JPH0228751B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a gear shift switching operation mechanism that simultaneously performs forward/reverse switching and continuously variable transmission by operating a single operating tool.

<Prior Art> It is desirable for a simple riding mower or other vehicle to be able to be easily operated even by a housewife or other person with limited knowledge of vehicles.

However, in conventional vehicles of this type, the gear shifting operation and the forward/reverse switching operation must be performed individually, making the operation cumbersome.

Therefore, Japanese Utility Model Application Laid-Open No. 58-29520 discloses a device in which forward and backward switching and gear change are performed by swinging a single lever.

<Problems to be Solved by the Invention> In the device disclosed in the above-mentioned publication, the direction of reciprocating swing of the lever when switching forward or backward is orthogonal to the direction of reciprocating swing of the lever when changing gears. However, there is a risk of erroneous operation by those who are not familiar with the operation.

Furthermore, it requires a mechanism for individually swinging the lever around two axes, resulting in a complicated structure.

The present invention aims to solve the above problems.

<Means for Solving the Problems> The present invention is characterized by: an operating tool 56 which is swingable around a shaft 55 and has portions 56A and 56B extending back and forth in the radial direction of the shaft 55; A shaft 63 extending along the radial front and rear of the shaft 55 and rotatably supported around the shaft, and a pair of arms 65, 6 extending from the shaft 63 along the shaft 55.
6, the operating tool 56 is a forward/reverse switching mechanism 1
5, the pair of arms 65, 66 are interlocked and connected so that when the operating tool 56 swings in one direction, it moves forward and backward, and when it swings in the other direction, it moves forward and backward in the other direction. One of the shafts 63 is engaged with a portion extending from the shaft 55 of the operating tool 56 in one direction in the radial direction, such that the shaft 63 rotates in one direction when the operating tool 56 swings in one direction. The other arm 65, 66 is connected to the shaft 55 of the operating tool 56.
The shaft 63 is engaged with a portion extending in the other direction in the radial direction, such that when the operating tool 56 swings in the other direction, the shaft 63 rotates in the same direction as when the operating tool 56 swings in one direction. The shaft 63 is interlocked with the continuously variable transmission mechanism 14 so as to perform a continuously variable speed operation as the shaft 63 rotates.

<Function> According to the configuration of the present invention, if the operating tool 56 is swung in one direction about the shaft 55, the forward/reverse switching mechanism 15
is in a state in which it moves forward or backward, and if the operating tool 56 is swung in the other direction around the shaft 55, the forward or backward movement switching mechanism 15 becomes in a state in which it moves forward or backward.

Moreover, no matter which direction the operating tool 56 is swung around the shaft 55, the shaft 63 rotates in the same direction, and in conjunction with this rotation, the continuously variable transmission mechanism 14 performs a continuously variable speed operation.

<Embodiment> Figures 1 to 6 show an embodiment of the present invention and its operating mechanism, and 1 is a riding mower exemplified by a riding mower, with a pair of left and right front wheels serving as steering wheels. 2, and a pair of left and right rear wheels 3 serving as drive wheels.

The vehicle body 4 of the work vehicle 1 has a frame structure, and a steering mechanism 5 is installed at the front of the vehicle body 4 in a rearwardly inclined manner, and the steering mechanism 5 steers the front wheels 2 via a transmission means (not shown). It is possible.

The engine 6 is mounted on the rear upper surface of the vehicle body 4,
The engine 6 is covered with an engine cover 7, and in this example, a driver's seat 8 is provided on the middle upper surface of the engine cover 7.

The operator on the driver's seat 8 can steplessly shift the rear wheel 3, which is the driving wheel, back and forth by operating the pedal-shaped gear change operation mechanism 10 on the step section 9 with his/her foot. front wheel 2 through the steering mechanism 5.
can be steered.

A transmission case 11 is attached to the lower surface side of the engine 6, and in this example, the transmission case 11 is attached to the lower surface side of the vehicle body 4 or to the inner surface side of the front-rear frame of the planar longitudinal frame that constitutes the vehicle body 4 (not shown). is supported by the mounting structure.

Here, the engine 6 and the transmission case 11 are arranged vertically, and in plan view, the engine 6 and the transmission case 11 are overlapped and housed within the frame of the vehicle body 4.

The output shaft 12 of the engine 6 is the flywheel 6A
The output shaft 12 is projected forward through the vehicle body 4.
A drive pulley 13 is attached at the center of the width.

Inside the transmission case 11 is a friction continuously variable transmission mechanism 14.
and a forward/reverse switching mechanism 15 using gears, that is, a forward/reverse switching mechanism 15, are installed and supported in parallel in the front-rear direction, and both mechanisms 14, 15 are connected to the interlocking shaft system 1 on the same axis.
6, the interlocking shaft system 16 is located below the output shaft 12 of the engine 6, and is parallel to the output shaft 12 with the same axial direction.

That is, the interlocking shaft system 16 is composed of an input shaft 17 and an output shaft 18 of the continuously variable transmission mechanism 14, which are supported via bearings 19 and 20, respectively. Driven pulleys 21 and 22 are attached to the protruding portions, and these pulleys 21 and 22 and the aforementioned drive pulley 1
A winding transmission mechanism 25 is constructed by winding belts 23 and 24 around the belts 3 and 3, respectively.

The driven pulley 21 is supported by the input shaft 17 through a bearing 26 so that the two can rotate freely, and the pulley 21 is provided with a joint portion 21A on the front surface.

The other driven pulley 22 is attached to the input shaft 17 via a key or spline.

A clutch 80 is interposed in the winding transmission mechanism 25. This clutch 80 is a belt tension clutch and has tension pulleys 81 and 82. Tension is applied to and released from belts 23 and 24 by swinging tension pulleys 81 and 82 via operating levers 83 and 84, respectively. By applying tension,
The power is connected between the drive pulley 13 and the driven pulleys 21 and 22, and the power transmission is cut off by releasing the belt tension. Both tension pulleys 81 and 82 are connected to each operation lever 83 and 8.
4 can be operated independently.

A working machine 27 represented by a mower is supported on the vehicle body 4 between the front wheels 2 and rear wheels 3 via a link mechanism 28 so as to be able to be raised and lowered.
9 and a power receiving part 30, and the receiving part 30 and the joint part 21A are connected to a universal joint shaft 31.
The cutting blade body 29 is rotatable around the vertical axis by being connected by.

Note that the work implement 27 can be freely removed from the vehicle body 4 with respect to the link mechanism 28 or each link mechanism 28.

The continuously variable transmission mechanism 14 is, for example, manufactured by Japanese Patent Publication No. 57-13221.
The friction continuously variable transmission disclosed in the above publication can be adopted. However, a continuously variable transmission composed of other friction rollers, disks, etc. may also be used.

The continuously variable transmission mechanism 14 of this example has the structure disclosed in the above-mentioned publication, and includes a raceway ring 33 attached to the input shaft 17 via a thrust bearing 32, a plurality of conical rotors 34 arranged radially, and Consisting of a speed change ring 35 frictionally engaged with the conical surface 34A of the trochanter 34, and a cylindrical body 36 attached to the output shaft 18 frictionally engaged with the second annular transmission surface 34C of the trochanter 34,
A trochanter 34 that freely supports a speed change ring 35
By sliding it in the axial direction (left and right direction in FIG. 2) on the conical surface 34A of the trochanter 34, the outer circumferential edge of the raceway ring 33 is attached to the first annular transmission surface 34B of the trochanter 34, and the outer circumferential edge of the raceway ring 33 is attached to the second annular transmission surface 34C. Since the outer peripheral edges of the body 36 are frictionally engaged with each other, continuously variable speed in one direction is possible.

The forward/reverse switching mechanism 15 includes a sliding gear 37 slidably fitted onto the output shaft 18 via a spline, and a large diameter gear mounted on an intermediate shaft 38 installed on the side of the output shaft 18. 39A and a small-diameter gear 39B, and a transmission gear 42 on a wheel drive shaft having a bevel pinion in this example, that is, a transmission gear 41 supported below the output shaft 18 via a bearing 40. The transmission gear 42 and the small diameter gear 39B of the reverse gear 39 are configured to engage with each other, and the sliding gear 37 can selectively engage with the transmission gear 42 and the large diameter gear 39A of the reverse gear 39.

The bevel pinion of the wheel drive shaft, that is, the output shaft system 41, is engaged with the crown gear 42A of the differential mechanism 42, and the differential output shaft that is linked to the rear wheels is an axle 43 that is the final output shaft. The wheels can be driven forward or backward.

A conversion mechanism 43 is connected to the continuously variable transmission mechanism 14, and a conversion mechanism 44 is connected to the forward/reverse switching mechanism 15.
It is linked to 0.

The conversion mechanism 43 for continuously variable transmission includes a shifter 46 having a fan-shaped member 45 engaged with the speed change ring 35, the shifter 46 being slidably fitted on the shift rod 47, and further having a winding section on the rod 47. A neutral return spring 48 biases the shifter 46 in the neutral direction.

Then, the lower arm 49A of the vertical shaft 49 supported by the lid 11A of the transmission case is engaged with the engaged portion 46A of the shifter 46, and the upper arm 49A of the vertical shaft 49 is engaged with the engaged portion 46A of the shifter 46.
9B is installed.

Further, the conversion mechanism 44 for switching forward and backward travel includes a shift fork 50 that is engaged with a sliding gear,
Upper and lower arms 53A, 53B are attached to a vertical shaft 52 supported by the lid 11A, and the lower arm 53A is connected to the shift fork 50.
It is configured to be engaged with the engaged portion 50A of.

As shown in FIGS. 3 and 5, the pedal-shaped operating mechanism 10 includes a pedal shaft 55 that is attached to a fixed member 54 on the vehicle body 4 side in the transverse direction (vehicle width direction), and a pedal shaft 55 that is fitted onto the pedal shaft 55. tread portions 56A, 5 at the front and rear.
6B, and an arm 57 projecting downward from the boss of the pedal 56.
The arm 57 and the upper arm 53B of the conversion mechanism 44
and are interlocked and connected by pins 60 and 61, respectively, via a rod 59 having a relay link 58 in the middle.

Further, a shaft 63 is provided on one side of the pedal 56 and is rotatably supported by a fixed cylinder 62 in the front-rear direction. Further, a downward arm 67 is attached to the shaft 63, and the downward arm 67 and the upper arm 49B of the conversion mechanism 63 are connected to each other by a Bowden wire capable of transmitting in the push/pull direction. Pin 69 and nut 70 through 68
are linked together.

Therefore, in this embodiment, the clutch 80 is first disengaged, and then the relay link 58,
The sliding gear 3 is connected to the shift fork 50 of the conversion mechanism 44 via a connecting means such as a rod 59.
7 is slid in the direction indicated by the arrow c in FIG. 6, and can be selected either forward or backward.

When this selection is completed, the clutch 80 is connected. After that, when the pedal 56 is further depressed in the same direction as above, the tread surface of the pedal 56 is moved to the arms 65 and 65.
6, the pedal force (operating force) slides the shifter 46 of the conversion mechanism 43 in the direction of arrow d in FIG. It is said that the speed is continuously variable.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and for example, the gear shift switching operation mechanism is not limited to a pedal type but may be a manually operated lever type.

<Effects of the Invention> According to the present invention, switching between forward and backward directions and continuously variable speed can be performed by simply swinging the operating tool around a single axis, and the operation is extremely simple and there is no risk of erroneous operation. Nor. Moreover, the interlocking between the operating tool and the continuously variable transmission mechanism is such that one shaft is rotatably supported.
It is only necessary to provide a pair of arms extending from this shaft, and the structure can be implemented with a simple structure.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is an overall side view, FIG. 2 is an elevational sectional view of the inside of the transmission case, and FIG. 4 is a view taken along the line BB in FIG. 2, FIG. 5 is a front view of the operating mechanism, and FIG. 6 is a view taken along the line C-C in FIG. 2. 6...engine, 10...speed change operation mechanism,
14... Continuously variable transmission mechanism, 15... Forward/reverse (forward/reverse) switching mechanism, 59, 68... Connection means, 46...
...Shifter, 50...Shift fork, 80...Clutch.

Claims (1)

[Claims] 1. An operating tool 56 that is swingable around a shaft 55 and has portions 56A and 56B that extend forward and backward in the radial direction of the shaft 55; a shaft 63,
a pair of arms 65 and 66 extending from the shaft 63 along the shaft 55;
The forward/reverse switching mechanism 15 is caused to move forward or backward by swinging the operating tool 56 in one direction.
The pair of arms 65, 6 are interlocked and connected so as to move forward and backward in the other direction by swinging in the other direction.
6 is engaged with a portion extending from the shaft 55 of the operating tool 56 in one direction in the radial direction, such that the shaft 63 rotates in one direction when the operating tool 56 swings in one direction. The other of the arms 65 and 66 has a portion extending from the shaft 55 of the operating tool 56 in the other direction in the radial direction. The shaft 6 is engaged to rotate in the same direction as when the shaft 6 is oscillated.
Reference numeral 3 denotes a speed change switching operation mechanism, which is interlocked and connected to the continuously variable transmission mechanism 14 so as to perform a continuously variable speed operation as the shaft 63 rotates.