JPH0517507Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is one of several control shafts.
This invention relates to a shift operation mechanism for a transmission that is simplified in structure and reduced in cost by providing a check mechanism in the book.

[Background technology]

As a gear change operation mechanism for a vehicle transmission, for example,
A predetermined shift shaft is selected via the control shaft by actuation of a select actuator (e.g., pneumatic type), and the selected shift shaft is activated by a shift actuator (e.g., pneumatic type).
Gear ratio selected by (including reverse drive)
It has been proposed that a predetermined speed change operation is performed by shifting in the direction of the gear.

According to the shift operation mechanism of this transmission, for example,
In the case of a 6-speed transmission mechanism, there are two control shafts and four shift shafts.
Each control shaft corresponds to two shift shafts, and one of the two corresponding shift shafts is selected by actuation of one of the two selection actuators. On the other hand, three of the four shift shafts are
The gear ratios are shifted by shift actuators to obtain two gear ratios, and the remaining one
The shift shaft of the book is designed to be able to shift in the direction of the reverse gear. Each shift shaft has a 3
It has a double check groove to stabilize the three shift positions (two positions for the reverse shift shaft).

[Problem that the invention attempts to solve]

However, according to the shift operation mechanism of this transmission,
Since all shift shafts are equipped with a check mechanism, there is a limit to the simplification and cost reduction of the configuration.

[Means and actions for solving problems]

The present invention was developed in view of the above, and in order to simplify the configuration and reduce costs by providing a check mechanism on one of the multiple control shafts, a single shift actuator is used. The present invention provides a shift operation mechanism for a transmission in which a single check mechanism provided on one control shaft is shared by connecting a plurality of control shafts that are shifted together by a connecting member.

〔Example〕

Hereinafter, the shift operation mechanism of the transmission according to the present invention will be explained in detail.

1 to 3 show an embodiment of the present invention,
Inside the case 1, there are provided four shift shafts 2, 3, 4, and 5 arranged in parallel, and two control shafts 6 and 7 arranged in parallel and shifted in the length direction. Shift shaft 2 is 5
Shift shaft 3 is for 3rd and 4th speeds.
The shift shaft 4 connects the gear ratios of 1st speed and 2nd speed, and the shift shaft 5 connects the gear ratios of reverse. Each of the shift shafts 2 to 5 connects a sleeve (not shown) of the gear connection portion to a predetermined position. Shift fork 2A, 3 to shift in the direction of the gear ratio.
A, 4A, and 5A (only fork 3B of shift fork 3A is shown). On the other hand, the control shafts 6 and 7 are the shift shafts 2 and 3.
A piston rod 10, which has select levers 8, 9 projecting between the piston rods 4 and 5 and between the shift shafts 4 and 5, and ball members 12, 13 which receive piston movements of piston rods 10, 11, which will be described later, and which assumes three positions. The select lever 8 is rotated around the axis by the piston movement of 11.
Rotate 9 left and right by a predetermined angle. The aforementioned shift shafts 2 to 5 are connected to select levers 8 and 9.
It has engaging surfaces 2a to 5a that engage with it by rotation of. The piston rods 10, 11 are moved by the select actuators 14, 15, and the ball members 12, 11 are moved through the grooves 16a, 17a.
It has engaging members 16 and 17 that engage with 13 at its tip. On the other hand, the control shafts 6 and 7 are connected by a connecting member 18 so that they can move together, and the control shaft 7 is continuous with the piston rod 21 of the shift actuator 20. The control shaft 7 has three check grooves 7a, 7b, and 7c provided at the tip thereof corresponding to the three shift positions, and a stopper ball 19a that fits into these three check grooves and a stopper ball 19a on the top thereof. It is provided with an elastic member 19b that pushes the ball 19a toward the control shaft 7 (the elastic member 19b is attached to the case 1
). The shift actuator 20 is provided on a cylinder 22 having a shoulder portion 22a and a piston rod 21,
a first piston 23 having a shoulder portion 23a;
The second piston 24 is loosely fitted around the outer periphery of the piston 23, and the tip thereof has a shape that fits the shoulder 23a (description of the packing etc. shown in the drawings will be omitted). Note that the select actuators 14 and 15 are the shift actuator 20.
Since it has the same configuration as , the explanation is omitted, and
In FIGS. 1 and 2, explanations of parts not directly related to the operation of the present invention are omitted.

The operation of the above configuration will be explained with reference to FIGS. 4 and 5. Figure 4 shows 1st speed~
The shift position pattern for 6th gear and reverse R is shown, and after selecting select points P ₀ to _{P 3} in the direction of arrow A (corresponding to selection of shift shafts 2 to 5 using select levers 8 and 9), the shift position pattern is shown in the direction of arrow B. By shifting to (corresponding to a shift movement of any one of shift shafts 2 to 5), a gear connection with a predetermined speed ratio can be obtained.

For example, when a fifth gear speed ratio is commanded from the driver's seat by operating a lever, the command is processed by a control section (not shown), and a control signal for controlling the selection actuator 14 is output from there.
Through this control, piston control is performed within the cylinder, and the actuator 14 is
Piston rod 1 from the neutral state shown in the figure.
0 changes to the most protruding state, whereby the select lever 8 rotates counterclockwise and engages with the engagement surface 2a of the shift shaft 2, and the shift shaft 2 is selected. Next, when a control signal for controlling the shift actuator 20 is output from the control section, piston control is performed within the cylinder 22, and the actuator 20 is in the neutral state (first and second) shown in FIG. piston 23,
24 are in close contact with each other, and the second piston 24 is in contact with the shoulder 22a.
The piston rod 21 changes from the state shown in FIG. The check groove 7c is pushed by the elastic member 19b beyond the protrusion 7e between 7b and 7c.
The shift position is determined by meshing with each other.
At the same time, the control shaft 6 moves in the direction of the arrow (FIG. 2) via the connecting member 18.

When the control shaft 6 moves, the select lever 8 engages with the engagement surface 2a, causing the shift shaft 2 to move in the direction of the arrow (Fig. 2), and this movement causes the shift fork 2A to move the gear coupling sleeve (not shown) in the direction of fifth gear coupling. By the above operations, the fifth gear ratio is obtained. Meanwhile, other gear ratios can be achieved by repeating the above-mentioned select and shift operations. For example, when selecting fourth gear from the neutral state, the select actuator 14 retracts the piston rod 10 to its fullest extent, and the shift actuator 20 protrudes the piston rod 21 to its fullest extent, in order to select the shift shaft 3. At this time, the stopper ball 19a comes out of the check groove 7b and moves to the protrusion 7b.
d and engages with the check groove 7a, stabilizing the positioning of the shift position.

[Effect of idea]

As explained above, according to the shift operation mechanism of the transmission of the present invention, a plurality of control shafts that are shifted by a single shift actuator are interconnected by a connecting member to form a single control shaft. Since the single check mechanism provided is shared, the configuration can be simplified and costs can be reduced by providing the check mechanism in one of the plurality of control shafts.

[Brief explanation of drawings]

1 to 5 show an embodiment of the present invention, in which FIG. 1 is a sectional view showing the relationship between the control shaft and the shift shaft, FIG. 2 is a plan view of the entire structure, and FIG. 4 is a side view of the whole, FIG. 4 is a pattern diagram of a gear ratio, and FIG. 5 is an explanatory diagram of actuator operation. Explanation of symbols, 1...Case, 2, 3, 4, 5...
...Shift shaft, 2A, 3A, 4A, 5A...
Shift fork, 2a, 3a, 4a, 5a... engaging surface, 3B... fork, 6, 7... control shaft, 7a, 7b, 7c... check groove,
7d, 7e... Convex portion, 8, 9... Select lever, 10, 11... Piston rod, 12, 13
... Ball member, 14, 15 ... Select actuator, 16, 17 ... Engagement member, 16a,
17a... Groove, 18... Connecting member, 19... Hole,
19a... Ball for stopper, 19b... Elastic member, 20... Shift actuator, 21...
Piston rod, 22...Cylinder, 22a, 2
3a... Shoulder, 23, 24... Piston.

Claims (1)

[Scope of utility model registration request] a plurality of control shafts that select one shift shaft from a plurality of shift shafts; a single shift actuator that simultaneously shifts the plurality of control shafts by interconnecting the plurality of control shafts with a connecting member; One of multiple control shafts
1. A shift operation mechanism for a transmission, comprising a single positioning check mechanism provided between a control shaft and a case housing the control shaft.