JPH01109186A - Frame structure for car - Google Patents

Abstract

PURPOSE: To achieve both weight reduction and enhancement of rigidity and facilitate manufacture by forming a front frame from a pair of right and left box-shaped members having suspension mounting parts attached to their respective outer surfaces, and connecting a rear frame to the front frame. CONSTITUTION: The frame 1 of a vehicle, e.g. a four-wheeled buggy, comprises a front frame 10 and a rear frame 40. In this case, the rear frame 40 comprises lower and upper cross members 43, 44 suspended between the rear lower parts 41a, 42a and the rear upper parts 41a, 42b of right and left members 41, 42. The front frame 10 comprises right and left members 20, 30 forming a box- shaped closed cross section, and brackets 24, 25 forming the mounting parts of a front wheel suspension unit are attached to the main bodies 21, 31 of the members 20, 30. The front ends 41e, 42e of the members 41, 42 of the rear frame 40 are fitted into recess parts 22a, 23a in the mounting parts 22, 23 of the front frame 10.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application) The present invention relates to a frame structure suitable for use in vehicles such as four-wheeled buggies.

(Prior Art) A four-wheel buggy vehicle equipped with ultra-low pressure tires called balloon tires for riding on saddles and traveling on rough terrain has been put into practical use.

The frame of this type of vehicle is as disclosed in Japanese Patent Application Laid-Open No. 62-83283, in which frame members made of left and right loop-shaped vibrators are connected by a cross member, and the left and right rear wheels are driven by swing arms. The left and right front wheels are supported in a swingable manner to form a rear wheel suspension mechanism, while the left and right front wheels employ a suspension mechanism, such as a double wishbone type suspension device, for steering and buffering. The upper and lower A-arms are pivoted to the left and right so that they can swing up and down, and the knuckle arms are supported at the tips of the upper and lower A-arms to support the front wheels so that they can be steered freely, and the Jl impulse is performed by the up-and-down movement of the A-arms. let

In order to support the above front wheel suspension mechanism, separate support frames are added to the front of the frame on the left and right, and multiple cross members are installed between the left and right support frames and between the lower members at the front of the frame to increase rigidity. Brackets are fixed to the outer sides of the left and right support frames and the front parts of the left and right frames at a distance from each other in the front and back, and the upper and lower A-arm bases are pivotally supported by these brackets.

(Problems to be Solved by the Invention) The conventional frame described above is formed of a pipe-like frame up to the front wheel support part, and a vibe-like member that supports the steering suspension mechanism is attached to the front part. First of all, there are many frame members such as support members and cross members, and the number of parts including suspension arm support brackets is large, and since these parts are assembled by welding, the number of welding steps increases, making frame fabrication cumbersome, complicated, and reduces productivity. Second, it is difficult to maintain precision because a large number of vibe-like members are welded and the brackets are welded.Furthermore, the weight increases because cross members etc. are often used to maintain rigidity. Moreover, there are problems such as disadvantages in terms of cost due to the above.

The present invention has been made to solve the above problems, and its objectives are to simplify the structure of the frame, facilitate manufacturing, improve accuracy, reduce weight, and further reduce cost. To obtain a frame for a vehicle that allows for.

(Means for Solving the Problems) A means for solving the above problems has a front frame including a suspension attachment part, a rear frame including a riding part, an engine mount part, etc. The front frame is formed of an integrated structure of a pair of left and right box-shaped members each having a suspension device mounting member on each outer surface, and the rear frame is connected to the front frame.

(Effects of the above means) According to the above means, since the front frame is box-shaped, it is possible to achieve high rigidity while reducing weight, and the number of parts is extremely small compared to a vibe frame, making it easy to manufacture. .

(Embodiments) Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 6 show a first embodiment of the present invention, FIG. 1 is a side view of the frame, FIG. 2 is a perspective view, FIG. 3 is an exploded perspective view of the front frame, and FIG. Figures 4 to 346 are the first
Figure 4-4 line! FIG. 6 is a sectional view taken along line 6-6.

The embodiment shows a frame for a four-wheel buggy vehicle for traveling on rough terrain, and the frame 1 is composed of a front frame 10 and a rear frame 40. In this embodiment, the rear frame 40 refers to a portion substantially behind the left and right front wheels 2, and includes left and right members 41 and 42 that are approximately U-shaped and long in the front and back direction when viewed from the side. It is formed by bending a square vibrator, and a lower cross member 43 made of a vibrator is installed between the rear lower parts 41a and 42d of the left and right members 41 and 42 to connect them, and between the rear upper parts 41b and 42b. A plate-shaped upper cross member 44 is installed.

Handle stays 45, 46, which are generally triangular in side view, are provided on the upper portions 41c, 42c of the members 41, 42, and the stays 45, 46 protrude forward and upward while being biased towards the center of the vehicle body. A head tube 47 for supporting the steering stem of the handlebar is fixedly installed at the top of the frame, and the stay 45° 46 and the head tube 47 constitute a truss structure with a fixed view from the side and the front and rear, increasing the rigidity of the upper part of the frame.

Stays 48° 49 for the engine 3 mount are extended rearward from the middle portions of the inner sides of the lower portions 41d and 42d of the left and right members 41 and 42, and the stays 48 and 49 are extended toward the center of each other, and the rear end portions 48a of the stays 48 and 49 are .

49a is connected to the lower cross member 43. A bracket 50.50 for supporting the engine 3 is protruded from the front part of the lower parts 41d and 42d of the members 41 and 42, and a bracket 50.50 for supporting the engine 3 disposed on the lower parts 41d and 42d is provided between the left and right members 41 and 42. The front left and right sides of the crankcase 3a are connected to the bragets 50 and 51 via stays 4, while the engine 3
The rear end of the transmission case 3b is attached and supported by a bracket 51, 51 protruding from the rear of the lower cross member 43.

The already mentioned lower cross member 43 of the left and right members 41 and 42
A pivot bracket 52, 52 for the rear swing arm 5 is fixedly installed on the upper inner side of the connecting portion.
The left and right rear wheels 6 are supported at the rear of the vehicle, thereby forming a rear wheel suspension system.

Left and right seat rails 53.54 extend rearward in parallel from the upper rear ends of the left and right members 41, 42, and the front ends of the seat rails 53.54 are connected to the upper cross member 44.
A cross member 56 is fitted and welded to the cylindrical brackets 55.55 projecting rearward on the left and right sides of the seat rails 53.55, and a cross member 56 for supporting the rear end of the seat is constructed between the rear portions of the seat rails 53.54. A seat bracket 57.57 for supporting the front portion of the seat is provided on the seat bracket 55.55.

Glue pastes 58, 59 for maintaining rigidity are diagonally interposed between the rear lower surfaces of the seat rails 53, 54 and the lower rear portions of the left and right members 41, 42.

As described above, the rear frame 40 mounts the engine 3, supports the seat, supports the rear wheel 6 in suspension, and supports the steering wheel.

The front frame 10 consists of left and right members 20 and 30, which are box-shaped members that are integrally joined to each other and form a box-shaped closed section, with opposing inner surfaces open. Left and right members 20.
30 main body 21.31 has side pieces 21a, 31a, side piece 21
Upper and lower pieces 21 b, 21 c, and 31 b are bent to project inward from each of the four peripheral edges of a and 31 a.
, 31 c, front and rear pieces 21d, 21e, 31d, 31
E is provided.

The middle parts of the side pieces 21a and 31a are provided with symmetrical recesses 21f and 31f that protrude inward to increase the section modulus and increase the rigidity, and furthermore, the upper and lower parts of the rear of the main body 21.31 have symmetrical recesses 21f and 31f that protrude inwardly. Mounting portions 22, 23° 32 (the lower mounting portion of the one on the left is hidden and not shown in the drawing) are formed.

The mounting portions 22, 23, 33, etc. are provided with recesses 22a, 23a, etc., each having a rectangular cross section and opening rearward and outward.

The left and right members 20 and 30 described above are press-molded from steel plates or aluminum alloy plates, and each part is integrally formed.

On the outer surfaces of the side pieces 21a and 31a of the main body 21°31 of the left and right members 20 and 30, vertically spaced brackets 24°25, 34, and 35, which form the attachment portion of the front wheel suspension system, are integrally joined by welding or the like. Stop.

Since the brackets 24, 25, 34, and 35 constitute a double wishbone type suspension in the embodiment, it is necessary to attach the upper and lower arms of A type in plan view, so weld them to the outer surfaces of the side pieces 21a and 31a, respectively. flat base 24a.

Provided at 25a, 34a, 35a and near both ends thereof,
The bifurcated attachment portions 24b are spaced apart in the front-rear direction.

24c, 25b, 25c, 34b, 34c.

35b are provided respectively. Bracket 2
4.25.34.35 are vertically spaced apart from each other and integrally welded in advance to the respective upper brackets 24.34.
mounting parts 24b, 24c.

The base end of an A-type upper arm (not shown) is pivotally connected to 34b and 34c, and the base end of the lower arm is similarly pivotally connected to the mounting portion of the lower bracket 25, 35.

In this way, suspension brackets 24, 25, 34.degree. 35 are integrally provided on the left and right members 20, 30 in advance.

The above members 20, 30 are joined and fixed together by welding or the like, but in this embodiment, the inwardly extending portions 21g of the front and lower, upper and lower peripheral frame portions 21b to 21e of the left member 20 are connected to the right side. It is set large enough to fit on the outside of the same circumferential frame portions 31b to 31e of the member 30, and the circumferential end 21h of the extension portion 21g is welded W to the outer periphery of the circumferential frame portions 31b to 31e. This is shown in FIG. 4, and thereby forms a box-shaped front frame 10 with a closed cross section.

Incidentally, as shown in FIG. 7, a pipe-shaped cross member 11 may be interposed between the opposing recesses 21f and 31f.

Fusea mounting portions 2 provided at the top and bottom of the left and right rear portions of the front frame 10 made of the box-like structure obtained in this way
2, 23, 32 etc. recess 22a.

Attach the left and right members 41° 42 of the rear frame 40 to 23a, etc.
The upper and lower parts 41c, 41d, and 42c.

42d front ends 41e, 41e, 42e, 42e are fitted and welded to form a frame as shown in FIGS. 1 and 2.

8 to 13 show a second embodiment of the present invention.

Since the basic structure is the same as that of the embodiment described above, the same parts are denoted by the same reference numerals, and detailed explanation will be omitted.

Also in this embodiment, the rear frame 40 is the same as above,
It includes left and right members 41, 42, a handle stay 45, a seat rail 53, a justi 58, etc., which are made of a bent square pipe material and a welded structure, and support the engine 3, a seat (not shown), a handle, etc. .

The front frame 110 forms a box-like body with a closed cross section when it is joined and assembled in the same manner as described above.

The left and right members 120 and 130 are recesses 122a and 123 that open outward and rearward above and below the rear end of the main body 121.
Frame attachment portions 122, 123, 132, etc. having shapes such as a are provided in a protruding manner.

On each outer surface of the side pieces 121a, 131a, four bifurcated brackets 124-.
134..., which pivotally supports the left and right upper and lower A-arms forming the suspension component members described above.

The above-mentioned frame mounting parts 122, 123, 132, etc., suspension bracket 124...

134... are formed integrally with each of the members 120, 130, and the member 12o includes these parts.

130 is formed by die-casting of aluminum alloy or the like.

The left and right members 120 and 130, each of which has a mounting part and a bracket integrally molded with a cast product, have an open inner side 1i121h,
131h are butted together and the outer periphery is welded to form a joint.
A front frame 110 is formed and is shown in FIG.

In the embodiment shown in FIG. 13, left and right members 120 and 130 are bolted together and integrated, and a plurality of flanges 126..., 136... are provided on the outer periphery of the members 120, 130, and one of the flanges 126, 136... Pass the bolt 127 through and tighten the nut 13 from the installation side. In this way, the left and right members 120 and 130 may be joined together using bolts and nuts.

In Fig. 9, 8A and 8B indicate the upper and lower A-arms that constitute the front wheel suspension, and arm 8A.

The knuckle 9 is supported at the tip of 8B, and the front wheel 2 is supported so as to be vertically swingable and steerable.

14 to 16 show a third embodiment, in which the rear frame 40 has the same structure as described above, so the same parts are denoted by the same reference numerals and detailed explanation will be omitted.

This embodiment shows a frame of a four-wheel drive vehicle, which is a four-wheel buggy.

In the figure, 40 is a rear frame, 41 and 42 are left and right members, 45 is a handle stay, 53 is a seat rail, and 58 is a beam.

The output from the mission case 203b of the engine 203 is output to the front and rear wheel propulsion shafts ao and at, and the rear wheel propulsion shaft 6
1 is extended rearward and guided to a differential gear 63 supported by a reaction unit 62, and is output from the differential gear to left and right rear wheels via left and right output shafts 64. The front wheel propulsion shaft 60 extends toward the front frame 210 and is tilted forward and upward, so that a joint 65 is interposed therebetween.

The front frame 210 includes left and right members 22o.

230, and on each outer surface of the main bodies 221, 231 are mounting portions 224 for mounting the upper and lower A-arms 209 constituting the same front wheel suspension as described above.

234... are provided in the front and back, and are spaced apart vertically, four each, and at the rear of each member 220, 230 are frame mounting parts 222, 223, which are spaced apart vertically and protrude rearward.
233 etc. are provided, and the members 220 and 230 are all integrally molded from aluminum alloy. member 220
, 230 is integrated with flanges 22 on the outer periphery of the left and right members.
A plurality of flanges 226°236... are integrally formed, and the flanges 226°236... are connected with bolts 227 and nuts 237 to form a box-shaped front frame 210 with a closed cross section. Bolt 241.242 with 223, 233 etc.
... to the left and right members 41 of the rear frame 240.
．． It is combined with the upper and lower partial tips of 42.

The space S formed within the above box-shaped front frame 210
A front wheel differential device 66 is installed inside.

The differential device 66 includes a housing-shaped large driving gear 6,
The gear portion 67a is formed in the shape of a ring gear, and is connected to the flange portion 6C of the housing portion 67b.
Bearings 68, 68 are inserted into bearing boss holes 228, 238 in which the shaft-shaped boss portions 67d, 67d formed on the left and right sides of the frame 210 are formed in the center portions of the left and right member bodies 221, 231 of the frame 210.
It is rotatably supported through. Housing part 67b
Differential large gears 89.70 are provided facing each other on the left and right sides of the inside, and the left and right front wheel drive shafts 71.72 fixed thereto are loosely engaged with the left and right shaft-like boss portions 67d, 67d to form the member main body 221.
．． 231 and extend outward from the constant velocity joint 3, 7.
3 to the left and right front wheel axles 74. Connect to F5. Differential small gears 76 and 76 which are meshed and interposed between the large differential gears 69 and 70 are rotatably provided in the housing portion 67b via a support shaft 77 so as to face each other in the front and rear direction.

On the other hand, a cylindrical bearing hole 211 is provided at the rear of the front frame 210.
An intermediate drive shaft 8 is inserted and supported in the longitudinal direction through a bearing 79, and the rear end of the shaft 78 is connected to the front wheel propulsion shaft 60 through a joint 180. A drive small gear 81 is provided so as to face inside the case 210, and is meshed with the gear portion 67a of the drive large gear 6f described above.

As described above, the front wheel differential device 66 is installed in the front frame 210.
This eliminates the need for a gear case for the differential, and the front frame 210 also serves as the gear case. The gear case is the front frame, which is large and has high rigidity, and the internal differential gear is perfectly protected.Also, the storage space is large, so the size, type, and structure of the differential gear can be selected and designed as desired. There is a high degree of freedom.

(Effects of the Invention) As is clear from the above, according to the present invention, in the frame of a four-wheel buggy, etc., the front frame is a box-shaped jointed structure, and the front frame is a press-formed product before joining, or Since the parts for attaching the front wheel suspension member are provided in advance on the cast member, the front frame member becomes a box-shaped half, which simplifies the structure, reduces the number of parts, and reduces the number of welding and joining steps. In addition, unlike assembling and joining the vibrator materials, productivity is improved, and precision is improved because the mounting parts are provided in advance on the left and right halves and the front frame is formed by joining the halves. However, it is possible to suppress the occurrence of fluctuations in accuracy as in the past, and the cost can be reduced as a result of the above, and since the front frame is made into a box-shaped body, a space is created inside, making it suitable for implementation in four-wheel drive vehicles. The differential gear can be built inside the frame, eliminating the need for a gear case and simplifying the front wheel drive system for this type of vehicle.Secondly, the front frame is a box-shaped closed section, which provides high rigidity. Therefore, it can be formed from a press-formed product of steel plate or a cast product of aluminum alloy, etc., making it lightweight, and since many frame components and reinforcing members are not required, the structure can be simplified and lightened in this respect as well. There are many advantages such as being able to

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of the frame, FIG. 2 is a perspective view thereof, FIG. 3 is an exploded perspective view of the front frame, and FIG. 4 is a side view of the frame. -4 line sectional view, Figures 5 and 6 are Figure 1 line 5-5 and 6-6 sectional views, Figure 7
The drawings are similar to Fig. 4 of the modified embodiment, Fig. 8 is a side view of the frame of the second embodiment, Fig. 9 is a plan view of the same essential parts, and Fig. 8 is a side view of the frame of the second embodiment.
0 is a sectional view taken along the line 10-10 in FIG. 8, FIG. 11 is an exploded perspective view of the front frame, FIG. 12 is a longitudinal sectional front view of the front frame, and FIG. FIG. 14 is a side view of the frame of the third embodiment, FIG. 15 is a cross-sectional plan view of the same main part, and FIG. 16 is an enlarged cross-sectional plan view of the main part. In the drawings, 1 is a frame, 40 is a rear frame, 3 is an engine, 10, 110, 210 are front frames, 20.
30, 120, 130, 220° 230 are left and right members,
24.25.34,35°124.134,224,2
34 is a mounting member for a suspension system, and 66 is a differential gear. Patent applicant: Agent for Honda Motor Co., Ltd.
Patent Attorney Part 2 1) Part 1 Patent Attorney
Kuni Ohashi Production volume Patent attorney Small
Yama Yuyuki Patent Attorney No 1)
Shigeru Figure 11 Figure 12 Figure 13

Claims (4)

[Claims] (1) A pair of left and right boxes, each having a front frame including a mounting part for a suspension system, and a rear frame including a riding part, an engine mount part, etc., with a front frame provided with a mounting member for the suspension system on each outer surface. 1. A frame structure for a vehicle, characterized in that it is formed of an integrated structure of shaped members, and a rear frame is connected to the front frame. (2) The frame structure for a vehicle according to claim 1, wherein the pair of left and right box-shaped members of the front frame are formed of press-molded products, and a suspension device mounting member is integrally bonded to each outer surface. (3) The frame structure for a vehicle according to claim 1, wherein the pair of left and right box-shaped members of the front frame are formed of a cast product integrally molded with a suspension device mounting member. (4) The frame structure for a vehicle according to claim 1, wherein a front wheel differential device is built into the front frame.