JPH07132752A - Shift operation device for tractor - Google Patents

Abstract

PURPOSE:To increase the degrees of freedom of installation of a shift lever by a method wherein a lever bracket is mounted on one side of a transmission case between the transmission case and a fender located thereoutside and various shift levers inside and outside the lever bracket are operably supported. CONSTITUTION:An auxiliary shift lever 4 and a power taking-out shift lever 5 are attached to a lever bracket 3 mounted below a shift floor 9 and on the left side of a front transmission case 1. Through operation of the auxiliary shift lever 4, an arm shaft 15 is moved or rotated axially or around an axis. A shifter arm fixed to the inner end of the arm shaft 15 is selectively engaged with some one of a plurality of shifters to perform auxiliary shift operation. A power taking-out shift lever 5 is engaged with one of two operation arms through lateral inclination in the direction of a support axle 23 and this operation causes selective operation of the power taking-out shift device. Further, movement of each operation arm drives the arm 28 of each arm shaft 27 of a rear transmission case 6 through a lot 26.

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 such as a tractor, and a lever bracket which can operably attach and support a plurality of speed change levers to facilitate the arrangement and operation of the speed change levers.

[0002]

2. Description of the Related Art In a structure in which a gear shift lever is attached to a bracket and is supported, a plurality of gear shift levers are arranged only on one side of the bracket. The relational position of is limited,
It is easy to operate the lever, which makes it difficult to operate.

[0003]

According to the present invention, a lever bracket 3 is mounted on one side of a mission case 1 and between the outer side fender 2 and various transmission levers 4, 4 inside and outside the lever bracket 3. 5 is a configuration of a speed change operation device such as a tractor that operably supports.

[0004]

The operation and the effect of the invention The lever bracket 3 is mounted on the outer surface of the transmission case 1 between the fender 2 and the transmission levers 4 and 5 are mounted and supported on the inside and the outside of the lever bracket 3, respectively. For this reason, the gear shift levers 4 and 5 are arranged so as not to interfere with each other when the gear shift operation is performed in the front-rear direction along the lever bracket 3, and the gear shift levers 4 and 5 are crossed in a side view. It is possible to operate even in such relational positions, the degree of freedom in installing the speed change levers 4 and 5 is increased, and the lever bracket 3 and the speed change levers 4 and 5 are provided between tractor bodies having different specifications, models, transmissions, and the like. It becomes easier to share the same.

[0005]

EXAMPLE A tractor vehicle body includes a clutch housing extending from a front engine to a rear rear transmission case 6,
A front transmission case 1 is connected, and a main transmission device, a sub transmission device, and a power take-out transmission device that change the speed of the power transmission device are provided from the inside of the clutch housing to the inside of the front mission case 1. .

Fenders 2 for covering the rear wheels are attached to a frame 7 provided along the front-rear direction on the left and right outer sides of the mission cases 1 and 6, respectively.
The hydraulic case 8 on the rear mission case 6
A pilot's seat 10 is mounted on the seat floor 9 so as to cover the vehicle. On the left side of the front mission case 1 below the seat floor 9, the lower end portion of the lever bracket 3 is attached with a bolt 11, and the upper portion of the lever bracket 3 is an intermediate portion between the outer surface of the front mission case 1 and the fender 2. Located in. An auxiliary shift lever 4, a power take-out shift lever 5 and the like are attached to the lever bracket 3.

Of these, the sub-transmission lever 4 is located on the outer front part of the lever bracket 3 and is attached by a support metal 12 by bolts 13. The sub-transmission lever 4 has a ball seat 14 and can swing in any direction with respect to the support metal 12. The lower end of the fortune transmission lever 4 is fitted into a socket arm 16 which is integrated with an arm shaft 15 protruding to the left side of the transmission case 1, and the auxiliary transmission lever 4 is attached.
The arm shaft 15 can be moved or rotated in the axial direction and about the axis by the operation of the. The shifter arm 17 fixed to the inner end of the arm shaft 15 allows the shifters 18, 19 to move.
The auxiliary shift operation can be performed by switchingly engaging with.

The upper end portion of the auxiliary transmission lever 4 can be operated by guiding it to a lever guide 20 provided along the inside of the aender 2 on the seat floor 9, and the upper end grip portion can be pushed with a thumb. Push button 2 that can be turned on and off
A shift switch of the 1st, 22nd type is provided, and each time the push button 21 is pressed, the speed of the main transmission can be increased step by step.
Each time you press, you can decelerate by one step. By operating such a shift switch, the main transmission can switch gears by switching solenoid valves and operating shifters according to output from the controller to switch synchro clutches.

The power take-off transmission lever 5 is provided on the seat floor 9
Of the power take-off and shifting lever 5 in the direction of the support shaft 23. By tilting this support shaft 2
It is possible to engage with the operation arms 24 and 25 which are rotatable about three directions, whereby the power take-out transmission can be selectively operated. The operation arms 24 and 25 are connected to the arms 28 of the arm shafts 27 and 28 of the rear mission case 6 via the lot 26. The arm shafts 27 and 28 are configured to interlock with the shifter of the power take-out transmission in the rear mission case 6.

A support shaft 23 for the power take-out gear shift lever 5
Is fixed to the lever bracket 3 by a pin 29, and a lever guide 30 for guiding the movement of the lever 5 is fixed to the lever bracket 3 by a bolt 31. In such a structure, the support metal 12 for mounting and supporting the auxiliary transmission lever 4
A bolt hole A is provided in the lever bracket 3 at a position slightly displaced from the mounting position of the bolt 13, and in the specification in which the main transmission is operated by the main transmission lever, the support metal of the main transmission lever is provided in this bolt hole. Attach to A.
At this time, the support metal 33 of the auxiliary transmission lever 32 is attached to the bolt hole B on the rear side. The sub gear shift lever 33 is not provided with a push button gear shift switch. When the main shift lever and the sub shift lever 32 are mounted, arm shaft holes 34 and 35 for supporting an arm shaft having a socket arm operated by these are formed in the lower portion of the lever bracket 3. .

In FIGS. 3 and 4, in the reverser operation mechanism for switching the reverser in the clutch housing 36, the interlocking rod 37 is provided in a substantially horizontal shape so that a smooth operation can be performed. The arm shaft 38 is vertically directed to the upper center of the clutch housing 36 and attached by a support metal 39, and a shifter is provided at the lower end of the arm shaft 38 to switch the reverser from neutral N to forward F and backward R. It is designed to be able to.

The steering post 40 includes a steering shaft 41 and a reverser shaft 42 having a reverser lever.
Is supported by a shaft cylinder 53, and the lower end portion of the reverser shaft 42 is connected to a vertical shaft 47 supported on the clutch housing 36 via a universal joint 43, a substantially vertical shaft 44, a universal joint 45, and the like. Be connected. The lower end of the shaft 47 and the upper end of the arm shaft 38 are respectively connected to the arms 4
8 and 49 are fixed, and the arms 48 and 49 are connected to each other through a ball joint in a substantially horizontal state by an interlocking rod 37 which is adjustable in expansion and contraction. By rotating the reverser lever back and forth, the arm 48 is rotated through the reverser shafts 42, 44, 47, and further the interlocking rod 37, the arm 49, the arm shaft 38, etc. are rotated to switch the reverser. To do.

Reference numeral 50 denotes a housing cover for covering the upper side of the clutch housing 36. An opening is formed in the upper side where the reverser shaft 47, the interlocking rod 37, etc. are located, and a lid 46 that can open and close the opening is removable. It is provided in. The reverser shaft 47 at the lower end is attached to and supported by the cover 50 by a metal 51. 52 is a cover,
It is attached so as to cover between the steering post 40 and the housing cover 50.

The reverser shafts 44, 47 and the like can be moved to the positions shown by the phantom lines in FIG. 3 to make the clutch housings of different model specifications compatible with each other. 5 to 7, a point different from the above example is that a position sensor 55 for detecting the operation position of the reverser lever 54 is provided on the upper portion of the steering post 40 to perform operation position display or control interlocking. The reverser lever 54 is provided below the steering handle 56 on the left hand side. This base portion is attached to the upper end portion of the reverser shaft 42 in the steering post 40 so as to be vertically swingable by a pin 57, and when it is rotated from the neutral N position to the front side, it is in the forward F position, and when it is rotated to the rear side, it is in the reverse direction. The reverser shaft 42 and the like are rotated so that the reverser can be switched to the R position.

At the upper end of a shaft cylinder 53 that rotatably supports the reverser shaft 42, a fixed plate 59 that is integral with a shaft cylinder 58 that rotatably supports the steering shaft 41 is provided. A cam plate 60 integrated with the reverser shaft 42 can rotate along the upper surface of the 59. The rotation of the cam plate 60 allows the position sensor 55 attached to the fixed plate 59 via the bracket 61 to detect a specific position.

A clip ball 62 is attached to the fixed plate 59.
Is provided, and a detent mechanism for each position of neutral N, forward F, and reverse R is configured between the detent mechanism and the clip hole 63 formed on the lower surface of the cam plate 60. Reference numeral 64 is a spring, and the cam plate 60 and the reverser lever 5 are provided around the reverser shaft 42.
It is tensioned between the four bases and presses the reverser lever 54 to the lower side of the neutral N position.

A guide plate 65 for guiding the reverser lever 54 is attached to the shaft cylinder 58, and the lever 54 is operated along a guide groove 66 of the guide plate 65. The guide groove 66 is formed in a T-shape that is inclined forward and backward and projects downward with the middle portion as the neutral N position. The front end is in the forward F position and the rear end is in the reverse R position.

On the upper surface of the outer peripheral portion of the cam plate 60,
The neutral surface 60N corresponding to the flat neutral N position, the forward surface 60F inclined upward to correspond to the forward position, and the neutral surface 6
Reverse surface 6 corresponding to the reverse R position by recessing from 0N downward
0R and each of these surfaces 60N, 60F, 60R
The position sensor 55 faces the upper side surface of the rotation locus of
Is provided, and the ball 67 is interposed. By rotating the cam plate 60 with the reverser lever 54, the ball 67 is moved up and down, and the three-stage position switch 55 is turned on and off.

[Brief description of drawings]

FIG. 1 is a side view.

FIG. 2 is a front view of a part thereof.

FIG. 3 is a side view of a clutch housing portion.

FIG. 4 is a plan view of a part thereof.

FIG. 5 is a side view of a steering post part showing another embodiment.

FIG. 6 is a rear view thereof.

FIG. 7 is a plan view thereof.

[Explanation of symbols]

 1 mission case 2 fender 3 lever bracket 4 speed change lever 5 speed change lever

Claims (1)

[Claims] 1. A lever bracket 3 is attached to one side of a mission case 1 between the outer side fender 2 and the outer side fender 2, and various shift levers 4 and 5 are operably supported inside and outside the lever bracket 3. Gear change operation device such as tractor.