JPH08188061A - Transmission of tractor and like - Google Patents

Abstract

PURPOSE: To make a gearshift lever easy to operate for shifting the speeds of a tractor, a combine and the like. CONSTITUTION: A gearshift lever 3 is coupled at its end to the end of a shifter rod 2 by a hinge joint 4 and can be operated along and about the axis of the shifter rod 2 which has a shifter arm inside a transmission case 6. Also, a swing rod 5 extending in almost the same direction as or in a perpendicular direction to the shifter rod 2 is pivotally supported 7 at one end against a support member in such a way as to freely oscillate, and a portion of the gearshift lever 3 is pivotally mounted on the other end of the swing rod by a ball joint 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed change operation device for changing the traveling speed of a tractor, a combine, a seedling planting machine, a transport vehicle and the like.

[0002]

2. Description of the Related Art A swing fulcrum is provided at an intermediate portion of a shift lever to swing in a left-right direction and a front-rear direction to shift gears. , The distance between the swing fulcrum of the gear shift lever and the engaging portion such as a shifter or a shift rod that is engaged and operated by the tip of the gear shift lever changes, and the tip of the gear shift lever engages with the engaging portion with respect to the position. Will be deviated, the sliding resistance will be large, and it will be difficult to maintain smooth gear shifting operation.

[0003]

According to the present invention, a tip end of a shift lever 3 is connected to a tip end of a shifter rod 2 having a shifter arm in a mission case 6 by a hinge joint 4, and the shifter rod 2 is axially moved. In addition, the swing rod 5 can be operated in the axial direction, and one end of a swing rod 5 in a direction substantially the same as or orthogonal to the shifter rod 2 is pivotally supported 7 with respect to a support member, and the other end of the swing rod 5 A shift operation device such as a tractor in which a middle portion of the lever 3 is pivotally attached by a ball joint 8 is configured.

[0004]

[Operation and Effect of the Invention] The gear shift lever 3 can be rotated to the left and right and to the front and rear to selectively operate each gear shift position. Assuming that the shifter rod 2 and the swing rod 5 are provided in the lateral direction with respect to the mission case 6, for example, when the gear shift lever 3 is operated in the lateral direction, the swing joint is made by the ball joint 8 in the middle portion. Since it is supported by the rod 5, the hinge joint side of the speed change lever 3 on the tip end side is operated laterally as a lever to push and pull the shifter rod 2 laterally. At this time, the vertical distance between the parallel swing rod 5 and the shifter rod 2 changes, but since the tip ends of these are constantly connected by the speed change lever 3 including the ball joint 8 and the universal joint 4, the swing is changed. Since the rod 5 is swung around the pivot portion 7 at the base end, the position of the ball joint 8 can be smoothly changed.

When operating the shift lever 3 in the front-rear direction, the shift lever 3 is pivoted back and forth around the hinge joint 4 and the shifter rod 2 at the tip end to move the shifter arm 1 into the shifter rod 5.
Rotate around. At this time, the intermediate portion of the shift lever 3 is supported by the tip of the swing rod 5 by the ball joint 8, and the swinging of the swing rod 5 around the pivotal support portion 7 allows the swinging movement in the front-rear direction to be free, and further, this swinging movement. Support and guide the trajectory.

As described above, the transmission lever 3 is stable because the middle portion and the tip portion thereof are continuously connected to the lateral ends of the swing rod 5 and the shifter rod 2 by the ball joint 8 and the hinge joint 4. The support structure can be provided, and an accurate and smooth gear shift operation can be performed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an example of use as a tractor, a tractor vehicle body 9 has an engine under a hood 10 at a front portion, and a clutch housing 11 from the engine body to a rear portion.
The transmission case 6 and the like are connected to each other, and a front wheel 13 steerable by a steering handle 12 and a rear wheel 15 and the like located on the left and right outer sides of the rear portion of the cockpit 14 are axially mounted. It is configured as a four-wheel drive traveling mode in which the and are driven. 16 is a fender, 17
Indicates a safety frame, and 18 indicates a lower link.

The shift lever 3 is located on the left side of the cockpit 14 through a lever guide 19 formed on the fender 16.
The lower end is connected to the shifter rod 2 on the side of the mission case 6 via a hinge joint 4 (a universal joint). The shift lever 3 serves as a main shift lever and can shift the main shift device in the mission case 6. Also, 20
Is a sub-transmission lever that can shift the sub-transmission.

The shifter rod 2 is provided on the upper side of the mission case 6 so as to extend in the lateral direction, and the left end thereof is projected outward. The shifter rod 2 is rotatable and slidable in the axial direction, and has a shifter arm 1 in the mission case 6. By moving the shifter arm 1 in the axial direction, a shifter 22 provided in the shifter stay 21 is provided. The shifter 22 or 23 thus engaged is selectively engaged with the shaft 23, and is moved along the shifter stay 21 by pivoting about the shaft to perform a predetermined gear shift.

The speed change lever 3 comprises a lower lever 24 and an upper lever 25 connected to the upper end of the lower lever 24, and the lower end of the lower lever 24 has a hinge joint 4 made of a T-shaped socket.
It is connected to the shifter rod 2 via. The T-shaped vertical hole portion 26 is fitted into the shifter rod 2 so as to be rotatable, and the tip end portion 28 of the lower lever 24 formed in the L-shape in the lateral hole portion 27 is pivotally fitted to allow the lower lever 24 to be rotated. Is configured to be rotatable in both left and right and front and rear directions.

Further, a bracket 29 is provided on the upper end of the lower lever 24, and the bracket 31 of the upper lever 25 is superposed and tightened with a bolt or the like to form an integral structure. A joint pin 33 of the ball joint 8 provided at one end of the swing rod 5 is fitted into a pin hole 32 provided in the bracket 29, and is jointly tightened with a nut 34 to be fixedly connected together with the bracket 31 and the like.

The swing rod 5 is connected by a ball joint 7 with a seat floor 37 mounted above the transmission case 6 and a hydraulic case 36 pivotally supporting the lift arm 30 as a supporting member. The joint pin 38 of the ball joint 7 is fixed to the seat floor 37 by tightening a nut 39 or the like, and the ball joint 8 side of the swing rod 5 is swingable around the ball joint 7. The swing rod 5 and the shifter rod 2 are provided parallel to each other in the lateral direction.

Reference numeral 40 denotes a shifter guide for guiding the shifter arm 1. The pattern of the lever guide 19 which forms a guide groove corresponding to the lever guide 19 has, for example, an H-shaped guide groove, With the left and right strokes set to the neutral position, the shift lever 3 moves left and right to guide the shifter arm 1 in the left and right directions.
The stroke in the front-rear direction can be switched to the forward first speed, the second speed, and the third speed position and the reverse first speed position, and the shifter 22 or 23 can be engaged to switch and move. Reference numeral 41 is a shift shaft, and a main shift synchro clutch which is shifted by the shifters 22 and 23 is arranged. Reference numeral 42 denotes a cover that is attached to and detached from the side portion of the mission case 6 and has the shifter rod 2 mounted thereon. 43 is the mounting bolt.

5 to 7, the difference from the above example is that
The hinge joint 4 is provided in a direction orthogonal to the direction of the swing rod 2, that is, in the front-rear direction. Therefore, the hinge joint 4 is replaced by the universal joint of the above example and has a U-shape fixed to the tip portion of the shifter rod 2. The hinge socket 44 is composed of a hinge socket 44 and a hinge pin 45 parallel to the shifter rod 2 with respect to the hinge socket 44.
6 is pivotally mounted around this hinge pin 45. A bracket 31 is integrally provided in the middle of the upper lever 25 and is connected to the joint pin 33 of the swing rod 5.

When the upper lever 25 is operated in the left and right directions, the lever boss 46 and the hinge socket 44 are integrally moved, so that the shifter rod 5 is moved in the left and right axial directions to move the shifter arm 1. At this time, in the swing rod 5, the ball joint 8 is pivoted to the left and right around the pivot portion 7. Therefore, the upper lever 25 takes an arc-shaped operation rotation locus by the rotation of the swing rod 5, but is absorbed by the rotation of the hinge joint 4 around the hinge pin 45.

When the upper lever 25 is operated in the front-rear direction, the intermediate portion of the upper lever 25 is supported by the ball joint 8 of the swing rod 5, so that the lever boss 46 at the lower end is moved to the swing rod 5. The pivot socket 7 and the ball joint 8 are pivoted back and forth to pivot the hinge socket 44 around the shifter rod 2. As a result, the shifter arm 1 is rotated back and forth to shift the engaged shifter 22 or 23.

[Brief description of drawings]

FIG. 1 is a front view of a shift lever portion.

FIG. 2 is a side view thereof.

FIG. 3 is an exploded perspective view thereof.

FIG. 4 is a side view of the tractor.

FIG. 5 is a front view of a shift lever portion showing another embodiment.

FIG. 6 is a side view thereof.

FIG. 7 is an exploded perspective view thereof.

[Explanation of symbols]

 1 Shifter Arm 2 Shifter Rod 3 Shift Lever 4 Hinge Joint 5 Swing Rod 6 Mission Case 7 Pivot 8 Ball Joint

Claims (1)

[Claims] 1. A hinge joint 4 connects a tip end portion of a shift lever 3 to a tip end portion of a shifter rod 2 having a shifter arm in a mission case 6 so that the shifter rod 2 can be operated in an axial direction and an axial direction. At the same time, one end of the swing rod 5 in a direction substantially the same as or perpendicular to the shifter rod 2 is pivotally supported 7 with respect to the support member,
A gear shift operation device such as a tractor in which a middle portion of the gear shift lever 3 is pivotally attached to a ball joint 8 at the other end.