JPH02134436A - Gearshift controller - Google Patents

Abstract

PURPOSE:To make assembly and disassembly simple as well as to perform stable on-off operation by fitting each base of paired shift keys on the inner circumference of a shift collar being movably operated along a shift shaft by a shift arm, while having the opposed parts of these bases butted with each other, and supporting them free of opening or closing. CONSTITUTION:A shift arm 8 for speed change is installed in a gear case by a shift shaft 15 and fitted in the outer circumference of a shift collar 9, thus it is able to movably operate this shift collar 9 in the axial direction. This shift collar 9 is installed as being approximated to the outside of a backward gear R. At each position being opposed to each keyway 2 inside the shift collar 9, there are provided with key holding grooves 16 where each circular edge of bases 6, 7 of both shift keys 4, 5 is fitted free of rotation, and each opposed edge of the bases 6, 7 fitted in these key holding grooves 16 is formed into a circular form, making them slide with each other at the central part of a shift shaft 1, and each tip side of these shift keys 4, 5 is supported free of opening or closing so as to make it turn round to both the inside and outside. A spring 3 is situated in an intermediate part between these paired shift keys 4, 5 and is tensed, under pressure, to the side where it is always spread open.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a gear shift operating device, and can be used in traveling transmission devices such as tractors and transport vehicles.

PRIOR ART AND PROBLEMS TO BE SOLVED BY THE INVENTION A speed change transmission device selects a speed change transmission gear by engaging a speed change key while moving it in the axial direction with a rotatable speed change gear on a speed change shaft. The shift arm side end of the shift key protrudes toward one end of the shift shaft and bulges largely outside the width of the gear case, making it easy to occupy a large space.

Means for Solving the Problems In this invention, a transmission shaft +1) on which a transmission gear (F) is mounted is movable along a keyway (2) formed in the axial direction and is expanded and expanded by a spring (3). A pair of shift keys (4) (5
A shift collar (61 (7)) which is moved along the shift shaft (1) by a shift arm (8)
9), and this base +61 +7
) are butted against each other and supported so as to be freely openable and closable.

Function and effect of the invention Each transmission gear (F) on the transmission shaft (1) is always in mesh with the gear on the input side and is in a rotating layer, and the transmission is changed by the shift arm (8) via the shift collar (9). Key (4) 15)
When the shift key (41 (51) is opened outward at all times by the spring (3), the shift gear (F
), and only the engaged transmission gear (F) rotates integrally with the transmission shaft (1), transmits the transmission to the output side, and transmits the traveling transmission. .

This shift key f41 (51) opens and closes against the spring (3) every time it engages and disengages from the shift gear (F).
The base f6) F71 is fitted into the inner peripheral part of the shift collar (9) and is supported so that it can be opened and closed with opposing surfaces facing each other, so assembly and disassembly of the shift key +41 (51) It is simple, can perform stable opening and closing operations, and can shorten the length in the axial direction, simplifying the configuration.

Embodiment In the illustrations in FIGS. 1 to 3, the gear shift shaft (1) is
Both left and right ends are bearing in the transmission case, and a key groove (2) is formed to fit and guide the transmission key +4) +51, which passes through the transmission case perpendicularly along the axial direction, and a spline gear 01 is attached to one end. is forming. On this speed change shaft (1), there are forward gears (Fl), (F2), (F3) of the speed change gear (F) that are always in mesh with the input gear on the input shaft side, and a reverse gear (
A neutral ring (N
), and each forward gear (Fl), (F2), (F3),
The inner peripheral surface of the reverse gear (R) is provided with an engaging portion (1υ07J) to which the gear shift key (4051) is engaged, and the neutral ring (
A groove ring 03 into which the gear shift key +4) F5) fits is formed on the inner peripheral surface of the gear shift key (4) F51.
By engaging with the υ tap, the transmission gears (F) and (R) in the engaged position are rotated together with the transmission shaft (1), and output rotation is performed from the gear θ1 toward the traveling shaft. Also, neutral ring (
When engaged in the groove ring (13) of N), it is in a neutral state where no transmission occurs. A partition ring 04 is provided between each transmission gear (F), and the transmission keys +41 and +51 are connected to this partition ring α4. When it exceeds 01, it separates from the engaging part 01).

A shift arm (8) for shifting gears is mounted on the gear case by a shift shaft (]9, and is fitted onto the outer periphery of a shift collar (9), so that the shift collar (9) can be moved in the axial direction. This shift collar (9) is the reverse gear (R)
Provided close to the outside of the This shift color (9)
The gear shift key (
4) A key holding groove Oe is provided to rotatably fit the arcuate edge of the base (61(7)) in (5), and each key holding groove (
Opposite edges of the base parts (6) and (7) fitted with I9 are formed in an arc shape, and are brought into sliding contact with each other at the center of the shift shaft (1), so that the tip side of the shift key f41 +51 is on the inside, and It is supported so that it can be opened and closed so as to rotate outward. Spring (
3) is located in the middle of the pair of shift keys f4) and (5) and is always tensioned toward the side that opens and expands.

Figure 4 shows the gear shift key (41 (base of 51 + 6) (7)
An arc-shaped recess (5) fl[l is formed on the opposing surface of the base +61 (7), and this recess (2
) (It has a configuration in which a roll (l) is fitted between 111 and 111.

[Brief explanation of the drawing]

The drawings show an embodiment of the invention, with FIG. 1 being a partial front sectional view, and FIGS. 2 and 3 being partial perspective views. FIG. 4 is a front view of a partially different embodiment. In the figure, (1) is the gear shift shaft, (2) is the keyway, and (3) is the spring. (41 (51 is the gear shift key, +61 (71 is the base, (8
) is the shift arm. (9) indicates a shift collar, and (F) indicates a transmission gear. Name of Patent Production Company Iseki Agricultural Machinery Co., Ltd. Representative Takashi Iseki Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A pair of shift keys (4) (5) that are movable along a key groove (2) formed in the axial direction of a shift shaft (1) on which a shift gear (F) is mounted and are opened and expanded by a spring (3). base (6)
(7) to the transmission shaft (1) by the shift arm (8).
A gear shift operation device which is fitted into the inner periphery of a shift collar (9) which is operated to move along the same direction, and which is supported so as to be openable and closable with opposing portions of the base portions (6) and (7) facing each other.