JPH0830535B2 - Gear mechanism of gear type transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a speed change mechanism of a gear type transmission that switches a transmission by operating a change lever, and more particularly to a FR (front engine rear drive) vehicle transmission and a 4WD (4WD). (Wheel drive) The present invention relates to a transmission mechanism suitable for common use with a vehicle transmission.

(Prior Art) Generally, a transmission mechanism of a gear type transmission is fixed to a rod by selectively sliding one of a plurality of shift rods arranged in parallel by operating a change lever. One of the plurality of gear trains for shifting is brought into a power transmission state via the shifted fork and the synchronous meshing device engaged with the fork. When configuring a power transmission device for driving a wheel, a control rod is arranged between the change lever and the shift rod, as disclosed in Japanese Utility Model Laid-Open No. 59-125648. That is, in this case, the seventh
As shown in the figure, a transfer device C is connected to the rear of the transmission A via an extension housing B, and an operation lever D of the transfer device C and a change lever E of the transmission A are arranged close to each other. Necessary
These levers D and E are provided in the extension housing B. Therefore, change lever E
Will be located behind the transmission A, so that a control rod F connecting the lever E and a shift rod (not shown) in the transmission A is required.
Then, by interlocking with the horizontal select operation and the vertical shift operation of the change lever E, the control rod F is rotated and moved back and forth to select and slide one of the plurality of shift rods. Is configured as follows.

It should be noted that this control rod is not limited to the transmission for a 4WD vehicle, but is also required for a transmission for an FR vehicle when the lever and the change lever are arranged behind the transmission because of the layout of the transmission and the change lever. It is something.

(Problems to be Solved by the Invention) By the way, as described above, the change lever E is connected to the transmission A.
When the control rod F is interposed between the lever E and the shift rod in the transmission A because of the arrangement behind the control rod F, as shown in FIG. In this case, in order to support the rod F so that it can move back and forth, the extension housing B needs bearings B ′ and B ″ that support both ends of the rod F. As a result, there arises a problem that the axial dimension of the housing B, in other words, the axial dimension of the transmission or the four-wheel drive power transmission device as a whole becomes long.

Further, in the structure in which both ends of the control rod F are supported by the extension housing B as described above, vibration from the housing B or the transmission A side is transmitted to the control rod F and further transmitted to the change lever E. As a result, there arises a problem that the driver's car is uncomfortable.

Therefore, in the present invention, by adopting a link type rod as the control rod, it becomes unnecessary to support the rod in the extension housing, and the axial dimension of the housing is shortened or the housing is omitted. It is also possible to prevent the transmission from being transmitted to the change lever by absorbing and blocking the vibration from the transmission side by the link connecting portion.

In particular, in the present invention, by adding a device to the mechanism for transmitting the operation of the control rod to the shift rod, the transmission mechanism is provided with a change lever for an FR vehicle or the like. It is intended to be applied to a machine and to be able to configure a transmission for a 4WD vehicle or the like in which the lever is arranged rearward without requiring a great change.

(Means for Solving Problems) That is, in the transmission mechanism of the gear type transmission according to the present invention, the transmission is arranged such that its axis extends in the longitudinal direction of the vehicle body, and the change lever is arranged behind the transmission. In the configuration described above, the transmission and the change lever are connected via a link mechanism, and a plurality of shift rods that are arranged in parallel in the transmission and have engaging recesses adjacent to each other, respectively. A link lever is configured together with the change lever and the intermediate rod by connecting a rear end portion and a front end portion to an intermediate rod of the change lever, which is selectively engaged with the engaging recess of each shift rod. The control rod is fixed to the intermediate rod and is engaged with the selection lever, and the rotation in the direction opposite to the selection direction is interlocked with the selection operation of the change lever. It is composed of an intermediate lever that swings the selection lever a predetermined amount in the rolling direction. Of the shift rods arranged in parallel, the reverse speed shift rod is arranged on one side of the transmission and on the side opposite to the reverse speed select position of the change lever. In addition, the engaging recess of the shift rod is arranged on the other side of the engaging recess of the other shift rod across the other shift rod.

(Operation) According to the above configuration, the selection lever is swung by the control rod, the intermediate rod, and the intermediate lever by a predetermined amount by the lateral selection operation of the change lever, and the selection lever is provided on each shift rod. Will be engaged with any one of the engaging recesses. Therefore, if the change lever is shifted in the vertical direction in this state, the shift rod in which the selection lever is engaged with the engaging recess is shifted in the front-rear direction, and any one of the gear trains for shifting of the transmission is shifted. Is in a power transmission state.

In particular, according to the above configuration, the control rod for transmitting the operation of the rear change lever to the front transmission is connected to the change lever at the rear end and to the intermediate rod at the front end. The extension housing having a long axial dimension as in the case of supporting the control rod so as to be rotatable and movable back and forth is unnecessary.

By the way, when the control rod is connected to the change lever as described above, the amount of rotation of the control rod or the intermediate rod for a certain amount of select operation of the lever is reduced, but this rotation is transmitted to the selection lever via the intermediate lever. Since they are interlocked, by appropriately setting the lever ratio between both levers, the selection lever can be swung as much as necessary to surely engage with the engagement recesses of the plurality of shift rods.

Further, by interposing the intermediate lever, the swinging direction of the selection lever with respect to the predetermined select operation direction of the change lever is configured so that the lower end portion of the change lever is directly engaged with the engagement recesses of the plurality of shift rods. It will be in the opposite direction from FR vehicle transmissions. Therefore, this transmission mechanism
When constructing a transmission for a 4WD vehicle in which a change lever is arranged rearward for a FR vehicle transmission, it is necessary to change the arrangement of shift rods.

That is, in the case of a transmission in which the lower end of the change lever is directly engaged with the engaging recess of the shift rod, the select direction of the change lever and the swinging direction of the lower end are the same in the rotation direction. For example, the reverse speed shift rod is arranged on the side opposite to the reverse speed select position of the change lever in the transmission.
If a transmission mechanism having an intermediate lever as described above is used, the select operation direction of the change lever and the swinging direction of the select lever are opposite rotation directions. It must be located on the same side as the reverse speed select position of the change lever in the transmission.

Therefore, by applying this transmission mechanism to a transmission such as an FR vehicle in which the lower end of the change lever is directly joined to the engagement recess of the shift rod, the transmission for a 4WD vehicle in which the change lever is located rearward is changed. If you try to configure the machine,
It is necessary to change the arrangement of the shift rods. In particular, it is often difficult to change the positions of the reverse speed shift rods due to the positions of the gear trains and the meshing device.

On the other hand, in the speed change mechanism of the present invention, the engagement recess of the shift rod located on one side of the plurality of shift rods crosses the other shift rod to engage the other reverse speed shift rod. Since it is arranged on the other side of the fitting recess, even if the swing direction of the selection lever is the reverse rotation direction of the select operation of the change lever, it is necessary to change the position of the shift rod for reverse speed. Therefore, by applying the transmission mechanism to a transmission configured for an FR vehicle or the like, it is possible to configure a transmission for a 4WD vehicle or the like in which a change lever is located rearward.

(Example) Hereinafter, the Example of this invention is described.

First, the overall structure of the gear type transmission according to the present embodiment will be described with reference to FIG. 1. The gear type transmission 1 is a 4WD vehicle transmission and is arranged in the front-rear direction of the vehicle body to an engine output shaft (not shown). An input shaft 2 connected via a clutch,
The input shaft 2 has an output shaft 3 concentrically arranged behind the input shaft 2 and connected to a transfer device (not shown), and a counter shaft 4 arranged in parallel below the output shaft 3 and these are arranged in a mission case. It is rotatably supported in the unit 5.
The counter shaft 4 has an input gear 6 integrally provided at the front end thereof meshed with a drive gear 7 integrally provided at the rear end of the input shaft 2, so that the input shaft 2 It is designed to rotate in conjunction with the rotation.

Further, between the counter shaft 4 and the output shaft 3,
From the front, third gear train 13, second gear train 12, first gear train
An 11th and 5th speed (overdrive) gear train 15 and a reverse gear train 16 are provided. Of these gear trains,
The first to third speed gear trains 11, 12, and 13 are all integrally provided on the counter shaft 4, and are configured as a first speed first gear 11 ₁ , a second speed first gear 12 ₁ , and a third speed first gear. 13 ₁ and the first gear second gear 11 ₂ which is rotatably fitted to the output shaft 3 and meshed with the respective first gears 11 ₁ , 12 ₁ and 13 ₁ and the second gear second gear 12 ₂ It is composed of a third gear 13 ₂ for the third speed. In contrast, 5-speed gear train 15 includes a rotatably mated 5-speed first gear 15 ₁ for the counter shaft 4, splined to the shaft 3 to rotate integrally with the output shaft 3 And the second gear 15 ₂ for the fifth speed meshed with the first gear 15 ₁ . Further, the reverse gear train 16 includes a rotatably mated first gear 16 ₁ for reverse to the counter shaft 4, it is rotatably fitted with being meshed with ₁ the first gear 16 to the idle shaft 16a It comprises a reverse idle gear 16 ₃ and a second reverse gear 16 ₂ which is spline-fitted to the output shaft 3 and meshed with the idle gear 16 ₃ .

Then, the first gear second gear 11 ₂ on the output shaft 3
If between the second gear 12 ₂ for the second speed, selectively coupled to the shaft 3 rotatable these gears with respect to the output shaft 3
A first synchronizer 21 for 1st and 2nd speed is arranged, and a second gear 13 ₂ for 3rd speed, which is rotatable with respect to the output shaft 3, is connected to the front end of the output shaft 3. A second synchronizer 22 for the third and fourth speeds is provided which connects the input shaft 2 and the output shaft 3 directly. Further, between the first gear 15 ₁ for fifth speed and the first gear 16 ₁ for reverse on the counter shaft 4, those gears rotatable with respect to the counter shaft 4 are selectively selected.
There is a third synchronizer 23 coupled to the.

All of these synchronizers 21, 22, 23 have the same structure, and the clutch hubs 21a, 22a, 23a that rotate integrally with the output shaft 3 or the counter shaft 4 and slide back and forth on these hubs. Clutch hub sleeves 21b, 22b, 23b fitted with splines, and clutch gears 21c21d, 22c, 22 which are meshed with the sleeves when the sleeves slide.
It is composed of d, 23c, 23d, etc. Then, the first synchronization device 2
The first gear second gear 11 ₂ is connected to the output shaft 3 by sliding the 1st sleeve 21b to the rear, and the 2nd gear 2nd gear 12 ₂ is connected to the output shaft 3 by sliding the sleeve 21b to the front. The second gear 13 ₂ for the third speed is connected to the output shaft 3 by sliding the 22b to the rear, and the input shaft 2 and the output shaft 3 are directly connected to each other by sliding the sleeve 22b to the front. By sliding the sleeve 23b of the device 23 to the front, the fifth gear first gear 15 ₁ is connected to the counter shaft 4 by sliding it to the rear, and the reverse first gear 16 ₁ is connected to the counter shaft 4. As a result, the gear trains 11 to 16 are selectively brought into the power transmission state, and the gear ratio between the input shaft 2 or the counter shaft 4 and the output shaft 3 is switched to 5 forward gears and 1 reverse gear.

Next, the clutch hub sleeve of each of the synchronization devices 21 to 23
A configuration of the speed change mechanism 30 that selectively slides 21b to 23b to switch the speed is described.

The transmission mechanism 30 includes three shift rods 31, 32, 33 arranged in the front-rear direction via a holder 9 on a lower surface of a cover 8 which covers an upper surface of a case 5, and is a rearward portion of the transmission 1. The shift rods are configured to be selectively slid in the front-rear direction by operating the lever 34. The shift rods are on the front side in the drawing of FIG. 1 (the left side in the drawing of FIG. 3).
Therefore, a third shift rod 33 for reverse of the fifth speed, a first shift rod 31 for the first and second speeds, and a second shift rod 32 for the third and fourth speeds.
Are arranged in order. The first shift rod 31 has a clutch hub sleeve in the first synchronizer 21.
The first shift fork 35 fitted to the outer periphery of the 21b is fixed to the second shift rod 32, and the second shift fork 36 fitted to the outer periphery of the clutch hub sleeve 22b of the second synchronizer 22 is fixed to the second shift rod 32. Has been done. On the other hand, an engaging member 37 having a pair of engaging projections 37a, 37a is fixed to the rear end portion of the third shift rod 33, and as shown in FIG. Is provided with a reversing lever 39 which is swingable in a vertical plane via a fulcrum pin 38, and an upper end portion 39a of the lever 39 has a protrusion 37 of the engaging member 37.
It is engaged between a and 37a. The lower end 39b of the reversing lever 39 is supported on the support shaft 40 so as to be slidable back and forth, and the clutch hub sleeve 23b of the third synchronizer 23 is provided.
Is engaged with a third shift fork 41 fitted around the outer periphery of the.

On the other hand, between the change lever 34 and the first to third shift rods 31 to 33, as shown in FIGS. 1 and 4, a portion of the change lever 34 protruding downward from the spherical bearing portion 34a. A rear end of the control rod 42 is connected to the front end of the control rod 34b and extends forward. A control rod 42 is supported above the front of the cover 8 in the front-rear direction and connected to the front end of the control rod 42 through a universal joint 43. The intermediate rod 44, an intermediate lever 45 fixed to the rod 44 and extending laterally, and an auxiliary rod supported by the cover 8 in parallel with the intermediate rod 44.
46, and a tip portion 45a of the intermediate lever 45 in a recess 47a that is fixed to the rod 46 and extends downward and is formed on the side surface of the boss portion.
And a selection lever 47 into which is engaged. Further, as shown in FIG. 1 and FIGS.
The first to third engaging members 4 are provided with engaging recesses 48a, 49a, 50a at the front ends of the shift rods 31 to 33 so as to be adjacent to each other.
8,49,50 are fixed respectively. Then, the tip 47b of the selection lever 47 is swung, so that the engaging recesses 48a,
9a and 50a are selectively engaged.

However, among the above-mentioned engaging members 48, 49, 50, it is fixed to the third shift rod 33 arranged on the front side (the left side in the drawing of FIG. 5) in the drawings of FIGS. 1 and 6. The extended third engaging member 50 is laterally extended to the opposite side (right side) across the first and second shift rods 31 and 32, and the engaging concave portion 50a is formed at the front end of the extended portion. ing. Therefore, the engaging recesses are the engaging recesses 48a of the first shift rod 31 (first engaging member 48), the engaging recesses 49a of the second shift rod 32 (second engaging member 49), The three shift rods 33 (third engaging members 50) are arranged adjacent to each other in the order of the engaging recesses 50a.
Here, in this embodiment, the second engaging member 49 fixed to the second shift rod 32 is formed integrally with the second shift fork 36, and the first shift rod 31 located on the front side of the second shift fork 36 is also formed. Is the second engaging member 49 (second shift fork).
It penetrates through a hole 49b provided at the base of 36).

As shown in FIG. 1, the holder 9 is provided with positioning mechanisms 51, 52 and 53 for positioning the first to third shift rods 31 to 33 at the illustrated neutral position and at positions before and after the neutral position, respectively. And as shown in FIG. 3, the third shift fork
A positioning mechanism 54 for positioning the fork 41 with respect to the support shaft 40 at the neutral position and the positions before and after the same is provided on the support shaft 40.

 Next, the operation of the above embodiment will be described.

First, the change lever 34 is moved to the left position I shown in FIG.
If the select operation is performed on the control rod 42, the rear end portion of the control rod 42 connected to the lower end of the lever 34 is swung to the right (in the x direction), so that the intermediate rod 44 moves in the counterclockwise direction (in the rear view). Is rotated in the x'direction shown in FIG. 5,
The intermediate lever 45 fixed to the rod 44 is swung in the same direction by a predetermined amount. Therefore, the selection lever 47 in which the tip end 45a of the intermediate lever 45 is fitted into the recess 47a is rocked together with the auxiliary rod 46 in the clockwise direction (x ″ direction shown in FIG. 5) in rear view, and the lever 47 is moved. The tip 47b of the first shift rod 3
It will be engaged with the engaging recess 48a of the first engaging member 48 fixed to 1. If the change lever 34 is operated to shift forward in this state, the lower end of the lever 34 moves rearward, so that the control rod 42, the intermediate rod 44, the intermediate lever 45, the selection lever 47, etc. move backward. By moving, the tip 47b of the selection lever 47 slides the first shift rod 31 rearward via the first engaging member 48 engaged with the engaging recess 48a. As a result, the first shift fork
Clutch hub sleeve 21b of the first synchronizer 21 via 35
Is slid also rearward, and ₂ second gear 11 for the first speed which is located behind the synchronous device 21 is coupled to the output shaft 3, it is the first-speed gear train 11 and the power transmission state, the transmission 1 1 It becomes a speed state. Further, if the change lever 34 is operated to shift rearward while being selectively operated to the position I on the left side in FIG. 2, the control rod 42 or the first shift rod 31 will move forward, contrary to the above case. As a result, the first synchronization device 21
The second gear 12 ₂ is coupled to the output shaft 3 for second speed positioned in front of, the second-speed gear train 12 is placed in the power transmission state, the transmission 1 is the second speed state.

Similarly, in the state where the change lever 34 is selectively operated to the intermediate position II in FIG. 2 (the neutral position remains), the distal end portion 47b of the selection lever 47 is the second engaging member fixed to the second shift rod 32. The engagement concave portion 49a of 49 is engaged. When the change lever 34 is operated to shift forward or backward in this state, the control rod 42 or the second shift rod 32 is slid backward or forward, so that the third synchronizing device 22 is used for the third speed. 2nd gear 13
₂ is connected to the output shaft 3 so that the third speed gear train 13 is in the power transmission state, or the input shaft 2 and the output shaft 3 are directly connected, and the transmission 1 is in the third speed state or the fourth speed state.

Further, the change bar 34 is located on the right side position III shown in FIG.
When a select operation is performed to, the lower end of the lever 34 or the rear end of the control rod 42 swings to the left (y direction),
Along with this, the intermediate rod 44 and the intermediate lever 45 rotate in the clockwise direction (y ′ direction in FIG. 5) in rear view, and
The selection lever 47 swings counterclockwise (y ″ direction),
The tip portion 47b of the lever 47 is engaged with the engagement recess 50a of the third engagement member 50 fixed to the third shift rod 33. Then, if the change lever 34 is shifted forward in this state, the control rod 42 or the third shift rod 33 is moved rearward, and the upper end 39a is engaged with the engaging member 37 at the rear end of the rod 33. Combined reversing lever 39
Is swung clockwise in the drawing of FIG. As a result, the third shift fork 41 engaged with the lower end portion 39b of the lever 39 is slid forward, and the fifth gear first gear 15 ₁ is moved to the counter shaft via the third synchronizer 23 on the counter shaft 4. The gear train 15 for the fifth speed is brought into the power transmission state by being connected to the fourth gear, and the transmission 1 is brought into the fifth speed state. Also, change lever
If you shift 34 backward,
The second to third shift rods 33 are moved forward and the reversing lever 39 is swung counterclockwise in the drawing of FIG. 1, whereby the third shift fork 41 is slid rearward and reverse. The first gear 16 _{1 for operation} is connected to the counter shaft 4, the reverse gear train 16 is in the power transmission state, and the transmission 1 is in the reverse state.

In this manner, the first to fifth speeds and the reverse speed can be obtained by operating the change lever 34 in the same manner as in the conventional case. However, in the transmission 1, the operation of the change lever 34 arranged on the rear side is performed forward. The control rod 42 transmitting to the transmission 1 is connected at its rear end and front end to the change lever 34 and the intermediate rod 44, respectively, and constitutes a link mechanism together with them, so that the control rod 42 is moved back and forth and rotated. The extension housing having a long axial dimension as in the case of movably supporting it is unnecessary. Further, the swing from the transmission 1 side is absorbed and attenuated by the universal joint 43 connecting the intermediate rod 44 and the control rod 42 or the connecting portion between the control rod 42 and the change lever 34, and the lever 34 It is prevented from being transmitted.

By the way, according to the above configuration, when the rear end portion of the control rod 42 is swung in the x direction or the y direction by the select operation of the change lever 34, the rod 42 rotates only about its axis. Therefore, the intermediate rod 44 connected to the rod 42 also has a small rotation amount. Therefore, when the selection lever is attached to the intermediate rod, the swing stroke of the lever tip portion becomes insufficient. Therefore, in this transmission 1, an intermediate lever 45 is provided on the intermediate rod 44 having a small rotation amount,
The selection lever 47 on the auxiliary rod 46 is swung by 45, and as shown in FIG. 4, both levers 45, 47 are moved at a ratio of distances X, Y from the swing center of the engaging portion. (X / Y)
Is set large, the swing of the intermediate rod 44 or the intermediate lever 45 is amplified and transmitted to the auxiliary rod 46 or the selection lever 47. As a result, the selection lever tip portion 47b is swung by a required stroke, and the selective engagement operation of the lever tip portion 47b with respect to the engagement concave portions 48a to 50a of the first to third engagement members 48 to 50 is reliably performed. It will be.

Further, in the configuration in which the select operation of the change lever 34 is transmitted to the selection lever 47 via the intermediate lever 48 as described above, the direction of the select operation of the change lever 34 is once reversed by the spherical bearing portion 34a of the lever 34. After that, the engaging portion between the intermediate lever 45 and the selection lever 47 is reversed again. Therefore, compared to the case where a portion below the spherical bearing portion of the change lever is used as a selection lever to directly and selectively engage a plurality of engagement recesses as in a transmission for FR vehicles, the same gear shift is performed. The swinging direction of the selective engagement operation of the selection lever in response to the selection operation to the step is the reverse direction.
Therefore, if the transmission mechanism using the intermediate lever is directly applied to the transmission for FR vehicles and the like, the arrangement of the shift rods must be exchanged. However, as in the transmission 1 according to the present embodiment. A reverse lever is provided between the third shift rod 33 and the third shift fork 41 for the fifth speed and reverse.
In the configuration in which 39 is interposed, the third shift rod 33
The positions of can not be easily exchanged.

Therefore, in the speed change mechanism 30 according to the present invention, the third shift rod 33 is arranged on the most front side in the drawing of FIG. The fixed third engaging member 50 is extended across the first and second shift rods 31 and 32 to the opposite side, and an engaging recess 50a is provided in the extension, so that only the position of the recess 50a is reversed. It is configured to switch to the side. The arrangement positions of the first and second shift rods 31 and 32, whose arrangement positions can be exchanged only by changing the mounting positions of the shift forks, are exchanged. That is, in the speed change mechanism 30, the position of the third shift rod 33 is
While keeping the same position as in the case of FR vehicle transmission, each engaging recess
40a to 50a are arranged opposite to the case of the FR vehicle transmission. As a result, by applying the transmission mechanism 30 of the present invention based on a transmission for an FR vehicle or the like configured so that the change lever is directly provided on the transmission, the change lever can be changed without requiring a large change. A transmission for 4WD vehicles, etc., will be configured behind the transmission.

(Effects of the Invention) As described above, according to the speed change mechanism of the gear type transmission according to the present invention, in the case where the change lever is arranged rearward like the transmission for a 4WD vehicle, the operation of the change lever is performed forward. Since the link type rod is used as the control rod for transmitting to the transmission, the extension housing having a long axial dimension for supporting the rod is not required, and the power transmission including the transmission or the transmission and the transfer device is not necessary. The device can be made compact. Further, the vibration from the transmission side is absorbed and damped by the connecting portion of the control rod, so that the uncomfortable vibration of the change lever is prevented. In particular, if this transmission mechanism is used, a transmission configured for an FR vehicle or the like, in which the change lever is directly provided in the transmission, does not require a significant change, and the change lever is arranged behind the transmission. It is possible to configure a transmission for 4WD vehicles, etc.
The main part of the transmission can be shared between them.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention, FIG. 1 is an overall vertical side view of a gear transmission including a speed change mechanism, and FIG. 2 is a lower end of a change lever taken along line II-II in FIG. 3 is a rear view of the main part of the transmission taken along line III-III in FIG. 1, and FIG. 4 is a cross-sectional plan view of the main part of the transmission taken along line IV-IV in FIG. 5, FIG. 5 is a rear view of a longitudinal section of an essential part of the transmission mechanism taken along the line VV in FIG. 1, and FIG. 6 is a perspective view around a selection lever in the transmission mechanism. Further, FIG. 7 is a schematic side view of a conventional 4WD vehicle transmission. 1 ... transmission, 30 ... transmission mechanism, 31 to 33 ... shift rod (33 ... reverse speed shift rod), 34 ... change lever, 42 ... control rod, 44 ... intermediate rod,
45 …… Intermediate lever, 47 …… Selection lever, 48a ～ 50a …… Engagement recess.

Claims (1)

[Claims] 1. A link type speed change mechanism for connecting a gear type transmission arranged such that its axis extends in the front-rear direction of a vehicle body and a change lever arranged at the rear of the transmission. A plurality of shift rods that are arranged in parallel in the transmission and have respective engaging recesses adjacent to each other, a selection lever that is selectively engaged with the engaging recesses of each shift rod, and a rear end portion of the change lever. A control rod that is connected and has a front end portion connected to an intermediate rod to form a link mechanism, and a control rod that is fixed to the intermediate rod and is engaged with the selection lever, and is linked to the select operation of the change lever in the select direction. A reverse lever shift rod among the shift rods is located on one side of the transmission. Is located laterally on the side opposite to the reverse speed select position of the change lever, and the engaging recess of this shift rod traverses another shift rod and the other engaging recess of the other shift rod. A gear shift mechanism for a gear type transmission, which is arranged laterally.