WO2022113541A1

WO2022113541A1 - Vehicle suspension structure

Info

Publication number: WO2022113541A1
Application number: PCT/JP2021/037414
Authority: WO
Inventors: 裕亮山梨
Original assignee: 三菱自動車工業株式会社
Priority date: 2020-11-24
Filing date: 2021-10-08
Publication date: 2022-06-02
Also published as: JP7311056B2; JPWO2022113541A1

Abstract

In the present invention, a reinforcing plate is interposed between a bracket side surface portion and a side frame side surface portion on one side or both sides where a bracket lower surface portion is widened in a vehicle width direction, the reinforcing plate being joined to the side frame side surface portion and extending downward from the side frame side surface portion. The reinforcing plate: is disposed such that the lower end thereof opposes a site of the bracket lower surface portion, the site being made to be wider in the vehicle width direction than the side frame; and extends in the vehicle front-back direction along the bracket lower surface portion.

Description

Vehicle suspension structure

The present invention relates to a vehicle suspension structure.

A suspension arm whose one end is swingably attached to the side member in the vertical direction to support the axle at the other end, a bump rubber (bump rubber) provided on the upper part of the suspension arm, and a side frame located above the bump rubber. There is known a suspension structure including a bump bracket provided at the above-mentioned place and a receiving plate provided at the lower part of the bump bracket and to which a bump rubber can come into contact (see Patent Document 1).
In this suspension structure, when the suspension arm is swung upward when driving on a rough road, the bump rubber hits the bump bracket via the receiving plate to prevent the suspension arm and the side frame from directly colliding with each other, and the bump rubber. Is elastically deformed to alleviate the impact.
It should be noted that such a bump bracket and a bump rubber are applied to a suspension structure provided with a suspension arm as described above, and are also applied to various conventionally known suspension structures.
For example, it is also applied to a suspension structure in which the rear axle housing is supported by a leaf spring, in which case the bump bracket is provided at the bottom of the side frame and the bump rubber is provided at the top of the middle of the leaf spring.

Japanese Patent Application Laid-Open No. 2001-63614

By the way, when traveling on a rough road, a large load is repeatedly input to the bump bracket from the bump rubber, and it is necessary to secure the strength and rigidity of the bump bracket, which leads to an increase in size and weight of the bump bracket. There is room for improvement.
In addition, since a large load is repeatedly input from the bump bracket to the side frame, there is room for improvement in improving the durability of the side frame.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a suspension structure of a vehicle which is advantageous in reducing the size and weight while improving the durability of the bump bracket and the side frame. ..

In order to achieve the above object, one embodiment of the present invention includes a suspension member that supports the axle so as to be displaceable in the vertical direction with respect to the side frame, a bump rubber provided on the suspension member, and the bump rubber. It is a suspension structure of a vehicle including a bump bracket provided at the lower part of the side frame so as to be in contact with the vehicle, and the side frame includes a pair of side frame side portions located on both sides in the vehicle width direction and the pair. The bump bracket is provided with a side frame lower surface portion connecting the lower ends of the side frame side surface portions, and the bump bracket is a pair of bracket side surface portions facing the pair of side frame side surface portions and a lower side portion with respect to the side frame lower surface portion. It is provided with a bracket lower surface portion that faces apart from each other and connects the lower ends of the pair of bracket side surface portions, and the bracket lower surface portion is widened to one side or both sides in the vehicle width direction with respect to the side frame lower surface portion. In the width direction, between the side frame side surface portion on one side or both sides where the bracket lower surface portion is widened and the bracket side surface portion, the side frame side surface portion is joined and extends downward from the side frame side surface portion. A reinforcing plate is interposed, and the reinforcing plate is arranged so as to face a portion of the lower surface portion of the bracket whose lower edge is widened in the vehicle width direction with respect to the side frame, and the vehicle is arranged along the lower surface portion of the bracket. It is characterized by being extended in the anteroposterior direction.

According to one embodiment of the present invention, even if the bump rubber hits the lower surface portion of the bracket and a load is input to elastically deform the lower surface portion of the bracket when traveling on a rough road, the lower surface portion of the bracket is the lower edge of the reinforcing plate. Since it is possible to suppress the deformation of the lower surface portion of the bracket further upward by hitting the bump bracket, it is advantageous in improving the durability of the bump bracket.
In addition, the load input from the lower surface of the bracket to the lower edge of the reinforcing plate is dispersed through the joint between the reinforcing plate and the side surface of the side frame and transmitted to the side surface of the side frame, so that the load is concentrated on the side surface of the side frame. This is advantageous in improving the durability of the side frame.
Further, the size of the reinforcing plate is sufficient to be located at a position where the lower edge of the reinforcing plate faces the lower surface portion of the side frame in a state where the reinforcing plate is interposed between the side surface portion of the bracket and the side surface portion of the side frame. Since the reinforcing plate may be small and lightweight, it is advantageous in reducing the size and weight of the suspension structure.

It is a perspective view which shows the structure of the latter half of the vehicle to which the suspension structure of the vehicle which concerns on embodiment is applied. It is a side view which shows the structure of the latter half of the vehicle to which the suspension structure of the vehicle which concerns on embodiment is applied. It is a perspective view which looked at the part where the bump bracket and the reinforcing plate were attached to the side frame from the outside in the vehicle width direction. FIG. 3 is a cross-sectional view taken along the line AA of FIG.

Hereinafter, the suspension structure of the vehicle according to the embodiment of the present invention will be described with reference to the drawings.
In the following drawings, reference numeral FR indicates the front of the vehicle, reference numeral UP indicates the upper side of the vehicle, reference numeral IN indicates the inside in the vehicle width direction, and OUT indicates the outside in the vehicle width direction.

As shown in FIGS. 1 and 2, in the vehicle 10 to which the suspension structure 20 of the present invention is applied, a cabin (not shown) is mounted on a frame including a pair of side frames 12 and a plurality of

cross members

14, 16. It is a so-called frame car.
The pair of side frames 12 are arranged on both sides in the vehicle width direction and extend in the vehicle front-rear direction, and in the middle portion of the pair of side frames 12 in the extending direction, a kick-up portion that gradually rises toward the rear of the vehicle 12A is formed.
As shown in FIG. 4, the side frame 12 has a rectangular closed cross-sectional structure, and connects a pair of side frame side surface portions 1202 located on both sides in the vehicle width direction to the lower ends of the side frame side surface portions 1202. A side frame lower surface portion 1204 and a side frame upper surface portion 1206 connecting the upper ends of the side frame side surface portions 1202 are provided.
Of the pair of side frame side surface portions 1202, the side frame side surface portion 1202 on the inner side in the vehicle width direction is referred to as the inner side frame side surface portion 1202A, and the side frame side surface portion 1202 on the outer side in the vehicle width direction is referred to as the outer side frame side surface portion 1202B.

As shown in FIGS. 1 and 2, a plurality of

cross members

14 and 16 are arranged at intervals in the front-rear direction of the vehicle and connect a pair of side frames 12.
In the present embodiment, the plurality of cross members include a center cross member 14 connecting the kick-up portions 12A and a rear cross member 16 arranged behind the vehicle of the center cross member 14.

As shown in FIGS. 1 and 2, the suspension structure 20 suspends the rear axle housing 18 with respect to the vehicle body.
In this embodiment, the suspension structure 20 includes a pair of leaf springs 22, a pair of shock absorbers 24, a pair of bump rubbers 26, a pair of bump brackets 28, and a pair of reinforcing plates 30.
The pair of leaf springs 22 elastically support the axle with respect to the side frame 12 so as to be vertically displaceable. In other words, the pair of leaf springs 22 constitute a suspension member that supports the side frame 12 so that the axle can be displaced in the vertical direction.
The pair of leaf springs 22 absorb vibrations and impacts from the road surface by elastically deforming the pair of leaf springs 22. The pair of leaf springs 22 are arranged on both sides in the vehicle width direction, and are configured by stacking a plurality of leaf springs extending in the vehicle front-rear direction in the vertical direction.
The front end and the rear end of the leaf spring 22 are provided with eyeball portions (spring eyes) 22A and 22B, respectively, which form holes having an axial center in the vehicle width direction.
The shackle pin 32 formed of the bolt 32A is inserted into the hole of the eyeball portion 22A at the front end of the leaf spring 22. As a result, the eyeball portion 22A is attached to the lower portion of the kickup portion 12A near the front end via the shackle pin 32 and the spring bracket 34.
Therefore, the front end of the leaf spring 22 is swingably supported by the side frame 12 via the shackle pin 32.
As shown in FIGS. 1 and 2, the shackle link 36 is swingably provided on the outer side frame side surface portion 1202B facing the outer side in the vehicle width direction of the side frame 12 located behind the rear cross member 16. The eyeball portion 22B at the rear end of the leaf spring 22 is pivotally supported at the free end of the shackle link 36.

As shown in FIG. 1, the intermediate portion of the leaf spring 22 supports the tubular portions 1802 on both sides of the rear axle housing 18 in the vehicle width direction via the connector 38.
The connector 38 has, for example, a lower spring seat 40 which has a plate shape and is in contact with the lower portion of the tubular portion 1802 of the rear axle housing 18, and a lower spring seat 40 which stands up from the lower spring seat 40 and has a tubular portion 1802 of the rear axle housing 18 as a lower spring. It includes two square U-bolts 42 that are sandwiched from above and below by the seat 40 and the leaf spring 22.

As shown in FIGS. 1 and 2, the pair of shock absorbers 24 expand and contract to suppress the movement of the leaf spring 22, and are provided on both sides in the vehicle width direction, respectively.
The lower end of the shock absorber 24 is swingably connected to the tubular portion 1802 of the rear axle housing 18 located inside the leaf spring 22 in the vehicle width direction via a support shaft (not shown).
As shown in FIG. 2, the upper end of the shock absorber 24 is swingably connected to the side frame 12 via the support shaft 2402 at a position displaced forward or backward from the lower end of the shock absorber 24 in the vehicle front-rear direction. There is.

As shown in FIGS. 1 and 2, the pair of bump rubbers 26 are used when an excessive load is applied to the rear axle housing 18 from the road surface when traveling on a rough road and the intermediate portion of the leaf spring 22 is greatly bent upward. When the bump rubber 26 comes into contact with the lower part of the side frame 12, the leaf spring 22 is prevented from coming into direct contact with the lower part of the side frame 12 to alleviate the impact.
The bump rubber 26 is made of an elastic body such as rubber, is attached to the upper surface of the leaf spring 22 located between the two square U bolts 42, and is projected toward the lower surface portion 1204 of the side frame of the side frame 12. ing.
In the present embodiment, the bump rubber 26 is provided with its center offset outward in the vehicle width direction with respect to the intermediate position of the lower surface portion 1204 of the side frame in the vehicle width direction.

As shown in FIGS. 3 and 4, the pair of bump brackets 28 are provided at the lower part of the side frame 12 via the reinforcing plate 30, and the upper ends of the bump rubber 26 are configured to be in contact with each other.
The bump bracket 28 is made of sheet metal, and has a pair of bracket side surface portions 2802 facing the pair of side frame side surface portions 1202 and a pair of bracket side surface portions 2802 facing downward with respect to the side frame lower surface portion 1204. It is provided with a bracket lower surface portion 2804 for connecting the lower end of the bracket.
The bracket lower surface portion 2804 is wider than the side frame lower surface portion 1204 in one or both of the vehicle width directions. In the present embodiment, the lower surface portion 2804 of the bracket is widened to the outside in the vehicle width direction.
That is, the bracket lower surface portion 2804 of the bump bracket 28 is widened to the outside in the same vehicle width direction as the offset direction of the bump rubber 26.
Of the pair of bracket side surface portions 2802, the one facing the inner side frame side surface portion 1202A is referred to as the inner bracket side surface portion 2802A, and the side facing the outer side frame side surface portion 1202B is referred to as the outer bracket side surface portion 2802B.

The inner bracket side surface portion 2802A and the outer bracket side surface portion 2802B have a rectangular plate shape extending in the vehicle front-rear direction when viewed from the vehicle width direction.
The lengths of the inner bracket side surface portion 2802A and the outer bracket side surface portion 2802B along the vehicle front-rear direction are formed to have the same dimensions.
The height of the outer bracket side surface portion 2802B is formed to be larger than the height of the inner bracket side surface portion 2802A.
As shown in FIG. 1, the inner bracket side surface portion 2802A includes an inner bracket upper edge 2810 parallel to the bracket lower surface portion 2804 and an inner bracket leading edge 2812 extending downward from the front end of the inner bracket upper edge 2810 in front of the vehicle. , The inner bracket trailing edge 2814 extending downward from the trailing edge of the inner bracket upper edge 2810 at the rear of the vehicle, and the inner bracket lower edge 2816 connecting the lower end of the inner bracket leading edge 2812 and the lower edge of the inner bracket trailing edge 2814. ,have.
The inner bracket side surface portion 2802A is a portion overlapped with the inner side frame side surface portion 1202A, and the inner bracket upper edge 2810, the inner bracket leading edge 2812, and the inner bracket lower edge 2816 are on the inner side frame side surface portion 1202A. It is arc welded.

As shown in FIGS. 3 and 4, the outer bracket side surface portion 2802B is reinforced by a portion near the upper edge, which is separated upward from the corner portion 1210 where the outer side frame side surface portion 1202B and the side frame lower surface portion 1204 intersect. It is welded to the plate 30.
Further, the portion of the outer bracket side surface portion 2802B excluding the portion near the upper edge is formed as a curved portion 46 described later.

More specifically, the outer bracket side surface portion 2802B includes an outer bracket upper edge 2820 parallel to the bracket lower surface portion 2804, an outer bracket leading edge 2822 extending downward from the front end of the outer bracket upper edge 2820 in front of the vehicle, and a vehicle. A rear edge 2824 of the outer bracket extending downward from the trailing edge of the upper edge 2820 of the outer bracket at the rear, and a lower edge 2826 of the outer bracket connecting the lower end of the leading edge 2822 of the outer bracket and the lower edge of the trailing edge 2824 of the outer bracket. Have.
The outer bracket side surface portion 2802B includes a joint portion 44 and a curved portion 46.
The joint portion 44 is composed of a portion of the outer bracket side surface portion 2802B near the upper edge 2820 of the outer bracket.
Specifically, the joint 44 comprises an outer bracket upper edge 2820, an outer bracket leading edge upper 2822A that is the upper part of the outer bracket leading edge 2822, and an outer bracket trailing edge upper 2824A that is the upper part of the outer bracket trailing edge 2824. It is a place surrounded by, and is a place to be overlapped with the outer side frame side surface portion 1202B via the reinforcing plate 30 described later.
The outer bracket upper edge 2820, the outer bracket leading edge upper 2822A, and the outer bracket trailing edge upper 2824A are arc welded to the reinforcing plate 30.
The curved portion 46 is the remaining portion excluding the joint portion 44, and projects convexly in a direction away from the reinforcing plate 30 in the vehicle width direction when viewed from the front-rear direction of the vehicle.
In other words, the bracket side surface portion 2802 on one side or both sides in the vehicle width direction in which the bracket lower surface portion 2804 is widened is a joint portion 44 whose upper end portion is joined to the side frame side surface portion 1202.
In the present embodiment, the upper end portion of the outer bracket side surface portion 2802B is a joint portion 44 to be joined to the outer side frame side surface portion 1202B. The joint portion 44 is joined to the outer side frame side surface portion 1202B with the reinforcing plate 30 interposed therebetween.
In other words, in the bracket side surface portion 2802 (in the present embodiment, the outer bracket side surface portion 2802B) on one side or both sides in the vehicle width direction in which the bracket lower surface portion 2804 is widened, the portion below the joint portion 44 is the reinforcing plate 30. It is a curved portion 46 formed in a curved shape that bulges in a direction away from the above.

The reinforcing plate 30 is interposed between the side frame side surface portions 1202 on one side or both sides of which the bracket lower surface portion 2804 is widened in the vehicle width direction and the bracket side surface portion 2802.
In the present embodiment, the reinforcing plate 30 is interposed between the outer side frame side surface portion 1202B and the outer bracket side surface portion 2802B, and is joined to the outer side frame side surface portion 1202B and the outer bracket side surface portion 2802B. It extends downward from the side surface portion 1202.
The reinforcing plate 30 is made of sheet metal and has a reinforcing plate lower edge 3002 extending in the vehicle front-rear direction parallel to the side frame lower surface portion 1204 and a reinforcement extending in the vehicle front-rear direction facing the reinforcing plate lower edge 3002. The plate upper edge 3004, the reinforcing plate front edge 3006 connecting the front ends of the reinforcing plate upper edge 3004 and the reinforcing plate lower edge 3002 in the front of the vehicle, and the reinforcing plate upper edge 3004 and the reinforcing plate lower edge 3002 in the rear of the vehicle. It is provided with a reinforcing plate trailing edge 3008 to be connected.
The reinforcing plate 30 has a rectangular plate shape when viewed from the vehicle width direction. As shown in FIGS. 3 and 4, the center of the length of the outer bracket side surface portion 2802B in the vehicle front-rear direction coincides with the center of the length of the reinforcing plate 30 in the vehicle front-rear direction. Then, when viewed from the vehicle width direction, the outer bracket upper edge 2820 and the outer bracket leading edge upper 2822A are within the contour surrounded by the reinforcing plate upper edge 3004, the reinforcing plate leading edge 3006, and the reinforcing plate trailing edge 3008. And the upper part 2824A of the trailing edge of the outer bracket are arranged so as to be located.
The lower edge 3002 of the reinforcing plate is located at a position close to the lower surface portion 1204 of the side frame in the vertical direction. In the present embodiment, the lower edge 3002 of the reinforcing plate is located at a position slightly downwardly displaced from the lower surface portion 1204 of the side frame.
More specifically, the reinforcing plate 30 is arranged so that the lower edge 3002 of the reinforcing plate faces the portion where the lower edge 3002 of the reinforcing plate is widened in the vehicle width direction from the side frame 12 of the lower surface portion 2804 of the bracket, and the reinforcing plate 30 is arranged along the lower surface portion 2804 of the bracket. It extends in the front-rear direction of the vehicle.
Further, the lower edge 3002 of the reinforcing plate is close to the lower surface portion 2804 of the bracket with a gap.
Further, the reinforcing plate 30 is extended downward in the vertical direction in a state of being overlapped along the outer side frame side surface portion 1202B.

The reinforcing plate 30 is joined to the outer side frame side surface portion 1202B by welding, and the welded portion intersects the outer side frame side surface portion 1202B at the lower end of the outer side frame side surface portion 1202B and the side frame lower surface portion 1204. It is said to be located upward from the corner.
In the present embodiment, the welded portion of the reinforcing plate 30 is formed on the entire area of the reinforcing plate upper edge 3004, the reinforcing plate front edge portion 3006A which is the portion of the reinforcing plate front edge 3006 near the reinforcing plate upper edge 3004, and the reinforcing plate. It is composed of a reinforcing plate trailing edge portion 3008A, which is a portion of the reinforcing plate trailing edge 3008 near the edge 3004, and these welded portions are arc-welded to the outer side frame side surface portion 1202B by arc welding.
That is, the portion where the reinforcing plate leading edge 3006 and the reinforcing plate trailing edge 3008 are welded to the outer side frame side surface portion 1202B is upward from the corner portion 1210 where the outer side frame side surface portion 1202B and the side frame lower surface portion 1204 intersect. is seperated.
In other words, of the reinforcing plate leading edge 3006 and the reinforcing plate trailing edge 3008, the portion closer to the reinforcing plate lower edge 3002 is a portion that is not welded to the side frame side surface portion 1202.

Here, the length of the portion where the edge portion of the reinforcing plate 30 and the outer side frame side surface portion 1202B are welded, and the portion where the edge portion of the outer bracket side surface portion 2802B and the reinforcing plate 30 are arc-welded. The relationship between lengths will be explained.
As shown in FIG. 3, the portion of the outer bracket side surface portion 2802B located above the lower edge 3002 of the reinforcing plate when viewed from the vehicle width direction is located inside the contour of the reinforcing plate 30. Specifically, the joint portion 44 of the outer bracket side surface portion 2802B joined to the reinforcing plate 30 when viewed from the vehicle width direction is located inside the contour of the reinforcing plate 30 and is overlapped with the reinforcing plate 30.
Therefore, the length L1 of the first welded region where the reinforcing plate upper edge 3004 is arc-welded to the outer side frame side surface portion 1202B is the length of the second welded region where the outer bracket upper edge 2820 is arc-welded to the reinforcing plate 30. It is larger than L2.
Further, the length L3 of the third welded region in which the leading edge portion 3006A of the reinforcing plate is arc-welded to the side surface portion 1202B of the outer side frame is the fourth welded region in which the upper portion 2822A of the leading edge of the outer bracket is arc-welded to the reinforcing plate 30. It is larger than the length L4.
Similarly, the length L5 of the fifth welded region in which the trailing edge portion 3008A of the reinforcing plate is arc-welded to the side surface portion 1202B of the outer side frame is the sixth welded region in which the upper portion 2824A of the trailing edge of the outer bracket is arc-welded to the reinforcing plate 30. Is larger than the length L6.

Next, the action and effect will be described.
When a vertical load is applied from the rear axle housing 18 to the middle portion of the leaf spring 22 when traveling on a rough road, the front end and the rear end of the leaf spring 22 are supported by the shackle pin 32 and the shackle link 36, so that the leaf spring 22 is elastically deformed so that the intermediate portion bends upward or downward.
When the upward load input to the middle portion of the leaf spring 22 exceeds a certain value, the upper end of the bump rubber 26 abuts on the lower surface portion 2804 of the bracket to prevent the leaf spring 22 and the side frame 12 from directly colliding with each other. However, the impact is alleviated by the elastic deformation of the bump rubber 26.
At this time, when the load from the upper end of the bump rubber 26 is input to the bracket lower surface portion 2804, the bracket lower surface portion 2804 is elastically deformed upward, and the load is applied from the inner bracket side surface portion 2802A to the inner side frame side surface portion 1202A. The load is transmitted from the outer bracket side surface portion 2802B to the outer side frame side surface portion 1202B via the reinforcing plate 30.
As described above, in the present embodiment, the center of the bump rubber 26 is provided so as to be offset outward in the vehicle width direction with respect to the intermediate position of the side frame lower surface portion 1204 in the vehicle width direction, and the bump bracket 28 is provided. The lower surface portion 2804 of the bracket is widened to the outside in the same vehicle width direction as the offset direction of the bump rubber 26.
Therefore, as shown in FIG. 4, the portion of the bracket lower surface portion 2804 where the leaf spring 22 greatly bends when traveling on a rough road and the upper end of the bump rubber 26 abuts, that is, the input point P of the load F is the bracket lower surface portion 2804. It is a location that is displaced outward in the vehicle width direction from the center in the vehicle width direction. Therefore, the load from the bump rubber 26 is input to the portion of the lower surface portion of the bracket 2804 that is closer to the outside in the vehicle width direction, but the lower surface portion 2804 of the bracket is widened to the outside in the same vehicle width direction as the offset direction of the bump rubber 26. Therefore, the load from the bump rubber 26 is stably input to the lower surface portion 2804 of the bracket.

In the present embodiment, the bracket lower surface portion 2804 is widened outward in the vehicle width direction with respect to the side frame lower surface portion 1204. Between the outer side frame side surface 1202B and the outer bracket side surface 2802B, which is the side where the bracket lower surface 2804 is widened in the vehicle width direction, it is joined to the outer side frame side surface 1202B and is below the outer side frame side surface 1202B. A reinforcing plate 30 extending to is interposed. The lower edge of the reinforcing plate 30 is arranged so as to face a portion of the bracket lower surface portion 2804 that is wider in the vehicle width direction than the side frame 12, and is extended in the vehicle front-rear direction along the bracket lower surface portion 2804. There is.
Therefore, even if the bump rubber 26 hits the lower surface portion 2804 of the bracket and a load is input to elastically deform the lower surface portion 2804 of the bracket upward when traveling on a rough road, the lower surface portion 2804 of the bracket is the lower edge of the reinforcing plate 30 (under the reinforcing plate). By abutting on the edge 3002), further upward deformation of the lower surface portion 2804 of the bracket can be suppressed.
Therefore, by suppressing the amount of deformation of the bracket lower surface portion 2804, it is advantageous in improving the durability of the bump bracket 28.
Further, the load input from the lower surface portion 2804 of the bracket to the lower edge 3002 of the reinforcing plate is distributed to the outer side frame side surface portion 1202B through the joint portion between the reinforcing plate 30 and the outer side frame side surface portion 1202B, and is transmitted to the outer side frame side portion 1202B. Since the load concentration on the frame side surface portion 1202B can be suppressed, it is advantageous in improving the durability of the side frame 12.
Further, the size of the reinforcing plate 30 is such that the reinforcing plate 30 is interposed between the outer bracket side surface portion 2802B and the outer side frame side surface portion 1202B, and the reinforcing plate lower edge 3002 faces the side frame lower surface portion 1204. The reinforcing plate 30 can be small and lightweight, as long as it is sufficient to be located at the location where the reinforcing plate 30 is formed.
Therefore, it is advantageous in reducing the size and weight of the suspension structure.

Further, in the present embodiment, the lower edge of the reinforcing plate 30 (the lower edge of the reinforcing plate 3002) is close to the lower surface portion 2804 of the bracket with a gap. Therefore, when the bump rubber 26 hits the lower surface portion 2804 of the bracket, the elastic deformation of the lower surface portion 2804 of the bracket is allowed by the gap between the lower edge 3002 of the reinforcing plate and the lower surface portion 2804 of the bracket. It can be absorbed and relaxed, which is advantageous in improving the riding comfort when traveling on rough roads.
Further, it is advantageous in efficiently preventing the bump bracket 28 from being deformed while suppressing the abnormal noise generated by the lower edge of the reinforcing plate 30 rubbing against the lower surface portion 2804 of the bracket during traveling.

Further, in the present embodiment, the reinforcing plate 30 is extended downward in the vertical direction in a state of being overlapped along the outer side frame side surface portion 1202B.
Therefore, the load received by the reinforcing plate 30 can be more efficiently transmitted to the side frame 12, which is advantageous in preventing the deformation of the bracket lower surface portion 2804 more reliably, and also suppresses the deformation of the reinforcing plate 30 itself. It is also advantageous in doing so.

Further, in the present embodiment, the outer bracket side surface portion 2802B on the outer side in the vehicle width direction in which the bracket lower surface portion 2804 is widened is a joint portion 44 whose upper end portion is joined to the outer side frame side surface portion 1202B. The joint portion 44 is joined to the outer side frame side surface portion 1202B with the reinforcing plate 30 interposed therebetween.
Therefore, the rigidity of the portion of the outer side frame side surface portion 1202B to which the outer bracket side surface portion 2802B is joined is improved by the reinforcing plate 30. Therefore, it is advantageous for the outer side frame side surface portion 1202B to receive the load input via the outer bracket side surface portion 2802B, and it is advantageous for suppressing the deformation of the outer side frame side surface portion 1202B.

Further, in the present embodiment, the joint portion 44 is located inside the contour of the reinforcing plate 30 when viewed from the vehicle width direction.
Therefore, the load input from the upper end of the bump rubber 26 to the lower surface portion 2804 of the bracket is from the joint portion 44 of the outer bracket side surface portion 2802B to the outer side frame side surface portion via the reinforcing plate 30 having a contour larger than that of the joint portion 44. It is efficiently dispersed in 1202B.
Therefore, it is possible to prevent the load from being concentrated on the outer side frame side surface portion 1202B and causing the outer side frame side surface portion 1202B to be significantly deformed, which is advantageous in improving the durability of the side frame 12.

Further, in the present embodiment, the outer bracket side surface portion 2802B on the outer side in the vehicle width direction in which the bracket lower surface portion 2804 is widened has a curved shape in which a portion below the joint portion 44 bulges in a direction away from the reinforcing plate 30. It is formed.
Therefore, when the upper end of the bump rubber 26 abuts on the lower surface portion 2804 of the bracket, the curved portion (curved portion 46) of the outer bracket side surface portion 2802B is elastically deformed to absorb and mitigate the impact. It is more advantageous in improving the riding comfort during running.

Further, in the present embodiment, the reinforcing plate 30 is joined to the outer side frame side surface portion 1202B by welding. The welded portion is located at a position upwardly separated from the corner portion 1210 where the lower end of the outer side frame side surface portion 1202B and the side frame lower surface portion 1204 intersect.
Therefore, when the load input from the upper end of the bump rubber 26 to the lower surface portion 2804 of the bracket is transmitted from the side surface portion 2802B of the outer bracket to the side surface portion 1202B of the outer side frame via the reinforcing plate 30, the load is transmitted to the side surface portion 1202B of the side frame 12. Since the concentrated application to the corner portion 1210 is suppressed, it is advantageous in improving the durability of the side frame 12.

Further, in the present embodiment, the center of the bump rubber 26 is provided so as to be offset to the outside in the vehicle width direction with respect to the intermediate position of the side frame lower surface portion 1204 in the vehicle width direction. In the bump bracket 28, the lower surface portion 2804 of the bracket is widened to one side in the same vehicle width direction as the offset direction of the bump rubber 26.
Therefore, even when the center of the bump rubber 26 is offset to the outside in the vehicle width direction, the load is stably input from the upper end of the bump rubber 26 to the lower surface portion 2804 of the bracket, so that the durability of the bump bracket 28 is durable. It is advantageous in improving the sex.
In the present embodiment, the case where the center of the bump rubber 26 is offset to the outside in the vehicle width direction has been described, but when the center of the bump rubber 26 is offset to the inside in the vehicle width direction, the lower surface portion of the bracket is described. The 2804 may be widened inward in the same vehicle width direction as the offset direction of the bump rubber 26, and in that case, the same effect as that of the embodiment is obtained.

Further, in the present embodiment, the lengths L1, L3, and L5 of the first, third, and fifth welded regions where the edge portion of the reinforcing plate 30 and the outer side frame side surface portion 1202B are arc-welded are set to the outer bracket. The edges of the side surface portion 2802B and the reinforcing plate 30 are secured to be larger than the lengths L2, L4, and L6 of the second, fourth, and sixth welded regions in which the reinforcing plates 30 are arc-welded.
Therefore, the load input from the upper end of the bump rubber 26 to the lower surface portion 2804 of the bracket and transmitted from the side surface portion 2802B of the outer bracket to the reinforcing plate 30 is the wide first between the edge portion of the reinforcing plate 30 and the side surface portion 1202 of the side frame. It is efficiently dispersed in the outer side frame side surface portion 1202B via the third and fifth welding regions.
Therefore, it is possible to prevent the load from being concentrated on the outer side frame side surface portion 1202B and causing the outer side frame side surface portion 1202B to be significantly deformed, which is advantageous in improving the durability of the side frame 12.

In the present embodiment, the load input point from the upper end of the bump rubber 26 is displaced to the outside in the vehicle width direction from the center of the lower surface portion 2804 of the bracket in the vehicle width direction, and the bump rubber 26 is used. The case where the load is input to the lower surface portion 2804 of the bracket near the outside in the vehicle width direction has been described.
However, on the contrary, the input point of the load from the upper end of the bump rubber 26 is displaced inward in the vehicle width direction from the center of the lower surface portion 2804 in the vehicle width direction, and the load from the bump rubber 26 Of course, the present invention is also applicable to the case where is input to the lower surface portion of the bracket 2804 toward the inside in the vehicle width direction.
In that case, the reinforcing plate 30 is interposed between the inner side frame side surface portion 1202A and the inner bracket side surface portion 2802A by welding, and the curved portion 46 is formed on the inner side frame side surface portion 1202A. The same action and effect as above are achieved.

Further, in the present embodiment, the bracket lower surface portion 2804 is widened to the outside which is one side in the vehicle width direction with respect to the side frame lower surface portion 1204, and the bracket lower surface portion 2804 is the outer side which is the widened side in the vehicle width direction. A case where a reinforcing plate 30 joined to the outer side frame side surface portion 1202B and extending downward from the outer side frame side surface portion 1202B is interposed between the frame side surface portion 1202B and the outer bracket side surface portion 2802B has been described.
However, the bracket lower surface portion 2804 is widened inward on one side in the vehicle width direction from the side frame lower surface portion 1204, and the inner side frame side surface portion 1202A and the inner side in which the bracket lower surface portion 2804 is widened in the vehicle width direction. A reinforcing plate 30 joined to the inner side frame side surface portion 1202A and extending downward from the inner side frame side surface portion 1202A may be interposed between the bracket side surface portion 2802A.
Alternatively, the bracket lower surface portion 2804 is widened on both the inner and outer sides in the vehicle width direction, and between the outer side frame side surface portion 1202B and the outer bracket side surface portion 2802B, the inner side frame side surface portion 1202A, and the inner bracket side surface portion 2802A. Reinforcing plates 30 may be interposed in both the space and the space.
It goes without saying that the same effect as that of the embodiment is obtained even in such a configuration.

Further, in the present embodiment, the bump rubber 26 is provided with its center offset to the outside in the vehicle width direction (or the inside in the vehicle width direction) with respect to the intermediate position in the vehicle width direction of the lower surface portion 1204 of the side frame. However, the present invention is of course applicable even when the center of the bump rubber 26 coincides with the intermediate position of the lower surface portion 1204 of the side frame in the vehicle width direction.

In the present embodiment, the present invention is applied to a leaf spring type suspension structure in which a pair of leaf springs 22 are used as suspension members that support the side frame 12 so that the axle can be displaced in the vertical direction. explained.
However, the present invention can be widely applied to suspension structures other than the leaf spring type, for example, various conventionally known suspension structures such as a torsion beam type suspension and a rigid axle type suspension.

This application is based on Japanese patent application 2020-194113 filed on November 24, 2020, the contents of which are incorporated herein by reference.

10 Vehicle 12 Side frame 1202 Side frame side frame 1202A Inner side frame side surface 1202B Outer side frame side surface 1204 Side frame lower surface 1206 Side frame upper surface 1210 Square 18 Rear axle housing 20 Suspension structure 22 Leaf spring (suspension member)
24 Shock Absorber 26 Bump Rubber 28 Bump Bracket 2802 Bracket Side 2802A Inner Bracket Side 2810 Inner Bracket Leading Edge 2812 Inner Bracket Leading Edge 2814 Inner Bracket Trailing Edge 2816 Inner Bracket Lower Edge 2802B Outer Bracket Side 2820 Outer Bracket Upper Edge 2822 Outer Bracket Leading Edge 2822A Outer Bracket Leading Edge Upper 2824 Outer Bracket Trailing Edge 2824A Outer Bracket Trailing Edge Upper 2826 Outer Bracket Lower Edge 2804 Bracket Bottom 30 Reinforcing Plate 3002 Reinforcing Plate Lower Edge 3004 Reinforcing Plate Leading Edge 3006 Reinforcing Plate Leading Edge 3006A Reinforcing Plate Leading edge part 3008 Reinforcing plate trailing edge 3008A Reinforcing plate trailing edge part 34 Spring bracket 44 Joint part 46 Curved part

Claims

A suspension member that supports the axle so that it can be displaced in the vertical direction with respect to the side frame, a bump rubber provided on the suspension member, and a bump bracket provided on the lower portion of the side frame so as to be in contact with the bump rubber. The suspension structure of the vehicle equipped with,
The side frame includes a pair of side frame side surfaces located on both sides in the vehicle width direction, and a side frame lower surface portion connecting the lower ends of the pair of side frame side surface portions.
The bump bracket is a bracket that connects a pair of bracket side surface portions facing the pair of side frame side surface portions and a lower end portion of the pair of bracket side surface portions facing downward with respect to the side frame lower surface portion. With a lower surface
The lower surface portion of the bracket is widened to one side or both sides in the vehicle width direction with respect to the lower surface portion of the side frame.
Between the side frame side surface portion on one side or both sides of which the lower surface portion of the bracket is widened in the vehicle width direction and the bracket side surface portion, the side frame side surface portion is joined to be below the side frame side surface portion. An extending reinforcing plate is provided
The reinforcing plate is arranged so as to face a portion of the lower surface portion of the bracket whose lower edge is widened in the vehicle width direction with respect to the side frame, and extends in the vehicle front-rear direction along the lower surface portion of the bracket. The suspension structure of the vehicle is characterized by that.
The vehicle suspension structure according to claim 1, wherein the lower edge of the reinforcing plate is brought close to the lower surface portion of the bracket with a gap.
The vehicle suspension structure according to claim 1 or 2, wherein the reinforcing plate is extended downward in the vertical direction in a state of being overlapped along the side surface portion of the side frame.
The bracket side surface portion on one side or both sides in the vehicle width direction in which the lower surface portion of the bracket is widened is a joint portion whose upper end portion is joined to the side frame side surface portion.
The vehicle suspension structure according to any one of claims 1 to 3, wherein the joint portion is joined to the side frame side surface portion with the reinforcing plate sandwiched between the joint portions.
The vehicle suspension structure according to claim 4, wherein the joint portion is located inside the contour of the reinforcing plate when viewed from the vehicle width direction.
The bracket side surface portions on one side or both sides in the vehicle width direction in which the bracket lower surface portion is widened are formed in a curved shape in which a portion below the joint portion bulges in a direction away from the reinforcing plate. The vehicle suspension structure according to claim 4 or 5.
The reinforcing plate is joined to the side frame side surface portion by welding, and the welded portion is formed from a corner portion where the side frame side surface portion at the lower end of the side frame side surface portion and the side frame lower surface portion intersect. The vehicle suspension structure according to any one of claims 1 to 6, wherein the suspension structure is located above and away from the vehicle.
The center of the bump rubber is provided so as to be offset to either one side in the vehicle width direction with respect to the intermediate position of the lower surface portion of the side frame in the vehicle width direction.
The vehicle suspension structure according to any one of claims 1 to 7, wherein the bump bracket has a lower surface portion thereof widened to one side in the same vehicle width direction as the offset direction of the bump rubber. ..