JPS6216536Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a misshift prevention mechanism for a gear shift operation device.
Specifically, a control shaft is supported in the transmission case so that it can freely rotate and move in the axial direction, and the rotation of the shaft performs a select operation, the axial movement of the shaft performs a shift operation, and one forward gear and one reverse gear are controlled. The present invention relates to a misshift prevention mechanism for a speed change operation device in which both are arranged on the same shift operation line.

Conventionally, this type of misshift prevention mechanism was
For example, as shown in Japanese Unexamined Patent Publication No. 54-52267, a cam body is provided on a stationary member near a member that swings when a shift lever is operated, so that it can move freely in and out of the swinging trajectory of the swinging member. While the cam body is always biased to move back and forth by a spring, a connecting rod is pivotally connected to a stationary member near a member that moves reciprocatingly when a shift lever is selected, and the cam body is moved back and forth through the connecting rod. The cam body is operatively connected to a member, and the cam body is advanced in conjunction with a selection operation of the shift lever to a forward/reverse shift operation position, and prevents the rocking member from swinging from a forward gear position to a reverse gear position. However, with the above structure, there are problems such as not only the number of parts is large and it takes time to assemble, but also a large space is required to arrange these many components. It was hot.

The present invention was devised in view of these circumstances, and the purpose is to provide a misshift prevention mechanism that has an extremely simple configuration and does not require a particularly large installation space. .

The present invention will be described below based on embodiments shown in the drawings.

In the figure, reference numeral 1 indicates a gear shift lever that is freely swingably supported on the transmission case 2, and reference numeral 3 indicates a control shaft that selectively engages with a shift fork shaft (not shown) of the transmission housed in the transmission case 2. The free end of the control shaft 3 is interlocked and connected to the lower end of the speed change lever 1 via a connecting arm 30, and the control shaft 3 is rotated by a selection operation of the speed change lever 1. The control shaft 3 is reciprocated in the axial direction by the shift operation of 5 forward gears and 1 reverse gear as appropriate.
It is like changing gears.

That is, as shown in FIG.
After _the control shaft 3 _is rotated in _the direction _X1 in _FIG . Figure 1
By moving in the Y ₁ direction or Y ₂ direction, the first
speed or second speed can be obtained, and the speed change lever 1
By shifting the control shaft 3 from the _N0 position to the _F3 or _F4 position, the third or fourth speed can be obtained by moving the control shaft 3 in the _Y1 direction or _Y2 direction in FIG. gear lever 1
After rotating the control shaft 3 in the _X2 direction in FIG. 2 by selecting from the _N0 position to the _N2 position, the control shaft 3 is rotated by shifting the gear shift lever 1 to the _F5 or R position. Figure 1
By moving in the Y ₁ direction or Y ₂ direction, the 5th
speed or reverse speed can be obtained.

Therefore, the present invention provides the above-mentioned speed change operation device,
A control shaft 3 is supported in the transmission case 2 so as to be freely rotatable and axially movable, and the rotation of the shaft performs a selection operation, the axial movement of the shaft performs a shift operation, and one forward gear and one reverse gear are controlled. A misshift prevention mechanism for a speed change operation device disposed on the same shift operation line as the control shaft 3, the control shaft 3 having a first control surface 4 facing in the select operation direction.
1 and a second control surface 42 facing the shift operation direction, and an elastic body 5 having an elastic part 51 formed by bending a plate-like member into a hairpin shape. The first end of the control arm 4 is fixed to a stationary member, and the second end thereof is bent into an L-shape.
1 contacts and is elastically deformed.
and a first contact portion 54 that faces the second control surface 42 of the control arm 4 and comes into contact with the shift operation to the reverse gear after the shift operation to the forward gear at the select position. When the stationary member is shifted to the reverse gear at the select position, the second contact portion 54 comes into contact with the elastic body 5.
A stopper 62 was installed to limit the deformation of the cylinder.

That is, in the embodiment shown in the figure, a control arm 4 extending radially outward of the control shaft 3 is fitted to the free end of the control shaft 3, and the forward/reverse gear selection position N ₂ of the control arm 4 is fitted.
A first control surface 41 is provided on the front surface in the direction of rotation (X ₂ direction in _FIG . Each is provided.

The elastic body 5 shown in the figure is made of a metal plate with elasticity, and a substantially hairpin-shaped elastic part 51 is bent and fixed to the first end of the elastic part 51 by the metal plate. This fixing part 52 is sandwiched between the mounting plate 6 and bolts 71 and screws 7 on the transmission case 2 which is a stationary member.
2, it is fixed to the case 2 together with the mounting plate 6.

The second elastic part 51 in this elastic body 5
The control shaft 3 is bent at the end into an L-shape.
a first contact portion 53 that the first control surface 41 of the control arm 4 comes into contact with when the control arm 4 rotates to the forward/reverse gear selection position _N2 ; and a predetermined forward gear of the control shaft 3
A second contact portion 54 is provided with which the second control surface 42 of the control arm 4 comes into contact only when moving from _F5 to the reverse gear R direction, thereby rotating the control shaft 3 to the forward/reverse gear selection position _N2. During the movement, the first contact portion 53 is elastically displaced via the first control surface 41, and the first contact portion 53 is moved only when the control shaft 3 is shifted from the select position _N2 to the forward gear F. The detachment of the first control surface 41 causes the first contact portion 53 to return to its original position, while the forward stage F ₅ of the control shaft 3
The second contact portion 54 is configured to be elastically displaced via the second control surface 42 during a shift operation from to the reverse gear R direction.

On the other hand, the first contact portion 53 is provided on the mounting plate 6.
A first stopper piece 61 capable of receiving the lower surface of the control shaft 3 receives the second contact portion 54 during a shift operation of the control shaft 3 from the forward gear F ₅ to the reverse gear R direction, and receives the second contact portion 54 . A second stopper piece 62 is integrally formed to prevent the shift operation.

Therefore, the forward gear F ₅ of the control shaft 3
When shifting from R to reverse gear, the second contact portion 54 contacts the first control surface 41 of the control arm 4.
Elastic displacement is allowed by a distance commensurate with the wrap distance S between the first contact portion 53 and the first contact portion 53.

In the figure, reference numeral 11 denotes a boot that covers the lower end of the gear shift lever 1.

The misshift prevention mechanism of the present invention is constructed as described above, and FIGS. 1 and 6 show the shift lever 1.
is located at the N ₀ position.

When the shift lever 1 is selected from this position to the _N2 position, the control shaft 3 rotates in the _X2 direction in FIG. By pressing the first contact portion 53 of the elastic body 5, the first contact portion 53 is elastically displaced as shown in FIG.

When the gear shift lever 1 is shifted to the _F5 position from this state, the control shaft 3 shifts to the position shown in FIG.
Since the first control surface 41 moves in the _Y1 direction and separates from the first contact portion 53, the first contact portion 5
3 returns to its original position as shown in FIG.

Next, after shifting the gear shift lever 1 to the predetermined forward gear position _F5 as described above, when further downshifting to other forward gear positions ( _F1 to _F4 ) or returning to the neutral position _N0 , As the shift lever 1 is operated from the _F5 position to the _N2 position, the control shaft 3 moves in the _Y2 direction in FIG. After being pressed by the second control surface 42 of the control arm 4 and elastically displaced by a predetermined amount, it comes into contact with the second stopper piece 62 of the mounting plate 6 as shown in FIG. ₂
Prevent movement in the direction.

Therefore, even if the shift lever 1 can be selectively operated in the _N0 direction from the _N2 position, overshifting to the R position is reliably prevented.

On the other hand, when the shift lever 1 is selected from the _N0 position to the _N2 position as described above and then shifted to the R position, the control shaft 3 moves in the _Y2 direction in FIG. As shown in , the first control surface 41 of the control arm 4 keeps pressing the first contact portion 53 of the elastic body 5, so that the shift lever 1 is moved from the reverse gear position R to the neutral position _N0 or the forward gear shift position. (F ₁ to F ₅ ) can be freely switched.

As described above, according to the misshift prevention mechanism according to the present invention, an elastic body formed by bending a plate-like member into a hairpin shape is used, and the first end of this elastic body is fixed to a stationary member. The support structure for the elastic body is simple, and the overall structure can be simplified. As a result, when the misshift prevention mechanism is incorporated into a transmission, it is not only easy to assemble, but also requires less space for assembly. Therefore, the gear shift operating device can be made compact.

Furthermore, the second end of the elastic body is bent into an L-shape to form a contact portion with which the first control surface of the control arm contacts and elastically deforms the elastic portion when operating to the forward/reverse gear selection position. After shifting to forward gear at the select position, when shifting to reverse gear, the second control surface of the control arm comes into contact and the elastic part is elastically deformed. This prevents the application of excessive force that would cause plastic deformation to the elastic body, thereby significantly improving durability.

Furthermore, since the stationary member is provided with a stopper that comes into contact with the second contact portion and limits deformation of the elastic body when shifting from the forward gear to the reverse gear at the select position, the stopper is provided to limit the deformation of the elastic body. Even if a strong shift operation is performed, deformation of the elastic body is reliably prevented, and a shift operation to the reverse gear, that is, a misshift operation, is reliably prevented.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, FIG. 1 is a partially cutaway side view, and FIG.
3 is a perspective view of the elastic body, FIG. 4 is a perspective view of the mounting plate, FIG. 5 is a shift pattern diagram of the gear shift lever, and FIGS. 6 to 10 are explanations of the operation of the misshift prevention mechanism of the present invention. It is a diagram. 1... Gear shift lever, 2... Mission case (stationary member), 3... Control shaft, 4... Control arm, 5... Elastic body, 6... Mounting plate.

Claims (1)

[Scope of utility model registration request] A control shaft is supported in the transmission case so as to be freely rotatable and axially movable, and the rotation of the shaft performs a selection operation, and the axial movement of the shaft performs a shift operation, and one forward gear and one reverse gear are selected. A control arm that is a misshift prevention mechanism for a speed change operation device arranged on the same shift operation line, and has a first control surface facing the select operation direction and a second control surface facing the shift operation direction on the control shaft. At the same time, an elastic body having an elastic part formed by bending a plate-like member into a hairpin shape is provided, a first end of the elastic body is fixed to a stationary member, and a second end is bent into an L-shape. When the control shaft is moved to the forward/reverse gear select position, the first control surface of the control arm contacts and elastically deforms the first control surface.
a contact portion, and a second contact portion that faces the second control surface of the control arm and comes into contact with the shift operation to the reverse gear after the shift operation to the forward gear at the select position, while the stationary member A misshift prevention mechanism for a transmission operating device, characterized in that a stopper is attached to the second contact portion to limit deformation of the elastic body during a shift operation to a reverse gear at the select position.