JP2005280481A - Vehicle body frame structure for irregular ground traveling vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance installation accuracy of a suspension arm support part and a steering shaft support part in a vehicle body frame and to reduce a man-day of assembling of the vehicle body frame in a vehicle body frame structure for an irregular ground traveling vehicle. <P>SOLUTION: The vehicle body frame 15 is made to a two-divided structure comprising a lower frame 142 including arm support parts 72, 73, 74, 76, 77 for supporting to be vertically swingable a suspension arm (left upper arm, left lower arm, right upper arm and right lower arm) and shaft support parts 85, 88 for supporting a steering shaft; and an upper frame 141 other than that. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle body frame structure for a rough terrain vehicle such as a buggy.

As a body frame structure of a conventional rough terrain vehicle, a structure in which the body frame is divided into two parts is known (for example, see Patent Document 1).
JP 63-170176 A

FIG. 2 of Patent Document 1 will be described with reference to FIG. In addition, the code | symbol was reassigned.
FIG. 8 is a perspective view showing a body frame structure of a conventional rough terrain vehicle. The body frame 201 includes an upper body frame 202, a lower body frame 203 coupled to a lower portion of the upper body frame 202, and upper portions thereof. It consists of cushion brackets 204 (only one side is shown) coupled to the front parts of the body frame 202 and the lower body frame 203.

  The upper body frame 202 includes a main frame 206, a pair of left and right center frames 207 and 208 integrally formed with the main frame 206, a down tube 211 extending obliquely forward and downward from the front end of the main frame 206, and the down tube 211. The front member 212 extends downward from the front portion of the rear tube 211 and the back stay 213 extends obliquely rearward and downward from the rear portion of the down tube 211.

The lower body frame 203 includes a pair of left and right left bottom frames 215 and right bottom frames 216, and cross members 217 and 218 that are respectively passed to the rear portions of the left bottom frame 215 and the right bottom frame 216.
The cushion bracket 204 is formed by connecting the lower body frame 203 to the down tube 211 and the front member 212 to form a front body frame structure 221, which is in contact with both side surfaces of the front body frame structure 221, It is the member which welded.

  The vehicle body frame 201 is roughly divided into an upper vehicle body frame 202 and a lower vehicle body frame 203, but a cushion bracket 204 for attaching the left and right suspension arms includes an upper vehicle body frame 202 and a lower vehicle body frame 203. Depending on the size of the down tube 211 and the front member 212 on the upper body frame 202 side and the size of the left bottom frame 215 and the right bottom frame 216 on the lower body frame 203 side. It is also possible that the attachment accuracy cannot be secured.

  As shown in FIG. 3 of the publication, the cushion bracket 204 is a member to which the suspension arm is attached. Therefore, high assembly accuracy is required so as not to affect the wheel alignment of the front wheels.

  Although not shown, a steering shaft for steering the front wheels is generally supported at two upper and lower portions of the body frame. For example, when the support portion of the steering shaft is provided on each of the upper body frame 202 side and the lower body frame 203 side in the drawing, the support portions are not on the same frame side. It becomes difficult to increase. The assembly accuracy of the steering shaft is related to the steering force of the steering wheel, the rudder angle of the front wheels, etc., and an improvement in the assembly accuracy is required.

  Further, since the cushion bracket 204 is attached to the upper body frame 202 and the lower body frame 203, the number of assembling steps is increased as compared to simply connecting the upper body frame 202 and the lower body frame 203.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve the assembly structure of the suspension arm support portion and the steering shaft support portion in the vehicle body frame by improving the vehicle body frame structure of the rough terrain vehicle, and to reduce the assembly time of the vehicle body frame. There is.

  According to the first aspect of the present invention, arm support portions are provided at the front left and right of the vehicle body frame, the suspension arms are supported by the arm support portions so as to be swingable up and down, and front wheels are disposed on the front end sides of the suspension arms. In a rough terrain vehicle provided with a shaft support portion for supporting a steering shaft at the front portion of the vehicle body frame for steering these front wheels, the first frame assembly including the vehicle body frame, the arm support portion and the shaft support portion. And a second frame assembly other than the second frame assembly.

  Since the vehicle body frame is composed of the first frame assembly including the arm support portion and the shaft support portion and the other second frame assembly, the arm support portion and the shaft support portion that require assembly accuracy are the first. The frame assembly and the second frame assembly are not separated, and the assembly accuracy of the arm support portion and the shaft support portion is improved. Further, since only the first frame assembly and the second assembly are assembled, the number of assembling steps can be reduced as compared with the conventional assembly of the divided frame assemblies.

The invention according to claim 2 is characterized in that at least one closed loop is formed in the first frame assembly.
At least one closed loop is formed in the first frame assembly. For example, according to the present invention, the rigidity of the first frame assembly can be further increased as compared with a frame assembly that does not have a closed loop.

The invention according to claim 3 is characterized in that the body frame has a structure in which the first frame assembly and the second frame assembly are vertically divided.
By adopting a structure in which the first frame assembly and the second frame assembly are vertically divided, it becomes possible to mount the other on one of the first frame assembly and the second frame assembly.

  In the invention according to claim 1, since the arm support portion and the shaft support portion that require assembly accuracy are not separated into the first frame assembly and the second frame assembly, each of the arm support portion and the shaft support portion. Assembly accuracy can be increased. Therefore, it is possible to easily set the wheel alignment of the front wheels within a predetermined range, or to perform more accurate steering angle adjustment of the front wheels. This can also contribute to reducing the steering force of the steering wheel.

  Furthermore, since only the first frame assembly and the second assembly are assembled, the number of assembling steps can be reduced and the assembling time can be shortened as compared with the conventional assembly of the divided frame assemblies. it can.

  In the invention according to claim 2, by forming at least one closed loop in the first frame assembly, for example, in the present invention, the rigidity of the first frame assembly is further improved as compared with a frame assembly having no closed loop. It is possible to increase the support rigidity of the suspension arm and the steering shaft.

  In the invention according to claim 3, since the first frame assembly and the second frame assembly are vertically divided, the first frame assembly and the second frame assembly are mounted on the other and combined. Thus, the body frame can be easily assembled.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a perspective view of a rough terrain vehicle employing a vehicle body frame structure according to the present invention. The rough terrain vehicle 10 includes left and right front wheels 11 and 12 and left and right rear wheels 13 and 14 (reference numeral 13 on the front side). Are supported by suspension arms (not shown) that are mounted on the vehicle body frame 15 so as to be movable up and down, and these front wheels 11 and 12 are connected to a power unit 18 at the substantially center of the vehicle body via a front reduction gear 17. The rear wheels 13 and 14 are connected to the power unit 18 via the rear speed reducer 21 and the front wheels 11 and 12 are steered by the handle 26 via a steering shaft (not shown) attached to the vehicle body frame 15. It is.
The power unit 18 includes an engine 22 and a transmission 23 connected to the output shaft of the engine 22.

  Here, 27 is a headlamp, 28 is a fuel tank, 31 is a seat, 32 is a front guard that protects the front of the vehicle body, 33 is a front undercover that protects the suspension and power transmission system on the front side, 34 and 34 (front side) ) Is a front fender that covers the upper and rear of the front wheels 11 and 12, 35 and 35 (only the reference numeral 35 on the front side) is a step on which the driver puts his feet, and 36 and 37 are for loading luggage. Front carriers and rear carriers 38 and 38 (only reference numeral 38 on the front side) are rear fenders that cover the front and upper sides of the rear wheels 13 and 14.

FIG. 2 is a side view showing a vehicle body frame according to the present invention, and an arrow (FRONT) in the drawing represents the front of the vehicle (the same applies hereinafter).
The vehicle body frame 15 has left and right upper main frames 45 and 46 (only the reference numeral 45 is shown on the front side) extending in the front-rear direction, and substantially U-shaped attached to lower front end portions and lower rear portions of these upper main frames 45 and 46. -Shaped lower main frames 47 and 48 (only the front side reference numeral 47 is shown) and substantially crank-shaped front frames 51 and 52 connected to the front ends of the upper main frames 45 and 46 (only the front side reference numeral 51 is shown). )), And L-shaped L-shaped frames 53 and 54 (only the reference numeral 53 on the front side is shown) connected to the upper ends of the front frames 51 and 52 and the upper sides of the upper main frames 45 and 46, respectively. Inclined frames 56 and 57 (reference number 5 on the front side) passed to the front frames 51 and 52 and the lower main frames 47 and 48, respectively. Only the lower frames of the front frames 51 and 52 and the front lower frames 61 and 62 (only the reference numeral 61 on the front side is shown) passed to the lower portions of the lower main frames 47 and 48, and the lower main. Rear standing frames 63 and 64 (only the reference numeral 63 on the near side is shown) standing up from lower rear portions of the frames 47 and 48 and connected to the rear portions of the upper main frames 45 and 46, and lower ends of these rear standing frames 63 and 64 And rear inclined frames 66 and 67 (only the reference numeral 66 on the front side is shown) connected to the upper main frames 45 and 46 at an angle.

  Reference numeral 71 in the figure denotes a left upper arm as a suspension arm that supports the front wheel 11 (see FIG. 1), and is attached to one end of a first arm support bracket 72 that is passed to the left and right front frames 51 and 52 and to the inclined frame 56. The second arm support bracket 73 is supported vertically.

  Reference numeral 75 denotes a left lower arm as a suspension arm that supports the front wheel 11, one end of a third arm support bracket 76 that is passed to the front lower frames 61 and 62, and a fourth arm support bracket that is also passed to the front lower frames 61 and 62. 77 is supported by one end of 77 in a vertically movable manner.

  Further, a right upper arm 81 (not shown; described in FIG. 4) as a suspension arm for supporting the front wheel 12 (see FIG. 1) is connected to the other end of the first arm support bracket 72 and the inclined frame 57 (not shown). It is supported by a second arm support bracket 74 (not shown) attached to the figure so as to be freely movable up and down.

  A right lower arm 82 (not shown; described in FIG. 4) as a suspension arm that supports the front wheel 12 is vertically movable between the other end of the third arm support bracket 76 and the other end of the fourth arm support bracket 77. It is what I supported.

  Here, reference numeral 85 denotes an upper shaft support portion attached to L-shaped frames 53 and 54 for supporting an upper portion of a steering shaft, which will be described later, and 86 and 87 (only the reference numeral 86 on the front side is shown). The left and right reinforcing members 88 passed to the upper main frames 45 and 46, 88, lower shaft support portions attached to the inclined frames 56 and 57 to support the lower portion of the steering shaft, 91 and 92 (only the reference numeral 91 on the front side is shown) .) Is a left and right reinforcing member passed between the lower main frames 47, 48 and the front lower frames 61, 62, and 93, 94 (only the reference numeral 93 is shown on the front side) is a rear bent portion 96 of the lower main frames 47, 48. , 97 (only the reference numeral 96 is shown on the front side) is attached to the pivot supporting the swing shaft of the rear wheel swing arm (not shown). A plate.

  FIG. 3 is a side view of the main part showing the steering shaft support state of the vehicle body frame according to the present invention. The upper shaft support part 85 and the upper part of the upper shaft support part 85 passed to the L-shaped frames 53 and 54 (only reference numeral 53 is shown) The upper portion of the steering shaft 102 is supported by the shaft support bracket 101 attached to the shaft support portion 85 with two bolts 98, and the shaft support member 103 that rotatably supports the steering shaft 102 is attached to the lower shaft support portion 88. This shows that the lower part of the steering shaft 102 is supported. Reference numeral 102a denotes a handle bracket attached to the upper end of the steering shaft 102 for attaching the handle 26 (see FIG. 1), and 105 denotes steering the front wheels 11 and 12 (see FIG. 1) via tie rods and knuckles (not shown). The steering arm is attached to the lower part of the steering shaft 102.

FIG. 4 is a plan view showing a vehicle body frame according to the present invention.
The vehicle body frame 15 extends the upper main frames 45 and 46 so as to spread rearward from the front end, and extends rearward substantially in parallel from the middle of the front portion, and passes the first upper cross member 111 to these upper main frames 45 and 46. The upper brackets 112 are passed to the upper ends of the left and right front frames 51, 52, and the L-shaped frames 53, 54 are passed between the first upper cross member 111 and the upper bracket 112 substantially in parallel. The upper shaft support portion 85 is passed between the L-shaped frames 53 and 54, the lower shaft support portion 88 is passed between the left and right inclined frames 56 and 57, and the left upper arm 71, the right upper arm 81, the left lower arm 75, and the right lower arm 82 are respectively connected. Indicates that the vehicle has been extended to the side.

  Here, 115, 116, and 117 are the second upper cross member, the third upper cross member and the cross plate that are passed to the upper main frames 45 and 46, and 121 to 123 are the first lower cross that are passed between the lower main frames 47 and 48. The cross member, the second lower cross member, and the third lower cross member 125, 126 are cross pipes that are inclined and passed to the first lower cross member 121 and the front lower frames 61, 62.

  FIG. 5 is a front view of an essential part showing a suspension arm mounting structure according to the present invention. A support shaft 131 is attached to the first arm support bracket 72 and a support shaft (not shown) is attached to the second arm support bracket 73 (see FIG. 2). The left upper arm 71 is attached to these support shafts so as to freely swing up and down, the support shaft 133 is attached to the third arm support bracket 76, and the support shaft (not shown) is attached to the fourth arm support bracket 77 (see FIG. 2). ), The left lower arm 75 is attached to these spindles so as to be swingable up and down, and the tips of the left upper arm 71 and the left lower arm 75 are connected to the knuckle 135.

The knuckle 135 is a member that rotatably attaches the front wheel 11 (see FIG. 1) via a hub (not shown).
The structure for mounting the right upper arm 81 (see FIG. 4) and the right lower arm 82 (see FIG. 4) for supporting the front wheel 12 (see FIG. 1) to the vehicle body frame 15 is the same as that of the front wheel 11 described above. Is omitted.

FIG. 6 is a perspective view showing a divided structure of the vehicle body frame according to the present invention.
The vehicle body frame 15 is roughly divided into two parts, and is divided into an upper frame 141 as a second frame assembly and a lower frame 142 as a first frame assembly coupled to the lower part of the upper frame 141. Become.

  For example, if the upper frame 141 and the lower frame 142 are assembled in separate sub-production lines, and the upper frame 141 and the lower frame 142 are assembled in the next main production line, the upper frame 141 and the lower frame 142 are manufactured as one. Assembly time can be shortened compared to assembly in line. This is the reason for separating the body frame 15.

  The upper frame 141 includes the upper main frames 45 and 46, the first upper cross member 111, the second upper cross member 115, the third upper cross member 116, and the cross plate 117 described above. 45a and 46a are upper side coupling portions provided at the front ends of the upper main frames 45 and 46 for coupling to the lower frame 142, respectively.

The lower frame 142 is a portion excluding the upper frame 141 from the body frame 15, that is,
Lower main frames 47 and 48, front frames 51 and 52, L-shaped frames 53 and 54, inclined frames 56 and 57, front lower frames 61 and 62, rear standing frames 63 and 64, rear inclined frames 66 and 67, a first arm Support bracket 72, second arm support brackets 73, 74 (reference numeral 74 is not shown), third arm support bracket 76, fourth arm support bracket 77, upper shaft support portion 85, reinforcing members 86, 87 (not shown). , Lower shaft support portion 88, reinforcing members 91 and 92 (reference numeral 92 is not shown), pivot plates 93 and 94, upper bracket 112, first lower cross member 121, second lower cross member 122, and third lower cross member. 123 and cross pipes 125 and 126. Reference numerals 66a and 67a denote lower side coupling portions provided at the rear ends of the rear inclined frames 66 and 67 for coupling to the upper frame 141, respectively. Similarly, 47a, 48a, 47b, 48b, 63a, 64a are lower side coupling portions.

  Thus, the lower frame 142 includes the upper shaft support portion 85 and the lower shaft support portion 88 that support the steering shaft 102 (see FIG. 3), and the suspension arms (the left upper arm 71, the left lower arm 75, The first arm support bracket 72, the second arm support brackets 73 and 74, the third arm support bracket 76, and the fourth arm support bracket 77 that support the right upper arm 81 and the right lower arm 82) are provided.

  The lower main frames 47 and 48, the inclined frames 56 and 57, the front frames 51 and 52, and the front lower frames 61 and 62 of the lower frame 142 are members that form a closed loop 145.

  As described above with reference to FIGS. 3, 4 and 6, according to the present invention, first, the arm support portions (first arm support bracket 72, second arm support brackets 73, 74) The third arm support bracket 76 and the fourth arm support bracket 77 are provided, and the suspension arms (the left upper arm 71, the left lower arm 75, the right upper arm 81, and the right) are respectively provided by these arm support portions 72, 73, 74, 76, and 77. In order to support the lower arm 82) so that it can swing up and down, and to arrange the front wheels 11 and 12 (see FIG. 1) on the front end side of these suspension arms 71, 75, 81 and 82, and to steer these front wheels 11 and 12 A shaft support portion (upper shaft support portion 85 and In a rough terrain vehicle 10 (see FIG. 1) provided with a shaft support portion 88), the vehicle body frame 15 includes a first frame including arm support portions 72, 73, 74, 76, 77 and shaft support portions 85, 88. It is characterized by a two-part structure comprising a lower frame 142 as an assembly and an upper frame 141 as another second frame assembly.

  Since the arm support portions 72, 73, 74, 76, 77 and the shaft support portions 85, 88 that require assembly accuracy are not separated into the lower frame 142 and the upper frame 141, the arm support portions 72, 73, 74, 76 are not separated. , 77 and the shaft support portions 85, 88 can be assembled with high accuracy. Therefore, the wheel alignment of the front wheels 11 and 12 can be easily set within a predetermined range, and the steering force of the handle 26 (see FIG. 1) can be reduced and the steering angle of the front wheels 11 and 12 can be easily adjusted. .

  Furthermore, since only the lower frame 142 and the upper frame 141 are assembled, the number of assembling steps can be reduced and the assembling time can be shortened as compared with the conventional assembly of the divided frame assemblies.

Second, the present invention is characterized in that at least one closed loop 145 is formed in the lower frame 142.
By forming at least one closed loop 145 in the lower frame 142, for example, the present invention can further increase the rigidity of the lower frame 142 in comparison with a frame assembly having no closed loop, and the suspension arms 71, 75, The support rigidity of 81 and 82 and the steering shaft 102 can be increased.

Thirdly, the present invention is characterized in that the vehicle body frame 15 has a structure in which a lower frame 142 and an upper frame 141 are vertically divided.
By adopting a structure in which the lower frame 142 and the upper frame 141 are divided into upper and lower parts, it becomes possible to mount the other on one of the lower frame 142 and the upper frame 141 and to assemble the body frame 15 easily. be able to.

FIG. 7 is a perspective view showing another embodiment of the divided structure of the vehicle body frame according to the present invention.
The vehicle body frame 150 is roughly divided into two parts, and is divided into an upper frame 151 as a first frame assembly and a lower frame 152 as a second frame assembly coupled to the lower part of the upper frame 151. Become.

  The upper frame 151 includes the upper main frames 45 and 46, the front frames 51 and 52, the first upper cross member 111, the upper bracket 112, the second upper cross member 115, the third upper cross member 116 and the cross plate 117, the front Lower first frames 154 and 155, L-shaped frames 53 and 54, inclined frames 56 and 57, first arm support bracket 72, second arm support brackets 73 and 74 (reference numeral 74 is not shown), and third arm support bracket 76 , A fourth arm support bracket 77, an upper shaft support portion 85, reinforcing members 86 and 87 (not shown), and a lower shaft support portion 88. Reference numerals 56 a and 57 a are upper side coupling portions coupled to the lower frame 152.

  The lower frame 152 is a portion excluding the upper frame 151 from the vehicle body frame 150, that is, the lower main frames 47 and 48, the front lower second frames 157 and 158, the rear standing frames 63 and 64, the rear inclined frames 66 and 67, and the reinforcing member. 91, 92, pivot plates 93, 94, a first lower cross member 121, a second lower cross member 122, a third lower cross member 123, cross pipes 125, 126, and a fourth lower cross member 128. Reference numerals 157a and 158a denote lower side coupling portions provided at the front end portions of the front lower second frames 157 and 158 of the lower frame 152 for coupling to the rear end portions of the front lower first frames 154 and 155 of the upper frame 151. is there.

  The front lower first frame 154 and the front lower second frame 157 described above correspond to the front lower frame 61 shown in FIG. 2, and the front lower first frame 155 and the front lower second frame 158 are the front lower frame shown in FIG. This corresponds to the lower frame 62.

  Thus, the upper frame 151 includes the upper shaft support portion 85 and the lower shaft support portion 88 that support the steering shaft 102 (see FIG. 3), and the suspension arms (the left upper arm 71, the left lower arm 75 shown in FIG. 4, The first arm support bracket 72, the second arm support brackets 73 and 74, the third arm support bracket 76, and the fourth arm support bracket 77 that support the right upper arm 81 and the right lower arm 82) are provided.

  The upper main frames 45 and 46, the front frames 51 and 52, the upper bracket 112, the L-shaped frames 53 and 54, and the first upper cross member 111 of the upper frame 151 are members that form a closed loop 161.

  The vehicle body frame structure of the present invention is suitable for rough terrain vehicles.

1 is a perspective view of a rough terrain vehicle employing a vehicle body frame structure according to the present invention. It is a side view which shows the vehicle body frame which concerns on this invention. It is a principal part side view which shows the steering shaft support state of the vehicle body frame which concerns on this invention. It is a top view which shows the vehicle body frame which concerns on this invention. It is a principal part front view which shows the attachment structure of the suspension arm which concerns on this invention. It is a perspective view which shows the division structure of the vehicle body frame which concerns on this invention. It is a perspective view which shows another embodiment of the division structure of the vehicle body frame which concerns on this invention. It is a perspective view which shows the vehicle body frame structure of the conventional rough terrain vehicle.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Rough terrain vehicle, 11, 12 ... Front wheel, 15, 150 ... Body frame, 71, 75, 81, 82 ... Suspension arm (left upper arm, left lower arm, right upper arm, right lower arm), 72, 73, 74, 76, 77 ... arm support (first arm support bracket, second arm support bracket, second arm support bracket, third arm support bracket, fourth arm support bracket), 101, 103 ... shaft support (shaft support bracket) , Shaft support member), 102 ... steering shaft, 141, 152 ... second frame assembly (upper frame, lower frame), 142, 151 ... first frame assembly (lower frame, upper frame).

Claims (3)

Arm support portions are provided on the left and right of the front part of the vehicle body frame, and the suspension arms are supported by these arm support portions so that they can swing up and down, and front wheels are arranged on the front end side of these suspension arms to steer these front wheels. In a rough terrain vehicle provided with a shaft support part for supporting a steering shaft at the front part of the body frame,
The vehicle body frame has a two-part structure composed of a first frame assembly including the arm support portion and the shaft support portion and a second frame assembly other than the first frame assembly, and the vehicle body of the rough terrain vehicle. Frame structure.   The vehicle body frame structure for an uneven terrain vehicle according to claim 1, wherein the first frame assembly forms at least one closed loop.   The vehicle body frame structure for a rough terrain vehicle according to claim 1 or 2, wherein the vehicle body frame has a structure in which the first frame assembly and the second frame assembly are vertically divided.

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