JPS59202524A - Shift mechanism of transmission - Google Patents

Abstract

PURPOSE:To attain a compact shift mechanism of a transmission by attaching a shift shaft and a shift head so that they can move in body only in a fixed range. CONSTITUTION:When a shift lever 75 is set at a neutral position, a shift head 51, a counter rod 53 and a counter lever 55 are unified so that they can have no link action. When the lever 75 is set at position D, only a shift head 50 moves to the left side. Thus a reverse driven gear moves left via a shift fork and engages a forward driven gear. When the lever 75 is set at position R, only the head 50 moves right. Then the reverse driven gear moves via the shift fork and engages a reverse intermediate gear. When the lever 75 is set at position P, the heads 51 and 50 move right and left respectively. Thus the reverse driven gear engages a parking gear.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shift mechanism for a transmission of a vehicle such as an automobile, which sets respective shift positions such as a forward position, a reverse position, a neutral position, and a parking position in a linear arrangement.

Recently, a heald drive type has been developed as a new continuously variable transmission for use in vehicles such as automobiles. This continuously variable transmission generally only changes the gear ratio steplessly in one direction of drive rotation, so in order to use it for a vehicle, it is necessary to reverse the drive rotation to obtain reverse drive. A sub-transmission is provided attached to the continuously variable transmission in order to perform gear changes between reverse drive and forward drive.

Note that this sub-transmission is often provided with a parking mechanism in addition to forward drive and reverse drive.

The first example of a power train including such an auxiliary transmission is
As shown in the figure. The sub-transmission shown in FIG. 1 is also shown as an example of a transmission to which the shift mechanism according to the present invention is applied.

To explain FIG. 1, 10 is a power source, 11 is a clutch, 12 is a main transmission, 13 is an auxiliary transmission, 14 is a final reduction gear and a differential, and the power source 10 is composed of an internal combustion engine. The clutch 11 then connects and disconnects power transmission from the power source IO. The main transmission 12 is configured as a heald drive type continuously variable transmission, and the auxiliary transmission 13 switches the drive rotation from the main transmission 12 into forward rotation, reverse rotation, etc. and transmits it to the final reduction gear and differential 14. introduce.

FIG. 2 shows a specific structure of the sub-transmission 13 shown in the skeleton diagram in FIG. 1. To explain this diagram, the input shaft 22, output shaft 23, intermediate shaft 24, parking shaft 2
The four axes of 5 are arranged in parallel. The input shaft 22 is rotatably supported by the transmission case 21 by left and right bearings 26 and 27, and the forward drive gear 2 is connected to the input shaft 22.
8 and a reverse drive gear 29 are integrally attached by spline connection or the like.

The output shaft 23 is also rotatably supported by the transmission case 21 by left and right bearings 30, 31, and the output shaft 23 has a forward driven gear 32 that constantly meshes with the forward drive gear 28 provided on the input shaft 22. is rotatably attached via a needle hair ring 33. Further, a hub 34 having a spline cut on the outer periphery is integrally attached to the output shaft 23, and a reverse driven gear 35 is spline-fitted to the outer periphery of the hub 34 so that it can slide in the axial direction. installed on. The forward driven gear 32 is integrally formed with spline teeth 32a, and the backward driven gear 32 is integrally formed with spline teeth 32a.
5 moves to the left in the drawing, the internal splines of the reverse driven gear 35 are brought into mesh with each other. Note that the output shaft 23
A gear 19 integrally formed at the right end of the figure represents a drive gear for the final reduction gear 14.

The intermediate shaft 24 is positioned and attached to the transmission case 21 by a mounting piece 36, and a reverse intermediate gear 37 is rotatably attached to the intermediate shaft 24. In addition,
The reverse intermediate gear 37 is always in mesh with the reverse drive gear 29 provided on the input shaft 22, and is mounted and positioned in the axial direction by snap rings 38, 39 at this position. This reverse intermediate gear 37 is connected to the output shaft 2.
By moving the reverse driven gear 35 to the right in the figure, the rear driven gear 35 meshes with this reverse driven gear 35.

The left and right ends of the parking shaft 25 are connected to the transmission case 21
It is integrally attached by spline fitting etc.
This parking shaft 25 has a parking gear 40.
are spline-fitted so that they are integral in the rotational direction but are movable in the axial direction. The parking gear 40 is moved to the right in the figure to be brought into alignment with the reverse driven gear 35, and the engagement between the reverse driven gear 35 and the parking gear 40 fixes the output shaft 23 to the transmission case 21. state.

Each operating state of the sub-transmission 13 based on the above configuration will be explained below.

In neutral state (state in FIGS. 1 and 2) When the reverse driven gear 35 is not meshed with any gear, the forward driven gear 32 is rotated by the forward drive gear 28. It is simply idling, no power is transmitted to the output shaft 23, and it is in a neutral state.

When moving forward (state in Figure 3), move the reverse driven gear 35 to the left on the hub 34,
By meshing the internal spline of the reverse driven gear 35 with the spline teeth 32a of the forward driven gear 32,
A forward drive shift state is achieved. As a result, the forward driven gear 32 and the hub 34 are power-coupled via the reverse driven gear 35, and rotational power is transmitted to the output shaft 23.

The power transmission path during this forward movement is as follows.

Input shaft 22 - Forward drive gear 28 - Forward driven gear 32
→ Spline tooth 32a - Backward driven gear 35 → Hub 34
→Output shaft 23 The rotation of the output shaft 23 is caused by a gear 19 integrally attached to the output shaft 23, which is connected to the final reducer and the differential tffl14.
Power is transmitted to.

When reversing (state in FIG. 4), move the reverse driven gear 35 to the right above the hub 34, and mesh the reverse driven gear 35 with the reverse intermediate gear 37 provided on the intermediate shaft 24. Thus, a reverse drive shift state is achieved. As a result, the reverse drive gear 29 of the input shaft 22 and the reverse driven gear 35 on the output shaft 23 are in mesh with each other via the reverse intermediate gear 37, and the input shaft 22
The rotational power of is transmitted to the output shaft 23. The power transmission path during this backward movement is as follows.

Input f-axis 22 - Reverse drive gear 29 - Reverse intermediate gear 37
- Backward driven gear 35 - Hub 34 - Output shaft 23.

When parking (state in Fig. 5), the reverse driven gear 35 is moved leftward from the right end surface position in the reverse drive shift state described above to the left end surface position of the hub 34, and meshes with the reverse intermediate gear 37. The parking state is achieved by moving the parking gear 40 to the right in the figure and meshing with the reverse driven gear 35. That is, the parking gear 40 is integrally attached to the parking shaft 25 in the rotational direction by spline fitting or the like, and this parking shaft 25 is also integrally fixed to the transmission case 21 by spline fitting or the like. Since the reverse driven gear 35 and the parking gear 40 mesh with each other, the output shaft 2
3 is fixed to the transmission case 21 and achieves the parking state. The fixing route of the output shaft 53 to the transmission case 51 during parking is as follows.

Output shaft 23 - hub 34 - reverse driven gear 35 - parking gear 40 -> parking shaft 25 -> transmission case 21 The above-mentioned sub-transmission 13 includes two gears: reverse driven gear 35 and parking gear 40. By axial movement in a predetermined direction, the above-mentioned neutral (N) state, forward drive (D) state,
Each of the speed change states of the reverse drive (R) state and the parking (P) state is achieved, and the movement of the shift operation to each speed change state involves shifting the reverse driven gear 35 to the D state and the R state. There are two ways: movement and movement of the parking gear 40 to the P state. Therefore, according to the conventional conventional method of configuring the shift mechanism, in such a case, it was necessary to configure the shift trench array on two sides.

However, it is desired that the shift mechanism for shifting to each of the first and second P, R, N, and D shift states be constructed as compactly as possible. Having two shift operation rows increases the size and complexity of the shift mechanism, so it is desirable to set each shift position on the shift lever in a linear arrangement, similar to conventional general-purpose automatic transmissions. .

The axial movement operation of the reverse driven gear 35 and the parking gear 40, which change the speed change state, is performed using the shift fork grooves 35a, 40a integrally provided on each gear 35, 40, as shown in FIG. This is performed by shift 1 to fork 41 and 42 fitted into the shifter.

The present invention has been made to meet the above-mentioned requirements, and includes a shift shaft that moves in the axial direction when a shift lever is operated, and a shift I/head of a shift fork that performs the switching action of a speed change gear. It is an object of the present invention to provide a compact shift mechanism by making it possible to linearly arrange shift positions by mounting the shift mechanism so as to move integrally only within a certain range.

The structure of the shift mechanism of the transmission of the present invention that achieves this object includes two shift heads connected to a shift fork for switching and operating the shift states of a plurality of shift gears.
These two shift heads are supported by a shift rod and a counter rod arranged in parallel so that they can slide in the axial direction, and the shift rod and counter rod are attached to the transmission case in the axial direction. Each of the shift heads is provided with an interlock bin that selectively engages with a groove provided in each of the shift rod and counter rod, and an interlock bin is provided between the two shift heads. is characterized in that a locking member such as a snap ring is attached to the shift rod and the counter rod, respectively, and a single shift head and the counter rod are connected by a counter lever that reverses the direction of movement and transmits the transmission. shall be.

Next, based on the above configuration of the present invention, an embodiment will be described based on the drawings.

FIG. 6 shows an embodiment of the shift 11 mechanism applied to the sub-transmission having the detailed structure shown in FIG. Therefore, the description of FIG. 6 will be explained in conjunction with FIG. 2.

In FIG. 6, 50 and 51 are shift heads, 52 is a shift rod, and 53 is a counter rod, and the shift head 50 is fitted into the shift fork fitting groove 35a of the reverse driven gear 35 shown in FIG. The shift head 51 is integrally connected to the shift fork 41, and the shift head 51 fits into the shift fork fitting groove 40 of the parking gear 40 shown in FIG.
It is integrally connected to the shift fork 42 fitted into the section a. This two (hard shift head 50, 51) consists of a shift rod 52 and a counter rod 53 arranged in parallel.
Supported by the book Rondo. Specifically, a shift rod 52 and a counter rod 53 are fitted through and supported by two shift heads 50 and 51 so as to be slidable in the axial direction.

The shift rod 52 is attached to the transmission case 21 so as to be movable in the axial direction, and is linked to a shift lever 75 installed in the driver's cab via an appropriate link member. In FIG. 6, for convenience, a shift head 57 is integrally connected to the shift rod 52 by a pin 56 or the like.
It is shown as being directly interconnected. Of course, if possible, the shift rod 52 and the shift lever 75 may be directly connected in the specific configuration.

The counter rod 53 is also attached to the transmission case 21 so as to be movable in the axial direction. However, counter rod 5
A snap ring 58 is attached to the right position of No. 3, and is attached so as to come into contact with the wall surface of the transmission case 21 on the right side in the neutral position, so that the counter rod 53 cannot be moved to the right. Regulated. Note that although the snap ring 58 is not necessarily required, it is possible to perform a more reliable shifting operation by providing the snap ring 58.

The shift head 50.51 has pin mounting holes 63.
64, and interlock pins 65, 66 are fitted into these pin mounting holes 63, 64. The ink lock pins 65 and 66 are fitted into pin mounting holes 63 and 64 between the shift rod 52 and the counter rod 53, and when the shift rod 52 is in the retracted position (the state in FIG. 8), Concave grooves 67, 68, 69, and 70 are provided at the positions of the shift rod 52 and counter rod 53 at both ends of the .66, respectively. Further, snap rings 71 and 72 as locking members are fitted between the shift heads 50 and 51 and fitted into respective mounting grooves 73 and 74 of the shift throat 52 and the counter rod 53.

As shown in FIG. 6, the counter head 54 is integrally attached to the counter rod 53 by a pin 59 or the like, and the counter head 54 and the shift head 51 are connected to a counter lever 55 which reverses the direction of movement and transmits the transmission. are connected by. The details of this connection structure are as shown in FIG. 7. The counter lever 55 is rotatably attached to the pin 21a of the transmission case 21, and is prevented from being pulled out in the axial direction by a snap ring 60 or the like. One end 55a of the counter lever 55 is connected to a pin portion 51a integrally provided to the shift head 51, and the other end 55a is connected to a pin portion 51a integrally provided to the shift head 51.
5b is rotatably attached to the bottle portion 54a integrally provided to the counter head 54 described above, and is stopped by locking tools such as snap rings 6e and 62 to prevent removal in the axial direction. .

The operation of the shift mechanism constructed as described above at each shift position will be explained next.

Neutral position (state in Fig. 6) When the shift lever 75 is in the neutral (N) position, the interlock pin 66 of the shift knob 50 engages with the groove 68 provided in the shift rod 52, as shown in Fig. 6. The shift head 50 and the shift roller 52 are engaged with each other, and the shift head 50 and the counter I tip 53 are in a slidable state. On the other hand, the interlock pin 65 of the shift head 51 engages with a groove 70 provided in the counter rod 53, so that the shift head 51 and the counter rod 53 are integrated. In addition, since the counter lever 55 is connected via the reversing mechanism, the shift head 51
, the counter rod 53, and the counter lever 55 are in an integral state in which the link cannot be operated, and the link connecting members 51, 53, and 55 in the integral state are as follows:
The counter lever 55 is positioned in the axial direction by the pin 21a that supports the transmission case 21. Therefore, the shift head 51 and the counter rod 53 are fixed to the transmission case 21. Further, the movement of the counter rod 53 in the right direction is also restricted by a snap ring 58 attached to the right side thereof. Furthermore, the shift head 51 is fixed by the snap ring 72.
movement to the left is restricted. In addition, shift head 5
1 and the shift rod 52 are in a slidable state.

When the shift lever 75 is moved from the N position to the forward drive (D) position, the shift head 50 is moved by the shift rod 52.
is pushed by a snap ring 71 attached to the
It is moved to the left while remaining in the engaged state of the N state described above. That is, the shift rod 50 and the counter rod 53 are slidable, and the ink lock pin (36 is the shift rod 5
The shift head 50 and the shift rod 52 are moved leftward while being engaged with the concave groove 68 of No. 2 and maintaining the integrated state.

On the other hand, the shift head 51 continues to maintain the N position described above. That is, the shift head 5
1 and the counter rod 53 are fixed to the transmission case 21.

As a result, when the shift lever 75 is in the D position, only the shift head 50 moves to the left, and therefore the reverse driven gear 35 moves to the left via the shift fork 41 that is integrated with the shift head 50. Reverse driven gear 35
meshes with the spline teeth 322 of the forward driven gear 32,
Achieve a forward drive shifting state.

Therefore, when operating the shift knee lever 75 from the first position R to the N position, the shift head 50 is integrated with the shift rod 52 by the interlock pin 66, so the shift head 50 is integrated with the shift rod 52. and move to the right.

At this time, since the other shift head 51 is fixed to the transmission case 21, it maintains the same position.

Reverse position (FIG. 9 state) When moving the shift lever 75 from the N position to the reverse (R) position, the shift head 50 is moved to the interlock pin 66.
Since the shift head 50 is integral with the shift rod 52, the shift head 50 moves rightward integrally with the shift lower 52, and the ink lock pin 66 of the shift head 50 is connected to the shift rod 52 and the counter rod 53. Concave groove 6
8. It becomes a state where it does not engage with either of 69. On the other hand, the position of another shift head 51 is the same as in the above-mentioned N position and D position state, but this shift head 51
The ink lock pin 65 of the ink lock pin 65 is formed by moving the shift rod 52 in the right direction so that the groove 67 provided in the shift rod 52 comes to the position of the interlock pin 65. It is in a state where it does not engage with either of them.

As a result, when the shift lever 75 is in the R position, only the shift head 5o moves to the right, and therefore, the reverse driven gear 35 moves to the right via the shift fork 41 that is integrally connected to the shift head 5o. , the reverse driven gear 35 meshes with the reverse intermediate gear 37, and a reverse gear shift state is achieved.

When operating the shift lever 75 from the R position to the N position, the shift head 5o is pushed by the snap ring 71 attached to the shift rod 52 and moves to the left. The interlock pin 66 is inserted into the groove 6 provided in the shift rod 52.
8 to move the shift head 50 and shift rod 52 as one unit to the left. On the other hand, in another shift head 51, as the shift rod 52 moves leftward, the ink lock pin 65 engages with the groove 70 of the counter rod 53, and the shift head 51 and the counter rod 53 become integrated. As described above, the shift head 51 is fixed to the transmission case 21 and maintains the same position.

Parking position (state in Fig. 10) When moving the shift lever 75 from the R position shown in Fig. 9 to the parking (P) position, the shift head 51
It is pushed by a snap ring 71 attached to the shift rod 52 and moves to the right. As a result, the shift fork 42 connected to the shift head 51 also moves to the right. At this time, the interlock pin 65 provided on the shift head 51 engages with the groove 67 provided on the shift rod 52, so that the shift head 51 and the shift rod 2 door 5 are engaged with each other.
2 is integral.

On the other hand, as the shift drawer throat 52D moves in the right direction, the shift head 50 shifts to shift.The ink lock pin 66 provided on the throat 50 engages with the groove 69 provided in the counter opening throat 53, and the shift head 50 shifts to shift. The throat 50 and the counter rod 53 are integrated.

Note that since the counter rod 53 is connected to the shift throat 51 by a counter lever 55 that reverses the direction of movement and transmits the transmission, the above-mentioned rightward movement of the shift rod 52 causes the leftward movement of the shift rod 52 to the counter mouth 53. It is transmitted as a directional movement, which causes the shift throat 50 to move to the left.

As a result, when the shift lever 75 is in the P position, the shift head 51 moves to the right, and the shift head 51 moves to the right.
．． 1, the parking gear 40 is moved to the right, and the shift throat 50 is moved to the left through the shift fork 42, which is integrally connected to the shift throat 50. The reverse driven gear 35 is moved to the left via the shifted shift fork 41, and the reverse driven gear 35 is disengaged from the reverse intermediate gear 37, and the parking gear 40 and reverse driven gear 35 are engaged. Achieve a parking condition.

Note that when operating the shift lever 75 from the P position to the R position, the shift head 51 is moved from the ink lock pin 65.
Since the shift head 50 is integral with the shift rod 52, the shift head 50 moves leftward integrally with the shift rod 52. Further, since the shift head 50 is also integrated with the counter rod 53 by the ink lock bin 66, it is moved to the right via the counter lever 55 and the counter rod 53 as the shift throat 51 moves to the left. The R position state shown in FIG. 9 is reached.

As described in detail above, the shift mechanism of the present invention includes two shift heads 50.5 for operating a plurality of transmission gears.
1 to the shift rod 52, interlock, cupin 6
5.66, by configuring this shift head 50.51 to move integrally with the shift rod 52 only in a certain different range by the counter lever 55, counter rod 53, etc., the axial direction of one shift rod 52 It is now possible to set all shift positions just by moving.
Each shift position such as P, R2H, D, etc. can be set in a linear arrangement on the shift lever 75 connected thereto, and a preferable shift pattern for the transmission can be achieved.

Further, in the present invention, the shift mechanism can be configured by a simple link mechanism that only provides axial movement to the shift rod 52 fitted to the shift head 50, 51, so the entire mechanism can be made compact. I can do it.

Furthermore, since the shift pattern of the shift lever 75 is a linear arrangement, the driver can perform gear shifting operations extremely easily.

[Brief explanation of drawings]

FIG. 1 is a skeleton diagram of a power train including a sub-transmission to which the shift mechanism of the present invention is applied, FIG. 2 is a vertical cross-sectional front view showing the specific structure of the sub-transmission shown in FIG. 1, and FIG. Figures 5 to 5 show skeleton diagrams of each operating state of the auxiliary transmission, Figure 3 shows the state when moving forward, Figure 4 shows the state when reversing, and Figure 5 shows the state when parking. 6 is a cross-sectional plan view showing one embodiment of the shift mechanism according to the present invention, FIG. 7 is a sectional view taken along the line ■-■ in FIG. 6, and FIG.
10 to 10 show the operating states of the shift mechanism, with FIG. 8 showing the forward position state, FIG. 9 showing the backward position state, and FIG. 10 showing the parking position state. Explanation of symbols 21--Transmission case 35--Reverse driven gear (speed change gear) 4 (1--
Parking gear (shift gear) 41.42 ---- Shift fork 50.5 m ---- Shift head 52 - Shift rond 53 - Counter rod 65.6 Low - Ink lock pin 67 to 70 One concave groove 71.72---Snap ring (locking member) 75---
---Shift lever- Applicant Toyota Motor Corporation! N test company

Claims (1)

[Claims] (]), a shift fork (/11
) (42) and shift heads (50) (51) connected to
2 (flit) and these two shift heads (50)
(51) is slidably supported in the axial direction by a shift rod (52) and a counter rod (53) arranged in parallel, and the shift rod (52) and counter rod (53) are It is attached to the transmission case (21) so as to be movable in the axial direction, and each of the shifts 1 to the head (50)
(51) has grooves (67) to (7) provided in each of the shift rod (52) and the counter rod (53).
0) selectively engages with the ink lock pin (65) (6
6), and a locking part such as a snap ring is provided between these two shift beds (50) and (51).
; t(71) and (72) are respectively attached to the shift rod (52) and the counter rod (53), and one shift head (51), one counter rod (53) and 9
Callan lever (55) that reverses the direction of movement and transmits the message.
A shift mechanism for a transmission characterized by being connected by.