JPS62224760A - Speed change operation mechanism of transmission - Google Patents

Abstract

PURPOSE:To simplify structure and reduce the dimension of the device by turning and engaging a selecting member with a link member at a specific position and carrying out the prescribed speed change operation by shifting the both members in the shift direction. CONSTITUTION:When an engaging shaft 15 is turned by the transfer of a driving member, and an engaging projection 14 and an engaging groove 19b are engaged, the 3rd-4th speed is selected, and when a selecting rod 11 is retreated by lin the Y-direction, and the projection 14 is turned counterclockwise by an angle theta, the projection 14 is engaged with an engaging groove 18a, and the shift operation to the 5th-6th speed is permitted by transferring a shift rod 9 in the X- direction. When the rod 11 is advanced by +l in the Y-direction, and the projection 14 is turned clockwise by +theta, the projection 14 is engaged with an engaging groove 20a, and the shift operation of the 1st-2nd speed is permitted by transferring the rod 9 in the X-direction. Further, when the projection 14 is turned clockwise by 2theta by advancing the rod 11 by +2l in the Y-direction, the projection 14 is engaged with a groove 22b by the turn of a selecting member 13, and a link member 22 is turned, and the retreat shift is completed by the transfer of a shift fork 8 in the X-direction.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a shift operation mechanism for a transmission that selects and shifts a shift fork provided in a transmission of an automobile or the like.

(Prior Art) Conventionally, this type of shift operation mechanism has a specific shift fork attached to a specific support rod so as to be movable in the shift direction.
A gear shift operation is performed by moving a specific shift fork in the axial direction of the support rod, that is, in the shift direction, while being engaged by a driving means of a so-called select mechanism.

(Problem to be Solved by the Invention) However, in the shift operation mechanism of such a conventional transmission, in order to select and operate a plurality of shift forks, which increase with the increase in the number of gears, it is necessary to individually operate the shift forks. The number of select mechanisms that control the shift forks has also increased, making the system larger and the overall structure more complex.

(Means for solving the problems) The present invention was made in view of the above problems, and
In a shift operation mechanism of a transmission that performs a shift fork selection and shift operation, a switching means is provided to be movable in a selection direction and a shift direction, and the switching means is engaged with the switching means to move the switching means in the selection direction. a driving means;
a link means that is engaged when the switching means is moved to a specific position in the select direction and rotates in the shift direction when the switching means is moved in the shift direction; The technical point is that the device is provided with a connecting means that moves in the shift direction.

(Example) Fig. 1 is a plan view of the essential parts showing one embodiment of the shift operation mechanism of a transmission according to the present invention, Fig. 2 is a side view of Fig. 1 showing the main parts from the direction of arrow B, and Fig. 3 The figure is a sectional view taken along the line AA in FIG. 1, and the following description will be made based on these drawings.

First, to explain the configuration, 1 is a support rod to which a shift fork 2 for switching between 5 and 6 speeds is fixed, 3 is a support rod to which a shift fork 4 for switching between 3 and 4 speeds is fixed, and 5 is a support rod for switching between 1 and 2 speeds. 7 is a support rod to which a shift fork 6 for reverse switching is fixed, and 7 is a support rod to which a shift fork 8 for reverse switching is fixed, and all the support rods 1, 3, 5. The casing is mounted so that it can slide in the axial direction.

A shift rod 9 is connected to the drive shaft of the shift cylinder 10, and is provided to move forward and backward in the shift direction (direction of arrow X) when the shift cylinder 10 is driven.

In addition, as shown in FIGS. 2 and 3, the shift rod 9
are provided in parallel and oppositely to each of the support rods 1, 3, 5.7.

Reference numeral 11 denotes a select rod connected to the drive shaft of the select cylinder 12, and is provided to move forward and backward in the select direction (direction of arrow Y) substantially perpendicular to the axial direction of the shift rod 9 when the select cylinder 12 is driven. ing. Incidentally, the select cylinder 12 uses a multi-stage switchable cylinder device that can move the select rod 11 forward and backward to four different positions in the select direction.

A switching member 13 is provided on one side of the shift rod 9 and is attached so as to be rotatable in the circumferential direction and move integrally with the shift rod 9 in the shift direction. As shown in FIGS. 2 and 3, the support rod 1
, 3, 5.7 side, and an engagement shaft 15 extending in the shift direction are fixed, and the engagement fI 115 is connected to the engagement groove 17 of the drive member 16 fixed to the select rod 11.
It is fitted in so that it can move freely. Therefore, as the select rod 11 moves forward and backward in the selection direction, the drive member 16 similarly moves, and the engagement shaft 15 is rotated about the shift rod 9, thereby causing the engagement protrusion 14 and the switching member 13 to rotate. also rotates in the same direction.

As shown in FIGS. 1-3, support rods 1.3.
5 includes link members 18 and 19 extending toward the engaging projection 14 side.
．． 20 are fixed, and each distal end portion has an engagement groove 18a that engages at a predetermined position as the engagement protrusion 14 rotates.
19a and 20a are formed. In addition, the link member 19
is formed integrally with the shift fork 4.

A link member 21 extending slightly away from the engagement protrusion 14 is fixed to the support rod 7, and an engagement groove 218 is formed at the tip thereof, into which a link member 22, which will be described later, is engaged.

In FIG. 1, a link member 22 formed in a substantially U-shape
are poles 1 to 1 disposed approximately at right angles to the support rod 7.
An engagement protrusion 22a formed at one end of the link member 22 engages with an engagement groove 2'la of the link member 21, and an engagement protrusion 22a formed at one end of the link member 21 engages with the engagement groove 2'la of the link member 21. is an engagement groove 22b in which the engagement protrusion 14 can engage.
is formed. Therefore, when the shift rod 9 is moved in the shift direction 22a and the engagement groove 21a to move the shifter 1 to the fork 8 in the shift direction X.

Next, the operation of the transmission mechanism having such a configuration will be explained.

First, as shown in Fig. 1, all link members '18,
19, 20.21.22 engagement groove 18a.

When 19a, 20a, 21a, and 22a are in the same position as the engaging protrusion 14 in the shift direction, it is in a neutral state, and the selection operation described below is always performed through this state.

In FIG. 3, when the engagement lN 115 is rotated by the movement of the drive member 16 (not shown) and the engagement protrusion 14 and the engagement groove 19a are engaged, the 3rd and 4th gears are selected 1-, and the shift cylinder 10 By driving the shift rod 9 in the predetermined shift direction X, either speed can be switched.

Next, based on the state shown in FIG. 3, select rod 11
When the engaging protrusion 14 is rotated counterclockwise by an angle θ by retreating a distance of 1 in the selection direction Y, the engaging protrusion 14 engages with the engaging groove 18a, and in this state, the shift rod 9 in the predetermined shift direction X, a 5th-6th speed shift operation can be performed.

Next, in the state shown in FIG. 3, when the selection rod 11 is advanced by a distance of 10 m in the selection direction Y and the engagement protrusion 14 is rotated clockwise by an angle of +θ, the engagement protrusion 14 is engaged. By engaging with the matching groove 20a and moving the shift rod 9 in the predetermined shift direction X in this state, a 1st-2nd speed shift operation can be performed.

Next, in the state shown in FIG. 3, by moving the select rod 11 forward in the selection direction Y by a distance of +2·stop, the engaging protrusion 14 is rotated clockwise by an angle of +2·θ, as shown in FIG. As shown in FIG. 5, the switching member 13 is rotated by the engagement shaft 15 that engages with the drive member 16, and the engagement protrusion 14 engages with the engagement groove 22b of the link member 22 as shown in FIG.

In this engaged state, the switching member 1 is moved by the shift cylinder 10.
3 in the shift direction X, the link member 22 rotates, and the shift fork 8 is moved in the shift direction X together with the link member 21 that engages with the engagement protrusion 22a, completing the backward shift operation.

According to this embodiment, the switching member 13 is rotated to a plurality of predetermined positions, link members 18 to 21 are provided that engage at specific rotational positions, and the link members that are engaged with the switching member 13 move in the shift direction. Since a predetermined speed change operation can be performed by moving the gear, the structure is extremely simple and the device can be made smaller.

Further, by providing the link member 22, the shift operation mechanism can be realized even if the number of support rods arranged in parallel in the select direction increases as the number of shift stages increases.

Although this embodiment has a configuration in which the switching member 13 is rotated, the present invention is not limited to this, but the configuration is such that the switching member is moved linearly in the selection direction by the driving member 16 that moves in parallel to the selection direction. The linear movement causes the engagement protrusion 14 to move into the engagement groove 18 of the link member 18.19.20.22.
a, 19a.

20a, 22b may be engaged. In this case as well, it is necessary to configure the switching member 13 to move together with the shift rod 9 in the shift direction.

In this case as well, the structure is simple and the device can be made smaller.

(Effects of the Invention) As explained above, according to the present invention, there is provided a switching means movable in the select direction and a shift direction, and a drive that engages with the switching means and moves the switching means in the select direction. means, a link means that engages when the switching means is moved to a specific position in the select direction, and rotates in the shift direction when the switching means moves in the shift direction; Since it is provided with a connecting means that moves in the shift direction by rotation, the structure is extremely simple and the device can be made smaller.

[Brief explanation of drawings]

FIG. 1 is a plan view of the essential parts showing an embodiment of the shift operation mechanism of a transmission according to the present invention, FIG. 2 is a side view of the essential parts taken from the direction of arrow B in FIG. 1, and FIG. 3 is the same as in FIG. A A I! 4 is a plan view of essential parts shown for explaining the operating characteristics of FIG. 1, and FIG. 5 is a sectional view taken along the line CC in FIG. 4. 'I, 3.5, 7: Support rod 2.4.6, 8: Shift fork 9: Shift rod 10: Shift cylinder 11: Select 1 to lot 12: Select cylinder 13: Switching member 14: Engaging protrusion 15: Engagement shaft 16: Drive member 17: Engagement groove '18, 19, 20.2'l: Link member 22: Link member 22a: Engagement protrusion 18a, 19a, 20a, 2'la, 22b: Engagement groove

Claims (1)

[Scope of Claims] A shift operation mechanism for a transmission that selects and shifts a shift fork, comprising: a switching means movable in a select direction and a shift direction; and a switching means engaged with the switching means. a drive means for moving the switch in the select direction; a link means that engages when the switching means is moved to a specific position in the select direction and rotates in the shift direction when the switching means moves in the shift direction; and a link means integrated with the shift fork. 1. A speed change operation mechanism for a transmission, comprising: a connection means connected to the link member and moved in the shift direction by rotation of the link member.