JP2002144907A - Gearshift operating device for rough terrain vehicles - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In a shift operation device for an uneven terrain vehicle, a shift operation force transmission mechanism from a shift operation lever to a shift fork is simplified and made compact, and a space around a rider's foot is reduced. It is to secure. SOLUTION: The gear type speed change mechanism is a speed change operation device for an uneven terrain vehicle in which at least forward high speed, forward low speed, neutral and reverse can be switched by a single shift fork. A shift operation lever 15 that extends upward at a position above the engine and below the vicinity of one of the left and right sides of the steering handle 4.
And one change lever shaft 21 interlockingly connected to the shift fork is provided at the rear end of the engine 12 on the same side as the shift operation lever arrangement side in an upwardly projecting shape, and the shift lever shaft 21 and the shift The lever 15 is operatively connected to the lever 15 via a single connecting rod 20 along the side of the engine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift operation device for an uneven terrain vehicle equipped with a continuously variable transmission mechanism such as a belt converter and a gear type transmission mechanism from a power upstream side.

[0002]

2. Description of the Related Art In this kind of uneven terrain vehicle, a gear type transmission mechanism provided together with a continuously variable transmission mechanism usually has a high forward speed,
It is configured to be switched to forward low speed, neutral, reverse, set to forward high speed during normal running, and to automatically shift by a continuously variable transmission mechanism during running, If necessary, the vehicle is stopped once, and then switched to forward low speed or reverse driving.

Japanese Patent Laid-Open Publication No. Hei 8-337131 discloses a shift operation device for an uneven terrain vehicle that can switch between forward high speed, low forward speed, neutral, and reverse with a single shift operation lever. Or JP-A-2-20307
No. 9 discloses this.

FIGS. 10 and 11 show the former off-road vehicle, in which a single shift operation lever 101 is supported by an engine 102 as shown in FIG. It is formed in an L-shape so as to protrude rightward from the right side surface of 102 and then stand up. As shown in FIG. 11, the shift operation lever 101 is provided with a first lever mechanism 105 for switching between forward, neutral, and reverse, and a second lever mechanism 106 for switching between forward high speed and forward low speed. I have. Double lever mechanism 1
Numerals 05 and 106 are formed so as to protrude toward the left and right central portions of the engine 102, and rods 107 and 108, respectively.
Or a wire is connected. That is, the number of shift operation levers 101 is one, but two lever mechanisms 105,
A shift fork for switching between forward, neutral, and reverse and a shift fork for switching between high-speed forward and low-speed forward are provided via 106 and two rods 107 and 108, respectively. Further, an H-shaped shift guide groove as shown in FIG. 10 is formed in the side of the vehicle body in the gate 109 for guiding the operation of the shift operation lever 101.

FIG. 12 shows the latter vehicle on rough terrain, in which a single shift operation lever 201 is arranged on the side of the engine 202, and the shape of the shift operation lever 201 projects outward in the left-right direction. It has a bent shape. A cam drum (change drum) 206 is housed in the upper part of the transmission case 205 as a shift fork drive member interlockingly connected to the shift operation lever 201. By rotating the cam drum 206, two shift forks are provided. Is configured to perform a moving operation.

[0006]

In any of the conventional examples, a single shift operation lever can be used to switch between forward high speed, low forward speed, neutral, and reverse.
In the first case, the shift operation lever 101 is
2, the space around the rider's foot is limited, and the rider's foot hits the shift operation lever 201, and the ride comfort is reduced. Further, it is necessary to operate the shift operation lever back and forth and up and down along the H-shaped shift guide groove provided on the side of the vehicle body, and the operability is not good.

Further, a rod 10 for connecting the shift operation lever 101 to a shift fork in a transmission case is provided.
Since the members 7 and 108 are arranged at the center in the left and right width of the engine 102, it takes time to assemble the rods 107 and 108 and adjust the length.

In addition, two rods 107 and 108 must be provided for switching between forward high speed and forward low speed, and two for switching between forward, neutral and reverse travel. Requires a large space, and it is difficult to arrange various equipment such as an air cleaner at the center of the engine.

Since the latter gear shift operating device for an uneven terrain vehicle has a structure in which the cam drum 206 is disposed in the transmission case 205, a large space is required for the cam drum, and the transmission case 205 becomes large. Since one cam drum 206 is used to move two shift forks, the transmission case 205
The internal structure is complicated and the cost is high. Also, since the shift operation lever 101 is at a low position on the side of the vehicle body,
Space around feet is limited.

[0010]

SUMMARY OF THE INVENTION The present invention simplifies an operating force transmission mechanism from a shift operating lever to a shift fork when switching between forward high speed, forward low speed, neutral and reverse is performed by a single shift operating lever. Another object of the present invention is to secure the space around the rider's feet, reduce the number of parts, reduce the weight, and improve the assemblability by effectively utilizing the space of the traveling vehicle. It also aims to improve operability.

[0011]

According to a first aspect of the present invention, there is provided a speed change operation device for an uneven terrain vehicle according to the present invention.
Equipped with a continuously variable transmission mechanism and a gear type transmission mechanism from the power upstream side,
The gear-type speed change mechanism allows at least forward high speed, low forward speed, neutral and reverse to be switched by a single shift fork, and a shift extending upward above the engine and below the vicinity of one of the left and right sides of the steering handle. An operation lever is provided, and one change lever shaft interlockingly connected to the shift fork is provided at the rear end of the engine on the same side as the side where the shift operation lever is disposed so as to protrude upward, and the change lever shaft and the shift operation lever are provided. And are linked via a single connecting rod along the side of the engine. This allows
The shift operation force transmission mechanism from the shift operation lever to the shift fork can be simplified and compactly arranged, and a large space around the rider's feet can be secured, so that a comfortable ride can be obtained. Further, the number of parts such as the cam drum and the connecting rod can be reduced, and the weight can be reduced.

According to a second aspect of the present invention, in the transmission for an uneven terrain vehicle according to the first aspect, a torsion coil spring is mounted on the change lever shaft, and the shift fork is operated via the torsion coil spring. I have to. Thereby, the repelling phenomenon of the dog claw generated at the time of the shift operation can be absorbed by the torsion coil spring, and is not transmitted to the shift operation lever, and the operability is improved.

According to a third aspect of the present invention, in the transmission for an uneven terrain vehicle according to the first or second aspect, an upward shift guide groove extending in the front-rear direction is formed in the gate for guiding the operation of the shift operation lever. At a predetermined position in the front-rear direction of the shift guide groove, forward and low speed, forward and high speed, neutral and reverse engaging portions are formed on the same left and right sides. Thereby, the space around the gate can be kept compact.

According to a fourth aspect of the present invention, in the speed change operating device for an uneven terrain vehicle according to the third aspect, the shift operating lever is provided in the guide groove between the forward high speed engaging portion and the forward low speed engaging portion. Is temporarily stopped in a neutral state to form an intermediate stopper. Thereby, when switching from the forward high speed state to the forward low speed state, it is possible to shift to the forward low speed state with a smooth operation.

According to a fifth aspect of the present invention, in the transmission for an uneven terrain vehicle according to the third or fourth aspect, the shift operation lever is supported rotatably forward and backward and left and right via a spherical support mechanism. The shift guide groove is urged by a spring toward the side where each engaging portion is formed. Thus, the structure of the support portion of the shift operation lever can be made compact, and the shift operation lever can be locked and held at each gear position with a simple structure.

The invention according to claim 6 is the invention according to claims 1, 2, and
The shift operating device for an uneven terrain vehicle according to 3, 4, or 5, wherein the shift operating lever and the change lever shaft are connected substantially linearly. Thus, the shift operation force transmission mechanism can be made more compact.

[0017]

FIG. 1 is a plan view of an all-terrain four-wheeled vehicle to which the present invention is applied. The vehicle includes a pair of front wheels 1 on the left and right and a pair of rear wheels 2 on the left and right. , A bar-shaped steering handle 4 is disposed on the front side, and a seat 6 is disposed on the rear side of the handle 4 via a cover 5. Is Step 7
Is provided. An air cleaner 10 is disposed in the cover 5, and an engine 12 is mounted below the air cleaner 10 to reach a lower front portion of the seat 6.

For convenience of explanation, as described in FIG. 1 as "left" and "right", the left-right direction viewed from the rider is defined as the left-right direction of the vehicle traveling on rough terrain, and will be described below. A shift operation lever 15 for performing a shift operation between the forward high speed, forward low speed, neutral, and reverse speeds is disposed in the right side wall of the cover 5 and below the right side portion of the handle 4. . A single change lever shaft 2 projecting upward is provided on the upper surface of the right rear end of the crankcase portion 12a of the engine 12.
1 and an outer change lever portion 23a provided at an upper end of the change lever shaft 21 and the shift operation lever 15 are connected to a single linear connecting rod 20 arranged along the right side surface of the engine 12. Linked together.

FIG. 2 is a front view, in which front fenders 8 are arranged on the front wheels 1 respectively.

FIG. 3 is a view taken in the direction of the arrow III in FIG. 1 (a side view as viewed from the right side). A V-type two-cylinder engine is mounted as the engine 12, and a V-belt is provided on the right side of the crankcase portion 12a. A continuously variable transmission mechanism 27 is disposed (FIG. 1).
The belt-type continuously variable transmission mechanism 27 is connected to the output shaft 2 of the engine 12.
8 and a driven shaft 31a at the rear.
, A driven pulley 32 provided on the
The pulleys 30 and 3 are configured by a V-belt 33 wound around the pulleys.
The sheave interval forming the second gear 2 is automatically adjusted to perform automatic stepless transmission.

The shift operation lever 15 has a lower end disposed above the engine 12 and linearly extending upward, and has a gate 16 provided on the upper surface of the right side wall of the cover 5.
The grip 15a of the operating lever 15 is located between the handle 4 and the upper surface of the cover 5 through the shift guide groove 17 of the first embodiment. The connecting rod 20 extends obliquely downward on the right side of the engine 12 from the shift operation lever 15 to the outer change lever portion 23a of the rear change lever shaft 21.

FIG. 6 is an exploded cross-sectional view of the inside of the crankcase section 12a taken along a plane passing through the respective transmission shaft cores, and clearly shows the structure of the gear type transmission mechanism. Crankcase part 1
In 2a, an input transmission shaft 31, integrally formed with a driven shaft 31a of the driven pulley 32, first and second intermediate transmission shafts 41 and 42, and an output shaft 43 are arranged in parallel. In addition, a propeller shaft 44 is disposed at right angles to the output shaft 43 and horizontally. A high-speed forward gear 50 and a low-speed forward gear 51 are arranged in parallel on the driven pulley 32 side of the input transmission shaft 31, that is, near the right bearing 46, and a reverse gear is provided near the left bearing 47. A shift sleeve 54 is spline-fitted to a central portion in the axial direction so as to be movable in the axial direction.

The reverse gear 52 has a dog claw 52a on the right end face.
Input shaft 31 via a needle bearing
Is rotatably fitted to. The forward low-speed gear 51 has a dog claw 51a at a tip end of a boss portion 51b extending leftward passing through the inner peripheral side of the forward high-speed gear 50,
It is rotatably fitted to the input transmission shaft 31 via a needle bearing. The forward high-speed gear 50 has an inward dog claw 50a at the tip of an arm 50b extending leftward, and rotatably fits around the outer periphery of the boss 51b of the forward low-speed gear 51 via a needle bearing. ing. On the left end surface of the shift sleeve 54, a reverse dog claw 54a that can mesh with the dog claw 52a of the reverse gear 52 is formed, and on the right end surface, any one of the dog claw 50a of the forward high speed gear 50 and the low speed gear 51 , 51a are also formed with an L-shaped forward dog claw 54b that can be engaged.

Dog claws 50 for forward high speed and forward low speed
a, 51a is at least two dog claws 50
The forward dog claw 54b of the sleeve 54 is secured to a neutral state between the a and 51a.

A single shift fork 60 is fitted in the outer peripheral annular groove of the shift sleeve 54, and the shift fork 60 is fixed to a shift rod 61 supported by the crankcase portion 12a so as to be movable in the left-right direction. Rod 6
1 and can be moved in the left-right direction. The illustrated state of the shift fork 60 indicates a neutral state. When the shift fork 60 moves leftward from the neutral state, the shift sleeve 5
4 is the dog claw 52a of the reverse gear 52
a, and moves to the right, first, the forward dog claws 54b of the shift sleeve 54 mesh with the dog claws 50a of the forward high-speed gear 50, and then the two forward dog claws 50a,
It is configured to mesh with the dog claw 51a of the forward low-speed gear 51 through the neutral state between 50b. That is, 1
By shifting the shift fork 60 in the axial direction, it is possible to switch to four speed stages of forward high speed, forward low speed, neutral and reverse.

The first intermediate shaft 41 has a forward intermediate gear 5 meshed with the forward high-speed and low-speed gears 50 and 51, respectively.
The intermediate output gear 57 is fixed together with the intermediate gears 5, 56, and the reverse intermediate gear 58 meshing with the reverse gear 52 and the intermediate gear 59 meshing with the intermediate output gear 57 are fixed to the second intermediate shaft 42. I have. The intermediate output gear 57 meshes with the gear 62 of the output shaft 43, and the output shaft 43 and the propeller shaft 44 are linked to each other via bevel gears 63 and 64.

The propeller shaft 44 extends horizontally in the front-rear direction, and the rear end is connected to the rear axle via a final reduction mechanism.
The front end is connected to the front wheel propeller shaft via a suitable universal joint or clutch.

At the left end of the shift rod 61, four notches 65 for positioning at each shift speed are formed at predetermined intervals in the axial direction.
The ball 67 urged by is engaged. Notch 6 above
5 is for reverse positioning, neutral positioning,
It is for forward high-speed positioning and forward low-speed positioning. The right end of the shift rod 61 is the crankcase 1
A change pin 70 protruding into a change lever chamber 68 formed at the upper rear right end of the rear portion 2a and projecting upward is provided. The change lever shaft 21 is rotatably supported by the upper wall case 71 of the change lever chamber 68 in an upright posture, and the change lever shaft 21 protrudes upward. The outer change lever portion 23a bent in a letter shape is fixed.

FIG. 7 is a longitudinal sectional view of the change lever chamber 68. The boss 23d of the inner change lever 23b is fixed to the lower end of the change lever shaft 21, and the outer periphery of the boss 23d A torsion coil spring 72 is rotatably wound around the boss 23d. Both ends 70a of the torsion coil spring 72 linearly extend toward the change pin 70, and are bent at the tip end portion 2 of the inner change lever portion 23b.
By engaging with both end edges of 3c, it rotates integrally with the inner change lever portion 23b.

FIG. 8 is a plan view showing the upper wall cover 71 of FIG. 7 with the cover 73 removed, and an opening 73 having a large play with respect to the change pin 70 is formed in the inner change lever portion 23b. The linear end portions 72a of the torsion coil spring 72 sandwich the change pin 70 with a constant elastic force, so that the change pin 70 can be moved in the left-right direction with the rotation of the torsion coil spring 72. Sign F
L, FH, N, and R indicate a forward low speed position, a forward high speed position, a neutral position, and a reverse position of the change pin 70, respectively.

FIG. 4 shows a shift operation force transmission mechanism from the shift operation lever 15 to the change lever shaft 21. A spherical joint 75 is provided on the outer change lever portion 23a, and the connecting rod 20 is attached to the spherical joint 75. Are connected at the rear end. The lower end of the shift operation lever 15 is rotatably supported by a rear-opening U-shaped support bracket 77 via a spherical support mechanism (pillow ball) 76, and the support bracket 77 is fixed to a right frame 78 of the vehicle body. ing. A rearwardly opened V-shaped bracket 80 is welded to a middle portion of the shift operation lever 15, and the bracket 80 is turned substantially upwardly via a pin 81 extending substantially in the left-right direction as shown in FIG. A joint 82 is movably supported, and the front end of the connecting rod 20 is connected to the joint 82 so that the rod length can be adjusted. A coil spring 83 for urging the shift operation lever 15 to the left is stretched between the left wing portion of the bracket 80 and the vehicle body frame 84 or the like.

FIG. 9 is a plan view of the gate 16 having the shift guide groove 17, and the shift guide groove 17 is arranged in order from the rear with respect to the movement groove extending substantially in the front-rear direction. The engaging portion 87, the high-speed forward engaging portion 88, and the forward low-speed engaging portion 89 are formed at predetermined intervals, and the engaging portions 86, 87, 88, and 89 all project to the left. Is formed. The so-called shift guide groove 17 has a straight shape with respect to the conventional H-shape, but has a path 90 between the reverse engagement portion 86 and the neutral engagement portion 87 and a forward engagement with the neutral engagement portion 87. The paths 91 between the high-speed engaging portions 88 are each shaped to be inclined rightward and forward. An intermediate stopper edge 95 for temporarily stopping the shift operation lever 15 in a neutral state is formed in the middle of a path 92 between the forward high speed engaging portion 88 and the forward low speed engaging portion 89. It bends to the right from the edge 95, and then leans forward to the left to engage the forward low-speed engaging portion 8.
9 are formed. Incidentally, the position of the shift operation lever 15 on the stopper edge 95 is such that the forward dog claw 54b of the shift sleeve 54 is located between the forward high dog dog 50a and the forward low dog dog 51a in FIG. Corresponds to the state.

[0033]

[Operation and Operation] In FIG. 3, during the shift operation, the shift operation lever 15 is located above the engine 12 and below the right side of the handlebar 4 and is arranged in a substantially upright posture. The space around the foot can be sufficiently secured without obstructing the rider's foot, and the rider can perform the shift operation in a substantially running posture. Further, the position of the shift operation lever 15 in the shift guide groove 17 can be easily confirmed.

The shift operation by the shift operation lever 15 is performed with the vehicle stopped. When the shift operation lever 15 is in the neutral position and the engine 12 is idling, the V-belt continuously variable transmission mechanism 27 is basically in a neutral state. However, FIG.
The dog claws 54a, 54b of the shift sleeve 54 are the dog claws 50a, 51a, 52 of any of the gears 50, 51, 52.
a, the input transmission shaft 31 is rotated with a slight torque due to a drag phenomenon caused by the frictional force between the belt 33 and the driven pulley 32.

[Shift from neutral state to forward high speed state] In FIG. 9, when the shift operation lever 15 is pushed forward from the neutral position N, the shift operation lever 15
Is guided to the right front and abuts on the front end convex portion 97 of the inclined path 91. By contacting the convex portion 97, it is confirmed that the vehicle has reached the front-rear position corresponding to the forward high-speed engaging portion 88, and the shift operation lever 15 is returned to the left to engage with the forward high-speed engaging portion 88. I do. This engaged state is maintained by the elastic force of the urging coil spring 83 in FIG.

By operating the shift operation lever 15 from the neutral position to the forward high-speed position as described above, the outer change lever portion 23a is pulled forward through the connecting rod 20, and the inner change lever portion 23 is changed through the change lever shaft 21. The lever 23b is turned rightward (S1 direction) from the neutral position N in FIG.

The torsion coil spring 72 also rotates in the S1 direction with the rotation of the change lever 23b, and the change pin 7
0 is moved rightward to the forward high speed position FH. Accordingly, the shift rod 61, the shift fork 60 in FIG. 6, and the shift sleeve 54 also move rightward, and the shift sleeve 5
The fourth forward dog claw 54b is engaged with the forward high speed dog claw 51a. As described above, since the input transmission shaft 31 rotates with a small torque, the rotation of the input transmission shaft 31 allows the two dog claws 54b and 50a to quickly match in phase and mesh with each other.

During the shifting operation, the dog claws 54b and 50a may be repelled by the contact between the dog claws 54b and 50a. However, the impact is absorbed by the torsion coil spring 72 and is not transmitted to the shift operating lever 15.

[Shift from Forward High Speed State to Forward Low Speed State] The vehicle shown in FIG.
Is in the neutral state and the shift operation lever 15 is in the forward high-speed position, the shift sleeve 54 in FIG.
Dog claw 54b for forward movement and dog claw 5 for gear 50 for forward high speed
0a is engaged, the driven pulley 32 and V
The rotation caused by the frictional force of the belt 33 is completely braked, and the input transmission shaft 31 is completely stopped.

In FIG. 9, when the shift operating lever 15 is pushed forward from the forward high-speed position FH, the shift operating lever 15 temporarily stops by contacting the stopper edge 95 in the middle of the path 92. At this time, the forward dog claw 54b of the shift sleeve 54 in FIG. 6 is located between the dog claw 50a of the forward high-speed gear 50 and the dog claw 51a of the forward low-speed gear 51 and temporarily becomes neutral. Then, the entrainment by the driven pulley 32 is restored, and the input transmission shaft 31 is rotated by a weak torque.

Thereafter, the shift operation lever 15 shown in FIG. 9 is disengaged rightward from the stopper edge 95 and is pushed forward again.
Leads to.

Thus, the forward dog claw 54b of the shift sleeve 54 shown in FIG.
a, and the vehicle enters the forward low speed state.

[Shift from neutral state to reverse state] In FIG. 9, the shift operation lever 15 is temporarily disengaged from the neutral position N to the right and pushed rearward to be guided leftward and backward along the inclined path 90, and to move backward. Engaging portion 86.

As described above, the shift operation lever 15 shown in FIG.
Is operated from the neutral position N to the reverse position R, so that the outer change lever portion 23 is connected via the connecting rod 20 shown in FIG.
8a is pushed rearward, and the inner change lever portion 23b is rotated leftward (in the direction S2) from the neutral position N in FIG.

The torsion coil spring 72 also rotates in the S2 direction with the rotation of the change lever 23b, and the change pin 7
0 is moved leftward to the reverse position R. As a result, the shift rod 61, the shift fork 60, and the shift sleeve 54 in FIG.
4a is engaged with the reverse gear dog claw 52a.

[0046]

[Other embodiments of the invention] (1) The present invention can also be applied to a six-wheeled vehicle traveling on uneven terrain.

(2) Although the illustrated embodiment has a structure in which an air cleaner is disposed on a cover between a seat and a handle, it can be applied to a structure in which a fuel tank is disposed.

[0048]

As described above, according to the present invention, (1) the gear type speed change mechanism can switch at least forward high speed, forward low speed, neutral and reverse with a single shift fork, and A shift operation lever extending upward is provided below the left and right sides of the steering handle at one position, and one change lever shaft interlockingly connected to the shift fork is connected to the shift operation lever at the rear end of the engine. The change lever shaft and the shift operation lever are interlockingly connected via a single connecting rod along the side of the engine. Simplifies the shift operation force transmission mechanism and allows it to be compactly arranged, while ensuring ample space around the rider's feet for a comfortable ride. be able to. Further, the number of parts such as the change drum and the connecting rod can be reduced, and the weight can be reduced.

(2) When a torsion coil spring is mounted on the change lever fixed to the change lever shaft, and the shift fork is operated via the torsion coil spring, the dog claws generated during the shift operation are disengaged. The repelling phenomenon can be absorbed by the torsion coil spring, and is not transmitted to the shift operation lever, thereby improving operability.

(3) A shift guide groove extending in the front-rear direction is formed in the gate for guiding the operation of the shift operation lever, and at a predetermined position in the front-rear direction of the shift guide groove, the forward low-speed operation, forward high-speed operation, neutral operation, and neutral operation are performed. If the reverse engagement portion is formed on the same side on the left and right, the space around the gate can be kept compact.

(4) If an intermediate stopper for temporarily stopping the shift operation lever in a neutral state is formed in the middle of the guide groove between the forward high speed engaging portion and the forward low speed engaging portion, the forward high speed When the vehicle is switched from the low speed state to the forward low speed state, the driven state is temporarily returned to neutral so that the driven pulley is restored, and the dog clutch is smoothly connected to the forward low speed gear.

(5) The shift operation lever is supported rotatably back and forth and left and right via a spherical support mechanism, and is biased by a spring toward the formation side of each engagement portion of the shift guide groove. The structure of the support portion of the shift operation lever can be made compact, and the shift operation lever can be locked and held at each shift position with a simple structure.

(5) If the shift operating lever and the change lever shaft are connected substantially linearly, the shift operating force transmitting mechanism can be made more compact.

[Brief description of the drawings]

FIG. 1 is a plan view of an all-terrain vehicle to which the present invention is applied.

FIG. 2 is a front view of the off-road vehicle shown in FIG. 1;

FIG. 3 is a view taken in the direction of arrow II in FIG. 1;

FIG. 4 is a side view of a shift operation force transmission mechanism from a shift operation lever to a change lever shaft.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is an exploded cross-sectional view of the gear type transmission mechanism, taken along a plane passing through each transmission shaft.

FIG. 7 is an enlarged cross-sectional view taken along the line VII-VII of FIG. 6;

8 is a plan view showing the change lever chamber of FIG. 7 with an upper wall cover removed.

FIG. 9 is an enlarged plan view of a gate.

FIG. 10 is a perspective view of a conventional example.

FIG. 11 is an enlarged view of a vertical step surface of a shift operation lever portion of FIG. 10;

FIG. 12 is a side view of another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front wheel 2 Rear wheel 5 Cover 6 Seat 12 Engine 12a Crankcase part 15 Shift operation lever 16 Gate 17 Shift guide groove 21 Change lever shaft 23a, 23b Change lever part 27 V belt type continuously variable transmission mechanism 50 Forward high speed gear 51 Forward low speed gear 52 Reverse gear 50a, 51a, 52a Dog pawl 54 Shift sleeve 54a, 54b Dog pawl 60 Shift fork 61 Shift rod 70 Change pin 72 Torsion coil spring 76 Spherical support mechanism 83 Urging spring 95 Intermediate stopper edge (intermediate) stopper)

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B62M 25/04 B62M 25/04 C F16H 63/04 F16H 63/04 63/30 63/30 G05G 1/04 G05G 1/04 A F term (reference) 3D011 AA07 AB01 AG04 AH01 AJ02 3D040 AA01 AB10 AC16 AC24 AC28 AC43 AC44 AC65 AD08 AF07 3J067 AA02 AB01 AC07 AC23 BA13 DA03 DA55 DA63 FB83 GA01 3J070 AA03 AA23 BA05 BA07 BA05 BA05 BA05 BA05

Claims (6)

[Claims] 1. A continuously variable transmission mechanism and a gear-type transmission mechanism are provided from the power upstream side. The gear-type transmission mechanism is capable of switching at least forward high speed, forward low speed, neutral and reverse with a single shift fork. A shift operation lever extending upward is provided below the left and right sides of the steering handle at a higher position, and a single shift lever shaft interlockingly connected to the shift fork is provided at the rear end of the engine at the shift end. An uneven terrain characterized in that the change lever shaft and the shift operation lever are interlockingly connected via a single connecting rod along the side of the engine, provided on the same side as the operation lever arrangement side so as to protrude upward. Transmission operating device for traveling vehicles. 2. The shift operation of an uneven terrain vehicle according to claim 1, wherein a torsion coil spring is mounted on the change lever shaft, and the shift fork is operated via the torsion coil spring. apparatus. 3. A shift guide groove extending in the front-rear direction is formed in a gate for guiding the operation of the shift operation lever, and at a predetermined position in the front-rear direction of the shift guide groove, forward low speed, forward high speed, neutral, and reverse. The shift operating device for an uneven terrain traveling vehicle according to claim 1, wherein the engagement portions are formed on the same left and right sides. 4. An intermediate stopper for temporarily stopping a shift operation lever in a neutral state in a guide groove between a forward-moving high-speed engaging portion and a forward-moving low-speed engaging portion. 3. The shift operating device for an uneven terrain vehicle according to claim 3. 5. The shift operation lever is rotatably supported back and forth and left and right via a spherical support mechanism, and is biased by a spring toward a side of the shift guide groove where each engagement portion is formed. The speed change operating device for an uneven terrain vehicle according to claim 3 or 4, wherein: 6. A shift operation lever and a change lever shaft are connected substantially linearly.
The speed change operation device for an uneven terrain vehicle according to 2, 3, 4, or 5.