JP4247902B2 - Bush mounting structure - Google Patents

Description

  The present invention relates to an improved technique of a bush mounting structure for attaching an elastic bush to a frame.

The bush mounting structure is such that various members are mounted on a frame such as a vehicle body frame with an elastic bush through a bracket. The elastic bush includes an inner cylinder, an outer cylinder that surrounds the inner cylinder, and an elastic body that connects the inner cylinder and the outer cylinder. Various types of such bush mounting structures are known (see, for example, Patent Document 1).
Utility Model Registration No. 2601866 (Fig. 1-4)

A conventional bush mounting structure shown in Patent Document 1 will be described with reference to FIG. FIGS. 21A and 21B are schematic views of a conventional bush mounting structure, FIG. 21A shows a side configuration of the bush mounting structure, and FIG. 21B shows a b- in FIG. A b line cross-sectional structure is shown.
This conventional bush mounting structure is such that left and right lateral links 303, 303 are swingably mounted by a bracket 302 on a subframe 301 mounted on a vehicle body. Such an attachment portion is attached via the elastic bushings 304 and 304.

As shown in FIG. 21B, the sub-frame 301 has a downward U-shape by joining the upper upper half 305, the front front 306 and the rear rear 307 joined to the lower part of the upper half 305. It is a press-formed product formed in a cross-section.
Such a sub-frame 301 is attached by inserting a bracket (spacer) 302 made of a downward U-shaped cross-section of another member between the lower end portion of the front lower 306 and the lower end portion of the rear lower 307. The elastic bushings 304 and 304 can be attached to the subframe 301 by bolts 308 and 308 passing through the bracket 302, the lower end portion of the front lower 306, and the lower end portion of the rear lower 307.

By the way, the bracket 302 is required to sufficiently receive the load acting from the axial direction and the radial direction of the elastic bushings 304 and 304 and to transmit the load to the subframe 301 efficiently. For this purpose, it is desired to further increase the mounting strength and support rigidity of the bracket 302 to which the elastic bushings 304 and 304 are attached. Moreover, the bracket 302 is required to have a simple configuration.
However, the conventional bush mounting structure has a configuration in which a bracket 302 having a U-shaped cross section is interposed between the front and rear lowers 306 and 307 as shown in FIG. There is room for improvement in order to further increase the mounting strength and support rigidity of the bracket 302 to which the elastic bushings 304 and 304 are attached.

  It is an object of the present invention to provide a technique capable of further increasing the mounting strength and support rigidity of a bracket for attaching an elastic bush with a simple configuration.

  The invention according to claim 1 is a bush mounting structure in which an elastic bush having a configuration in which an inner cylinder and an outer cylinder surrounding the inner cylinder are connected by an elastic body is attached to a frame by a bracket. In the bush mounting structure in which both ends of the cylinder are sandwiched and an elastic bush is mounted by passing a bolt through the inner cylinder, the bracket has a bracket plate portion having a flat surface in contact with the end surface of the inner cylinder, And a folded portion that is folded back from the bracket plate portion.

The invention according to claim 1 is connected to the fixed space part between the bracket plate part and the folded part and the folded part, and is separated from the bracket plate part by a predetermined distance via the space part . The side plate of the frame at the position, the bolt through hole that passes the bolt through the side plate and the bracket plate portion, and the hole diameter of the hole portion smaller than the head of the bolt opened in the bracket plate portion of the bolt through hole The side plate has a hole diameter that is larger than that of the bolt head, and has a hole diameter larger than that of the bolt head .

The invention according to claim 2 is configured such that the frame is formed of a cylindrical member, and the cross-sectional shape of the cylindrical member in the direction perpendicular to the axis is recessed toward the inside of the cross section, and the bracket plate is formed on the inner surface of the concave portion. The folded portion is formed continuously via a side plate included in the cylindrical member.

  According to the first aspect of the present invention, the bracket plate portion of the bracket is provided with a flat surface in contact with the end surface of the inner cylinder of the elastic bushing, and the simple structure is simply provided by folding back the edge of the bracket plate portion. The rigidity of the bracket plate portion can be further increased by the folded portion. For this reason, the attachment strength and support rigidity of the bracket for attaching the elastic bush can be further increased. Accordingly, the load applied to the bracket plate portion from the elastic bush can be sufficiently received by the bracket, and the load can be efficiently transmitted to the frame.

In the invention which concerns on Claim 1 , it is connected to the fixed space part interposed between the bracket board part and the folding | returning part, and the folding | turning part, and is located in the position away from the bracket board part by a predetermined distance via the space part. A side plate with respect to a hole diameter of a hole smaller than a bolt head portion opened in the bracket plate portion of the bolt through hole through which the bolt passes through the side plate of the frame, the side plate and the bracket plate portion, and the bolt through hole. In addition, since the hole diameter is increased and the hole portion that is larger than the head portion of the bolt is provided , the rigidity of the composite including the bracket plate portion and the folded portion can be increased accordingly. In this way, the rigidity of the bracket plate portion and the folded portion can be further increased.
Further, since the side plate has a hole having a larger hole diameter and larger than the head of the bolt, there is an advantage that the head of the bolt does not protrude outward from the side plate.

In the invention which concerns on Claim 2 , since it comprised so that it might dent toward the inner side of the cross section in the flame | frame which consists of a cylindrical member, the bracket board part was formed in the inner surface of the recessed part. The bracket can be formed integrally with a simple configuration. For this reason, it is not necessary to attach the bracket which consists of another member to a flame | frame. Since the number of parts can be reduced, it is possible to reduce the weight of the composite body including the frame and the bracket and to reduce the cost of the bush mounting structure. Furthermore, since it is not necessary to join a bracket made of a separate member to the frame, it is possible to increase the manufacturing accuracy of the composite made of the frame and the bracket. In addition, the load acting on the bracket plate portion from the elastic bush can be efficiently transmitted to the frame.
Further, since the folded portion that is folded back from the bracket plate portion is continuously formed via the side plate included in the cylindrical member, the load that has acted on the bracket plate portion from the elastic bush is transferred to the cylinder via the folded portion and the side plate. The entire member can be reliably received. The support rigidity of the bracket that supports the elastic bush can be more efficiently increased.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. “Front”, “Rear”, “Left”, “Right”, “Up”, “Down” follow the direction seen from the driver, Fr is front, Rr is rear, L is left, R is right , CL indicates the vehicle body center (vehicle width center).

First, an outline of the vehicle will be described with reference to FIGS.
FIG. 1 is a perspective view of a front portion of a vehicle according to the present invention. The vehicle body frame (vehicle body) 20 of the vehicle 10 has a front structure with left and right front side frames 21 and 21 extending in front and rear of the vehicle body on both sides of the front of the vehicle body, and on the outer side in the vehicle width direction of these front side frames 21 and 21. In addition, left and right upper frames 22 and 22 extending in the longitudinal direction of the vehicle body above and below, left and right front damper housings 23 and 23 spanned between the front side frames 21 and 21 and the upper frames 22 and 22, and left and right front sides This is a monocoque body mainly composed of the front bulkhead 24 coupled to the front portions of the frames 21 and 21 and the front portions of the left and right upper frames 22 and 22.

The front bulkhead 24 includes a lower cross member 25 extending in the vehicle width direction below the front portions of the left and right front side frames 21, 21, and left and right side stays 26, 26 extending upward from both ends of the lower cross member 25. The upper cross member 27 extending in the vehicle width direction so as to be coupled to the upper ends of the side stays 26 and 26 is a main component.
The upper cross member 27 is formed by extending left and right extension portions 28 and 28 obliquely rearward from the left and right end portions, and is coupled to the left and right upper frames 22 and 22 in the middle of the longitudinal direction through the extension portions 28 and 28. .

  Such a vehicle body frame 20 includes front and rear, left and right front parts of the left and right front side frames 21 and 21 and front end parts of the left and right floor frames 31 and 31 extending rearward from the rear ends of the front side frames 21 and 21. The front sub-frame 42 is suspended through four anti-vibration elastic bushes 41 (... indicates a plurality, the same applies hereinafter).

  FIG. 2 is a perspective view around the front side frame according to the present invention. The front sub-frame 42 has a horizontal engine 43 mounted on the right half and a transmission 44 mounted on the left half. The transmission 44 extends the propeller shaft 45 rearward from the output side to transmit power.

FIG. 3 is a perspective view of the rear part of the vehicle according to the present invention. The rear part of the vehicle body frame 20 is mainly composed of left and right rear side frames 51, 51 extending in the longitudinal direction on both sides of the rear part of the vehicle body. The rear side frames 51, 51 are provided with four vibration-proof elastic bushes 52,. The rear sub-frame 53 is suspended via
The rear subframe 53 has a rear differential gear box 54 attached thereto in a suspended manner. Of the rear sub-frame 53, the front side horizontal member 202 on the front side is curved so that both ends are horizontal and the central part protrudes upward in order to avoid interference with the rear differential gear box 54, that is, an arch shape. Presents. Details of the front side member 202 will be described later.

  The power transmitted from the propeller shaft 45 (see FIG. 2) can be distributed and transmitted to the left and right rear wheels by the left and right drive shafts via the rear differential gear in the rear differential gear box 54. As is apparent from the above description and FIGS. 2 and 3, the vehicle 10 is a four-wheel drive vehicle that drives the front and rear wheels with the engine 43 mounted on the front portion of the vehicle body.

  Next, the overall configuration of the front subframe 42 will be described with reference to FIGS. FIG. 4 is a perspective view of the front sub-frame according to the present invention. FIG. 5 is an explanatory diagram of materials of each member constituting the front subframe according to the present invention. FIG. 6 is a plan view of the front sub-frame according to the present invention. FIG. 7 is an exploded perspective view of the front subframe according to the present invention.

  4 and 5, the front subframe 42 is a metal material product, for example, an aluminum product or an aluminum alloy product (hereinafter collectively referred to as “aluminum alloy product”). Of each member shown in FIG. 5, the white material indicates an extruded material (extruded product) or a drawn material (pultruded product), and the satin pattern material indicates a die-cast product.

  As shown in FIGS. 4, 6, and 7, the front sub-frame 42 has a substantially cross-beam shape (# shape) or a square shape in plan view, and left and right vertical members 61, 61 extending in the front-rear direction of the vehicle body. The front horizontal member 62 extending in the left-right direction of the vehicle body to be bridged between the front ends of the vertical members 61, 61, and the rear horizontal member extending in the horizontal direction of the vehicle body to be spanned between the rear ends of the left and right vertical members 61, 61 63, left and right first connecting members 64, 64 for connecting the ends of the front horizontal members 62 to the front ends of the left and right vertical members 61, 61, and lower end surfaces of the rear ends of the left and right vertical members 61, 61 Left and right abutting plates 65, 65 (see FIG. 7) and left and right second connecting members 66, 66 (see FIG. 7) for connecting the end of the rear horizontal member 63 to the rear end of the left and right vertical members 61, 61, respectively. 7).

  The left and right vertical members 61 and 61 are side members of a molded product in which, for example, a square pipe made of a cylindrical extruded material (extruded molded product) is partially formed into an uneven shape by bulge molding or the like. The front horizontal member 62 is a round pipe cross member made of, for example, a cylindrical extruded material (extruded product). The left and right first connecting members 64 and 64 are die-cast products having a substantially L shape in a plan view, and are integrally formed with a vehicle body attachment portion 64b having a through hole 64a vertically passing through a corner. The vertical members 61 and 61 and the front horizontal member 62 can be inserted into the left and right first connecting members 64 and 64 and joined together.

  The rear horizontal member 63 is a cross member made of a die-cast product having a substantially H shape in plan view. More specifically, the rear lateral member 63 has a substantially U-shaped cross section when viewed from the side, is curved in an arc shape that protrudes upward, and has left and right ends that extend in the longitudinal direction of the vehicle body. The sub-vertical members 71 and 71 are integrally formed.

  As shown in FIG. 7, the left and right sub-vertical members 71, 71 are downward U-shaped cross-sections, and are integrally formed with vehicle body attachment parts 73, 73 having through holes 72, 72 penetrating vertically at the rear part. is there. On the other hand, the left and right contact plates 65, 65 are upward U-shaped cross sections. The auxiliary vertical members 71 and 71 can be made into a closed section by overlapping and joining the contact plates 65 and 65 on at least the first half part of the lower surfaces of the auxiliary vertical members 71 and 71.

Further, (1) the rear end portions of the left and right vertical members 61, 61 are joined to the front end portions of the left and right sub-vertical members 71, 71, and (2) the lower surface of the rear end portions of the left and right vertical members 61, 61. And the second connecting members 66 and 66 are overlapped and joined to the lower surfaces of the front end portions of the contact plates 65 and 65, so that (3) the vertical members 61 and 61 are integrally joined to both ends of the rear lateral member 63. can do.
As is clear from the above description, the auxiliary vertical members 71 and 71 and the contact plates 65 and 65 serve as connecting members for integrally joining the vertical members 61 and 61 to both ends of the rear horizontal member 63. At the same time, it also serves as the vertical members 61 and 61.

Such a rear horizontal member 63 includes a plurality of (for example, four front, rear, left and right) first boss portions 74 that protrude upward from the left and right ends of the front edge and the rear edge, and the front edge and the rear portion. Are integrally provided with a plurality of second boss portions 75.
The left and right sub-vertical members 71, 71 are integrally provided with three arm mounting portions 76... Protruding upward at the front upper portion and stabilizer bracket mounting portions 77, 77 bulging upward at the rear upper portion. Prepare for.

By the way, the left and right vertical members 61, 61 have brackets (concave portions) 81, 81 (see FIG. 8) that are open to the outside in the vehicle body width direction. The left vertical member 61 includes a die-cast cover 83 that closes a transmission supporting opening 82 that is open at the top.
The front horizontal member 62 has a power plant support portion 84 attached to the upper center and a jack-up portion 85 attached to the lower center.

Next, the bracket 81 provided on the left vertical member 61 will be described with reference to FIGS. 4, 8, and 9. Note that the bracket 81 provided on the right vertical member 61 has the same configuration as that on the left, and a description thereof will be omitted.
FIGS. 8A and 8B are configuration diagrams of the left vertical member according to the present invention, FIG. 8A shows the configuration of the main part of the left vertical member 61, and FIG. The principal part structure of the vertical member 61 fractured | ruptured by the bb line of (a) is shown.
9A and 9B are configuration diagrams of the left vertical member according to the present invention. FIG. 9A shows a cross-sectional configuration taken along line bb in FIG. FIG. 9B shows a bush mounting structure in which the elastic bush 100 is mounted on the cross-sectional portion of FIG.

As shown in FIGS. 8 and 9A, the left vertical member 61 is a frame formed of a cylindrical member, and the cylindrical member is composed of an upper plate 91, an outer side plate 92, a lower plate 93, and an inner side. The side plate 94 is a member formed in a substantially rectangular closed cross section. The outer side plate 92 corresponds to the left side surface of the front sub-frame 42 shown in FIG.
Such a left vertical member 61 is configured in the middle of the longitudinal direction so that the cross-sectional shape in the direction perpendicular to the axis is recessed toward the inside of the cross section as shown in FIG. At the same time, a through hole 97 a is formed in the bottom 97 of the recess 81.

  The concrete structure of the recess 81 is that the outer side plate 92 is folded back from the edge of the upper plate 91 and the edge of the lower plate 93 into a closed cross section, and the upper and lower plates are moved inward through the upper and lower folded portions 95, 95. The upper and lower bracket plate portions 96, 96 are extended along the plates 91, 93, the bottom 97 is between the extended tips, and a through hole 97 a is opened in the bottom 97.

The upper bracket plate portion 96 is a flat plate in contact with the inner surface of the upper plate 91, and the lower bracket plate portion 96 is a flat plate in contact with the inner surface of the lower plate 93. In this manner, the upper and lower bracket plate portions 96 and 96 can be formed on the inner surface of the recess 81.
As shown in FIG. 9, the bottom 97 is a flat plate substantially parallel to the inner side plate 94 at a position having a certain gap from the inner side plate 94. The through hole 97 a is a large hole that opens to the vicinity of the upper and lower edges of the bottom 97. Since the bottom 97 is less affected by external force, the vertical member 61 can be reduced in weight by opening the through hole 97a.

  As shown in FIG. 9 (a), the folded portions 95, 95 have an annular cross-sectional shape that slightly bulges up and down from the edge of the upper plate / lower plate 91, 93 to the bracket plate portions 96, 96. It is the part that turned back to. Therefore, the folded portions 95, 95 have certain space portions S1, S1. Therefore, it can be said that the folded portions 95 and 95 are portions formed continuously with the vertical member 61 that is a cylindrical member. The turned-up portions 95 and 95 and the bracket plate portions 96 and 96 face each other through the fixed space portions S1 and S1.

  As is clear from the above description, the recess 81, that is, the bracket 81 has bracket plate portions 96 and 96, and folded portions 95 and 95 that are folded back from the bracket plate portions 96 and 96. Thus, the bracket 81 is characterized in that it is integrally provided in the middle of the longitudinal member 61 (see FIG. 8A) formed of a cylindrical frame. Furthermore, the bracket 81 has a bolt through-hole 98 penetrating vertically. The bolt through hole 98 penetrates the upper plate 91, the lower plate 93 and the upper and lower bracket plate portions 96, 96.

  FIG. 9B shows a bush mounting structure in which the elastic bush 100 is mounted on the vertical member 61 with a bracket 81. The elastic bush 100 is a vibration isolating member having a configuration in which an inner cylinder 101 and an outer cylinder 102 surrounding the inner cylinder 101 are connected by an elastic body 103 such as a rubber, and an arm member such as a lower arm of a front suspension is connected to the outer cylinder 102. 112 is integrally provided.

The bracket 81 is arranged so that both ends of the inner cylinder 101 are sandwiched between bracket plate portions 96 and 96, and are attached by bolts 104 through the inner cylinder 101 and bolt through holes 98. . The upper and lower bracket plate portions 96, 96 have a flat surface in contact with each end surface of the inner cylinder 101.
The upper plate 91 and the upper bracket plate portion 96 are overlapped with each other, and the lower plate 93 and the lower bracket plate portion 96 are overlapped to increase rigidity, and the elastic bush 100 is fastened by two plates on the upper and lower sides. Can support.

  As is apparent from the above description, according to the bush mounting structure shown in FIGS. 8 and 9, the bracket plate portions 96, 96 are provided with a flat surface in contact with the end surface of the inner cylinder 101 in the elastic bush 100, and the bracket plate portion. The rigidity of the bracket plate portions 96, 96 can be further increased by the folded portions 95, 95, although the folded portions 95, 95 are simply provided by folding the edges of the 96, 96. For this reason, the attachment strength and support rigidity of the bracket 81 for attaching the elastic bush 100 can be further increased. Accordingly, the load acting on the bracket plate portions 96, 96 from the elastic bush 100 can be sufficiently received by the bracket 81, and this load can be efficiently transmitted to the vertical member 61.

  Furthermore, since the bracket plate portions 96 and 96 and the folded portions 95 and 95 are opposed to each other through the fixed space portions S1 and S1, the bracket plate portions 96 and 96 and the folded portions 95 and 95 are correspondingly provided. The rigidity of the composite can be increased. In this way, the rigidity of the bracket plate portions 96, 96 and the folded portions 95, 95 can be further increased.

  Further, since the vertical members (frames) 61 made of a cylindrical member are configured to be recessed toward the inner side of the cross section, the bracket plate portions 96, 96 are formed on the inner surface of the concave portion 81. The bracket 81 can be integrally formed with the vertical member 61 made of the above by a simple configuration. For this reason, it is not necessary to attach the bracket which consists of another member to the vertical member 61. FIG. Since the number of parts can be reduced, it is possible to reduce the weight of the composite body including the vertical member 61 and the bracket 81, and to reduce the cost of the bush mounting structure. Furthermore, since it is not necessary to join a bracket made of a separate member to the vertical member 61, it is possible to improve the manufacturing accuracy of the composite body including the vertical member 61 and the bracket 81. In addition, the load applied to the bracket plate portions 96 and 96 from the elastic bush 100 can be efficiently transmitted to the vertical member 61.

  Further, since the folded portions 95 and 95 folded back from the bracket plate portions 96 and 96 are formed continuously with the vertical member 61 made of a cylindrical member, the load acting on the bracket plate portions 96 and 96 from the elastic bush 100 is reduced. The entire vertical member 61 can be reliably received via the folded portions 95 and 95. The support rigidity of the bracket 81 that supports the elastic bush 100 can be further increased efficiently.

Next, the configuration around the front sub-frame 42 and the front suspension 110 will be described with reference to FIGS. Since the left and right front suspensions 110, 110 have the same configuration, only the left side will be described and the right side will be omitted.
FIG. 10 is a perspective view in which the front suspension and the steering gear box are attached to the front subframe according to the present invention.
FIG. 11 is a plan view of a main part in which a front suspension is attached to a front subframe according to the present invention.
FIG. 12 is an exploded view of the front subframe, the front suspension, and the steering gear box according to the present invention.

  As shown in FIG. 10, the left front suspension 110 includes an upper arm 111 attached to the front side frame 21 so as to be able to swing up and down, a lower arm 112 attached to the left vertical member 61 and the sub vertical member 71 so as to be capable of swinging, and a lower arm. 112, a front cushion 113 mounted between the front damper housing 23 (see FIG. 1), an upper arm 111, and a knuckle 114 connected to the lower arm 112. is there.

  As shown in FIGS. 10 to 12, the lower arm 112 is a substantially Y-shaped member in plan view that extends from the knuckle coupling portion 121 that couples the knuckle 114 to the front front arm 122 and the rear rear arm 123. It is. The tip of the front arm 122 is attached to the bracket 81 of the vertical member 61 via the elastic bush 100 so as to be able to swing up and down with a bolt 104 (see also FIG. 9B). On the other hand, the front end portion of the rear arm 123 is attached to the rear bracket 124 via an elastic bush (not shown) so that it can swing up and down with a bolt 125. The rear bracket 124 is attached to the arm attaching portions 76 of the sub-vertical member 71 with bolts 126.

  The sub-vertical member 71 is obtained by attaching a stabilizer bracket 131 to the stabilizer bracket attaching portion 77 with bolts 132 and 132. The stabilizer bracket 131 is a member that supports a rod-shaped stabilizer 133 that connects the left and right lower arms 112 (only the left is shown).

  The rear lateral member 63 also serves as a member for fixing the steering gear box 141 extending in the left-right direction of the vehicle body. The steering gear box 141 is a member that houses a gear mechanism (for example, a power steering gear mechanism) for converting a steering force of a steering handle (not shown) into a steering force in the left-right direction of the vehicle body and taking it out from the tie rod 142. The tie rod 142 is connected to the arm 114a of the knuckle 114.

  A steering gear box 141 and an aluminum die-cast cover 143 are stacked on the rear side member 63 in this order from above, and these members are fastened to the first boss portions 74 with bolts 144. The steering gear box 141 can be attached to the front subframe 42 by fixing the cover 143 to the two boss portions 75 with bolts 145.

The anti-vibration elastic bush 41 that mounts the four corners of the front sub-frame 42 at the lower part of the vehicle body frame 20 (see FIG. 1) includes upper and lower elastic bush members 151 and 152 and mounting bolts 153.
The transmission supporting opening 82 of the left vertical member 61 is for attaching an anti-vibration elastic bush 161 to the cover 83 with bolts 162. The elastic bush 161 is a member for mounting the transmission 44 (see FIG. 2) on the front subframe 42.

  Next, the overall configuration of the rear subframe 53 will be described with reference to FIGS. FIG. 13 is a perspective view of a rear subframe according to the present invention. FIG. 14 is a material explanatory view of each member constituting the rear subframe according to the present invention. FIG. 15 is a plan view of a rear subframe according to the present invention.

  As shown in FIGS. 13 and 14, the rear sub-frame 53 is a metal material product, for example, an aluminum product or an aluminum alloy product (hereinafter collectively referred to as “aluminum alloy product”). Among the members shown in FIG. 14, the white material indicates an extruded material (extruded product) or a drawn material (pultruded product), and the satin pattern material indicates a die-cast product.

  As shown in FIGS. 13 and 15, the rear sub-frame 53 has a substantially parallel beam shape (# shape) or a square shape in plan view, and left and right vertical members 201 and 201 extending in the front-rear direction of the vehicle body, and these vertical members. A front horizontal member 202 extending in the left-right direction of the vehicle body to be hung between the front ends of 201, 201; a rear horizontal member 203 extending in the left-right direction of the vehicle body to be hung between the rear ends of the left and right vertical members 201, 201; Consists of.

The left and right vertical members 201, 201 are side members of a die-cast product, and a front vehicle body mounting portion 211 extending outward from the front end in the vehicle width direction and a rear vehicle body mounting portion 212 extending outward from the rear end in the vehicle width direction are integrated with each other. By being formed, the overall shape is a member having a substantially U-shape that faces outward in the vehicle width direction in plan view. The front vehicle body attachment portion 211 and the rear vehicle body attachment portion 212 have a through-hole 213 penetrating vertically at the tip.
Such vertical members 201, 201 include front upper and rear upper upper brackets 214, 214, a plurality of suspension bracket mounting portions 215, front lower portions, lower rear rear brackets 216, and stabilizer brackets, respectively. A mounting portion 217 is provided integrally.

The front / rear horizontal members 202 and 203 are formed, for example, by forming a rectangular pipe made of a cylindrical extruded material (extruded product) or a drawn material (pultruded product) into a partially uneven shape by bulge molding or the like. This is a cross member of a molded product. As shown in FIG. 13, the front lateral member 202 has a recess 221 as a bracket. The rear lateral member 203 has a pair of left and right mounting through holes 222 and 222.
By inserting both ends of the front / rear horizontal members 202, 203 into the left and right vertical members 201, 201, they can be joined together.

Next, the bracket 221 provided on the front lateral member 202 will be described with reference to FIGS.
16 (a) to 16 (e) are configuration diagrams of the front lateral member according to the present invention, FIG. 16 (a) shows a configuration of the front lateral member 202 viewed from the front, and FIG. FIG. 16C shows the configuration of the front horizontal member 202 viewed from the front lower side, FIG. 16C shows the configuration of the front horizontal member 202 broken along the line cc of FIG. 16A, and FIG. FIG. 16A shows the configuration of the front horizontal member 202 broken along the line dd in FIG. 16A, and FIG. 16E shows the configuration of the front horizontal member 202 broken along the line ee in FIG. Show.

17 (a) and 17 (b) are configuration diagrams of the front horizontal member according to the present invention, and FIG. 17 (a) is a cross-sectional view of the front horizontal member 202 taken along the line dd in FIG. 16 (a). FIG. 17B shows a configuration of the bushing in which the elastic bushing 240 is attached to the cross-sectional portion of FIG.
FIG. 18 is a perspective view of a configuration in which an elastic bush is attached to the front lateral member according to the present invention.

As shown in FIGS. 16 and 17A, the front horizontal member 202 is a frame constituted by a cylindrical member, and the cylindrical member is an upper plate 231, a front side plate 232, a lower plate 233, and a rear side plate 234. And a member formed in a substantially rectangular closed cross section. The front side plate 232 corresponds to the front surface of the rear subframe 53 shown in FIG. The lower plate 233 is parallel to the upper plate 231, and the rear side plate 234 is parallel to the front side plate 232.
Such a front horizontal member 202 is configured in the middle of the longitudinal direction so that the cross-sectional shape in the direction perpendicular to the axis is recessed toward the inside of the cross section as shown in FIG. Is. The recess 221 is a recess elongated along the arch shape of the front lateral member 202.

  A specific configuration of the recess 221 is that the lower plate 233 is folded back in a closed cross section from the edge of the front side plate 232 and the edge of the rear side plate 234, and the front / rear side plate 232 is inwardly via the folded portions 235 and 235. , 234 and the front and rear bracket plate portions 236 and 236, and the extended tip between the bottoms 237, a rectangular cross section is obtained.

As shown in FIG. 17A, the front bracket plate 236 is located at a certain distance from the front side plate 232, and the rear bracket plate 236 is located at a certain distance from the rear side plate 234. The front and rear side plates 232 and 234 and the front and rear bracket plate portions 236 and 236 are flat plates parallel to each other. Therefore, the folded portions 235 and 235 have certain space portions S2 and S2. Accordingly, it can be said that the folded portions 235 and 235 are portions formed continuously with the front lateral member 202 which is a cylindrical member. And the folding | returning parts 235 and 235 and the bracket board parts 236 and 236 have mutually opposed via fixed space part S2 and S2. The bottom 237 is at a position having a certain gap from the upper plate 231.
In this manner, the front and rear bracket plate portions 236 and 236 can be formed on the inner surface of the recess 221.

  As is clear from the above description, the concave portion 221 as a bracket has bracket plate portions 236 and 236 and folded portions 235 and 235 that are folded back from the bracket plate portions 236 and 236. Thus, the bracket 221 is characterized in that it is integrally provided in the middle of the longitudinal direction of the front lateral member 202 made of a cylindrical frame.

  Further, as shown in FIG. 16, the bracket 221 has a pair of left and right bolt through holes 238, 238 penetrating horizontally. These bolt through holes 238 and 238 penetrate the front and rear side plates 232 and 234 and the front and rear bracket plate portions 236 and 236, and are symmetrical to the front lateral member 202 with respect to the vehicle width center line CL. In position.

As shown in FIG. 17A, the hole diameters of the holes in the front and rear side plates 232 and 234 are larger than the hole diameter of the holes in the bracket plate parts 236 and 236 in the bolt through hole 238.
At the position of the bolt through hole 238, the bracket 221 inserts a cylindrical collar 239 from the hole of the rear side plate 234, hits the insertion tip against the plate surface of the rear bracket plate portion 236, and the hole of the rear side plate 234. The collar 239 was joined by welding or the like. On the other hand, since the hole on the front side plate 232 side is large, the head of the bolt can be taken in and out and the tool can be hung.

FIGS. 17B and 18 show a bush mounting structure in which a pair of left and right elastic bushes 240 are mounted to the front lateral member 202 with a bracket 221. The elastic bush 240 is a vibration isolating member having a configuration in which an inner cylinder 241 and an outer cylinder 242 surrounding the inner cylinder 241 are connected by an elastic body 243 such as a rubber, and an arm member such as a rear differential gear box is connected to the outer cylinder 242. A suspension arm 247 is provided integrally to suspend 54 (see FIG. 3).
The bracket 221 is characterized in that both ends of the inner cylinder 241 are arranged so as to be sandwiched between bracket plate portions 236 and 236 and are attached by bolts 244 that pass through the inner cylinder 241 and bolt through holes 238. The front and rear bracket plate portions 236 and 236 have flat surfaces in contact with the end surfaces of the inner cylinder 241.

  The procedure for attaching the elastic bushing 240 will be described with reference to FIG. First, the elastic bushing 240 is inserted into the recess 221, that is, the bracket 221 from below, and then the bolt 244 is inserted into the bolt through hole 238 from the front side plate 232 side, passed through the inner cylinder 241 and the collar 239, and the nut 245 is tightened.

Thus, the elastic bushing 240 can be attached to the front lateral member 202 by sandwiching both ends of the inner cylinder 241 with the bolts 244 and the nuts 245 via the bracket plate portions 236 and 236 and the collar 239. The head 244a of the bolt 244 does not protrude outward from the front side plate 232 because the front plate 232 is spaced apart from the front bracket plate 236 by a certain dimension.
Further, since the collar 239 joined to the rear side plate 234 is applied to the plate surface of the rear bracket plate portion 236 and tightened with the bolts 244 together with both ends of the inner cylinder 241, the support rigidity of the front side member 202 is increased. be able to.

  As is apparent from the above description, according to the bush mounting structure shown in FIGS. 16 to 18, the bracket plate portions 236 and 236 are provided with a flat surface in contact with the end surface of the inner cylinder 241 in the elastic bush 240, and the bracket plate portion. In spite of a simple configuration in which the folded portions 235 and 235 are provided by folding the edges of 236 and 236, the folded portions 235 and 235 can further increase the rigidity of the bracket plate portions 236 and 236. For this reason, the attachment strength and support rigidity of the bracket 221 for attaching the elastic bush 240 can be further increased. Therefore, the load applied to the bracket plate portions 236 and 236 from the elastic bush 240 is sufficiently received by the bracket 221 and the load can be efficiently transmitted to the front lateral member 202 as a frame.

  Furthermore, since the bracket plate portions 236 and 236 and the folded portions 235 and 235 are opposed to each other via the fixed space portions S2 and S2, the bracket plate portions 236 and 236 and the folded portions 235 and 235 are correspondingly provided. The rigidity of the composite can be increased. In this way, the rigidity of the bracket plate portions 236, 236 and the folded portions 235, 235 can be further increased.

  Furthermore, the bracket plate portions 236 and 236 are formed on the inner surface of the recess 221 by being configured to be recessed toward the inside of the cross section of the front side member (frame) 202 made of a cylindrical member. The bracket 221 can be integrally formed on the front lateral member 202 made of a member with a simple configuration. For this reason, it is not necessary to attach the bracket which consists of another member to the front part horizontal member 202. FIG. Since the number of parts can be reduced, it is possible to reduce the weight of the composite including the front side member 202 and the bracket 221 and to reduce the cost of the bush mounting structure. Furthermore, since it is not necessary to join a bracket made of a separate member to the front lateral member 202, the manufacturing accuracy of the composite composed of the front lateral member 202 and the bracket 221 can be increased. In addition, the load acting on the bracket plate portions 236 and 236 from the elastic bush 240 can be efficiently transmitted to the front lateral member 202.

  Further, since the folded portions 235 and 235 folded from the bracket plate portions 236 and 236 are formed continuously with the front side member 202 made of a cylindrical member, the elastic bush 240 acts on the bracket plate portions 236 and 236. The load can be reliably received by the entire front lateral member 202 via the folded portions 235 and 235. The support rigidity of the bracket 221 that supports the elastic bushing 240 can be further increased efficiently.

19 (a) to 19 (c) are modified views of the front lateral member according to the present invention, and are shown corresponding to FIG. 17 (a), and are bolt through holes formed in the bracket 221. FIG. The modification of 238 part is shown.
The modified example shown in FIG. 19A has an annular flange 251 protruding outward at the edge of the bolt through hole 238 opened in the front side plate 232. The modification shown in FIG. 19B has an annular flange 252 that protrudes inwardly at the edge of the bolt through hole 238 opened in the front side plate 232. The modification shown in FIG. 19 (c) has an annular edge 253 that is thicker than the plate thickness at the edge of the bolt through hole 238 opened in the front side plate 232.
By providing burring and the like on the edges of the bolt through holes 238 opened in the front and rear front side plates 232 and the bracket plate portions 236 and 236 in this way, the holes 251 and 252 and the annular edge portion 253 are provided. The strength of the surroundings can be increased to reduce the stress concentration.

  Next, the configuration around the rear subframe 53 and the rear suspension 260 will be described with reference to FIG. Since the left and right rear suspensions 260 and 260 have the same configuration, only the left side will be described and the right side will be omitted.

  FIG. 20 is a perspective view in which a rear suspension is attached to a rear subframe according to the present invention. The left rear suspension 260 includes an upper arm 261 attached to the upper brackets 214 and 214 so as to be able to swing up and down, and a front lower arm 263 attached to the suspension bracket attaching portion 215. A rear lower arm (not shown) attached to the lower rear bracket 221 (see FIG. 13) so as to be able to swing up and down, a knuckle 264 connected to the upper arm 261 and the front and rear lower arms 263, a knuckle 264 and a rear damper (not shown). The main components are a rear cushion 265 attached to the housing, a trailing arm 267 in which the front portion of the knuckle 264 is connected to the lower front bracket 221 and a rod-shaped stabilizer 269 in which the left and right rear lower arms are connected. Rear sub frame 53 is a rear-wheel suspension system for suspending the rear wheels.

The stabilizer 269 is attached to the stabilizer bracket mounting portion 217 of the rear subframe 53 by the stabilizer bracket 271.
In the figure, reference numeral 272 denotes a rear wheel drive shaft. Reference numerals 275 and 275 denote anti-vibration elastic bushes for mounting the rear differential gear box 54 (see FIG. 3).

In the embodiment of the present invention, the frame for attaching the elastic bushes 100 and 240 is not limited to the front subframe 42 and the rear subframe 53, and can be applied to various frames. The body frame 20 may be used.
Moreover, the cylindrical member which comprises a flame | frame is not limited to the cylinder of square cross sections, such as a substantially square shape, For example, the cylinder of a round cross section may be sufficient.
The material, shape, and dimensions of the frame and bracket are arbitrary.
Further, the member attached to the frame by the bracket through the elastic bushes 100 and 240 is not limited to the suspension component or the rear differential gear box 54, but is arbitrary.

  The bush mounting structure of the present invention is suitable for a vehicle such as an automobile in which a suspension component or a power transmission device component is attached to a frame.

It is a perspective view of the front part of the vehicle concerning the present invention. It is a perspective view around the front side frame according to the present invention. It is a perspective view of the rear part of the vehicle concerning the present invention. It is a perspective view of the front subframe concerning the present invention. It is material explanatory drawing of each member which comprises the front sub-frame which concerns on this invention. It is a top view of the front subframe concerning the present invention. It is a disassembled perspective view of the front sub-frame which concerns on this invention. It is a block diagram of the left vertical member which concerns on this invention. It is a block diagram of the left vertical member which concerns on this invention. It is the perspective view which attached the front suspension and the steering gear box to the front sub-frame which concerns on this invention. It is a principal part top view which attached the front suspension to the front sub-frame which concerns on this invention. FIG. 3 is an exploded view of a front subframe, a front suspension, and a steering gear box according to the present invention. It is a perspective view of the rear subframe concerning the present invention. It is material explanatory drawing of each member which comprises the rear sub-frame which concerns on this invention. It is a top view of the rear sub-frame which concerns on this invention. It is a block diagram of the front side member which concerns on this invention. It is a block diagram of the front side member which concerns on this invention. It is a perspective view of the structure which attached the elastic bush to the front side member which concerns on this invention. It is a modification figure of the front side member which concerns on this invention. It is the perspective view which attached the rear suspension to the rear sub frame which relates to this invention. It is a schematic diagram of the conventional bush mounting structure.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 20 ... Body frame, 42 ... Front sub-frame, 53 ... Rear sub-frame, 61, 202 ... Frame (tubular member), 81, 221 ... Bracket (recessed part), 95, 235 ... Folding part, 96, 236 ... Bracket plate part, 100, 240 ... Elastic bush, 101, 241 ... Inner cylinder, 102, 242 ... Outer cylinder, 103, 243 ... Elastic body, 104, 244 ... Bolt, S1, S2 ... Constant space part.

Claims (2)

A bush mounting structure in which an elastic bush having a configuration in which an inner cylinder and an outer cylinder surrounding the inner cylinder are connected by an elastic body is attached to a frame by a bracket, and the bracket sandwiches both ends of the inner cylinder. In the bush mounting structure in which the elastic bush is mounted by passing a bolt through the inner cylinder,
The bracket includes a bracket plate portion having a plane in contact with the end surface of the inner cylinder, a folded portion folded back from the bracket plate portion, and a fixed space portion interposed between the bracket plate portion and the folded portion. A side plate of the frame that is connected to the turn-up portion and spaced apart by a predetermined distance in parallel to the bracket plate portion through the space portion, and a bolt that passes the bolt through the side plate and the bracket plate portion Of the through hole and the bolt through hole, the hole diameter of the hole portion smaller than the bolt head portion opened in the bracket plate portion is made larger in the side plate and larger than the bolt head portion. A bush mounting structure characterized by having an open hole . The frame is composed of a cylindrical member, and the cross-sectional shape in the direction perpendicular to the axis of the cylindrical member is recessed toward the inside of the cross section, and the bracket plate portion is formed on the inner surface of the recess, , the folded portion bush mounting structure of 請 Motomeko 1 wherein you characterized in that it is formed continuously through the side plates included in the tubular member.

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