JPH078164U - Vehicle rear suspension mounting structure - Google Patents

Abstract

(57) [Summary] [Purpose] Preventing the decrease in vehicle body strength due to the structure of mounting the rear suspension struts inside the side frame, and increasing the strength and rigidity around the strut mounting part.
The vibration noise of the vehicle body is reduced and the controllability is improved. [Structure] An outer vertical wall 31, an inner vertical wall 32, and a predetermined width range along the inner vertical wall 32, which are joined and fixed to the wheel apron 2, are left in the side frame 3, and a portion on the outer vertical wall side is cut away. A wide portion 3a including a lower surface 33 provided with an opening 33a is provided, and an outer joint surface 41 of the suspension bracket 4 is joined and fixed to the outer vertical wall 31 and a lower end portion of the inner vertical surface 42 is joined and fixed to the lower surface 33. The upper surface 43 is the opening 3
By attaching to the wide portion 3a in a state in which the upper portion of 3a is closed, a closed cross section b that is continuous with the closed cross section a of the general part of the side frame 3 is formed by the inner vertical wall 32, the lower surface 33, and the inner vertical surface 42. The upper portion 43 of the suspension bracket 4 is provided with a mounting portion for the strut 9.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle rear suspension mounting structure.

[0002]

[Prior art]

 A suspension spring is provided between the suspension arm of the vehicle rear suspension and the side frame above it, and the vertical swing reaction force of the rear suspension is received by the side frame via the suspension spring. In order to take a sufficient vertical expansion and contraction stroke of the suspension spring, the suspension spring is fixed in a state that a substantially tubular bracket with an upper end surface is embedded in the side frame, and the lower end portion is attached to a suspension arm. The upper end of the bracket is attached to and supported by the upper end surface of a bracket embedded in the side frame, which has been conventionally developed and disclosed in Japanese Utility Model Laid-Open No. 63-85576.

[0003]

[Problems to be solved by the device]

 In the above-mentioned conventional one, although the expansion and contraction stroke of the suspension spring can be sufficiently taken, since a large hole is provided on the lower surface of the side frame, the closed cross section in the vehicle front-rear direction formed by the side frame is interrupted by the hole. The problem is that the strength of the vehicle body decreases and the input load from the suspension cannot be effectively distributed to the wheel apron, which is a vertical wall, and it is difficult to secure sufficient strength rigidity around the suspension load input section. have.

The present invention aims to address the above-mentioned conventional problems.

[0005]

[Means for Solving the Problems]

 The present invention widens the width of the portion of the side frame facing the inside of the rear wheel apron to form an outer vertical wall that is fixedly joined to the lower portion of the rear wheel apron, an inner vertical wall that bulges inward, and the inner vertical wall. A wide bracket consisting of a lower part with a specified width along the vertical wall and an opening formed by cutting out the part on the outer vertical wall side is formed, and a suspension bracket consisting of the outer joint surface, the inner vertical surface and the upper surface is formed. , The outer joint surface and the lower portion of the inner vertical surface are bonded and fixed to the outer vertical wall and the lower surface of the wide portion, respectively, and the upper surface completely closes the opening of the lower surface of the wide portion. By mounting, the inner vertical surface of the suspension bracket, the inner vertical wall of the wide portion, and the bottom surface form a closed cross section that is integrally continuous with the closed cross section of the side frame general section before and after the wide section. Top of suspension bracket The first feature is that the strut mounting portion of the rear suspension is provided, and in the above configuration, the lower end portion of the inner vertical surface of the suspension bracket is joined and fixed on the lower surface of the wide portion and extends along the inner vertical wall of the wide portion. A lower joint surface for reinforcing the closed cross section is integrally formed, and a doubler joined and fixed on the lower surface of the general portion of the side frame is joined and fixed to at least the front and rear portions of the lower joint surface, and the doubler and the lower joint surface. The second feature is that a subframe for mounting the suspension arm of the rear suspension is attached to the joint fixing portion.

[0006]

[Action]

 With the structure having the first characteristic described above, the closing surface portion formed by the side frame has a structure that passes through in the front-rear direction with the basic cross-sectional shape as it is, so that it is possible to sufficiently secure the vehicle body strength and to close the wide portion. Since the strut mounting portion is provided between the inner vertical surface of the suspension bracket forming the outer wall of the cross section and the outer vertical wall of the wide portion, the suspension load input to the strut mounting portion is applied from the outer vertical wall to the rear wheel apron. , And effectively distributed to the inner closed cross section, the strength and rigidity around the strut mounting part are greatly improved, and it is possible to reduce vibration noise of the vehicle body and improve maneuverability. Further, by adding the configuration having the second characteristic, it is possible to increase the mounting strength of the subframe without using a special reinforcing component.

[0007]

【Example】

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

FIG. 1 shows a first embodiment of the present invention, in which 1 is a floor, 2 is a rear wheel apron, and 3 is affixed to the lower surface of the side edge of the floor 1 to form a closed cross section in the front-rear direction. The side frame 3 is formed in such a shape that the width is widened in the vicinity of a rear suspension mounting portion, which will be described later, that is, a portion located inside the wheel apron 2.

In the wide portion 3 a of the side frame 3, the upper portion of the outer vertical wall 31 is joined and fixed to the lower portion of the wheel apron 2, and the inner vertical wall 32 is curved and bulges inward, and the lower surface 33 thereof is provided with the wide portion 3 a. The structure is such that an opening 33a reaching a lower portion of the outer vertical wall 31 is formed while leaving a predetermined width portion (a width portion approximately the same as the lower surface of the general portion of the side frame) along the inner vertical wall 32, and the outer joint is formed. The suspension bracket 4 including the surface 41, the inner vertical surface 42, and the upper surface 43 is fixed to the outer vertical wall 31 by bonding the outer bonding surface 41 to the outer vertical wall 31, and the lower surface 33 is bonded and fixed to the lower end flange portion of the inner vertical surface 42. The upper surface 43 of the suspension bracket 4 is attached to the wide portion 3a in a state where the upper surface of the opening 33a is completely closed, whereby the inner vertical wall 32, the lower surface 33, and the inner vertical surface 42 of the suspension bracket 4 are attached. And with The closed cross section b, which is continuous with the closed cross section a of the general part formed by the frame 3, is formed along the inside of the wide portion 3a.

The doubler 5 is continuously bonded and fixed to the inside of the lower surface of the closed cross section a formed by the side frame 3 and the closed cross section b formed in the wide portion 3a continuous with the closed cross section a. A frame reinforcement 6 is fixed to an upper part of the frame 3 so as to vertically partition the closed surface part a of the general part and the closed cross-section part b in the wide part 3a continuous with the general surface part. The suspension bracket 4 is reinforced.

A mounting hole 43a for mounting a rear suspension strut is provided at the center of the upper surface 43 of the suspension bracket 4, and the suspension bracket reinforcement 7 is fixed so as to surround the mounting hole 43a. The peripheral portion of the mounting hole 43a is reinforced. The outer surface 71 of the suspension bracket reinforcement 7 is bonded and fixed to the outer vertical wall 31 of the side frame 3, and front and rear surfaces 72, 72 of the front and rear end portions of the outer surface 71 have end flanges 73, 73. The suspension bracket 4 is joined and fixed to the inner vertical surface 42, and the upper surface 74 of the suspension bracket reinforcement 7 is joined and fixed to the lower side of the mounting hole 43a of the suspension bracket upper surface 43 and the mounting hole 43a of the suspension bracket 4. While increasing the rigidity of the peripheral portion, the suspension load input to the upper surface 43 of the suspension bracket 4 is effectively transmitted to the vertical wall surfaces such as the outer vertical wall 31 of the frame 3 and the inner vertical surface 42 of the suspension bracket. There is.

Reference numeral 8 denotes a cross member that is joined and fixed to the lower surface of the floor 1 to form a closed cross section in the vehicle width direction. Both side ends of the cross member 8 are approximately central portions of the wide portion 3 a of the side frame 3 ( The most bulged part). Reference numeral 8a denotes a cross member linking member for improving the bonding strength between the cross member 8 and the closed section b formed on the wide portion 3a of the side frame 3.

In the mounting hole 43 a provided in the upper surface 43 of the suspension bracket 4, the upper end portion of the conventionally known strut 9 including the shock absorber 91 and the suspension spring 92 on the outer periphery of the shock absorber 91 and the top mount rubber 93 is interposed. To install.

With the above-described structure, the allowable expansion / contraction stroke of the strut 9 can be sufficiently taken, and the inside of the peripheral portion of the strut mounting portion has a closed cross-section portion continuous with the closing surface portion a of the general portion. It is connected to two vertical wall surfaces of the inner vertical surface 42 of the suspension bracket 4 and the inner vertical wall 32 of the side frame forming the b. Suspension load that is connected to the wall 31 firmly and straightly and that is input to the strut attachment part is transmitted from the outer vertical wall 31 of the wide portion 3a of the side frame to the wheel apron 2 that is a strong vertical wall above it. Moreover, the load is transmitted from the closed cross section b to the cross member 8, and the load is effectively distributed to the vertical wall surfaces and the cross member around them. By virtue of their being dispersed, the strength and rigidity in the vicinity of the rear suspension mounting part can be significantly improved, and the vibration noise of the vehicle body can be reduced and the maneuverability can be improved.

Further, as shown in FIG. 1B, the lower surface of the wide portion 3a of the side frame 3 is formed into an inclined surface that rises from the inner side to the outer side, and by doing so, the suspension arm swings up and down. By combining a suspension mounting structure that allows a large dynamic angle and a sufficient allowable expansion / contraction stroke of the strut 9 with a structure that can increase the vertical swing angle of the suspension arm, a softer characteristic can be obtained. It is extremely effective in that it can obtain a good rear suspension, and especially when a double wishbone suspension is adopted as the rear suspension, it can sufficiently respond to the swing of the upper arm 10.

FIG. 2 shows a second embodiment of the present invention. In the second embodiment, the lower end of the inner vertical surface 42 of the suspension bracket 4 is located inside the lower surface 33 of the wide portion 3a of the side frame. The lower joint surface 44, which is joined and fixed to the vertical wall 32, is integrally bent, and the lower joint surface 44 is joined and fixed from the lower surface 33 of the wide portion 3a to near the lower portion of the inner vertical wall 32. The joint surface 44 plays the same role as the doubler of the first embodiment, and the doubler 5 is further wrapped at the joint between the lower surface 33 of the wide portion 3a and the lower joint surface 44 (as shown in the figure, The front and rear end portions of the joint surface 44 may be overlapped with the doubler 5 or the lower joint surface 44 may be entirely overlapped with the doubler 5). 3 sheet stack with 5 The subframe 11 for mounting the upper arm of the rear suspension is attached to the rear suspension. The structure other than the above is the same as that of the first embodiment shown in FIG. 1, and the same reference numerals in FIG. It represents a part.

That is, the lap portion between the doubler 5 and the front and rear ends of the lower joint surface 44 and the frame reinforcement 6 above the lap portion are provided with bolt insertion holes, and the intermediary cylinder 12 is interposed and fixed between them. , The bolts 13 are inserted into the upper and lower bolt insertion holes and the tube 12 between them to fix the heads of the bolts 13 to the frame reinforcement 6, and to attach the bolts 13 to the front and rear end portions of the sub-frame 11. It is attached via a bush.

In the second embodiment configured in this way, similarly to the first embodiment shown in FIG. 1, the strength and rigidity around the strut mounting portion of the rear suspension are improved and the vibration noise of the vehicle body is reduced. In addition to improving the maneuverability, the subframe 11 is mounted on the lower surface 33 of the wide portion of the side frame, the lower joint surface 44 of the suspension bracket 4 and the doubler 5 which are stacked. This makes it possible to increase the mounting strength of the subframe without adding special reinforcing parts.

As shown in FIG. 2, the doubler 5 is divided into a front doubler 51 and a rear doubler 52, and the rear end of the front doubler 51 and the front end of the lower joint surface 44 are wrapped and fixed. If the front end portion of the rear doubler 52 and the rear end portion of the lower joint surface 44 are fixed to each other by wrapping them, and the two front and rear lap portions are used as the mounting portions of the subframe 11, For example, the rear doubler 52 mainly considers the absorption of collision energy at the time of a rear surface collision, and the front doubler 51 mainly considers the reinforcement of the bending of the side frame 3 and sets the plate thickness of the doubler separately to suit each purpose. It is also possible to achieve the operational effect of being advantageous in terms of repeatability.

[0020]

[Effect of device]

 As described above, according to the present invention, by providing the wide portion on the side frame and fixing the suspension bracket to the outer portion inside the wide portion, the vertical wall that is dominant in the frame strength is formed on the outer vertical wall and the inner side of the side frame. The vertical wall and the inner vertical surface of the suspension bracket located between them are triple-layered, and the inner vertical surface of the suspension bracket and the inner vertical wall of the side frame are integrally closed to the basic closed cross section of the side frame. The rear suspension strut mounting part is configured on the upper surface of the suspension bracket between the inner vertical surface of the suspension bracket and the outer vertical wall of the side frame, so that the input load of the rear suspension is outside the side frame. Effective from the vertical wall to the wheel apron, which is the vertical wall above it, and from the closed cross section along the inside of the strut attachment to the cross member. Are dispersed support, the strength of the strut attachment portion periphery, the rigidity is improved to a large width, can be reduced and improvement of steering stability of the vehicle body vibration noise. In addition, the closed cross section formed along the inner side of the strut attachment portion allows the side frame to pass through the front and rear without substantially breaking the shape of the basic closed cross section, so that the side frame has a structure that is unlikely to be twisted. It is possible to improve the overall strength, and it is possible to bring about a great effect in practical use.

In addition to the above structure, the suspension bracket has a lower joint surface that also serves as a side frame reinforcing doubler, and the suspension arm of the rear suspension is attached to the lap portion between the front and rear ends of the lower joint surface and the doubler. By installing the sub-frame for the sub-frame, it is possible to increase the mounting strength of the sub-frame without using special reinforcement parts, and the double frame provided in the general part of the side frame is divided into front and rear. If adopted, it is possible to bring about an effect that the plate thickness of the front and rear doublers can be changed and set according to different purposes.

[Brief description of drawings]

1A and 1B show a first embodiment of the present invention, wherein FIG. 1A is a perspective view showing a rear suspension mounting portion with a floor removed, and FIG. 1B is a sectional view taken along line BB of FIG.

FIG. 2 is a perspective view showing a second embodiment of the present invention, in which (A) is a rear suspension mounting portion with the floor removed and a part of the frame reinforcement is cut away;
Is a cross-sectional view taken along the line BB of (A), (C) is a side view showing a subframe attached state, and (D) is a cross-sectional view taken along D-D of (A).

[Explanation of symbols]

 1 floor 2 wheel apron 3 side frame 3a wide part 4 suspension bracket 5 doubler 6 frame reinforce 7 suspension bracket reinforce 8 cross member 9 strut 11 subframe 12 intermediate cylinder 13 bolt 31 outer vertical wall 32 inner vertical wall 33 lower surface 33a opening Part 41 Outer joining surface 42 Inner vertical surface 43 Upper surface 43a Mounting hole 44 Lower joining surface 51 Front doubler 52 Rear doubler

Claims (2)

[Scope of utility model registration request] 1. A portion of a side frame, which is fixedly joined to a lower surface of a side edge portion of a floor to form a closed cross section in a vehicle front-rear direction, is widened at a portion of the side frame facing the inside of the rear wheel apron and fixedly joined to a lower portion of the rear wheel apron. Forming a wide portion composed of an outer vertical wall and an inner vertical wall which bulges inwardly and bulges, and a lower surface, and the lower surface of the wide portion leaves a predetermined width portion along the inner vertical wall, The structure is such that the opening is formed by cutting out a part, and a suspension bracket consisting of an outer joint surface, an inner vertical surface, and an upper surface is joined and fixed to the outer vertical wall of the wide portion, and the lower end portion of the inner vertical surface is fixed. Is fixed to the lower surface of the wide portion by attaching the upper surface with the opening of the lower surface of the wide portion completely blocked by the upper portion of the wide portion. Inside vertical wall and bottom surface A closed cross-section portion that is integrally continuous with the closed cross-section portion of the side frame general portion before and after the wide portion is formed, and a mounting portion for the strut upper end portion of the rear suspension is provided on the upper surface of the suspension bracket. Rear suspension mounting structure for vehicles. 2. The vehicle rear suspension mounting structure according to claim 1, wherein the lower end of the inner vertical surface of the suspension bracket is joined and fixed to the lower surface of the wide portion along the inner vertical wall of the wide portion. The lower joint surface for integrally reinforcing the closed cross section is integrally formed, and the doubler joined and fixed to the lower surface of the side frame general portion before and after the wide portion is joined and fixed to at least the front and rear portions of the lower joint surface. A structure for a rear suspension mounting portion of a vehicle, wherein a subframe for mounting a suspension arm of a rear suspension is mounted on a joint fixing portion with a joint surface.