JP2016130031A - Tricycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately and surely execute interlocking operation between tilting of a vehicle body 44 and rotation of a steering shaft 53 for a long period of time.SOLUTION: A first bevel gear 56 is fixed to a lower end part of a steering shaft 53, and a second bevel gear 57 is supported by a front frame 31, and when tilting of a vehicle body 44 is interlocked with rotation of the steering shaft 53 by meshing these first bevel gear 56 and second bevel gear 57, even when slight dust intrudes between the first and second bevel gears 56 and 57 during traveling of a tricycle, an influence is hardly received from the dust since both the bevel gears only partly mesh, and the bevel gears are durable for a long-term use since strength is greatly high as compared with a wire, and interlocking operation can be accurately and surely executed for a long period of time.SELECTED DRAWING: Figure 4

Description

    The present invention relates to a three-wheeled vehicle having a pair of front wheels and one rear wheel, the vehicle body being tiltable.

    As a conventional three-wheel vehicle, for example, a vehicle described in Patent Document 1 below is known.

JP 2001-010577 A

  This is connected to a support frame rotatably supported by a pair of front wheels that are separated in the width direction and upright with respect to the ground, and is connected to the support frame so as to be able to rotate around a rotation axis extending in the front-rear direction. A vehicle body that is rotatably supported by one rear wheel and tilts by rotating around the rotation shaft; a steering shaft that is rotatably supported by the vehicle body and has a handle attached to the upper end; and a steering shaft Steering means for transmitting the rotation of the front wheel to the pair of front wheels, steering the front wheel, a plate fixed to the lower end of the steering shaft, the plate, the support frame, and a pair of double structure wires for connecting the vehicle bodies to each other And an interlocking means for interlocking the tilt with the vehicle body and the rotation of the steering shaft.

    However, in such a conventional three-wheeled vehicle, a double-structured wire consisting of an inner wire and an outer wire is used as the interlocking means. Therefore, if dust enters between the inner and outer wires, the inner and outer wires As a result, there is a problem that the above-described interlocking becomes inaccurate. In addition, since such a wire has a small diameter, it may deteriorate due to long-term use and break in the middle. In such a case, there is a problem that the interlocking operation cannot be performed.

  An object of the present invention is to provide a three-wheeled vehicle capable of accurately and reliably performing a linked operation of rotation of a steering shaft and tilting of a vehicle body for a long period of time.

    Such a purpose is connected to a front frame in which a pair of front wheels separated in the width direction and upright with respect to the ground S are rotatably supported, and to the front frame so as to be rotatable about a rotation axis Z extending in the front-rear direction. On the other hand, one rear wheel is rotatably supported at the rear end portion, and the vehicle body can be tilted while rotating around the rotation axis Z, and the handle is attached to the upper end portion while being rotatably supported by the vehicle body. A steering shaft, steering means for transmitting the rotation of the steering shaft to the pair of front wheels to steer the front wheels, a first bevel gear fixed to a lower end portion of the steering shaft, and a front frame, This can be achieved by a three-wheeled vehicle including a second bevel gear that interlocks the tilting of the vehicle body and the rotation of the steering shaft by meshing with the first bevel gear.

  In the present invention, the first bevel gear is fixed to the lower end portion of the steering shaft, the second bevel gear is supported on the front frame, and the first bevel gear and the second bevel gear are engaged with each other to tilt the vehicle body. And the rotation of the steering shaft are interlocked so that even if some dust enters between the first and second bevel gears while the three-wheeled vehicle is running, both bevel gears mesh only with a part of them. Because it is not, it is hardly affected by the dust. Moreover, the strength of the bevel gear is significantly higher than that of the wire, so it can withstand long-term use, and this ensures that the interlocking movement between the tilting of the vehicle body and the rotation of the steering shaft is accurate and reliable for a long time. Can be done.

  According to the second aspect of the present invention, the tilting of the vehicle body and the rotation of the steering shaft can be reliably interlocked while preventing the reverse rotation of the steering shaft when the vehicle body is tilted. Furthermore, if comprised as claimed in claim 3, it is possible to secure a wide space behind the second bevel gear, thereby easily improving the degree of freedom of design. Moreover, if comprised as described in Claim 4, a high reduction ratio can be obtained easily, although it is small. Further, if configured as described in claim 5, the vehicle body can be easily returned from tilting while it can be installed in a narrow space.

It is a schematic side view which shows Embodiment 1 of this invention. It is a front part top view of a three-wheeled vehicle. It is a front part front view of a three-wheeled vehicle. It is side surface sectional drawing of the planetary gear mechanism vicinity. It is sectional drawing similar to FIG. 4 which shows Embodiment 2 of this invention. It is sectional drawing similar to FIG. 4 which shows Embodiment 3 of this invention. It is sectional drawing similar to FIG. 4 which shows Embodiment 4 of this invention.

Embodiment 1 of the present invention will be described below with reference to the drawings.
1-4, 11 is a front two-wheeled three-wheel vehicle with a power source, and this three-wheeled vehicle 11 has a frame body 12 made of a rigid body at the front thereof. Here, in the description of this embodiment, front and rear, left and right, and up and down directions mean front and rear, left and right, and up and down directions as viewed from the driver facing the front of the vehicle body. Reference numeral 13 denotes a pair of knuckles supported at the front end portion of the frame body 12 at the left and right end portions thereof via a king pin 14 extending in a substantially vertical direction. The knuckle 13 can rotate about a horizontal axis. A pair of such front wheels 15 are supported apart in the width direction of the three-wheeled vehicle 11. As a result, the pair of front wheels 15 swings left and right around the king pin 14 while maintaining a state of being upright with respect to the ground S on the frame body 12 (without rotating the tilting axis even when the three-wheel vehicle 11 is turning). Will be supported as possible. A gear case 17 is fixed to the rear upper surface of the frame body 12 via a bracket 16, and horizontal pins 19 extending in the front-rear direction are attached to the left and right ends of the front of the gear case 17 via brackets 18 respectively. At the same time, the center portions of the pair of side links 20 extending in the vertical direction are rotatably supported by these pins 19.

  A horizontal transmission shaft 22 extending in the front-rear direction is rotatably supported by the gear case 17 by a plurality of bearings 21, and a front end portion of the transmission shaft 22 projects forward from the gear case 17. A lower end portion of a central link 23 extending in the vertical direction is fixed to the front end portion of the transmission shaft 22, and a central portion of a horizontal link 25 extending in the left-right direction via a pin 24 is rotatable at the upper end portion of the central link 23. It is connected to. And the upper end part of the side link 20 is rotatably connected to both ends (left and right end parts) of the horizontal link 25 via pins 26. At this time, the distance between the pair of pins 26 is The transmission shaft 22 is positioned on a straight line connecting the pair of pins 19 and the pin 24 is positioned on a straight line connecting the pair of pins 26. As a result, when the transmission shaft 22 rotates around the central axis (rotation axis Z) of the transmission shaft 22 extending in the front-rear direction, and the central link 23 swings left and right around the rotation axis Z, the swing is the lateral link 25. Thus, the side link 20 is synchronously rocked by the same angle in the same direction while maintaining a parallel relation with the central link 23 around the pin 19.

  The base end (rear end) of pins 29 extending in the front-rear direction and having the same length is fixed to the lower end portion of the side link 20, and the inner end of the tie rod 30 extending in the left-right direction is fixed to the front end (front end) of these pins 29. Are connected by ball joints. The outer ends of the tie rods 30 are connected to the knuckle 13 via ball joints. As a result, when the side link 20 swings as described above, the knuckle 13 pivots about the king pin 14 and a pair of The three-wheeled vehicle 11 is steered with the front wheels 15 swinging in the same direction and by the same angle. The frame body 12, the bracket 16, and the gear case 17 as a whole constitute a front frame 31 that rotatably supports a pair of front wheels 15 that are separated from each other in the width direction and are upright with respect to the ground S, and the knuckle 13, The side link 20, the lateral link 25, and the tie rod 30 as a whole constitute a steering means 32 that transmits the rotation of a steering shaft, which will be described later, to the pair of front wheels 15 to steer the pair of front wheels 15. In the present invention, a well-known worm roller type or rack and pinion type may be used as the steering means.

  Reference numeral 35 denotes a connecting block installed on the rear side of the front frame 31, and a front end portion of a rear frame 36 that extends while tilting upward toward the rear is fixed to the connecting block 35. A rearwardly extending case 37 is fixed to the central portion of the rear frame 36, and one rear wheel 38 that is rotatable about a horizontal axis is supported at the rear end of the case 37. A power source including an engine or an electric motor and a power unit including a transmission device and the like are housed and fixed in the case 37, and the rear wheel 38 can be rotated by a rotational driving force applied from the power unit. Reference numeral 39 denotes a shock absorber interposed between the rear end portion of the rear frame 36 and the rear wheel 38. These shock absorbers 39 absorb an impact applied to the rear wheel 38 from the ground S, and the three-wheeled vehicle 11 Improve the vibration ride comfort.

  A gear box 42 having a closed space formed therein is fixed to the front end of the connection block 35, and a lower end of a support post 43 extending in a substantially vertical direction is fixed to the connection block 35. The connecting block 35, the rear frame 36, the case 37, the gear box 42, and the support post 43 described above constitute a vehicle body 44 in which one rear wheel 38 is rotatably supported at the rear end portion. The vehicle body 44 can tilt around the rear wheel 38 that is in contact with the ground surface S. A rear end portion of the transmission shaft 22 penetrates through the front wall of the gear box 42, and the penetration portion of the transmission shaft 22 is rotatably supported by the gear box 42 via a plurality of bearings 45. Thus, the transmission shaft 22 provided in the front frame 31 (gear case 17) extending in the front-rear direction is rotatably supported by the vehicle body 44 (gear box 42) via the bearing 45, so that the vehicle body 44 is It is connected to the front frame 31 so as to be able to rotate around the central axis (rotation axis Z) of the transmission shaft 22 extending in the front-rear direction. As a result, the vehicle body 44 tilts while rotating around the rotation axis Z. .

  Reference numeral 48 denotes an upper steering shaft rotatably supported on the upper end portion of the support post 43. The upper steering shaft 48 tilts backward as it goes from the lower end to the upper end, and the upper end portion in the left-right direction. The central part of the extending handle 49 is connected. An upper end of a lower steering shaft 51 that is orthogonal to the transmission shaft 22 and extends in the vertical direction is connected to a lower end of the upper steering shaft 48 via a universal joint 50. As a result, the lower steering shaft 51 is connected to the upper steering shaft 51. Can rotate integrally with 48. A lower end portion of the lower steering shaft 51 penetrates the upper wall of the gear box 42 and is rotatably supported by the gear box 42 via a bearing 52. As described above, the lower steering shafts 48 and 51 as a whole constitute a steering shaft 53 that is rotatably supported by the vehicle body 44 (the gear box 42 and the support post 43) and has a handle 49 attached to the upper end. The steering shaft 53 rotates to apply a steering force to the steering means 32 described above and control the traveling direction of the three-wheeled vehicle 11.

  A first bevel gear 56 is fixed to the lower end portion of the steering shaft 53 (lower steering shaft 51) protruding inside the gear box 42, and at the rear end portion of the transmission shaft 22 protruding inside the gear box 42. Is fixed in front of the first bevel gear 56, here, a second bevel gear 57 installed between the first bevel gear 56 and the front wheel 15, and the second bevel gear 57 is fixed to the first bevel gear 56. Are engaged. Here, since the transmission shaft 22 is supported by the front frame 31 (gear case 17), the second bevel gear 57 is supported by the front frame 31. 58 is an internal gear composed of a spur gear attached to the front frame 31 (gear case 17) between the central link 23 and the bearing 45, and the transmission shaft 22 at a position overlapping with the internal gear 58 in the radial direction includes A sun gear 59 made of a spur gear is connected (fixed). Between the internal gear 58 and the sun gear 59, a plurality of planetary gears 60 that are equiangularly spaced apart in the circumferential direction are provided, and these planetary gears 60 mesh with both the internal gear 58 and the sun gear 59.

  Reference numeral 61 denotes a plurality of horizontal carrier shafts extending in the front-rear direction, the rear ends of which are fixed to the vehicle body 44 (the front wall of the gear box 42). The front ends of these carrier shafts 61 are connected to the planetary gear 60, respectively. (Fixed). In this way, the internal gear 58 is attached to the front frame 31, the sun gear 59 and the second bevel gear 57 are connected via the transmission shaft 22, and the planetary gear 60 and the vehicle body 44 are connected via the carrier shaft 61. When the gear box 42 is rotated about the rotation axis Z due to the tilt of the vehicle body 44, the rotation of the gear box 42 is transmitted to the planetary gear 60 through the carrier shaft 61, and the planetary gear 60 is transmitted to the sun. Rotate and revolve around the gear 59. Accordingly, the rotation of the gear box 42 is transmitted to the sun gear 59 while being accelerated, and the sun gear 59 together with the transmission shaft 22 and the second bevel gear 57 is faster than the rotation speed of the gear box 42 (vehicle body 44). Rotate in the same direction as the box 42 (vehicle body 44). The internal gear 58, the sun gear 59, and the planetary gear 60 described above are disposed behind the steering means 32 and in front of the second bevel gear 57, and accelerate the rotation about the rotation axis Z based on the tilt of the vehicle body 44. The planetary gear mechanism 64 as a speed increasing means for transmitting to the second bevel gear 57 is configured so that the second bevel gear 57 is supported by the front frame 31 via the speed increasing means (the planetary gear mechanism 64). Will be.

  Thus, the planetary gear mechanism including the speed increasing means including the internal gear 58 attached to the front frame 31, the sun gear 59 connected to the second bevel gear 57, and the planetary gear 60 connected to the vehicle body 44. If it comprises from 64, it can obtain a high reduction ratio easily, though it is small. When the planetary gear mechanism 64 (speed increasing means) is arranged behind the steering means 32 and ahead of the second bevel gear 57 as described above, a wide space is secured behind the second bevel gear 57. Thus, the degree of freedom in design can be easily improved. In the present invention, the speed increasing means may be installed behind the second bevel gear 57. Here, when the planetary gear mechanism 64 as the speed increasing means is omitted and the transmission shaft 22 is fixed to the front frame 31, the second bevel gear 57 is rotated about the rotation axis Z even if the vehicle body 44 tilts. Therefore, a constant rotational position is always maintained. In this case, when the vehicle body 44 tilts, the first bevel gear 56 rolls in the tilting direction while meshing with the second bevel gear 57, and the handle 49 and the steering shaft 53 are reversed by the three-wheeled vehicle 11. When the three-wheeled vehicle 11 tries to turn to the right when the vehicle body 44 tilts to the right and turns to the right (reverse rotation), the steering shaft 53 rotates to the left, while the vehicle body 44 tilts to the left. Thus, when the three-wheeled vehicle 11 tries to turn left, the steering shaft 53 rotates to the right, and the driving of the three-wheeled vehicle 11 becomes difficult.

  In addition, the second bevel gear 57 is installed in front of the first bevel gear 56 and the shaft attached to the second bevel gear 57 is fixed to the gear box 42 so that the second bevel gear 57 is When the vehicle body 44 (gear box 42) and the second bevel gear 57 rotate by the same angle when the vehicle body 44 tilts, when the vehicle body 44 rotates integrally with the gear box 42 around the rotation axis Z, the vehicle body 44 Even if it tilts, the steering shaft 53 does not rotate and maintains the straight traveling state, and also in this case, the driving of the three-wheeled vehicle 11 becomes difficult. However, when the second bevel gear 57 is installed in front of the first bevel gear 56 as in this embodiment, the rotation of the vehicle body 44 based on the tilting of the vehicle body 44 is accelerated to the second bevel gear 57. If speed increasing means (planetary gear mechanism 64) for transmission is provided, when the vehicle body 44 tilts (rotates), the speed increasing means moves from the rotational speed of the vehicle body 44 to the second bevel gear 57 in the same direction as the vehicle body 44. High-speed rotation is transmitted, whereby the handle 49 and the steering shaft 53 rotate so that the three-wheeled vehicle 11 travels in the same direction as the turning direction caused by the tilting of the three-wheeled vehicle 11.

  As a result, reverse rotation and non-rotation of the steering shaft 53 during the tilting of the three-wheel vehicle 11 are prevented, and the tilting of the vehicle body 44 and the rotation of the steering shaft 53 can be reliably interlocked. The turning operation can be performed smoothly and quickly. At this time, the driver rotates the handle 49 and the steering shaft 53 by the same angle in the same direction as described above. Here, the lateral link 25 of the steering means 32 is connected to the front end portion of the transmission shaft 22 via the central link 23, and the sun gear 59 of the planetary gear mechanism 64 is connected to the central portion of the transmission shaft 22. Therefore, the rotation of the steering shaft 53 is transmitted to the steering means 32 through the first bevel gear 56, the second bevel gear 57, and the transmission shaft 22. Here, the values of the gear ratio in the first and second bevel gears 56 and 57 and the speed increase ratio in the planetary gear mechanism 64 take into consideration the average traveling speed of the three-wheeled vehicle 11, the diameters of the front and rear wheels 15 and 38, and the like. You just have to decide.

  67 is a support pin that is fixed to the central link 23 directly below the transmission shaft 22 and directly below the pin 24, and extends horizontally toward the front. The upper end of the outer cylinder 68 that extends in the vertical direction is at the front end of the support pin 67. Are rotatably connected. The outer cylinder 68 has a sliding hole 69 extending upward from the lower end surface on the central axis, and a bracket whose lower end is fixed to the frame body 12 directly below the transmission shaft 22 in the sliding hole 69. An upper portion of a slide shaft 72 that is rotatably connected to 70 via a pin 71 is slidably inserted. A spring receiver 73 and a spring receiver 74 are integrally formed on the upper end portion of the outer cylinder 68 and the lower end portion of the slide shaft 72, respectively, and a compression spring 75 is interposed between the spring receivers 73 and 74. The above-described outer cylinder 68, slide shaft 72, and compression spring 75 are connected to the vehicle body 44 directly above the transmission shaft 22 (rotation axis Z) via the support pin 67, the central link 23, and the transmission shaft 22 as a whole. In addition, it constitutes an urging means 76 having a lower end connected to the front frame 31 directly below the transmission shaft 22 (rotating axis Z).

  Here, when the vehicle body 44 is in the upright state, the distance between the connection points, that is, the support pins 67 and 71, is maximum, but the vehicle body 44 is tilted from the upright state so that the distance between the support pins 67 and 71 is When the compression spring 75 decreases and the compression spring 75 is compressed, the compression spring 75 applies an urging force in the direction in which the connection points are separated from each other to the outer cylinder 68 and the slide shaft 72 so as to return to the length in the upright state. . Thus, the vehicle body 44 is assisted by the urging means 76 to return from the tilting, and can easily return to the upright state. However, the urging means 76 can be installed in a narrow space without any problem. 79 is a vehicle body cover that is attached to the vehicle body 44 and covers the vehicle body 44. The vehicle body cover 79 is seated by the driver, and is installed in front of the seat 80 in which a fuel tank (not shown) is stored. The front cover 81 and a rear fender 82 installed behind the seat 80 are provided.

Next, the operation of the first embodiment will be described.
Assume that the three-wheeled vehicle 11 is traveling straight ahead. At this time, the vehicle body 44 is maintained upright with respect to the ground S, the handle 49 extends in the left-right direction, and the front wheel 15 faces forward. In this state, when the three-wheeled vehicle 11 turns, for example, turns right, the driver moves the center of gravity to the right and tilts the vehicle body 44 to the right. At this time, the vehicle body 44 (gear box 42) The steering shaft 53 rotates clockwise about the rotation axis Z when viewed from the rear. The rotation of the gear box 42 causes the planetary gear 60 to rotate and revolve around the sun gear 59, whereby the rotation of the gear box 42 is transmitted to the sun gear 59 while being accelerated, and the sun gear 59 is transmitted to the transmission shaft 22. The second bevel gear 57 is rotated in the same direction (clockwise) as the gear box 42 at a higher speed than the rotation speed of the gear box 42. As a result, the first bevel gear 56 meshed with the second bevel gear 57 and the steering shaft 53 and the handle 49 connected to the first bevel gear 56 rotate clockwise as viewed from above. The rotation direction and the rotation amount (cutting angle) of the steering shaft 53 and the handle 49 are the same as the rotation direction and rotation amount operated by the driver, so that the tilt of the vehicle body 44 and the rotation of the steering shaft 53 are interlocked. The

  As a result, the tilting of the vehicle body 44 at the time of turning, the rotational feeling of the steering wheel 49, and the steering shaft 53 become close to those of a two-wheeled vehicle, and driving at the time of turning becomes easy. Here, as described above, the first bevel gear 56 is fixed to the lower end portion of the steering shaft 53, and the second bevel gear 57 is supported by the front frame 31, and the first bevel gear 56 and the second bevel gear 57 are If the tilting of the vehicle body 44 and the rotation of the steering shaft 53 are interlocked with each other, some dust enters between the first and second bevel gears 56 and 57 while the three-wheeled vehicle 11 is traveling. However, since both the bevel gears mesh with each other only partly, they are hardly affected by the dust. In addition, the strength of the bevel gear is significantly higher than that of the wire, so it can withstand long-term use, which makes it possible to accurately operate the interlocking operation between the tilting of the vehicle body 44 and the rotation of the steering shaft 53 for a long period of time. And it can be done reliably.

  On the other hand, the rotation of the transmission shaft 22 is transmitted to the central link 23. At this time, the central link 23 swings to the right (rotates clockwise) about the rotation axis Z, so the side link 20 While maintaining a parallel relationship with the central link 23 around the center 19, the rocker is synchronously swung to the right by the same angle. As a result, the pins 29 located at the lower end portions of the side links 20 move to the left side, but the movement of these pins 29 is transmitted to the knuckle 13 through the tie rod 30, so that the knuckle 13 is centered around the king pin 14. Swinging around, the front wheel 15 is steered so that the three-wheeled vehicle 11 turns right. The steering angle of the front wheel 15 at this time is an angle corresponding to the amount of rotation of the steering shaft 53 and the handle 49. Note that when the three-wheeled vehicle 11 turns to the left, the direction is opposite to that described above, but the operation is almost the same.

  Next, when the three-wheeled vehicle 11 is returned from the above-mentioned right turn to the straight drive, the driver returns the center of gravity to the center, and the vehicle body 44 is returned from the tilted state to the upright state. At this time, the vehicle body 44 (gear box 42) and the steering shaft 53 rotate counterclockwise around the rotation axis Z. The rotation of the gear box 42 is accelerated by the planetary gear mechanism 64, while the transmission shaft 22, The transmission shaft 22 and the second bevel gear 57 are rotated counterclockwise at a higher speed than the rotation speed of the gear box 42. As a result, the steering shaft 53 and the handle 49 rotate counterclockwise, the steering shaft 53 returns to the rotational position during linear travel, and the handle 49 returns to the state of extending in the left-right direction. On the other hand, the rotation of the transmission shaft 22 is transmitted to the central link 23 and the side link 20, and the central link 23 and the side link 20 are swung so as to extend in the vertical direction. As a result, the knuckle 13 swings counterclockwise, and the front wheel 15 is steered to face forward. Further, at the time of return as described above, the external force in the direction of increasing the distance between the support pin 67 and the pin 71 is applied to the central link 23 by the urging force of the compression spring 75, and the central link 23 swings to stand upright. The return operation described above is assisted by the biasing means 76.

    FIG. 5 is a diagram showing Embodiment 2 of the present invention. In this embodiment, the second bevel gear 57 is installed behind the first bevel gear 56, while the planetary gear mechanism 64 as speed increasing means is omitted. Further, the rear end portion of the first support shaft 85, to which the second bevel gear 57 is fixed and extending along the rotation axis Z, is rotatably supported on the rear wall of the gear box 42, and the front end of the first support shaft 85 is also supported. Is fixed to a connecting plate 86 housed in the gear box 42. The rear end portions of a plurality of second support shafts 88 whose front end portions are fixed to a support plate 87 fixed to the frame main body 12 immediately before the gear box 42 are fixed to the connecting plate 86, and the second support The central portion of the shaft 88 is passed through an arcuate groove 89 formed in the front wall of the gear box 42. When the second bevel gear 57 is installed behind the first bevel gear 56 in this way, the second bevel gear 57 is supported on the frame body 12 (front frame 31) by the first support shaft 85, the connecting plate 86, and the support. If the gear box 42 (the vehicle body 44) is tilted, the first bevel gear 56 meshes with the non-rotating second bevel gear 57 when the gear box 42 (vehicle body 44) is tilted. The steering shaft 53 rotates in the same manner as described above in conjunction with the tilting of the vehicle body 44. In this embodiment, the speed increasing means (the planetary gear mechanism 64) is not required, so that the structure is simple and the cost can be reduced. Further, the transmission shaft 22 whose front end is connected to the central link 23 is configured to transmit the rotation of the steering shaft 53 to the steering means 32 by fixing the rear end to the front wall of the gear box 42. .

    FIG. 6 is a diagram showing Embodiment 3 of the present invention. In this embodiment, a spur gear train is used instead of the planetary gear mechanism 64 as the speed increasing means. That is, the first support plate 91 fixed to the frame main body 12 immediately before the gear box 42 supports the cylindrical body 93 fixed to the front wall of the gear box 42 and extending forward along the rotation axis Z so as to be rotatable. The first gear 94 is fixed to the front end portion of the cylindrical body 93. Reference numeral 95 denotes a second support plate fixed to the frame body 12 in front of the first support plate 91, and a support shaft extending rearward in parallel with the rotation axis Z at the upper end portion of the second support plate 95. 96 is installed. Reference numeral 97 denotes a gear body rotatably supported by the support shaft 96. The gear body 97 has a second gear 98 having a smaller diameter than the first gear 94 and meshing with the first gear 94, and the second gear 98. And a third gear 99 provided further forward.

  The transmission shaft 22 is rotatably supported by the cylindrical body 93 and the second support plate 95, and the transmission shaft 22 has a smaller diameter than the third gear 99 and meshes with the third gear 99. Is fixed. As a result, when the gear box 42 (the vehicle body 44) rotates (tilts) about the rotation axis Z, the rotation is 2 between the first and second gears 94 and 98 and between the third and fourth gears 99 and 100. After being increased in speed, it is transmitted to the second bevel gear 57 through the transmission shaft 22, and the second bevel gear 57 is rotated in the same direction as the gear box 42 at a higher speed than the gear box 42. As a result, the steering shaft 53 rotates in a predetermined direction, and the tilting of the vehicle body 44 and the rotation of the steering shaft 53 are interlocked. Thus, if a spur gear train is used instead of the planetary gear mechanism 64, the manufacturing cost can be reduced. In the present invention, an eccentric oscillating gear mechanism may be used as the speed increasing means instead of the planetary gear mechanism 64.

    FIG. 7 is a diagram showing Embodiment 4 of the present invention. In this embodiment, a cylindrical cylindrical portion 103 that protrudes forward is integrally formed on the front wall of the gear box 42, and a circular disc portion 104 is integrally formed on the outer periphery of the cylindrical portion 103. Furthermore, the outer periphery of the disc portion 104 is brought into sliding contact with the gear case 17 so that the internal gear 58, the sun gear 59, and the planetary gear 60 of the planetary gear mechanism 64 are sealed with the disc portion 104 and the gear case 17. Like to do. As a result, the situation where dust enters the planetary gear mechanism 64 is suppressed, and the three-wheeled vehicle 11 can be operated smoothly for a long period of time. In this embodiment, the rear end portion of the carrier shaft 61 is fixed to the disc portion 104.

    In the above-described embodiment, a power unit such as an engine is installed in the three-wheeled vehicle 11 to form an automatic tricycle. However, in the present invention, a pedal is installed instead of the power unit, and rotation of the pedal is performed via a chain. It is also possible to use a tricycle that is transmitted to the rear wheel 38.

  The present invention can be applied to the industrial field of a three-wheeled vehicle having a pair of front wheels and one rear wheel in which the vehicle body can tilt.

11 ... three-wheeled vehicle 15 ... front wheel
31 ... Front frame 32 ... Steering means
38 ... Rear wheel 44 ... Body
49 ... handle 53 ... steering shaft
56 ... 1st bevel gear 57 ... 2nd bevel gear
58 ... Internal gear 59 ... Sun gear
60 ... Planetary gear 64 ... Speed increasing means
76 ... Biasing means S ... Ground Z ... Rotating shaft

Claims (5)

    A front frame that rotatably supports a pair of front wheels separated in the width direction and upright with respect to the ground S is connected to the front frame so as to be rotatable about a rotation axis Z extending in the front-rear direction. A vehicle body in which rear wheels are rotatably supported and can be tilted while rotating around the rotation axis Z; a steering shaft rotatably supported by the vehicle body and having a handle attached to an upper end; and a steering shaft Is transmitted to the pair of front wheels to steer the front wheels, a first bevel gear fixed to the lower end portion of the steering shaft, and supported by the front frame and meshed with the first bevel gear. A three-wheeled vehicle comprising a second bevel gear that interlocks the tilting of the vehicle body and the rotation of the steering shaft.     The second bevel gear is installed in front of the first bevel gear, and a speed increasing means for increasing the rotation based on the tilting of the vehicle body and transmitting the speed to the second bevel gear is provided. The three-wheeled vehicle according to claim 1, wherein the two bevel gears are supported by the front frame.     The three-wheeled vehicle according to claim 2, wherein the speed increasing means is arranged behind the steering means and ahead of the second bevel gear.     The speed increasing means is composed of a planetary gear mechanism, and connects the planetary gear of the planetary gear mechanism and the vehicle body, while connecting the sun gear of the planetary gear mechanism and the second bevel gear, The three-wheeled vehicle according to claim 2 or 3, wherein a gear is attached to the front frame.     An upper end is connected to the vehicle body directly above the rotation axis Z, and a lower end is connected to the front frame directly below the rotation axis Z, and an urging means for urging the two connection points apart from each other is provided. The three-wheeled vehicle according to any one of claims 1 to 4, wherein the urging means assists the vehicle body from returning from tilting.

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