JP2005289225A - Body frame structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve rigidity of a vehicle body frame, to improve appearance, and to reduce costs, in a body frame structure of a vehicle. <P>SOLUTION: A front frame section 106 of an under frame 101 constituting the lower part of the vehicle body frame 11 is formed in a triangle shape, the front frame section 106 of the under frame 101 is formed in a tip pointed shape in a plan view, the under frame 101 is molded integrally by casting, and an upper arm and a lower arm for supporting right and left front wheels are mounted to the right and left of the front frame section 106, respectively. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle body frame structure for a vehicle that travels on level and uneven terrain.

As a conventional vehicle body frame structure, a structure in which a plurality of pipe frames are joined and assembled is known (for example, see Patent Document 1).
Japanese Patent No. 2671346

FIG. 3 of Patent Document 1 will be described below. In addition, about the code | symbol, what was described in the same gazette was used.
The vehicle body frame 11 includes a main pipe 18 provided at an upper center portion of the vehicle body, a pair of left and right front tubes 19 and 19 extending diagonally forward and downward from a front portion of the main pipe 18, and a pair of left and right extending downward from a rear portion of the main pipe 18. Body tubes 20, 20, a pair of left and right lower tubes 21, 21 that extend integrally forward from the lower part of these body tubes 20, 20 and are connected to the aforementioned front tubes 19, 19, front tubes 19, 19, and A pair of left and right down tubes 26, 26 that are respectively passed to the lower tubes 21, 21, and lean reinforcements 27, 27 provided at positions where the front tubes 19, 19 and the down tubes 26, 26 intersect. Reference numerals 28 and 28 denote mounting brackets for attaching the upper ends of the left and right front cushion units 29 and 29 (see FIG. 1 of the publication).

  The front tube 19 and the lower tube 21 are portions that support the front wheel, and the mounting bracket 28 is a portion that supports the upper end of the front cushion unit 29. The front tube 19 and the lower tube 21 and the mounting bracket 28 are provided on the front wheel side. Therefore, it is desirable that these have high rigidity. In addition, in a saddle riding type vehicle traveling on rough terrain, the body frame 11 has many portions exposed to the outside. Therefore, if the appearance of the body frame 11 is improved, the merchantability of the saddle riding type vehicle is enhanced. Further, it is desirable to reduce the cost for the body frame.

  An object of the present invention is to increase the rigidity of a vehicle body frame in a vehicle body frame structure of a vehicle, improve the appearance, and further reduce the cost.

  According to the first aspect of the present invention, the front portion of the underframe that forms the lower portion of the vehicle body frame is formed in a triangular shape, and the front portion of the underframe is formed in a pointed shape in a plan view. It is characterized by being integrally molded.

  By forming the front part of the underframe in a triangular shape, the rigidity of the front part of the underframe can be increased. In addition, by integrally forming the underframe by casting, for example, in the present invention, it is possible to improve the appearance of the portion exposed to the outside, compared to the underframe assembled by welding with the pipe frame. Further, the cost can be reduced as compared with the welded underframe.

  According to a second aspect of the present invention, a suspension unit for supporting left and right front wheels is attached to the left and right front portions of a triangle-shaped front portion of the underframe, and a cushion unit that absorbs an impact transmitted to the vehicle body frame via these suspension arms. Is arranged so as to extend substantially in the front-rear direction along the body frame.

  Since the suspension arm is supported by the front portion of the underframe having high rigidity, the support rigidity of the suspension arm can be increased. Further, since the cushion unit is arranged along the vehicle body frame, the mass of the cushion unit can be more concentrated on the vehicle center side. Furthermore, the amount of protrusion of the cushion unit toward the vehicle body side can be reduced.

  In the invention according to claim 3, one end of the cushion unit is attached to the vehicle body frame side, and the other end is connected to a link member swingably attached to the vehicle body frame via a pivot portion, and the link member is connected via a rod. It is connected to a suspension arm.

  By connecting the other end side of the cushion unit to the link member and connecting the link member to the suspension arm via the rod, the degree of freedom of arrangement of the cushion unit can be increased by the rod. Can be arranged along.

According to a fourth aspect of the present invention, a skid plate that covers the underframe is provided in front of the underframe, and the skid plate is substantially M-shaped when viewed from the front, so that the skid plate has a pivot portion and a suspension arm attachment portion. It is characterized by covering.
By covering the pivot portion and the suspension arm attachment portion with the skid plate, the pivot portion and the suspension arm attachment portion can be reliably protected.

  In the invention according to claim 5, the underframe has a radiator disposed on the inside, the radiator is constituted by three divided radiators, and the left and right radiators provided on the left and right sides of the left and right frame members of the underframe. A central radiator disposed between each of the left and right radiators is disposed between the left and right frame members.

  The left radiator and the right radiator are arranged above the left and right frame members, and the central radiator is arranged between the left and right frame members, so that the left and right radiators are arranged to the full width of the underframe and the central radiator is arranged. It can extend downward, and the projected area of the entire radiator in front of the vehicle body can be increased.

  In the invention according to claim 1, since the front portion of the underframe is formed in a triangular shape, the rigidity of the front portion of the underframe can be increased, and the suspension arm and the cushion unit are firmly supported by the front portion of the underframe. be able to. Further, since the underframe is integrally formed by casting, the appearance of the portion exposed to the outside can be improved, and the merchantability of the rough terrain vehicle can be improved. Further, the body frame can be reduced in cost by integrally forming the under frame by casting.

  In the invention according to claim 2, since the suspension arm is supported by the front portion of the underframe having high rigidity, the support rigidity of the suspension arm can be increased. Further, since the cushion unit is arranged along the vehicle body frame, the mass of the cushion unit can be more concentrated on the center side of the vehicle, and traveling performance such as turning performance of the rough terrain vehicle can be improved.

  In the invention according to claim 3, since the other end side of the cushion unit is connected to the link member, and the link member is connected to the suspension arm via the rod, the degree of freedom of arrangement of the cushion unit can be increased by the rod, For example, the cushion unit can be disposed along the vehicle body frame, and the vehicle can be configured to be slim, small and compact, and the boarding / exiting and appearance can be improved.

  In the invention according to claim 4, since the pivot portion and the suspension arm attachment portion are covered with the skid plate, the pivot portion and the suspension arm attachment portion can be reliably protected, and the reliability of the rough terrain vehicle is improved. be able to.

  In the invention according to claim 5, since the left radiator and the right radiator are arranged above the left and right frame members, and the central radiator is arranged between the left and right frame members, the left radiator and the right radiator are filled to the full width of the underframe. It is possible to extend the central radiator downward while disposing the radiator, increasing the projected area of the entire radiator to the front of the vehicle body, and improving the cooling capacity of the radiator.

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 showing a vehicle according to the present invention. A rough terrain vehicle 10 is formed by integrally forming a main part of a body frame 11 in a truss shape, left and right front wheels 12 and 13 and left and right rear wheels 14 and 15. (Only one symbol 14 is shown.) A double wishbone type independent suspension (specifically, front suspension 17 for the front wheels and rear suspension 18 for the rear wheels) that is independently suspended is disposed along the body frame 11 respectively. Cushion units 21, 21 and rear cushion units 22, 22 (only one symbol 22 is shown) are provided, and a body plate 11 and a skid plate 24 that covers parts provided on the vehicle body, that is, vehicle-mounted parts, are attached to the front part of the vehicle body frame 11. A sub-frame 25 having a multi-purpose structure is provided at the rear part of the body frame 11, and the front wheels 12, 13 (Only one reference numeral 31.) A rear fender 31 for covering the upper side of the front fender 27 and the rear wheels 14 and 15 cover the person is a vehicle in which the left and right separate bodies.

  FIG. 2 is a side view showing a vehicle according to the present invention. The rough terrain vehicle 10 is a steering shaft for steering front wheels 12 and 13 (only the reference numeral 12 on the near side is shown) at the front of a body frame 11. 41 is rotatably attached, a bar handle 42 is attached to the upper part of the steering shaft 41, a power unit 47 including an engine 45 and a transmission 46 is attached to the center of the vehicle body frame 11, and a pair of left and right from the front of the engine 45 to the rear. The exhaust pipes 51 and 52 are extended, mufflers 53 and 54 (only the reference numeral 53 on the front side is shown) are respectively attached to the rear ends of the exhaust pipes 51 and 52, and a fuel tank 56 is arranged above the engine 45. The vehicle has a sub-frame 25 disposed behind the engine 45 and a seat 57 disposed above the sub-frame 25.

FIG. 3 is a front view showing a vehicle according to the present invention. The rough terrain vehicle 10 is provided with a headlamp 58 at the upper center of the front part, and front fenders 26 and 27 and rear fenders 31 and 32 on the left and right sides of the vehicle body, respectively. The vehicle has a skid plate 24 with a substantially M-shaped front view attached to the lower front portion.
The front suspension 17 includes a pair of left and right upper arms 61 and 62 and a pair of left and right lower arms 63 and 64 that are attached to the body frame 11 so as to freely swing up and down.

  FIG. 4 is a plan view showing a vehicle according to the present invention, in which front fenders 26 and 27, which are separately provided on the left and right sides, are attached to a front cover 65 provided at the front of the vehicle body, and side protrusions provided integrally on the left and right of the subframe 25. Steps 71 in which the left and right rear fenders 31 and 32 are attached to the left and right sides of the vehicle body frame 11 between the front fenders 26 and 27 and the rear fenders 31 and 32, respectively. , 72. Reference numerals 66a and 67a denote bolts for attaching the rear fenders 31 and 32 to the side protrusions 66 and 67, respectively.

The sub-frame 25 is a member that has a rear end formed in a U-shape, and this U-shaped portion is a grab rail 25a that is held by a passenger to support the body.
Above the subframe 25, a pair of left and right mufflers 53, 54 are positioned so as to overlap.

  FIG. 5 is a rear view showing the vehicle according to the present invention. The mufflers 53 and 54 are a muffler body 75 having a muffler function and a cylindrical member surrounding the muffler body 75, respectively. The spark arrester 76 prevents the sparks from the sparks 75 from scattering outside. The spark arrester 76 makes it difficult for the heat generated by the muffler body 75 to be transmitted to the outside, and the spark arrester 76 is separated from the muffler body 75. The temperature rise of the spark arrester 76 itself can be suppressed.

The rear suspension 18 includes a pair of left and right upper arms 81 and 82 and a pair of left and right lower arms 83 and 84 attached to the vehicle body frame 11 so as to freely swing up and down. Reference numerals 86 and 87 denote drive shafts for driving the rear wheels 14 and 15, respectively. Reference numeral 88 denotes a final drive assembly in which one ends of the drive shafts 86 and 87 are connected.
A pair of left and right mufflers 53 and 54 are positioned above the left and right rear cushion units 22 and 22, and the rear cushion units 22 and 22 are arranged while ensuring a balanced appearance and a capacity of the muffler in the rear view. It becomes good.

  FIG. 6 is a perspective view showing a vehicle body frame of a vehicle according to the present invention (an arrow (FRONT in the figure represents the front of the vehicle; the same applies hereinafter)), and the vehicle body frame 11 has a truss-like front portion (truss). ): A frame formed in a triangular shape) and an integrally formed underframe 101 having a pointed shape, a front upper frame 102 joined to an upper front portion of the underframe 101, and an upper rear portion of the underframe 101 And the rear upper frame 103 whose front end is joined to the front upper frame 102, the above-mentioned subframe 25 (see FIG. 2) connected to the side of the rear upper frame 103, and the rear frame 101. And rear frame 104.

  The underframe 101 includes a front frame portion 106 formed in a truss shape, an intermediate frame portion 107 that extends backward from the rear portion of the front frame portion 106 to be lower than the front frame portion 106, and a rear portion of the intermediate frame portion 107. This is a member in which the rear frame portion 108 is integrally molded.

  The front frame portion 106 is formed in a truss shape on the left and right sides, and suspension arms constituting the front suspension 17 (see FIG. 3), that is, upper arms 61 and 62 (see FIG. 3) on the left and right truss-like portions 106a and 106b. Suspension arm mounting portions 61a, 61b, 62a, 62b (only reference numeral 61b) and suspension arm mounting portions 63a, 63b, 64a, 64b (reference numerals 63a, 63b) for mounting lower arms 63, 64 (see FIG. 3) are attached. It is a member provided only. Reference numerals 111 and 112 denote projecting portions for attaching a delta link, which will be described later, constituting the front suspension 17, and 113 and 114 are shaft attachment holes for attaching a swing shaft of the delta link.

  The rear frame portion 108 is a portion provided with groove portions 117 and 118 for arranging the rear cushion units 22 and 22 (see FIG. 4) on the left and right sides, and the bottom portions 121 and 122 of the groove portions 117 and 118 (only one symbol). ) Is formed by penetrating cushion mounting holes 123 and 123 (only one reference numeral 123 is shown) for attaching one end of the rear cushion units 22 and 22.

  The front upper frame 102 is joined to the upper portion of the underframe 101 to form leg portions 131 to 134 that form a left and right truss shape, and a leg portion to rotatably support the upper portion of the steering shaft 41 (see FIG. 2). A pair of left and right cushions integrally provided on the upper portions of the leg portions 131 to 134 to support the handle posts 136 integrally provided on the upper portions of the 131 to 134 and the ends of the front cushion units 21 and 21 (see FIG. 2). It consists of unit support parts 137 and 138. Reference numerals 137a and 137b denote rear cushion unit mounting holes.

  The rear upper frame 103 has a base 142 joined to the rear upper part of the underframe 101, a pair of left and right wing-shaped parts 143, 144 extending rearward from the base 142, and extending forward diagonally upward and downward diagonally downward from the base 142. Thus, the connecting portion 146 joined to the front upper frame 102 is formed. Reference numeral 148 denotes a subframe attachment hole (one of the two subframe attachment portions 148 on the wing-shaped portion 144 side) for attaching the subframe 25 (see FIG. 2).

  The rear frame 104 houses the final drive assembly 88 shown in FIG. 5 and attaches the upper arms 81 and 82 constituting the rear suspension 18 to the suspension arm mounting portions 81a, 81b, 82a, and 82b (reference numeral 81b only) shown in FIG. And a suspension arm mounting portion 83a, 83b, 84a, 84b (only reference numeral 83b is shown) for attaching the lower arms 83, 84 (see FIG. 5).

7A to 7C are cross-sectional views showing respective parts of the vehicle body frame of the vehicle according to the present invention.
6A is a cross-sectional view taken along the line aa of FIG. 6, and the underframe 101 is a bilaterally symmetric member provided with a hollow portion 152 that opens downward, and a step for joining the rear upper frame 103 to the upper portion. Parts 153 and 154 are provided.

  The rear upper frame 103 is a bilaterally symmetrical member provided with a hollow portion 156 that opens downward, and the left and right lower end portions 157 and 158 are joined to the step portions 153 and 154 of the underframe 101, respectively.

  6B is a cross-sectional view taken along the line bb in FIG. 6, and the intermediate frame portion 107 of the underframe 101 is a left-right symmetrical member including the left frame 161 and the right frame 162, and the left frame 161 and the right frame 162 The cross section is formed in a substantially U shape.

  6C is a cross-sectional view taken along the line cc of FIG. 6, and the connecting portion 146 of the rear upper frame 103 has an upper member 165 having a substantially U-shaped cross section and a flat plate shape joined to the lower portion of the upper member 165. Lower member 166.

FIG. 8 is a side view showing the vehicle body frame and suspension of the vehicle according to the present invention. The front suspension 17 includes left and right upper arms 61 and 62 (only the reference numeral 61 is shown on the front side) and left and right lower arms 63 and 64 (front side). Only the reference numeral 63 on the side), push rods 171 and 172 (only the reference numeral 171 on the front side) connected to the front portions of the lower arms 63 and 64 in a swingable manner, and the push rods 171 and 172 The delta links 173 and 174 (only the front side reference numeral 173 is shown) connected to the tip and swingably attached to the underframe 101, and the front cushion unit 21 having one end connected to the delta links 173 and 174. , 21 (only the reference numeral 21 on the front side is shown), upper arms 61, 62 and A knuckle 175 (see FIG. 9) swingably attached to the respective distal ends of the lower arms 63 and 64, and a hub 176 (see FIG. 9) rotatably attached to the knuckle 175. The front wheels 12, 13 ( (See Fig. 4).
The front cushion units 21 and 21 are arranged substantially along the vehicle body frame 11 in a side view.

The rear suspension 18 includes left and right upper arms 81 and 82 (only front side reference numeral 81 is shown), left and right lower arms 83 and 84 (only front side reference numeral 83 is shown), and front portions of these lower arms 83 and 84. Push rods 177 and 178 that are swingably connected (only the front side reference numeral 177 is shown), and delta links 181 and 182 that are connected to the front ends of these push rods 177 and 178 and are swingably attached to the rear frame 104. (Only the front side reference numeral 181 is shown), the above-described rear cushion units 22 and 22 (only the front side reference sign 22 shown) connected to the delta links 181 and 182, the upper arms 81 and 82, and the lower arm Knuckles 183 (see FIG. 9) swingably attached to the tips of 83 and 84; Hub mounted rotatably on knuckle 183 184, 184 (only reference numeral 184 on the near side shown.) Becomes from the attached respectively the rear wheel 15 (see FIG. 4) to the hub 183 and 183.
The rear cushion units 22 and 22 are arranged substantially along the vehicle body frame 11 in a side view.
Here, 179 is a brake caliper attached to the knuckle 183, and 182 is a brake disc attached to the hub 184.

  The front cushion unit 21 and the rear cushion unit 22 are substantially C-shaped when viewed from the side, and contribute to lowering the center of gravity and can effectively support the thrust load from below the front and rear suspensions.

  FIG. 9 is a plan view showing the vehicle body frame and suspension of the vehicle according to the present invention. The front cushion unit 21, 21 is pointed like the front frame portion 106 of the underframe 101, and the front end of the vehicle body from the rear end is shown. Arranged near the center, the rear cushion units 22 and 22 extend in the vehicle front-rear direction along the rear frame portion 108 of the underframe 101 (that is, the left and right rear cushion units 22 and 22 are substantially parallel). It shows that. Reference numerals 185 and 186 denote tie rods having one end connected to the steering shaft 41 (see FIG. 2) side and the other end connected to left and right knuckles 175 and 175.

  As described above, the front cushion units 21 and 21 and the rear cushion units 22 and 22 are disposed along the vehicle body frame 11 and close to the vehicle body frame 11, so that the front cushion units 21 and 21 and the rear cushion units 22 and 22 are disposed. The amount of protrusion of the vehicle body frame 11 from the vehicle body frame 11 can be reduced, and the masses of the front cushion units 21 and 21 and the rear cushion units 22 and 22 can be concentrated on the center side of the vehicle. Traveling performance such as turning performance of the traveling vehicle 10 (see FIG. 4) can be improved, and the rough terrain traveling vehicle 10 can be slimmed, so that getting on and off and appearance can be improved. Further, the rough terrain vehicle 10 can be reduced in size and size.

  FIG. 10 is a perspective view showing the front portion of the vehicle according to the present invention. The push rod 171 includes a rod 191, end members 192 and 193 screwed to both ends of the rod 191, and an end portion with respect to the rod 191. It is a member that can be expanded and contracted by comprising lock nuts 194 and 195 that prevent rotation of the members 192 and 193, and one end is connected to a rod mounting portion 197 provided at the front portion of the lower arm 63 via a ball joint 198. In addition, the other end is connected to the first arm portion 201 provided on the delta link 173 via the ball joint 202 so as to extend substantially in the vertical direction. The push rod 172 (see FIG. 3) has the same structure as the push rod 171 and will not be described.

  The ball joint 198 includes a socket 198a formed integrally with the tip of the end member 192, a ball stud 198b integrally formed with a ball that is rotatably fitted in the socket 198a, and screwed to the rod mounting portion 197. The socket 198a and the ball stud 198b include a dust cover 198c that prevents dust from entering the fitting portions. The ball joint 202 has the same structure as the ball joint 198, and a description thereof will be omitted.

  The delta link 173 is swingably attached to the shaft attachment hole 113 (see FIG. 6) of the lower frame 101 by a swing shaft 205, a cylindrical bearing portion 173a fitted to the swing shaft 205, and this bearing. The first arm portion 201 that extends integrally from the portion 173a, the second arm portion 173b that also extends integrally from the bearing portion 173a, and the tips of the first arm b201 and the second arm portion 173b are integrally connected. This is a triangular member comprising a connecting arm 173c.

The 2nd arm part 173b is a member which attached the edge part attaching part 21a provided in the end of the front cushion unit 21 to the spindle 206 provided in the front end so that swing was possible. The delta link 174 has the same structure as the delta link 173, and a description thereof will be omitted.
Further, the cushion unit support portion 137 of the front upper frame 102 shown in FIG. 6 is a portion to which an end portion attaching portion 21 b provided at the other end of the front cushion unit 21 is attached.

  The skid plate 25 includes the above-described delta links 173 and 174, connecting portions between the delta links 173 and 174 and the front cushion units 21 and 21, the swing shaft 205, the delta links 173 and 174, and the push rods 171 and 172 (reference numerals on the front side). 171 only), a base part of the upper arms 61 and 62 (only the front side reference numeral 61 is shown), and a lower arm 63 and 64 (only the front side reference numeral 63 is shown). .

  FIG. 11 is a perspective view showing the rear part of the vehicle according to the present invention. The push rod 177 includes a rod 211, end members 212 and 213 screwed to both ends of the rod 211, and an end member for the rod 211. The lock nut 214 (not shown) that prevents the rotation of 212 is a member that can be expanded and contracted. One end of the lock nut 214 is connected to a rod mounting portion 217 provided at the front portion of the lower arm 83 via a ball joint 218. At the same time, the other end is connected to the first arm portion 221 provided on the delta link 181 via the ball joint 222 so as to extend substantially in the vertical direction. Note that the push rod 178 (see FIG. 5) has the same structure as the push rod 177, and a description thereof will be omitted. The ball joints 218 and 222 have the same structure as the above-described ball joint 198 (see FIG. 10), and the description thereof is omitted.

  The delta link 181 is swingably attached to a shaft attachment hole (not shown) of the rear frame 104 with a swing shaft 225, and has a cylindrical bearing portion 181a fitted to the swing shaft 225, and the bearing portion 181a. The first arm portion 221 that extends integrally from the first arm portion 221, the second arm portion 181b that also extends integrally from the bearing portion 181a, and the tips of the first arm portion 221 and the second arm portion 181b are integrally connected. It is a triangular member composed of a connecting arm 181c.

  The second arm portion 181b is a member in which an end attachment portion 22a provided at one end of the rear cushion unit 22 is attached to a support shaft 226 provided at the tip so as to be swingable. The delta link 182 (see FIG. 5) has the same structure as the delta link 181 and will not be described.

  FIG. 12 is a plan view showing the rear cushion unit on the left side of the vehicle according to the present invention. The rear cushion unit 22 includes an outer tube 231, an inner tube 232 slidably inserted inside the outer tube 231, these Of the outer tube 231 and the inner tube 232 are provided with end attachment portions 22a and 22b, and a substantially cylindrical reserve tank 233 attached to the end attachment portion 22b. The right rear cushion unit 22 has the same structure as the left rear cushion unit 22 described above.

  The end attaching portion 22b includes an attaching portion main body 22c and a cap member 22d attached to the attaching portion main body 22c with two bolts 235 and 235 (only the reference numeral 235 on the near side is shown). Is a portion to which a piston rod (not shown) extending inside the outer tube 231 is attached, and a piston (not shown) attached to the tip of the piston rod slides on the inner surface of the inner tube 232. Reference numeral 22e denotes a bolt insertion hole for passing a bolt for attaching the end attaching portion 22b to the cushion attaching hole 123 (see FIG. 6) of the underframe 101 (see FIG. 6), and 22f and 22f denote the end attaching portion 22a as the delta link 181. It is a support shaft insertion hole through which the support shaft 226 (see FIG. 11) attached to the support shaft 226 (see FIG. 11) of (see FIG. 11).

  The reserve tank 233 stores oil that enters and exits the outer tube 231 and the inner tube 232, and is fitted into a hole portion 22g that extends between the attachment portion main body 22c of the end portion attachment portion 22b and the cap member 22d. It is a fixed member, that is, a member fixed by being sandwiched between the attachment portion main body 22c and the cap member 22d.

  The above-described front cushion unit 21 (see FIG. 10) is different from the above-described rear cushion unit 22 only in that the shape of the end mounting portion 22b is different from that of the reserve tank 233, and other portions. Is the same structure as the rear cushion unit 22.

  FIG. 13 is a perspective view showing a rear end portion of the vehicle according to the present invention, in which mufflers 53 and 54 are arranged on the left and right above the subframe 25, and a seat 57 is arranged above these mufflers 53 and 54. Indicates.

  As described above, by arranging the mufflers 53 and 54 between the subframe 25 and the sheet 57, the portions where the mufflers 53 and 54 are exposed to the outside can be reduced, and the appearance can be improved.

  Since the sub-frame 25 is a member that also functions as a seat rail that supports the seat 57, it is not necessary to provide a seat rail specially, the number of parts can be reduced, and the cost can be reduced.

FIG. 14 is a perspective view showing a vehicle body frame and exhaust system parts of a vehicle according to the present invention. Exhaust pipes 51, 52 (in the space 241 formed at the joint between the rear upper frame 103 and the sub frame 25 of the vehicle body frame 11 are shown. The exhaust chamber 242 connected between the rear end and the mufflers 53 and 54 is disposed, and a pair of left and right side protrusions 66 and 67 for attaching the rear fenders 31 and 32 (see FIG. 4) to the subframe 25 are arranged. And a tail lamp attaching portion 247 for attaching the tail lamp 246 are integrally provided, and the mufflers 53 and 54 are attached to the subframe 25. Reference numerals 251 and 252 denote sub-frame attachment portions that are integrally projected on the side portions of the wing-shaped portions 143 and 144 of the rear upper frame 103 for attaching the sub-frame 25, and reference numerals 253 and 254 denote attachments to the rear upper frame 103 This is an upper frame connecting portion that is integrally protruded inside the front portion of the subframe 25.
Since the grab rail 25a is provided at the rear end of the main body frame, it is convenient when pushing and pulling the vehicle.

  The exhaust chamber 242 attenuates exhaust noise by expanding the volume of the exhaust gas that has passed through the exhaust pipes 51 and 52, and can enhance the noise reduction effect together with the mufflers 53 and 54.

  FIG. 15 is a perspective view showing a front lower portion of the vehicle according to the present invention, and shows that a radiator 261 having a three-part structure is arranged inside the underframe 101 of the body frame 11.

  The radiator 261 is arranged between the left radiator 262 and the right radiator 263 arranged above the left frame 161 and the right frame 162 (see FIG. 6) of the underframe 101, and between the left radiator 262 and the right radiator 263. The center radiator 264 is disposed between the left frame 161 and the right frame 162. The left radiator 262, the right radiator 263, and the center radiator 264 are connected by connecting portions 266 and 266.

  For example, when a single radiator is used, the projected area of the radiator on the front side of the vehicle is limited by the shape of the vehicle body frame 11. In the present invention, the left radiator 262 and the right radiator 263 are connected to the lower frame 101. The center radiator 264 extends downward between the left frame 161 and the right frame 162, so that the floor frame 101 is skillfully avoided, and the projection area of the radiator 261 on the front side of the vehicle is less likely to be limited. Thus, the projected area can be further increased. Therefore, the cooling capacity of the radiator 261 can be improved.

  Furthermore, by making the upper end of the central radiator 264 lower than the upper ends of the left radiator 262 and the right radiator 263, the space above the central radiator 264 can be used effectively.

  FIG. 16 is a perspective view showing another embodiment of the vehicle body frame of the vehicle according to the present invention. The vehicle body frame 300 includes an integrally formed underframe 301 having a truss-like front portion and a pointed shape. The front upper frame 102 joined to the upper front part of the under frame 301, the rear upper frame 303 joined to the rear upper part of the under frame 301, and the above-mentioned subframe 25 connected to the side of the rear upper frame 303 ( 2) and a rear frame 104 attached to the underframe 301 at the rear.

  The underframe 301 includes a front frame portion 306 formed in a truss shape, an intermediate frame portion 307 extending backward from the rear portion of the front frame portion 306 lower than the front frame portion 306, and a rear portion of the intermediate frame portion 307. This is a member obtained by integrally forming the frame portion 308 after the start-up.

  The front frame portion 306 is formed in a truss shape on the left and right sides, and these truss-shaped portions 306a and 306b are integrally connected by cross members 309 and 309, and the front suspension 17 (see FIG. 3), that is, suspension arm mounting portions 61a, 61b, 62a, 62b (only reference numeral 61b is shown) for mounting upper arms 61, 62 (see FIG. 3) and lower arms 63, 64 (see FIG. 3). Suspension arm attachment portions 63a, 63b, 64a, 64b (only reference numerals 63a, 63b are shown). Reference numerals 311 and 312 denote protrusions provided integrally with the cross members 309 and 309 for attaching the delta links 173 and 174 (see FIG. 3), and reference numerals 313 and 314 denote swing shafts 205 (see FIG. 10) is a shaft mounting hole for mounting.

  The rear frame portion 308 is a portion provided with groove portions 317 and 318 for arranging the rear cushion units 22 and 22 (see FIG. 4) on the left and right sides, respectively, and the bottom portions 321 and 322 of the groove portions 317 and 318 (only one symbol) 1), cushion mounting holes 323 and 323 (only one reference numeral 323 is shown) for attaching one end of the rear cushion units 22 and 22 are formed to penetrate therethrough.

  The rear upper frame 303 includes a base portion 342 joined to the upper rear portion of the under frame 301 and a pair of left and right wing-shaped portions 343 and 344 extending rearward from the base portion 342. Reference numeral 348 denotes a sub-frame mounting hole for attaching the sub-frame 25 (see FIG. 2).

  As described above with reference to FIGS. 3, 4, and 6, according to the present invention, first, the front frame portion 106 as the front portion of the underframe 101 that constitutes the lower portion of the vehicle body frame 11 is triangular. The front frame portion 106 of the underframe 101 is formed in a pointed shape in plan view, and the underframe 101 is integrally formed by casting.

  Since the front frame portion 106 of the underframe 101 is formed in a truss shape, the rigidity of the front frame portion 106 can be increased, and the front frame portion 106 is a suspension arm (that is, the upper arms 61 and 62 and the lower arms 63 and 64). ) And the front cushion units 21 and 21 can be firmly supported. Further, since the underframe 101 is integrally formed by casting, the appearance of the portion exposed to the outside can be improved, and the merchantability of the rough terrain vehicle 10 can be improved. Furthermore, the body frame 11 can be reduced in cost by integrally forming the underframe 101 by casting.

  Secondly, the present invention secondly attaches upper arms 61 and 62 and lower arms 63 and 64 for supporting the left and right front wheels 12 and 13 to the front frame portion 106 of the truss-like shape of the underframe 101, respectively. The front cushion units 21, 21 that absorb the impact transmitted to the vehicle body frame 11 through 62 and the lower arms 63, 64 are arranged so as to extend in the front-rear direction along the vehicle body frame 11.

  Since the upper arms 61 and 62 and the lower arms 63 and 64 are supported by the front frame portion 106 of the underframe 101 having high rigidity, the support rigidity of the upper arms 61 and 62 and the lower arms 63 and 64 can be increased. Further, since the left and right front cushion units 21 and 21 are arranged along the vehicle body frame 11, the mass of the front cushion units 21 and 21 can be more concentrated on the center side of the vehicle. It is possible to improve traveling performance such as performance.

  Thirdly, as described in FIGS. 1, 8 and 10, the present invention attaches one end of each of the front cushion units 21, 21 to the vehicle body frame 11 side and the other end as a pivot portion to the vehicle body frame 11. It is connected to delta links 173 and 174 as link members that are swingably attached via a swing shaft 205, and these delta links 173 and 174 are connected to the lower arms 63 and 64 via push rods 171 and 172. Features.

  Since the other end sides of the front cushion units 21 and 21 are connected to the delta links 173 and 174, and the delta links 173 and 174 are connected to the lower arms 63 and 64 via the push rods 171 and 172, the push rods 171 and 172 are connected. The degree of freedom of arrangement of the front cushion units 21 and 21 can be increased by, for example, the front cushion units 21 and 21 can be arranged along the vehicle body frame 11, and the rough terrain vehicle 10 can be slim, small, and compact. It is possible to improve the boarding / exiting performance and appearance.

  Fourthly, according to the present invention, a skid plate 24 that covers the under frame 101 is provided in front of the under frame 101, and the skid plate 24 is substantially M-shaped when viewed from the front. The arm mounting portions 61a, 61b, 62a, 62b and the suspension arm mounting portions 63a, 63b, 64a, 64b are also covered.

  Since the skid plate 24 covers the swing shaft 205, the suspension arm attachment portions 61a, 61b, 62a, 62b and the suspension arm attachment portions 63a, 63b, 64a, 64b, the swing shaft 205 and the suspension arm attachment portions 61a, 61b, 62a, 62b and suspension arm attachment parts 63a, 63b, 64a, 64b can be reliably protected, and the reliability of the rough terrain vehicle 10 can be improved.

  In the fifth aspect of the present invention, as described with reference to FIGS. 6 and 15, the underframe 101 is provided with a radiator 261 on the inner side. The radiator 261 is composed of three divided radiators, and left and right provided. The right radiators 262 and 263 are disposed above the left frame 161 and the right frame 162 as the left and right frame members of the underframe 101, and a central radiator 264 provided between the left and right radiators 262 and 263 is provided. It is arranged between the left and right left frames 161 and the right frame 162.

  Since the left radiator 162 and the right radiator 263 are arranged above the left frame 161 and the right frame 162 and the center radiator 264 is arranged between the left frame 161 and the right frame 162, the left radiator 262 and the right radiator 263 are underframed. The central radiator 264 can be extended downward while being arranged with the full width of 101, the projected area of the entire radiator 261 toward the front of the vehicle body can be increased, and the cooling capacity of the radiator 261 can be increased.

  The vehicle body frame structure of the present invention is suitable for a vehicle that travels on level and uneven terrain.

1 is a perspective view showing a vehicle according to the present invention. 1 is a side view showing a vehicle according to the present invention. 1 is a front view showing a vehicle according to the present invention. It is a top view which shows the vehicle which concerns on this invention. It is a rear view which shows the vehicle which concerns on this invention. It is a perspective view which shows the vehicle body frame of the vehicle which concerns on this invention. It is sectional drawing which shows each part of the vehicle body frame of the vehicle which concerns on this invention. 1 is a side view showing a vehicle body frame and a suspension according to the present invention. It is a top view which shows the vehicle body frame and suspension of the vehicle which concern on this invention. It is a perspective view which shows the front part of the vehicle which concerns on this invention. It is a perspective view which shows the rear part of the vehicle which concerns on this invention. It is a top view which shows the rear cushion unit of the vehicle which concerns on this invention. It is a perspective view which shows the rear-end part of the vehicle which concerns on this invention. 1 is a perspective view showing a vehicle body frame and exhaust system parts of a vehicle according to the present invention. It is a perspective view which shows the front part lower part of the vehicle which concerns on this invention. It is a perspective view which shows another embodiment of the vehicle body frame of the vehicle which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Rough traveling vehicle, 11,300 ... Body frame, 12, 13 ... Front wheel, 21 ... Front cushion unit, 24 ... Skid plate, 61, 62 ... Suspension arm (upper arm), 61a, 61b, 62a, 62b, 63a , 63b, 64a, 64b ... suspension arm mounting portion, 63, 64 ... suspension arm (lower arm), 101 ... underframe, 106 ... front portion of the underframe (front frame portion), 161, 162 ... frame portion (left frame, Right frame), 171, 172 ... Rod (push rod), 173, 174 ... Link member (delta link), 205 ... Pivot part (swing shaft), 261 ... Radiator, 262 ... Left radiator, 263 ... Right radiator, 264 ... Central radiator.

Claims (5)

  The front part of the underframe that forms the lower part of the body frame is formed in a triangular shape, and the front part of the underframe is formed in a pointed shape in plan view, and this underframe is integrally formed by casting. Body frame structure for rough terrain vehicles.   The underframe has a triangular front part and suspension arms that support the left and right front wheels are attached to the left and right, respectively, and a cushion unit that absorbs shock transmitted to the body frame via these suspension arms is attached to the body frame. The vehicle body frame structure for a rough terrain vehicle according to claim 1, wherein the vehicle body frame structure is arranged so as to extend substantially in the front-rear direction along the vehicle.   The cushion unit has one end attached to the body frame side and the other end connected to a link member swingably attached to the body frame via a pivot portion. The link member is connected to the suspension via a rod. The vehicle body frame structure for a rough terrain vehicle according to claim 2, wherein the vehicle body frame structure is connected to an arm.   A skid plate that covers the underframe is provided in front of the underframe, and the skid plate is substantially M-shaped in a front view so that the pivot portion and the suspension arm mounting portion are also covered with the skid plate. 4. A vehicle body frame structure for a rough terrain vehicle according to claim 1, 2, or 3.   The underframe has a radiator disposed on the inside. The radiator is composed of three divided radiators, and left and right radiators provided on the left and right are disposed above the left and right frame members of the underframe, respectively. The vehicle body of the rough terrain vehicle according to any one of claims 1 to 4, wherein a central radiator provided between the left and right radiators is disposed between the left and right frame members. Frame structure.

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