JP6215662B2 - Leaf spring support structure - Google Patents

Description

  The present invention relates to a leaf spring support structure that supports a leaf spring on a vehicle body frame, and more particularly to a leaf spring support structure that reduces manufacturing costs and shares components.

  As shown in FIG. 1, a suspension of a vehicle such as a truck or a bus is known in which a leaf spring 3 is supported on a body frame 1 via a spring bracket 2. In the figure, C is a cab and T is a wheel. Such a spring bracket 2 is roughly classified into a rubber bush type and a metal bush type. The rubber bush type spring bracket 2 is suitable for a low axle heavy vehicle and has a relatively simple structure. Therefore, a sheet metal structure suitable for mass production and inexpensive in manufacturing cost is generally used. On the other hand, the metal bush type spring bracket 2 is widely used in high-axle heavy vehicles.

  2 (a) and 2 (b) show an outline of a conventional metal bush type spring bracket 2. FIG. The spring bracket 2 has a frame attachment portion 2a attached to the vehicle body frame 1 and a pin support portion 2b to which a support pin 4 for the leaf spring 3 is attached. The frame attachment portion 2a and the pin support portion 2b Are integrally formed by casting (see Patent Document 1). A mounting hole 6 for bolting or riveting the frame mounting portion 2a to the vehicle body frame 1 is formed in the frame mounting portion 2a. On the other hand, the pin support part 2b has the pin support piece 7 spaced apart in the vehicle width direction.

  A pin hole 8 (see FIG. 3) is formed through the pin support piece 7 in the vehicle width direction, and a support pin 4 (see FIG. 4) for the leaf spring 3 is inserted into the pin hole 8. As shown in FIG. 1, the support pin 4 for the leaf spring 3 includes a support pin 4 directly attached to the front end of the leaf spring 3 and a support attached to the rear end of the leaf spring 3 via a shackle 9. Pin 4 is also included. A slit 10 is formed in the pin support piece 7 from the pin hole 8 to the lower end, and a bolt insertion hole 11 is formed in the vehicle longitudinal direction so as to intersect the pin hole 8 by 90 degrees.

  According to the spring bracket 2, with the support pin 4 inserted into the pin hole 8, the bolt 12 is inserted into the bolt insertion hole 11, the nut 14 is tightened into the bolt shaft portion 13, and the pin support piece 7 is attached to the front and rear of the vehicle. By tightening from the direction and narrowing the slit 10, the support pin 4 can be fastened and fixed to the pin hole 8. The bolt insertion hole 11 is formed in the pin support piece 7 so that a part of the bolt 12 protrudes into the pin hole 8, and the support pin 4 is a recess into which the bolt 12 protruding from the pin hole 8 is fitted. 15 is formed. When the bolt 12 is fitted in the recess 15, the support pin 4 is prevented from coming off from the pin hole 8.

Japanese Patent Laid-Open No. 11-78456

  By the way, in the conventional spring bracket 2 described above, as shown in FIG. 3, the pin support piece 7 is formed with a pin hole 8 along the vehicle width direction and intersects the pin hole 8 by 90 degrees. Bolt insertion holes 11 are formed in the longitudinal direction of the vehicle, and high accuracy is required for each hole diameter and hole position. For this reason, after casting the spring bracket 2, it is necessary to cut the pin hole 8 and the bolt insertion hole 11, which causes an increase in cost. In particular, since the pin hole 8 and the bolt insertion hole 11 intersect each other by 90 degrees and partially overlap, drilling cannot be performed at the same time, requiring two steps, resulting in an increase in cost.

  Further, as shown in FIGS. 2 (a) and 2 (b), the conventional spring bracket 2 has the frame mounting portion 2a and the pin support portion 2b integrally formed by casting, so that the body frame 1 is attached. Therefore, there is room for improvement from the viewpoint of sharing parts.

  An object of the present invention, which was created in view of the above circumstances, is to provide a leaf spring support structure that can reduce manufacturing costs and share components.

  According to the present invention created to achieve the above-described object, a leaf spring support structure for supporting a leaf spring on a vehicle body frame, a pair of support plates arranged at intervals in the vehicle width direction, and these A bent portion formed at a lower portion of the support plate and bent inward and then bent upward; a pin hole formed through the support plate in the vehicle width direction and through which a leaf spring support pin is inserted; A bracket body having a slit formed from the pin hole to the lower end of the support plate, a support plate attachment portion attached between the support plates and a vehicle body frame attachment portion attached to the vehicle body frame, and a bracket body And a bolt insertion space surrounded by the support plate mounting portion, the support plate and the bent portion. The bolt is inserted into the bolt insertion space and protrudes from the support plate. By tightening the nut on the shank of the bolt, fastening the support plate from the vehicle longitudinal direction, to fix the support pin by narrowing the slit, the leaf spring support structure is provided, characterized in that.

The rear part in the vehicle front-rear direction of the support plate mounting part of the bracket body is positioned in front of the rear part of the support plate , and the front part in the vehicle front-rear direction of the support plate attachment part of the bracket body is behind the front part of the support plate. The bolt head and nut may be in contact with the front and rear portions of the support plate and spaced from the front and rear portions of the support plate mounting portion of the bracket body.

  You may provide the welding part which joins bending parts to the lower part of a bending part.

  Inclined portions may be formed inward on the top surfaces of the bent portions, and these inclined portions may be bolt receivers having a V-shaped cross section.

  The bracket body has a first bracket made of sheet metal and a second bracket made of sheet metal, a part of the first bracket and a part of the second bracket are superposed, and the superposed part is a support plate attaching part. As described above, a notch for inserting the support pin may be formed in the overlapped portion of the first and second brackets by being inserted between the support plates and welded.

The leaf spring support structure according to the present invention can exhibit the following effects.
(1) Since a bent portion bent inwardly in a J-shape is formed at the lower part of the pair of support plates, and a bolt insertion space is formed using the inner surface of the support plate and the top surface of the bent portion. There is no need to cut the bolt insertion hole, and the processing cost can be reduced.
(2) A support plate having a bent portion and a pin hole can be manufactured by sheet metal. Therefore, by press working, it can be easily mass-produced as compared with casting, and the manufacturing cost can be reduced.
(3) Since the support plate is attached to the vehicle body frame via the bracket main body, if the bracket main body is changed according to the attachment position to the vehicle body frame or the vehicle type, it can be attached without changing the support plate. . Therefore, the support plate can be shared even if the mounting position to the body frame and the vehicle type are different, and the cost of tools such as a mold can be suppressed.

It is a side view which shows a vehicle body frame and the leaf spring attached to it. It is explanatory drawing of the spring bracket which shows a prior art example, (a) is a side view of the spring bracket attached to the vehicle body frame, (b) is the II sectional view taken on the line of (a). It is a principal part perspective view of the spring bracket shown in FIG. It is explanatory drawing of a support pin and the volt | bolt which fixes it, (a) is a side view of a support pin and a volt | bolt, (b) is a front view of a support pin. It is explanatory drawing of the leaf spring support structure which concerns on one Embodiment of this invention, (a) is a side view of the leaf spring support structure attached to the vehicle body frame, (b) is II-II sectional view taken on the line of (a). It is. It is the III-III sectional view taken on the line of FIG.5 (b). It is a perspective view of a pair of support plate shown in FIG. It is explanatory drawing of the single support plate shown in FIG. 5, (a) is a side view of a support plate, (b) is a front view.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiment are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

(Outline of leaf spring support structure 16)
A leaf spring support structure 16 according to an embodiment of the present invention will be described with reference to FIGS. 5A is a side view showing a state in which the leaf spring support structure 16 according to the present embodiment is attached to the vehicle body frame 1, FIG. 5B is a cross-sectional view taken along the line II-II in FIG. 5 is a sectional view taken along line III-III in FIG. 5B, FIG. 7 is a perspective view of a pair of support plates 17 shown in FIG. 5, and FIG. 8A is a side view of the single support plate 17 shown in FIG. FIG. 8B is a front view of the single support plate 17.

  As shown in FIGS. 5A and 5B, the leaf spring support structure 16 according to this embodiment includes a pair of support plates 17 arranged at intervals in the vehicle width direction, and these support plates 17. A bent portion 18 bent inwardly in a J-shape, a pin hole 19 penetratingly formed in the support plate 17 in the vehicle width direction, and extending from the pin hole 19 to the lower end of the support plate 17. A slit 20, a bracket body 21 for attaching the support plate 17 to the vehicle body frame 1, and a bolt insertion space 22 surrounded by the bracket body 21, the support plate 17, and the bent portion 18 are provided. In the leaf spring support structure 16, the bolt 12 is inserted into the bolt insertion space 22 in a state where the support pin 4 for the leaf spring 3 is inserted into the pin hole 19, and the nut 14 is inserted into the bolt shaft portion 13 protruding from the support plate 17. The support plate 17 is tightened from the vehicle front-rear direction, and the slit 20 is narrowed to fix the support pin 4.

(Support plate 17, pin hole 19)
A pair of support plates 17 shown in FIGS. 7, 8 (a), and 8 (b) are arranged at intervals in the vehicle width direction, and pin holes 19 penetrate the support plate 17 in the vehicle width direction. Is formed. A support pin 4 for the leaf spring 3 is inserted into the pin hole 19. In the present embodiment, the upper portion of the support plate 17 is formed in an arc shape, but may be a square shape.

(Bend 18)
A bent portion 18 is formed at the lower portion of the support plate 17, which is bent inward and then bent back 180 degrees upward. The top surface of the bent portion 18 forms a bolt insertion space 22 in cooperation with the inner surface of the support plate 17 and the like. Inclined portions 26 are chamfered inwardly on the top surfaces of the bent portions 18 by coining or the like, and these inclined portions 26 are bolt receivers 27 having a V-shaped cross section. The bent portions 18 on the left and right in the vehicle width direction are in contact with each other.

  A welded portion 25 that joins the bent portions 18 to each other is provided below the bent portion 18. As shown in FIGS. 5 (a) and 5 (b), the welded portion 25 tightens the nut 14 to the shaft portion 13 of the bolt 12 inserted into the bolt insertion space 22, and moves the support plate 17 from the vehicle longitudinal direction. When tightened and bent, the left and right bent portions 18 in the vehicle width direction are prevented from separating in the vehicle width direction. The welding part 25 is formed in the lower part of the bending part 18 along the vehicle front-back direction.

(Slit 20)
As shown in FIGS. 7 and 8A, the support plate 17 has a slit 20 extending from the pin hole 19 to the lower end of the support plate 17. As shown in FIGS. 5A and 5B, the slit 20 is formed by tightening the nut 14 into the shaft portion 13 of the bolt 12 inserted into the bolt insertion space 22 so that the support plate 17 is moved in the vehicle longitudinal direction. The support pin 4 for the reel spring 3 that is narrowed as it is tightened and inserted into the pin hole 19 is clamped and fixed.

  The support plate 17 having the slit 20, the bent portion 18, and the pin hole 19 is manufactured by sheet metal (pressing). Therefore, when the support plate 17 is pressed, by forming the slit 20, the bent portion 18, and the pin hole 19, it can be easily mass-produced as compared with casting, and the manufacturing cost can be reduced. The pin hole 19 may be cut to improve accuracy after being punched and processed during press working or after welding assembly. The slit 20 may be cut after the support plate 17 is pressed.

  The left and right support plates 17 in the vehicle width direction shown in FIG. 7 are arranged in a pair in the vehicle width direction with the same shape including the slit 20, the bent portion 18 and the pin hole 19 facing each other. Therefore, it can manufacture by a common press work using a common metal mold | die, and can promote cost reduction.

(Bracket body 21)
As shown in FIGS. 5A and 5B, the support plate 17 is attached to the vehicle body frame 1 via a bracket body 21. The bracket body 21 includes a support plate attachment portion 28 attached between the support plates 17 and a vehicle body frame attachment portion 29 attached to the vehicle body frame 1. The bracket body 21 includes a first bracket 30 made of sheet metal and a second bracket 31 made of sheet metal.

  As shown in FIGS. 5A, 5B, and 6, the first bracket 30 connects a pair of vertical wall portions 32 spaced apart in the vehicle width direction and the upper portion of the vertical wall portion 32. And a transverse wall portion 33 that is formed in a U-shaped cross-section with the lower portion open. The lateral wall portion 33 of the first bracket 30 is joined to the vehicle body frame 1 by rivets or bolts and nuts. The vehicle body frame 1 has a pair of side members 34 that are formed in a U-shaped cross section and extend in the vehicle front-rear direction. The side members 34 have an upper flange 35 and a lower flange 36 that are horizontally disposed, and these are vertically connected. The web 37 is connected in the direction, and the lateral wall 33 of the first bracket 30 is joined to the lower flange 36 of the vehicle body frame 1 by rivets or bolts and nuts. A mounting hole (not shown) is formed in the lower flange 36 and the lateral wall portion 33.

  As shown in FIGS. 5A and 5B, the second bracket 31 includes a lower portion 38 welded to the vertical wall portion 32 on the outer side in the vehicle width direction of the first bracket 30, and upward from there. And an upper portion 39 that is attached to the vehicle body frame 1. The lower portion 38 of the second bracket 31 and the vertical wall portion 32 of the first bracket 30 that overlaps the lower portion 38 are joined by a welded portion 40. An attachment hole 41 for bolting or riveting the web bracket 37 to the web 37 of the body frame 1 is formed in the upper part 39 of the second bracket 31.

  As shown in FIG. 5B, the vertical wall portion 32 on the outer side in the vehicle width direction of the first bracket 30 and the lower portion 38 of the second bracket 31 are overlapped, and the overlap portion 42 serves as a support plate mounting portion 28 as a support plate. 17 is inserted and welded. In Fig.5 (a), 43 is a welding part. As shown in FIG. 5B, a cutout portion 44 for inserting the support pin 4 is formed in the overlapping portion 42 of the first and second brackets 30 and 31 (see FIG. 6). The plate thickness of the first bracket 30 and the plate thickness of the second bracket 31 are set equal to the plate thickness of the support plate 17, for example, and are 7 mm in this embodiment. Thereby, the contact area with respect to the hole of the support pin 4 can be equivalent to 28 mm, which is four times the single plate thickness 7 mm, and the support load per unit area of the support pin 4 can be reduced as much as possible.

  As shown in FIG. 5B, a plate body 45 having a plate thickness (7 × 3 = 21 mm) that is three times that of the first bracket 30 is welded to the vertical wall portion 32 on the inner side in the vehicle width direction. A pin hole 46 through which the support pin 4 is inserted is formed there. Thereby, the contact area with respect to the hole of the support pin 4 in the vertical wall portion 32 on the inner side in the vehicle width direction ensures a plate thickness equivalent to 28 mm, similarly to the outer side in the vehicle width direction.

(Bolt insertion space 22)
As shown in FIG. 5B, the leaf spring support structure 16 according to this embodiment is surrounded by the lower surface of the support plate mounting portion 28 of the bracket body 21, the inner surface of the support plate 17, and the top surface of the bent portion 18. A bolt insertion space 22 is provided. As shown in FIG. 5A, the bolt insertion space 22 is formed along the vehicle front-rear direction so as to be orthogonal to the pin hole 19 through which the support pin 4 is inserted. The bolt 12 is inserted into the bolt insertion space 22, and the nut 14 is fastened to the bolt shaft portion 13 protruding from the support plate 17, whereby the support plate 17 is tightened from the vehicle front-rear direction and the slit 20 is narrowed to support the support pin 4. Can be fixed.

  The bolt 12 inserted into the bolt insertion space 22 is placed on a bolt receiver 27 formed on the top surface of the bent portion 18 as shown in FIG. The bolt receiver 27 is formed on the top surface of the bent portion 18 so that a part of the bolt 12 protrudes into the pin hole 19 as shown in FIG. On the other hand, as shown in FIG. 4, the support pin 4 has a recess 15 into which the bolt 12 protruding from the pin hole 19 is fitted. Accordingly, the support pin 4 is inserted into the pin hole 19 with the recess 15 facing downward, and the bolt 12 is inserted into the bolt insertion space 22, so that the bolt 12 fits into the recess 15 of the support pin 4. The pin hole 19 is prevented from coming off.

As shown in FIG. 6, the rear portion 50 of the support plate mounting portion 28 of the bracket main body 21 in the vehicle front-rear direction is positioned in front of the rear portion 51 of the support plate 17, and the vehicle front and rear of the support plate mounting portion 28 of the bracket main body 21. The front part 52 in the direction is located behind the front part 53 of the support plate 17. Accordingly, the head 54 of the bolt 12 inserted into the bolt insertion space 22 and the nut 14 tightened to the bolt shaft portion 13 are in contact with the front portion 53 and the rear portion 51 of the support plate 17, and support the bracket body 21. The plate attachment portion 28 is separated from the front portion 52 and the rear portion 50. As a result, when the bolt 12 and the nut 14 are tightened, the tightening force mainly acts on the support plate 17 and hardly acts on the support plate mounting portion 28 of the bracket body 21. The support plate 17 can be efficiently sandwiched and bent from the vehicle front-rear direction by the insertion force, and the support pin 4 can be fixed by narrowing the slit 20. A washer may be disposed on the lower surface of the bolt head 54 and the lower surface of the nut 14.

(Action / Effect)
According to the leaf spring support structure 16 according to the present embodiment shown in FIGS. 5 to 8, the bent portion 18 bent inwardly in a J shape is formed at the lower part of the pair of support plates 17. Since the bolt insertion space 22 is formed using the inner surface and the top surface of the bent portion 18, it is not necessary to cut the bolt insertion hole, and the processing cost can be reduced. That is, in the conventional spring bracket 2 shown in FIGS. 2 and 3, it is necessary to cut the pin hole 8 and the bolt insertion hole 11 which are orthogonal to each other, but in this embodiment, it is necessary to cut the bolt insertion hole. The processing cost can be reduced.

  The support plate 17 having the bent portion 18, the slit 20, and the pin hole 19 shown in FIGS. 8A and 8B can be manufactured by sheet metal. Therefore, by press working, it can be easily mass-produced as compared with casting, and the manufacturing cost can be reduced. The bent portion 18 of the support plate 17 is bent and formed at the time of pressing, and the pin hole 19 and the slit 20 of the support plate 17 are punched and formed at the time of pressing. The pin hole 19 may be punched and then machined to increase the accuracy of the hole surface. Moreover, you may manufacture the slit 20 by cutting after press work.

  As shown in FIG. 5B, the pair of support plates 17 are attached to the vehicle body frame 1 via the bracket body 21, so that the bracket body 21 is changed according to the attachment position to the vehicle body frame 1 and the vehicle type. If it does, it can respond to attachment, without changing the support plate 17. FIG. Therefore, even if the attachment position to the vehicle body frame 1 and the vehicle type are different, the pair of support plates 17 can be shared, and tool costs such as molds can be suppressed.

  As shown in FIG. 5A, when the nut 14 is fastened to the shaft portion 13 of the bolt 12, the head 54 and the nut 14 of the bolt 12 are connected to the front portion 53 of the support plate 17 and the nut 14 as shown in FIG. Since it is in contact with the rear portion 51 and is separated from the front portion 52 and the rear portion 50 of the support plate mounting portion 28 of the bracket body 21, the tightening force of the bolt 12 and the nut 13 mainly acts on the support plate 17, It hardly acts on the support plate mounting portion 28 of the bracket body 21. Therefore, the support plate 17 can be sandwiched and bent from the vehicle front-rear direction with a relatively small tightening force, and the support pin 4 can be fixed efficiently by narrowing the slit 20.

  As shown in FIGS. 5B and 7, since the bent portions 18 formed on the pair of support plates 17 are joined by the welded portions 25, the bolts 12 and the nuts 14 are tightened to fix the support plate 17. When bent and tightened from the vehicle front-rear direction, the bent portions 18 can be prevented from separating in the vehicle width direction. Accordingly, the tightening force of the bolts 12 and nuts 14 can be applied in a concentrated manner in the vehicle longitudinal direction without being dispersed in the vehicle width direction, and the slits 20 can be efficiently narrowed to fix the support pins 4.

  As shown in FIGS. 7, 8 (a), and 8 (b), inclined portions 26 are formed inwardly on the top surface of the bent portion 18, and the inclined portions 26 are bolt receivers 27 having a V-shaped cross section. Therefore, the bolt 12 inserted into the bolt insertion space 22 can be stably and accurately placed in the center of the V-shaped groove of the bolt receiver 27 by the action of gravity.

  As shown in FIG. 5B, in the leaf spring support structure 16, the bracket body 21 for attaching the support plate 17 to the vehicle body frame 1 is composed of the first and second brackets 30 and 31 made of sheet metal. Since all parts including the support plate 17 are made of sheet metal, cost reduction can be promoted.

  Further, the vertical wall portion 32 of the first bracket 30 and the lower portion 38 of the second bracket 31 are overlapped and welded, the overlapped portion 42 is inserted between the support plates 17 and welded, and a support pin is attached to the overlapped portion 42. A notch 44 for 4 (see FIG. 6) is formed. As a result, the support pin 4 inserted into the pin hole 19 has a notch 44 formed in the overlapping portion 42 of the first and second brackets 30 and 31 in addition to the pin hole 19 formed in the pair of support plates 17. The contact area with respect to the hole of the support pin 4 can be earned as much as possible. Therefore, as the leaf spring support structure 16 of the metal bush structure, the support load of the support pin 4 per unit area can be reduced as much as possible, and the durability can be improved.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments, and various modifications within the scope of the claims. Needless to say, examples and modifications also belong to the technical scope of the present invention. For example, the support pin 4 for the leaf spring 3 includes a support pin 4 attached to the leaf spring 3 via a shackle 9 in addition to the support pin 4 attached directly to the leaf spring 3. Further, in the above-described embodiment, as shown in FIG. 5B, the example in which the leaf spring support structure 16 of the present invention is arranged on the outer side in the vehicle width direction is shown, but it may be arranged on the inner side in the vehicle width direction. , May be arranged on both sides.

  The present invention can be used in a leaf spring support structure that supports a leaf spring on a vehicle body frame.

DESCRIPTION OF SYMBOLS 1 Body frame 3 Leaf spring 4 Support pin 12 Bolt 13 Bolt axial part 14 Nut 16 Leaf spring support structure 17 Support plate 18 Bending part 19 Pin hole 20 Slit 21 Bracket main body 22 Bolt insertion space 25 Welding part 26 Inclining part 27 Bolt receptacle 28 Support plate attachment portion 29 Body frame attachment portion 30 First bracket 31 Second bracket 42 Overlapping portion 44 Notch portion 50 Rear portion 51 of support plate attachment portion of the bracket body in the vehicle front-rear direction Support plate rear portion 52 Support plate attachment portion of the bracket body Vehicle front-rear direction front portion 53 support plate front portion 54 bolt head

Claims (5)

A leaf spring support structure for supporting a leaf spring on a body frame,
A pair of support plates arranged at intervals in the vehicle width direction;
A bent portion formed at the bottom of these support plates, bent inward and then bent upward and bent;
A pin hole formed through the support plate in the vehicle width direction, through which a support pin for a leaf spring is inserted;
A slit formed from the pin hole to the lower end of the support plate;
A bracket body having a support plate attachment portion attached between the support plates and having a vehicle body frame attachment portion attached to the vehicle body frame;
A support plate mounting portion of the bracket body, a bolt insertion space surrounded by the support plate and the bent portion,
A bolt is inserted into the bolt insertion space, and a nut is fastened to a shaft portion of the bolt protruding from the support plate, whereby the support plate is tightened from the vehicle front-rear direction and the slit is narrowed to fix the support pin. A leaf spring support structure characterized by that. The rear portion of the bracket body support plate mounting portion in the vehicle front-rear direction is positioned forward of the rear portion of the support plate,
The front part in the vehicle front-rear direction of the support plate mounting part of the bracket body is located behind the front part of the support plate ,
2. The leaf according to claim 1, wherein the head portion of the bolt and the nut are in contact with a front portion and a rear portion of the support plate, and are separated from a front portion and a rear portion of the support plate mounting portion of the bracket body. Spring support structure.   The leaf spring support structure according to claim 1, wherein a welded portion that joins the bent portions to each other is provided at a lower portion of the bent portion. On the top surface of the bent portion, an inclined portion is formed inwardly,
The leaf spring support structure according to any one of claims 1 to 3, wherein the inclined portions are bolt receivers having a V-shaped cross section. The bracket body includes a first bracket made of sheet metal and a second bracket made of sheet metal,
A part of the first bracket and a part of the second bracket are superposed, and the superposed part is inserted between the support plates as the support plate attachment part and welded,
The leaf spring support structure according to any one of claims 1 to 4, wherein a cutout portion for inserting the support pin is formed in the overlapping portion of the first and second brackets.

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