JP2009006994A - Vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle for restraining complication of assembling work of a shaft, a front fork and an upper side bracket, even when the axis of the shaft and the axis of the front fork are not parallel. <P>SOLUTION: This motorcycle (the vehicle) 1 has a head pipe 2, a steering shaft 6 rotatably supported by the head pipe 2, the front fork 5, and an upper bracket 4 supporting the steering shaft 6 and the front fork 5. The steering shaft 6 includes an upper steering shaft 17 and a lower steering shaft 18. The upper steering shaft 17 is inserted into the upper bracket 4, and is fixed to the lower steering shaft 18. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle, and more particularly to a vehicle including a shaft and a bracket that supports the shaft.

  Conventionally, a vehicle including a bracket that supports a shaft such as a steering shaft is known (for example, see Patent Document 1). Patent Document 1 includes a steering shaft, a front fork, and an upper bracket that fixes the steering shaft and the front fork, and a motorcycle in which the central axis of the steering shaft and the central axis of the front fork cross each other instead of being parallel. (Vehicle) is disclosed. In this motorcycle, a front fork insertion hole having an inner diameter substantially equal to the outer diameter of the front fork is provided in the upper bracket, while a steering shaft insertion hole having an inner diameter larger than the outer diameter of the steering shaft is provided. The upper bracket can be fitted from above the steering shaft and the front fork that are not parallel to each other during assembly. In the motorcycle disclosed in Patent Document 1, after the upper bracket is fitted to the steering shaft and the front fork, a collar having the same inner diameter as the outer diameter of the steering shaft is inserted into the steering shaft insertion hole. On the other hand, by tightening the cap nut, the backlash of the steering shaft is eliminated.

Japanese Patent No. 3778536

  However, in the motorcycle (vehicle) disclosed in Patent Document 1, in order to eliminate rattling of the steering shaft, after inserting the steering shaft into the steering shaft insertion hole, the collar is attached to both the steering shaft insertion hole and the steering shaft. It is necessary to insert it with no gap and then tighten the cap nut against the steering shaft. For this reason, there exists a problem that the assembly operation | work with a steering shaft and a front fork, and an upper bracket becomes complicated.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to provide a shaft and a front fork, even when the central axis of the shaft and the central axis of the front fork are not parallel. It is an object of the present invention to provide a vehicle capable of preventing the assembly work with the upper bracket from becoming complicated.

Means for Solving the Problems and Effects of the Invention

  To achieve the above object, a vehicle according to one aspect of the present invention includes a head pipe, a shaft rotatably supported by the head pipe, a front fork, and an upper bracket on which the shaft and the front fork are supported. The shaft includes an upper shaft portion and a lower shaft portion, and the upper shaft portion is inserted into the upper bracket and fixed to the lower shaft portion.

  In the vehicle according to this aspect, as described above, the upper shaft portion is fixed to the lower shaft portion while being inserted into the upper bracket. Even when the front fork and the lower shaft portion are inserted into the upper bracket, the front fork and the shaft are moved upward only by inserting the upper shaft portion into the upper bracket and fixing it to the lower shaft portion. Can be attached to a bracket. Thereby, it can suppress that the assembly operation | work of a shaft, a front fork, and an upper side bracket becomes complicated.

  In the vehicle according to the above aspect, preferably, the upper bracket includes a front fork insertion hole portion into which the front fork is inserted, an upper shaft portion insertion hole portion into which the upper shaft portion of the shaft is inserted, and an upper shaft portion insertion hole. And a lower shaft portion receiving hole portion in which the lower shaft portion is received, and a predetermined gap is formed between the lower shaft portion and the lower shaft portion receiving hole portion. ing. If constituted in this way, at the time of assembly, the upper bracket can be easily fitted to the front fork and the lower shaft portion which are not parallel to each other, and thereafter, the upper shaft portion is inserted into the upper bracket, It can be fixed to the lower shaft part. Thereby, it can suppress that the assembly operation | work with a shaft, a front fork, and an upper bracket becomes complicated easily.

  In this case, preferably, the front fork insertion hole portion has an inner diameter equivalent to the outer diameter of the portion inserted into the front fork insertion hole portion of the front fork, and the upper shaft portion insertion hole portion is the upper shaft portion. It has an inner diameter equivalent to the outer diameter of the portion inserted into the upper shaft portion insertion hole. If comprised in this way, when a front fork and an upper side shaft part are attached to an upper side bracket, backlash with a front fork, an upper side shaft part, and an upper side bracket can be eliminated.

  In the vehicle in which the upper bracket includes the upper shaft portion insertion hole, preferably, a portion that is inserted into the upper shaft portion insertion hole of the upper bracket of the upper shaft portion is tapered toward the lower shaft portion. A shape portion is formed. With this configuration, the upper shaft portion can be easily inserted into the upper shaft portion insertion hole portion of the upper bracket having an inner diameter equivalent to the outer diameter of the upper shaft portion by the tapered portion of the upper shaft portion. The center axis of the upper shaft portion and the center axis of the upper shaft insertion hole can be easily aligned. Thereby, it can suppress more that the assembly operation of a shaft and an upper side bracket becomes complicated.

  In the vehicle according to the above aspect, the upper shaft portion preferably includes a first screw portion formed at a tip portion on the lower shaft portion side, and a tip portion on the upper shaft portion side of the lower shaft portion includes: A second screw portion that is screwed into the first screw portion is formed. If comprised in this way, an upper shaft part will be inserted in an upper bracket at the time of an assembly, and only an upper shaft part will be screwed together with the 1st screw part of an upper shaft part to the 2nd screw part of a lower shaft part. Since it can fix to a lower shaft in the state inserted in the upper bracket, it can suppress more that the assembly operation | work of a shaft and an upper bracket becomes complicated.

  In the vehicle according to the above aspect, the shaft and the front fork are preferably arranged non-parallel to each other so that a central axis common to the upper shaft portion and the lower shaft portion intersects with the central axis of the front fork. ing. Thus, even when the center axis of the shaft and the center axis of the front fork are arranged non-parallel to each other, if the present invention is applied, the assembly work of the shaft, the front fork and the upper bracket becomes complicated. Can be suppressed.

  The vehicle according to the above aspect preferably further includes a lower bracket that is disposed below the head pipe and supports the shaft and the front fork. With this configuration, the lower bracket can suppress the shaft from moving downward, and the front fork can be prevented from moving in the vehicle width direction. It can be supported stably.

  In this case, preferably, the lower shaft portion is supported upward by the first bearing member disposed at the upper end portion of the head pipe and the support portion of the lower bracket while being disposed at the lower end portion of the head pipe. The second bearing member is rotatably supported. If comprised in this way, while a 1st bearing member and a 2nd bearing member can make rotation of a lower shaft part smooth, a lower shaft part is made into the upper end part and lower end part of a lower shaft part, and Therefore, when the lower shaft portion rotates, the lower shaft portion can be stably supported.

  In the vehicle in which the first bearing member is disposed, preferably, a third screw portion is formed on the outer peripheral surface of the lower shaft portion, and is screwed into the third screw portion of the lower shaft portion. 1 The nut part which fixes a bearing member is further provided. If comprised in this way, the position with respect to the lower shaft part of a 1st bearing member can be hold | maintained by a nut part.

  In the vehicle including the nut portion, preferably, the upper bracket includes a lower shaft portion storage hole portion in which the lower shaft portion is stored, and is between the upper surface of the nut portion and the upper surface of the lower shaft portion storage hole portion. And further comprising a collar portion disposed on the surface. If comprised in this way, the height position of an upper side bracket can be adjusted easily.

  In the vehicle in which the upper bracket includes a front fork insertion hole portion, preferably, a pair of front forks is provided, and the upper portions of the pair of front forks are located in the vicinity of both ends of the upper bracket in the vehicle width direction. It is fixed by being inserted into each fork insertion hole. If comprised in this way, a vehicle can be stabilized more compared with the case where one front fork is provided. Further, since the pair of front forks are fixed to both ends with respect to the rotation axis of the upper bracket, the pair of front forks can be rotated more efficiently when the upper bracket is rotated.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing the overall configuration of a motorcycle according to an embodiment of the present invention. FIG. 2 is a front view showing the overall configuration of the motorcycle according to the embodiment of the present invention. 3 to 9 are views for explaining the structure of the motorcycle according to the embodiment shown in FIG. In the present embodiment, a motorcycle will be described as an example of the vehicle of the present invention. In the figure, the arrow FWD direction indicates the front in the traveling direction of the motorcycle. Hereinafter, with reference to FIGS. 1-9, the structure of the motorcycle 1 by one Embodiment of this invention is demonstrated.

  As the entire structure of the motorcycle 1 according to the embodiment of the present invention, a main frame 3a is connected to the rear portion of the head pipe 2 as shown in FIG. A down tube 3b is connected to the lower part of the head pipe 2 so as to extend downward and rearward. The head pipe 2, the main frame 3a, and the down tube 3b constitute a vehicle body frame.

  Further, as shown in FIGS. 1, 2, and 5, an upper bracket 4 that is rotatable with respect to the head pipe 2 is disposed above the head pipe 2. As shown in FIG. 2, a pair of front forks 5, a steering shaft 6, and a pair of handle stays 8 for attaching the handle 7 are fixed to the upper bracket 4. The upper bracket 4 is an example of the “upper bracket” in the present invention, and the steering shaft 6 is an example of the “shaft” in the present invention.

  As shown in FIGS. 3 and 4, the handle stay 8 is attached to the upper surface of the upper bracket 4 so as to protrude upward. Specifically, as shown in FIG. 4, support shaft portions 8 c each having a screw portion 8 b at the lower end portion are provided at the lower portions of the main body portions 8 a of the pair of handle stays 8. Further, as shown in FIGS. 4 and 8, a pair of handle stay mounting holes 4 a are formed in the upper bracket 4 so as to penetrate between the upper surface and the lower surface of the upper bracket 4. Also, as shown in FIG. 4, bushes 9 formed by shock absorbers 9a whose outer peripheral surfaces can absorb shocks are fitted into the inner surfaces of the pair of handle stay mounting holes 4a. In addition, a damper 10 and a washer 11 capable of attenuating fine vibrations generated during traveling are disposed at the upper part of each bush 9, and each washer 11 has a main body portion 8 a of a pair of handle stays 8. The lower surface of the is supported. Further, a nut 13 is attached to the screw portion 8b via a washer 12.

  As shown in FIG. 3, a handle pipe 7 a extending in the vehicle width direction (arrow X <b> 1 direction and arrow X <b> 2 direction) is provided at the upper part of the body portion 8 a of the pair of handle stays 8. The stay cover 14 is fixed so as to be sandwiched between the two. Specifically, four screw insertion holes 14a are formed in the upper portion of the stay cover 14, and two screw holes 8d are formed in the pair of handle stays 8 as shown in FIG. ing. The stay cover 14 is attached to the pair of handle stays 8 by being screwed into the screw holes 8d of the handle stay 8 in a state where the screw members 15 are inserted into the screw insertion holes 14a of the stay cover 14. . Thereby, when the handle pipe 7a is rotated, the upper bracket 4 can be rotated via the pair of handle stays 8.

  Further, as shown in FIGS. 2 and 3, front fork insertion holes 4b are formed in the vicinity of both ends of the upper bracket 4 in the vehicle width direction (arrow X1 direction and arrow X2 direction). The front fork insertion hole 4b is an example of the “front fork insertion hole” in the present invention. As shown in FIG. 2, the front fork 5 is inserted into a pair of front fork insertion holes 4b, and is fixed to the upper bracket 4 in the vicinity of the upper end portion. The front fork 5 is an outer tube arranged on the upper side (the handle 7 side) and an outer tube arranged on the lower side (the front wheel 16 side described later) and slidable on the outer periphery of the inner tube 5a. Tube 5b. The inner tube 5a has an outer diameter equivalent to the inner diameter of the front fork insertion hole 4b. Further, as shown in FIGS. 1 and 2, a front wheel 16 is rotatably attached to the lower portion of the outer tube 5b.

  Here, in the present embodiment, the steering shaft 6 is configured such that the upper steering shaft 17 and the lower steering shaft 18 can be separated as shown in FIGS. 6 and 7. Specifically, the upper steering shaft 17 includes a head portion 17a having a hexagonal shape, a tapered shape portion 17b having a tapered shape, and a screw portion 17c so that the upper steering shaft 17 can be easily assembled by a tool such as a spanner. As shown in FIG. 6, the lower steering shaft 18 includes a screw hole portion 18a that is screwed by a screw portion 17c of the upper steering shaft 17, and a screw hole portion that fixes the lower steering shaft 18 to an under bracket 20 described later. 18b. The upper steering shaft 17 is an example of the “upper shaft portion” in the present invention, and the screw portion 17c is an example of the “first screw portion” in the present invention. The lower steering shaft 18 is an example of the “lower shaft portion” in the present invention, and the screw hole portion 18a is an example of the “second screw portion” in the present invention.

  In the present embodiment, as shown in FIG. 5, the center axis L1 of the front fork 5 and the center axis L2 of the steering shaft 6 are not parallel to each other but intersect at an angle α (α = about 6 °). It is configured.

  Further, as shown in FIG. 8, between the inner peripheral surface of the pair of front fork insertion holes 4b of the upper bracket 4 and the rear side surface of the upper bracket 4 (surface opposite to the arrow FWD direction), A slit portion 4c is formed. A screw hole 4d is formed on one surface of the slit 4c, and a screw insertion hole 4e is formed on the other surface. Further, the screw holes 4d are inserted with the upper ends of the inner tubes 5a (see FIG. 2) of the pair of front forks 5 (see FIG. 2) inserted into the pair of front fork insertion holes 4b. The screw member 19 inserted from the hole 4e is screwed. That is, the pair of front fork insertion holes 4b can reduce the inner diameter of the pair of front fork insertion holes 4b by tightening the screw member 19 to reduce the interval between the slit portions 4c. It is configured. As a result, the pair of front forks 5 can be firmly fixed to the upper bracket 4.

  Here, in the present embodiment, as shown in FIG. 8, the upper steering shaft 17 is inserted on the upper surface side of the substantially central portion of the upper bracket 4 in the vehicle width direction (arrow X1 direction and arrow X2 direction). An upper steering shaft insertion hole 4f is formed. 6 and 7, the lower steering shaft 18 is in direct contact with the lower surface side of the substantially central portion of the upper bracket 4 in the vehicle width direction (arrow X1 direction and arrow X2 direction). A lower steering shaft storage hole 4g is formed to be stored without any problem. Specifically, the inner diameter of the upper steering shaft insertion hole 4f is equal to the outer diameter of the portion where the upper steering shaft 17 contacts the upper steering shaft insertion hole 4f, and the upper steering shaft insertion hole 4f accommodates the lower steering shaft. It communicates with the hole 4g. Further, the inner diameter of the lower steering shaft housing hole 4g is formed to be larger than the outer diameter of the portion where the lower steering shaft 18 is housed in the lower steering shaft housing hole 4g. That is, as shown in FIG. 7, a predetermined gap D is formed between the outer peripheral surface of the lower steering shaft 18 and the inner peripheral surface of the lower steering shaft housing hole 4g. The upper steering shaft insertion hole 4f is an example of the “upper shaft part insertion hole” in the present invention, and the lower steering shaft storage hole 4g is an example of the “lower shaft part storage hole” in the present invention. .

  As shown in FIGS. 6 and 7, a washer 21 is disposed between the lower surface of the head 17 a of the upper steering shaft 17 and the upper surface of the upper bracket 4. Further, the upper steering shaft 17 is configured to be fixed to the lower steering shaft 18 while being inserted into the upper bracket 4.

  As shown in FIGS. 2 and 6, an under bracket 20 that is rotatable with respect to the head pipe 2 is disposed below the head pipe 2. The under bracket 20 is an example of the “lower bracket” in the present invention. The under bracket 20 has a function of supporting the head pipe 2 upward at a substantially central portion of the under bracket 20 in the vehicle width direction (arrow X1 direction and arrow X2 direction in FIG. 2).

  As shown in FIGS. 2 and 9, a pair of front fork insertion holes 20a are formed in the vicinity of both ends of the under bracket 20 in the vehicle width direction (arrow X1 direction and arrow X2 direction). The inner tubes 5a of the pair of front forks 5 are respectively fixed by the pair of front fork insertion holes 20a. Thus, the upper end portion of the front fork 5 is supported by the upper bracket 4 and the intermediate portion of the front fork 5 is supported by the under bracket 20. As a result, since the front fork 5 is supported at two points, the front fork 5 can be stably supported. Further, as shown in FIGS. 6 and 9, a lower steering shaft insertion hole 20b is provided in a substantially central portion of the under bracket 20 in the vehicle width direction (arrow X1 direction and arrow X2 direction in FIG. 9). ing. Further, as shown in FIG. 6, the lower steering shaft 18 is screwed into the screw hole portion 18 b of the lower steering shaft 18 through the guide plate 22 attached to the lower surface portion 20 c of the under bracket 20. Thus, it is fixed to the under bracket 20.

  Further, as shown in FIG. 9, a slit portion 20d is provided between the inner peripheral surface of the pair of front fork insertion holes 20a and the rear side surface of the under bracket 20 (the surface opposite to the arrow FWD direction). Is formed. A screw hole portion 20e is formed on one surface of the slit portions 20d, and a screw insertion hole 20f is formed on the other surface. The screw members 24 inserted from the screw insertion holes 20f are screwed into the screw hole portions 20e in a state where the pair of front forks 5 (see FIG. 2) are inserted into the pair of front fork insertion holes 20a. ing. That is, each of the pair of front fork insertion holes 20a can reduce the inner diameter of the pair of front fork insertion holes 20a by reducing the interval between the slit portions 20d by tightening the screw member 24. It is configured. As a result, the pair of front forks 5 can be firmly fixed to the under bracket 20. As shown in FIG. 2, the inner tubes 5a of the pair of front forks 5 are inserted into the pair of front fork insertion holes 20a, respectively. Further, the inner tube 5 a is fixed at a predetermined position where the highest point when the outer tube 5 b moves upward does not contact the lower surface portion 20 c of the under bracket 20.

  In the present embodiment, as shown in FIGS. 5 and 6, a taper bearing 25 is fitted into the upper end portion of the head pipe 2, and a taper bearing 26 is fitted into the lower end portion of the head pipe 2. It is. The tapered bearing 25 is an example of the “first bearing member” in the present invention, and the tapered bearing 26 is an example of the “second bearing member” in the present invention. As shown in FIG. 9, a substantially flat support portion 20h is provided on the upper surface portion 20g of the under bracket 20, and as shown in FIG. 6, the taper bearing 26 is moved upward by the support portion 20h. It is arranged to be supported in the direction. Further, since the outer peripheral surface of the lower steering shaft 18 is inserted so as to contact the inner peripheral surfaces of the taper bearing 25 and the taper bearing 26, the lower steering shaft 18 can be rotated by the taper bearing 25 and the taper bearing 26. Is arranged.

  Here, in this embodiment, as shown in FIGS. 6 and 7, a screw portion 18 c is formed on the outer surface on the upper side of the lower steering shaft 18. A nut 27 is screwed into the screw portion 18 c, and the nut 27 is disposed on the upper surface of the tapered bearing 25. Further, as shown in FIG. 7, a washer 28 is disposed on the upper surface portion 27 a of the nut 27. Further, a nut 29 is disposed on the upper surface portion of the washer 28, and the nut 29 is screwed to the screw portion 18 c of the lower steering shaft 18. A spacer 30 having a plurality of leg portions 30 a is disposed on the upper surface portion 29 a of the nut 29. The plurality of leg portions 30 a are formed so as to contact the side surfaces of the nut 27, the washer 28, and the nut 29. These nut 27, washer 28, nut 29, and spacer 30 can hold the position of the tapered bearing 25 with respect to the lower steering shaft 18. The screw portion 18c is an example of the “third screw portion” in the present invention. The nut 29 is an example of the “nut portion” in the present invention, and the upper surface portion 29a is an example of the “upper surface of the nut portion” in the present invention.

  In the present embodiment, as shown in FIG. 6, the lower steering shaft 18 is supported by the nut 27 and supported upward by the tapered bearing 25 and the support portion 20 h of the under bracket 20. By the taper bearing 26, it arrange | positions so that it may be supported by two points | pieces with which the upper end part and the lower end part were separated. Further, as shown in FIG. 7, a collar 31 is disposed between the upper surface of the spacer 30 and the upper surface portion 4 h of the lower steering shaft storage hole 4 g of the upper bracket 4. The collar 31 is an example of the “collar portion” in the present invention, and the upper surface portion 4h is an example of the “upper surface of the lower steering shaft storage hole portion” in the present invention.

  Further, as shown in FIG. 2, the upper bracket 4 is provided with a pair of headlight stays 33 for holding the headlight 32. As shown in FIG. 5, the headlight stay 33 is fixed to the lower surface 4 i of the upper bracket 4, and the headlight stay 33 is configured to rotate in the direction in which the upper bracket 4 is rotated. Yes.

  Further, as shown in FIG. 2, blinking lamps 34 are respectively disposed above the pair of front fork insertion holes 20 a of the under bracket 20. These blinking lamps 34 are respectively attached to the inner tubes 5a of the pair of front forks 5 via brackets 34a.

  Further, as shown in FIG. 1, a main power source 35 of the motorcycle 1 is provided at the front portion (the arrow FWD direction side portion) of the upper bracket 4. The main power supply unit 35 is configured to protrude forward (in the direction of arrow FWD). In addition, an insertion port 35a (see FIG. 5) into which a key (not shown) is inserted is provided at the upper part of the main power supply unit 35.

  A pivot shaft 36 is provided at the lower part of the main frame 3a. By this pivot shaft 36, the front end portion of the rear arm 37 is pivotally supported so as to swing up and down. A rear wheel 38 is rotatably attached to the rear end portion of the rear arm 37. A rear fender 39 is disposed above the rear wheel 38, and a pair of flashing lamps 40 are attached to the rear part of the rear fender 39.

  An engine 41 is arranged on the main frame 3a. The engine 41 is an air-cooled engine, and includes a crankcase portion 41a, a cylinder block portion 41b, a cylinder head portion 41c, and a cylinder head cover portion 41d. A fuel tank 42 is disposed above the engine 41. A seat 43 is provided behind the fuel tank 42.

  10 and 11 are views for explaining a procedure for assembling the front fork, the steering shaft, and the upper bracket to the vehicle according to the embodiment of the present invention. Next, a procedure for assembling the front fork 5, the steering shaft 6 and the upper bracket 4 to the motorcycle 1 according to one embodiment of the present invention will be described with reference to FIGS.

  First, as shown in FIG. 10, with the front fork 5 and the lower steering shaft 18 fixed to the under bracket 20, the lower steering shaft 18 is attached to the head pipe 2 fixed to the main frame 3a. Specifically, the lower steering shaft 18 is attached to the head pipe 2 so that the outer peripheral surface of the lower steering shaft 18 contacts both inner peripheral surfaces of the taper bearing 25 and the taper bearing 26 fitted in the head pipe 2. . Next, as shown in FIG. 11, in order to fix the lower steering shaft 18 attached to the head pipe 2, a nut 27 is screwed into the screw portion 18 c of the lower steering shaft 18. The washer 28 is disposed on the upper surface portion 27 a of the nut 27, and the nut 29 is screwed to the screw portion 18 c of the lower steering shaft 18 so as to contact the upper surface of the washer 28. Further, the spacers 30 are arranged on the upper surface portion 29 a of the nut 29 and the side surfaces of the nut 27, the washer 28 and the nut 29. A collar 31 is disposed on the upper surface of the spacer 30.

  Next, the upper bracket 4 is disposed from above the head pipe 2. Specifically, the upper bracket 4 is arranged so that the front fork 5 is inserted into the front fork insertion hole 4 b of the upper bracket 4. Then, when the upper bracket 4 is pushed into the front fork 5, the upper bracket 4 is arranged so that the upper surface of the collar 31 comes into contact with the upper surface portion 4h of the lower steering shaft housing hole 4g of the upper bracket 4. Here, even when the center axis L1 of the front fork 5 and the center axis L2 of the lower steering shaft 18 that are not parallel to each other are fixed in advance, the outer peripheral surface of the lower steering shaft 18 and the inner peripheral surface of the lower steering shaft storage hole 4g A predetermined gap D is formed between the two.

  Then, the washer 21 is disposed on the upper surface of the upper steering shaft insertion hole 4f of the upper bracket 4. Next, the upper steering shaft 17 is inserted into the upper steering shaft insertion hole 4 f of the upper bracket 4 so that the upper surface of the washer 21 and the lower surface of the head portion 17 a of the upper steering shaft 17 are in contact with each other. Then, the screw portion 17c of the upper steering shaft 17 is screwed into and fixed to the screw hole portion 18a of the lower steering shaft 18 by rotating the head portion 17a using a predetermined tool. Thereby, as shown in FIG. 5, the front fork 5, the steering shaft 6, and the upper bracket 4 are assembled to the motorcycle 1.

  In the present embodiment, as described above, the upper steering shaft 17 is configured to be fixed to the lower steering shaft 18 while being inserted into the upper bracket 4, so that the center axis L 1 of the front fork 5 and the steering shaft 6 are fixed. Even when the central axis L2 is not parallel, only the operation of inserting the upper steering shaft 17 into the upper bracket 4 and fixing it to the lower steering shaft 18 with the front fork 5 and the lower steering shaft 18 inserted into the upper bracket 4 Thus, the front fork 5 and the steering shaft 6 can be attached to the upper bracket 4. As a result, the assembly work of the front fork 5 and the steering shaft 6 and the upper bracket 4 can be prevented from becoming complicated.

  Further, in the present embodiment, as described above, the gap D is formed between the outer peripheral surface of the lower steering shaft 18 and the inner peripheral surface of the lower steering shaft storage hole 4g, so that the fronts that are not parallel to each other are assembled. The upper bracket 4 can be easily fitted into the fork 5 and the lower steering shaft 18, and thereafter, the upper steering shaft 17 can be inserted into the upper bracket 4 and fixed to the lower steering shaft 18. . As a result, it is possible to easily prevent the assembly work of the front fork 5 and the steering shaft 6 and the upper bracket 4 from becoming complicated.

  In the present embodiment, as described above, the front fork insertion hole 4b is configured to have an inner diameter equivalent to the outer diameter of the inner tube 5a of the front fork 5, and the upper steering shaft insertion hole 4f is When the upper bracket 4 is attached to the front fork 5 and the upper steering shaft 17 by having an inner diameter equivalent to the outer diameter of the portion inserted into the upper steering shaft insertion hole 4f of the steering shaft 17, the front The backlash between the fork 5 and the upper steering shaft 17 and the upper bracket 4 can be eliminated.

  Further, in the present embodiment, as described above, the tapered portion 17b that becomes thinner toward the lower steering shaft 18 is formed in the portion of the upper steering shaft 17 that is inserted into the upper steering shaft insertion hole 4f of the upper bracket 4. By doing so, the upper steering shaft 17 can be easily inserted into the upper steering shaft insertion hole 4f, and the central axis of the upper steering shaft 17 and the central axis of the upper steering shaft insertion hole 4f can be easily matched. . As a result, it is possible to further prevent the assembly work of the steering shaft 6 and the upper bracket 4 from becoming complicated.

  In the present embodiment, as described above, the lower steering shaft 18 is provided with the screw hole portion 18a that is screwed into the screw portion 17c of the upper steering shaft 17, so that the upper steering shaft 17 is attached to the upper bracket during assembly. 4 is inserted into the upper steering shaft insertion hole 4f, and the upper steering shaft 17 is inserted into the upper bracket 4 simply by screwing the screw portion 17c of the upper steering shaft 17 into the screw hole portion 18a of the lower steering shaft 18. Can be fixed to the lower steering shaft 18. As a result, it is possible to further prevent the assembly work of the steering shaft 6 and the upper bracket 4 from becoming complicated.

  In the present embodiment, as described above, the under bracket 20 is provided below the head pipe 2 and supports the steering shaft 6 and the front fork 5. Can be prevented from moving downward, and the front fork 5 can be prevented from moving in the vehicle width direction, so that the steering shaft 6 and the front fork 5 can be stably supported.

  In the present embodiment, as described above, the lower steering shaft 18 is disposed at the upper end portion of the head pipe 2 and the tapered bearing 25 disposed at the lower end portion of the head pipe 2 and supports the under bracket 20. The lower steering shaft 18 can be smoothly rotated and supported at the upper end of the lower steering shaft 18 by being rotatably supported by the taper bearing 26 supported upward by the portion 20h. Therefore, when the lower steering shaft 18 is rotated, the lower steering shaft 18 can be stably supported.

  In the present embodiment, as described above, the screw portion 18 c is formed on the outer peripheral surface of the lower steering shaft 18, and is screwed into the screw portion 18 c of the lower steering shaft 18, and the nut 27 that fixes the taper bearing 25. Thus, the position of the tapered bearing 25 relative to the lower steering shaft 18 can be held by the nut 27.

  In the present embodiment, as described above, the collar 31 is provided between the upper surface portion 29a of the nut 29 and the upper surface portion 4h of the lower steering shaft housing hole 4g of the upper bracket 4, so that the upper bracket 4 can be easily formed. The height position of can be adjusted.

  In the present embodiment, as described above, the upper portions of the pair of front forks 5 are fixed by being inserted into the front fork insertion holes 4b of the upper bracket 4 in the vicinity of both ends of the upper bracket 4 in the vehicle width direction. As a result, the motorcycle 1 can be made more stable as compared with the case where one front fork 5 is provided. Further, since the pair of front forks 5 are fixed to both ends with respect to the rotation axis of the upper bracket 4, the pair of front forks 5 can be rotated more efficiently when the upper bracket 4 is rotated.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above-described embodiment, an example in which the present invention is applied to a motorcycle has been shown. However, the present invention is not limited thereto, and a bicycle, a tricycle, a vehicle including a front fork and a bracket that supports the front fork may be used. The present invention can also be applied to other vehicles such as ATV (All Terrain Vehicle).

  In the above embodiment, an example is shown in which the angle formed by the center axis of the front fork and the center axis of the steering shaft is about 6 °. However, the present invention is not limited to this, and the front fork You may comprise so that the angle which a center axis line and the center axis line of a steering shaft make may form an angle different from about 6 degrees.

  In the above embodiment, an example is shown in which the upper steering shaft is provided with the screw portion and the lower steering shaft is provided with the screw hole portion. However, the present invention is not limited thereto, and the lower steering shaft is provided with the screw portion. A screw hole may be provided in the upper steering shaft.

1 is a side view showing an overall configuration of a motorcycle according to an embodiment of the present invention. 1 is a front view showing an overall configuration of a motorcycle according to an embodiment of the present invention. FIG. 2 is a plan view showing a structure around a handle of the motorcycle according to the embodiment shown in FIG. 1. FIG. 2 is a partial cross-sectional view showing a structure around a handle of the motorcycle according to the embodiment shown in FIG. 1. FIG. 2 is a partial cross-sectional view showing a front fork and a steering shaft of the motorcycle according to the embodiment shown in FIG. 1. FIG. 2 is a partial sectional view showing a structure of a steering shaft of the motorcycle according to the embodiment shown in FIG. 1. FIG. 7 is an enlarged partial sectional view of a structure of an upper portion of a steering shaft of the motorcycle according to the embodiment shown in FIG. 6. FIG. 2 is a plan view showing a structure of an upper bracket of the motorcycle according to the embodiment shown in FIG. 1. Fig. 2 is a plan view showing a structure of an under bracket of the motorcycle according to the embodiment shown in Fig. 1. FIG. 6 is a diagram for explaining an assembly procedure of a front fork, a steering shaft, and a head pipe of a motorcycle according to an embodiment of the present invention. FIG. 5 is a view for explaining an assembly procedure of the front fork, the steering shaft, and the upper bracket of the motorcycle according to the embodiment of the present invention.

Explanation of symbols

1 Motorcycle (vehicle)
2 Head pipe 4 Upper bracket (upper bracket)
4b Front fork insertion hole (front fork insertion hole)
4f Upper steering shaft insertion hole (upper shaft insertion hole)
4g Lower steering shaft storage hole (lower shaft storage hole)
4h Top surface (upper surface of lower shaft housing hole)
5 Front fork 6 Steering shaft (shaft)
17 Upper steering shaft (upper shaft)
17b Tapered part 17c Screw part (first screw part)
18 Lower steering shaft (lower shaft)
18a Screw hole (second screw part)
18c Screw part (third screw part)
20 Under bracket (lower bracket)
20h Support portion 25 Tapered bearing (first bearing member)
26 Tapered bearing (second bearing member)
29 Nut (Nut part)
29a Top surface (upper surface of nut)
31 colors (color part)
D Clearance L1 Center axis of front fork L2 Center axis of steering shaft (center axis of shaft)

Claims (11)

A head pipe,
A shaft rotatably supported by the head pipe;
A front fork,
An upper bracket on which the shaft and the front fork are supported;
The shaft includes an upper shaft portion and a lower shaft portion,
The upper shaft portion is a vehicle inserted into the upper bracket and fixed to the lower shaft portion. The upper bracket communicates with a front fork insertion hole portion into which the front fork is inserted, an upper shaft portion insertion hole portion into which the upper shaft portion of the shaft is inserted, and the upper shaft portion insertion hole portion. Including a lower shaft portion accommodating hole in which the lower shaft portion is accommodated,
The vehicle according to claim 1, wherein a predetermined gap is formed between the lower shaft portion and the lower shaft portion accommodation hole portion. The front fork insertion hole has an inner diameter equivalent to an outer diameter of a portion inserted into the front fork insertion hole of the front fork,
The vehicle according to claim 2, wherein the upper shaft portion insertion hole has an inner diameter equivalent to an outer diameter of a portion of the upper shaft portion that is inserted into the upper shaft portion insertion hole.   3. The vehicle according to claim 2, wherein a taper-shaped portion that becomes thinner toward the lower shaft portion side is formed in a portion that is inserted into the upper shaft insertion hole portion of the upper bracket of the upper shaft portion. . The upper shaft portion includes a first screw portion formed at a tip portion on the lower shaft portion side,
The vehicle according to claim 1, wherein a second screw portion that is screwed into the first screw portion is formed at a tip portion of the lower shaft portion on the upper shaft portion side.   The shaft and the front fork are arranged non-parallel to each other so that a central axis common to the upper shaft portion and the lower shaft portion intersects a central axis of the front fork. Vehicle described in.   The vehicle according to claim 1, further comprising a lower bracket that is disposed below the head pipe and supports the shaft and the front fork.   The lower shaft portion is disposed at the first bearing member disposed at the upper end portion of the head pipe and the lower end portion of the head pipe, and is supported upward by the support portion of the lower bracket. The vehicle according to claim 7, which is rotatably supported by the second bearing member. A third screw portion is formed on the outer peripheral surface of the lower shaft portion,
The vehicle according to claim 8, further comprising a nut portion that is screwed into a third screw portion of the lower shaft portion and fixes the first bearing member. The upper bracket includes a lower shaft portion accommodation hole portion in which the lower shaft portion is accommodated,
The vehicle according to claim 9, further comprising a collar portion disposed between an upper surface of the nut portion and an upper surface of the lower shaft portion housing hole portion. A pair of the front forks are provided,
The vehicle according to claim 2, wherein upper portions of the pair of front forks are fixed by being inserted into front fork insertion holes of the upper bracket in the vicinity of both ends of the upper bracket in the vehicle width direction.

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