note that a reverse gear 118 is formed on one of the reduction gears 64a integrally with the pawl of the dog clutch.

In front of the straight line, that is, on the axle forward direction side of the speed change gear shaft 52 and the input shaft 54, there is a reverse idle gear 72.
A support shaft 74° shifter 76 (76a
, 76b) and a shift drum 80 are arranged parallel to the rear wheel shaft 48. One end of the speed change drum 80 protrudes from the differential case 34, and a wire drum 82 is fixed thereto (FIG. 5). A wire 84 is wound around this wire drum 82.
Both ends of 4 are connected to other wires 88 (only one shown) via coil springs 86 (only one shown). The other wire 88 is connected to an operating lever (not shown) provided on the driver's seat, and when the operating lever is operated, one of the wires 88, 84 is pulled and the other is loosened, and the drum 88.
2.80 is forced to rotate. Note that the wire 84 is locked in the middle to the wire drum 82. Further, in FIG. 5, 90 is a cam plate fixed to the wire drum 82, and 92 is a cam follower that comes into elastic contact with the cam plate 90.The cam plate 90 and cam follower 92 allow the speed change drum 80 to be moved between forward speeds, 1st and 2nd speeds, and neutral. and held in reverse position.

In Figure 1.2.3, 94 is a torque arm;
Bracket plates 96 fixed to both ends of a substantially U-shaped pipe
(96a, 96b) are integrally fixed to the differential case 34, and the U-shaped pipe portion extends forward. The front end of this torque arm 94 is connected to the vicinity of the center of the cross member 20 by a universal joint made of a rubber damper 98 (FIGS. 2 and 3). This torque arm 94 is used for starting and
It has the effect of receiving the rotational reaction force of the rear wheel 50 that is applied to the rear axle tube 24 during braking.

100 is an upright engine with a nearly vertical cylinder, with rubber dampers 102 and 104 on the torque arm 94.
It is loaded via. The rotation of the crankshaft 106 of this engine 100 is controlled by reduction gears 108 and 110 (Fig. 5).
The signal is transmitted to the drive pulley 56a of the V-belt continuously variable transmission 56 via the V-belt continuously variable transmission 56. The distance between the drive pulleys 56a is
The driven pulley 56a provided on the input shaft 54 decreases as the centrifugal force acting on the ball 112 increases.
Shifting is performed by increasing the interval between the two. Note that 114 is a carburetor connected to the front side of the engine 100.

In this embodiment, in the neutral position of the operating lever, the slider 66 does not engage with both reduction gears 64, and the idle gear 72 does not engage with the slider 66.
comes to the solid line position in FIG. Therefore, the input shaft 54 and the speed change gear shaft 52 idle. When the operating lever is in the first forward speed (second speed) position, the shifter 76b is moved by the speed change drum 80 to send the slider 66 to the right (left side) and the reduction gear 64b is moved.
(64a). Therefore, the rotation of the input shaft 54 is controlled by the speed change gear shaft 52, the slider 66, and the reduction gear 64b.
(64a), the large reduction gear 38b (38a), and the differential gear 36 are transmitted to the rear wheel shaft 48.

When the operating lever is in the reverse position, the slider 66 returns to the neutral position shown in FIG. 5, the idle gear 72 moves to the imaginary line position, and the input shaft 54 rotates integrally with the gear 116, the idle gear 72, and the reduction gear 64a. is transmitted to the gear 118, which rotates the large reduction gear 38a1 and the rear wheel shaft 48 in the reverse direction.

As described above, the rotation of the input shaft 54 is always transmitted to the reduction gear shaft 52 while being reduced by the gears 60 and 62, and the reduction gear shaft 52 is always rotated in a constant direction. When moving forward, the slider 66 moves to reduce the speed of the reduction gears 64a, 64.
b is selectively fixed to the reduction gear shaft 52, and the rotation of the reduction gear shaft 52 is transmitted to the differential gear 36. Also, when traveling in reverse, the rotation of the input shaft 54 is controlled by the reverse idle gear 7.
2 to one of the reduction gears 64a.

In this way, since the reduction gear 64a is shared during forward and reverse movement, and the transmission 70 and the forward/reverse switching device are organically combined, the transmission 70 can be configured to have a narrow width, and as a result, the entire drive device can be made smaller. become.

In this embodiment, since the reduction gears 64a, 64b and the reduction gear shaft 52 are fixed by a dog clutch configured together with the slider 66, the claws of the dog clutch provided on one of the reduction gears 64a are integrated. Reverse gear 118
was formed. Therefore, the space between the differential device 36 and the transmission 70 can be effectively utilized to increase the diameter of the reverse gear 118, and the reduction ratio during reverse travel can be increased. Further, the width of the transmission 70 does not increase.

(Effects of the Invention) As described above, the present invention transmits the rotation of the input shaft to the reduction gear shaft, selectively transmits the rotation of the reduction gear shaft to the reduction gear during forward movement, and further transmits it to the differential gear box. During reverse travel, the rotation of the input shaft is transmitted to one reduction gear via the reverse idle gear.

Therefore, one reduction pinion gear is used in both forward and reverse directions, making it possible to organically incorporate a forward/reverse switching device without increasing the width of the transmission. Therefore, the drive device can be made smaller.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment of the present invention, Fig. 2 is a side view of its power plant, Fig. 3 is a plan view, and Fig. 4 is its IV-r
The V-line sectional view and FIG. 5 are developed views showing the power transmission line. 36... Differential gear, 38... Reduction large gear, 40...
... Differential gear box, 52 ... Speed change gear shaft, 54 ... Input shaft, 64 ... Reduction small gear, 70 ... Transmission, 72 ... Reverse idle gear, 100 ... engine. Fig. 3 Fig. 4 Procedures by Shifu (spontaneous) December 24, 1980 Manabu Shiga, Director General of the Patent Office 1, Indication of the case 1983 Patent Application No. 248812 2, Name of the invention Vehicle drive device 3 -Relationship with the case of the person making the amendment Patent Applicant Address: 2500 Shingai, Iwata City, Shizuoka Prefecture Name (AO7) Yamaha Motor Co., Ltd. Representative: Hideto Eguchi 4, Agent Residence: 1-chome Nishi-Shinbashi, Minato-ku, Tokyo No. 6 No. 21 Sponsorship 6. Number of inventions increased by amendment 0 7. Subject of amendment Attachment Claims (1) Engine rotational output is driven by a pair of left and right through a constant mesh transmission and a differential device. In a vehicle drive device that transmits power to wheels, a plurality of large reduction gears are fixed to a differential gear box of the differential device, and each of these large reduction gears can be fitted and selectively fixed to a reduction gear shaft. It includes a plurality of small reduction gears that are held, and an input shaft that is arranged in parallel to the reduction gear shaft, and while the rotation of this input shaft is always transmitted to the reduction gear shaft, in the reverse state, the rotation of this input shaft is transmitted to the reduction gear shaft. Which one is through the idle gear for
A vehicle drive device characterized in that transmission is transmitted to two reduction gears. (2) A reverse large gear is formed integrally with the reduction gear, and the reverse idle gear meshes with the reverse large gear of the lever in the reverse state. ■Vehicle drive system.

Claims (2)

[Claims] (1) In a vehicle drive device that transmits the rotational output of an engine to a pair of left and right drive wheels via a constant-mesh transmission and a differential device, a plurality of wheels are fixedly installed in a differential gear box of the differential device. , a plurality of small reduction gears that mesh with each of these large reduction gears and are selectively fixedly held on the reduction gear shaft, and an input shaft arranged in parallel with the reduction gear shaft, While the rotation of the input shaft is always transmitted to the reduction gear shaft, in the reverse state, the rotation of this input shaft is transmitted to one of the gears via the reverse idle gear.
A vehicle drive device characterized in that transmission is transmitted to two reduction gears. (2) A vehicle drive device characterized in that a reverse large gear is formed integrally with the reduction gear, and the reverse idle gear meshes with the reverse large gear in the reverse state.