WO2021172241A1

WO2021172241A1 - Cab-mounted structure

Info

Publication number: WO2021172241A1
Application number: PCT/JP2021/006524
Authority: WO
Inventors: 幸彦西山
Original assignee: いすゞ自動車株式会社
Priority date: 2020-02-28
Filing date: 2021-02-22
Publication date: 2021-09-02
Also published as: JP2021133885A; CN115210131A; CN115210131B; JP7240641B2

Abstract

Each of left and right cab front support sections 20 secured to a body frame has a mount upper plate section 22 that supports the front section of a cab from below, a mount inner-side plate section 23 extending downward from a vehicle-widthwise inner-end edge of the mount upper plate section 22, and a mount outer-side plate section 24 extending downward from a vehicle-widthwise outer-side edge of the mount upper plate section 22. Each of left and right mount reinforcing members 21 has a reinforcing upper plate section 25 that overlaps the mount upper plate section 22 from above and is held between a cab suspension and the mount upper plate section 22, a reinforcing inner-side plate section 26 that bends and extends downward from the vehicle-widthwise inner-end edge of the reinforcing upper plate section 25 and faces the mount inner-side plate section 23 so as to overlap the same from the vehicle-widthwise inner side, and a reinforcing outer-side plate section 27 that bends and extends downward from the vehicle-widthwise outer-end edge of the reinforcing upper plate section 25 and faces the mount outer-side plate section 24 so as to overlap the same from the vehicle-widthwise outer side.

Description

Cab mount structure

This disclosure relates to the cab mount structure of the vehicle.

Patent Document 1 describes a cab mount structure that is attached to the upper part of the chassis frame and has a front mount portion that supports the front end portion of the cab from below. The front mount portion includes a lower bracket, an upper bracket, a link arm, and an air suspension. The lower bracket is fixed to the side member and the upper bracket is fixed to the cab frame. The link arm is arranged so as to extend in the front-rear direction, the front part of the link arm is rotatably connected to the upper part of the lower bracket, and the rear part of the link arm is rotatably connected to the lower part of the upper bracket. NS.

The air suspension cushions the vibration of the vehicle transmitted from the chassis frame to the cab via the front mount. The upper end of the air suspension is fixed to the lower surface of the upper bracket, and the lower end of the air suspension is fixed to the upper surface of the front portion of the link arm.

Japanese Patent Application Laid-Open No. 2018-24399

In the cab mount structure described in Patent Document 1, when the weight of the cab increases due to the high roof or the like and the load input from the cab to the upper surface of the front portion of the link arm (the upper surface of the cab front support portion) increases, the cab front support Deformation or breakage may occur in the portion, and the support rigidity of the cab may not be ensured.

The purpose of the present disclosure is to provide a cab mount structure capable of ensuring the support rigidity of the cab.

The cab mount structure of the first aspect of the present disclosure includes left and right cab front supports fixed to the vehicle body frame on both sides of the vehicle width direction, and left and right cab front supports fixed to the left and right cab front supports, respectively. It is provided with a mount reinforcing member. Each of the left and right cab front support portions includes a mount upper plate portion that supports the front portion of the cab from below via a cab suspension, and a mount inner plate portion that extends downward from the inner edge of the mount upper plate portion in the vehicle width direction. It has a mount outer plate portion extending downward from the vehicle width direction outer edge of the mount upper plate portion. Each of the left and right mount reinforcing members overlaps the mount upper plate from above, and is sandwiched between the cab suspension and the mount upper plate, and the reinforcing upper plate is below the inner edge of the reinforcing upper plate in the vehicle width direction. Reinforced inner plate that bends and extends to overlap the mount inner plate from the inside in the vehicle width direction, and bends and extends downward from the outer edge of the reinforcing upper plate in the vehicle width direction, and extends to the outer plate of the mount. It has a reinforcing outer plate portion that faces the vehicle so as to overlap from the outside in the vehicle width direction.

In the above configuration, since the reinforcing upper plate portion overlaps the mount upper plate portion from above, the plate thickness of the mount upper plate portion is substantially increased by the reinforcing upper plate portion. Since the reinforcing inner plate portion and the reinforcing outer plate portion are respectively bent from the inner edge of the reinforcing upper plate portion in the vehicle width direction and the outer edge in the vehicle width direction, the surface rigidity of the reinforcing upper plate portion is increased. Since the reinforced inner plate portion faces the mount inner plate portion from the inside in the vehicle width direction and the reinforced outer plate portion faces the mount outer plate portion from the outside in the vehicle width direction, the torsional load is applied from the cab. When input, the reinforced inner plate abuts the mount inner plate to transmit the load, and / or the reinforced outer plate abuts the mount outer plate to transmit the load and from the reinforced upper plate to the mount. The load input to the plate is reduced. Therefore, the cab front support portion can be efficiently reinforced by the mount reinforcing member, and the cab support rigidity can be ensured.

The second aspect of the present disclosure is the cab mount structure of the first aspect, wherein the reinforcing upper plate portion, the reinforcing inner plate portion, and the reinforcing outer plate portion are the mount upper plate portion, the mount inner plate portion, and the mount outer side. It is fixed to the plate part respectively.

In the above configuration, since each plate portion of the mount reinforcing member is fixed to each plate portion of the cab front support portion, the support rigidity of the cab can be further increased.

The third aspect of the present disclosure is the cab mount structure of the first or second aspect, which includes a connecting member extending in the vehicle width direction between the left and right cab front support portions. The connecting members connect the left and right cab front support portions by fixing the ends on both sides in the vehicle width direction to the reinforcing inner plate portions of the left and right mount reinforcing members.

In the above configuration, the twist of the cab is suppressed by the connecting member that connects the left and right cab front support portions. Since the load from the connecting member is not directly input to the cab front support portion but is input to the cab front support portion via the mount reinforcing member, the cab support rigidity can be further increased.

According to the cab mount structure of the present disclosure, the support rigidity of the cab can be ensured.

FIG. 1 is a perspective view of a cab mount structure according to an embodiment of the present disclosure. FIG. 2 is a side view of the cab mount structure as viewed from the outside in the vehicle width direction. FIG. 3 is a front view of the cab mount structure as viewed from the front. FIG. 4 is a perspective view of a main part of the cab mount structure. FIG. 5 is a perspective view of the cab front support portion and the mount reinforcing member. FIG. 6 is a plan view of the mount reinforcing member as viewed from above. FIG. 7 is a side view of the mount reinforcing member as viewed from the outside in the vehicle width direction. FIG. 8 is a front view of the mount reinforcing member as viewed from the front.

Hereinafter, one embodiment of the present disclosure will be described with reference to the drawings. In the figure, the arrow FR indicates the front of the vehicle, the arrow UP indicates the upper part of the vehicle, and the arrow IN indicates the inside in the vehicle width direction. In the following description, the front-rear direction means the front-rear direction of the vehicle, and the left-right direction means the left-right direction in a state of facing the front of the vehicle. Further, the vertical direction and the front-rear direction mean directions in a non-tilt state (normal state) in which the cab 5 is not tilted.

The vehicle 1 according to the present embodiment is a cab-over type vehicle in which the cab 5 is located substantially in front of the engine (not shown), and as shown in FIGS. 1 to 3, the vehicle body frame (chassis frame) 2 and the vehicle 1 , A cab 5, a cab front mount 6, and a cab rear mount (not shown). The cab front mounts 6 are arranged on the left and right sides of the lower front end of the vehicle 1, respectively, and the right side and the left side are configured in the same manner. Therefore, one (left side) cab front mount 6 will be described below, and the other The description of (right side) will be omitted as appropriate.

The vehicle body frame 2 is a ladder frame, and has a pair of left and right side members 3 (only the left side is shown in FIGS. 1 to 3) and a plurality of cross members 4 (front ends in FIGS. 1 to 3). Only the cross member is shown). The left and right side members 3 extend in the front-rear direction on both sides in the vehicle width direction, and each cross member 4 extends along the vehicle width direction to connect the left and right side members 3. The cab 5 is arranged above the front portion of the vehicle body frame 2.

The front part of the cab 5 is elastically supported by the vehicle body frame 2 via the cab front mount 6. The cab front mount 6 includes a lower bracket 10, an upper bracket 11, a link arm 12, an air suspension (cab suspension) 13, and a shock absorber 14, and is attached to the upper part of the front end of the vehicle body frame 2.

The lower bracket 10 integrally has a lower bracket lower portion 10L fixed to the side member 3 by a plurality of bolts 15 and a lower bracket upper portion 10U extending upward from the lower bracket lower portion 10L to the side member 3. The upper bracket 11 integrates an upper bracket upper portion 11U fixed to the lower end portion of the cab 5 by a plurality of bolts (not shown) and an upper bracket lower portion 11L extending downward from the rear end portion of the upper bracket upper portion 11U. To have. The lower end of the upper bracket lower portion 11L is located behind the upper end portion of the lower bracket upper portion 10U.

The link arm 12 extends in the front-rear direction between the upper end of the lower bracket upper portion 10U and the lower end of the upper bracket lower portion 11L. The front end portion of the link arm 12 is rotatably connected to the upper end portion of the lower bracket upper portion 10U by a connecting portion 16 such as a pin joint. The cab 5 at the time of tilting tilts with the connecting portion 16 as the rotation axis. The rear end portion of the link arm 12 is rotatably connected to the lower end portion of the upper bracket lower portion 11L by a connecting portion 17 such as a pin joint.

The air suspension 13 is vertically expandable and contractible between the upper bracket upper portion 11U and the lower bracket upper portion 10U, and the shock absorber 14 is vertically arranged between the upper bracket upper portion 11U and the front end portion of the link arm 12. The air suspension 13 and the shock absorber 14 are arranged so as to be expandable and contractible, and cushion the vibration of the vehicle 1 transmitted from the vehicle body frame 2 to the cab 2 via the cab front mount 6. The upper end of the air suspension 13 is fixed to the lower surface of the front end of the upper bracket upper portion 11U, and the lower end of the air suspension 13 is fixed to the upper surface of the front end of the link arm 12. The upper end of the shock absorber 14 is fixed to the side surface of the front end portion of the upper bracket upper portion 11U, and the lower end portion of the shock absorber 14 is rotatably supported on the side surface of the front end portion of the link arm 12 via the absorber lower bracket 18. Will be done.

The rear part of the cab 5 is elastically supported by the vehicle body frame 2 via a cabrier mount, and is unlockably locked to the vehicle body frame 2 by a cab block mechanism (not shown). When the lock of the cab block mechanism is released, the cab 5 can be tilted upward around the connecting portion 16.

As shown in FIGS. 1 to 4, the front end portions of the left and right link arms 12 constitute left and right cab front support portions 20 fixed to the vehicle body frame 2 on both sides in the vehicle width direction of the vehicle 1, and are left and right. A mount reinforcing member 21 is fixed to each of the cab front support portions 20 (see FIG. 4).

As shown in FIGS. 1 to 8, the cab front support portion 20 has a U-shaped cross section that opens downward, and integrally has a mount upper plate portion 22, a mount inner plate portion 23, and a mount outer plate portion 24. .. The mount upper plate portion 22 supports the front portion of the cab 5 from below via the air suspension 13. The mount inner plate portion 23 extends downward from the inner edge of the mount upper plate portion 22 in the vehicle width direction. The mount outer plate portion 24 extends downward from the outer edge of the mount upper plate portion 22 in the vehicle width direction and faces the mount inner plate portion 23 from the outside in the vehicle width direction. The upper end of the lower bracket upper portion 10U is inserted from below between the mount inner plate portion 23 and the mount outer plate portion 24, and is rotatably supported by the mount inner plate portion 23 and the mount outer plate portion 24 via the connecting portion 16. Will be done.

The mount reinforcing member 21 has a U-shaped cross section that opens downward, and integrally has a reinforcing upper plate portion 25, a reinforcing inner plate portion 26, and a reinforcing outer plate portion 27.

The reinforcing upper plate portion 25 overlaps the mount upper plate portion 22 from above, and the reinforcing upper plate portion 25 and the mount upper plate portion 22 are formed with bolt insertion holes 29 penetrating vertically. A bolt shaft (not shown) extending downward from the lower end of the air suspension 13 is inserted into the bolt insertion hole 29 from above, and a nut (not shown) is screwed into the bolt shaft from below the mount upper plate 22 to tighten the air suspension 13. As a result, the lower end of the air suspension 13 is fastened and fixed to the reinforcing upper plate portion 25 and the mount upper plate portion 22, and the reinforcing upper plate portion 25 is sandwiched between the lower end portion of the air suspension 13 and the mount upper plate portion 22.

The reinforcing inner plate portion 26 extends downward by bending downward from the inner edge of the reinforcing upper plate portion 25 in the vehicle width direction, faces the mount inner plate portion 23 so as to overlap from the inside in the vehicle width direction, and is opposed to the mount inner plate portion 23. Proximity or contact with the inner surface in the vehicle width direction. The reinforcing outer plate portion 27 extends downward by bending downward from the outer edge of the reinforcing upper plate portion 25 in the vehicle width direction, faces the mount outer plate portion 24 from the outside in the vehicle width direction, and faces the mount outer plate portion 24 so as to overlap with each other. Close to or in contact with the outer surface in the vehicle width direction.

The reinforcing upper plate portion 25, the reinforcing inner plate portion 26, and the reinforcing outer plate portion 27 are welded and fixed to the mount upper plate portion 22, the mount inner plate portion 23, and the mount outer plate portion 24, respectively. The distance from the reinforcing upper plate portion 25 to the lower end of the reinforcing inner plate portion 26 (the vertical length of the reinforcing inner plate portion 26) is the distance from the reinforcing upper plate portion 25 to the lower end of the reinforcing outer plate portion 27 (reinforcing outer plate portion). The reinforcing inner plate portion 26 faces the cab front support portion 20 in a wider range in the vertical direction than the reinforcing outer plate portion 27, which is longer than the vertical length of 27). The absorber lower bracket 18 is rotatably supported on the outer surface in the vehicle width direction of the lower portion of the mount outer plate portion 24 on which the reinforcing outer plate portion 27 does not face.

The left and right cab front support portions 20 are connected by a circular tubular torque tube (connecting member) 28 extending in the vehicle width direction. The left and right ends of the torque tube 28 are welded and fixed to the side surfaces (inner side surfaces in the vehicle width direction) of the reinforcing inner plate portions 26 of the left and right mount reinforcing members 21. The torque tube 28 is not limited to a circular tube and may have another shape.

According to the present embodiment, since the reinforcing upper plate portion 25 overlaps the mount upper plate portion 22 from above, the plate thickness of the mount upper plate portion 22 is substantially increased by the reinforcing upper plate portion 25. Since the reinforcing inner plate portion 26 and the reinforcing outer plate portion 27 are respectively bent from the inner edge in the vehicle width direction and the outer edge in the vehicle width direction of the reinforcing upper plate portion 25, they are reinforced by the bent portion (corner portion). The surface rigidity of the upper plate portion 25 is increased. The reinforcing inner plate portion 26 faces the mount inner plate portion 23 so as to overlap from the inside in the vehicle width direction, and the reinforcing outer plate portion 27 faces the mount outer plate portion 24 so as to overlap from the outside in the vehicle width direction. When a torsional load is input from the cab 5 during traveling, the reinforcing inner plate portion 26 abuts on the mount inner plate portion 23 to transmit the load, and / or the reinforcing outer plate portion 27 hits the mount outer plate portion 24. The load is transmitted in contact with the mount, and the load input from the reinforcing upper plate portion 25 to the mount upper plate portion 22 is reduced. Therefore, the cab front support portion 20 can be efficiently reinforced by the mount reinforcing member 21, and the support rigidity of the cab 5 can be ensured.

Since the

plate portions

25, 26, 27 of the mount reinforcing member 21 are fixed to the

plate portions

22, 23, 24 of the cab front support portion 20, the mount reinforcing member 21 is firmly fixed to the cab front support portion 20. The support rigidity of the cab 5 can be further increased.

Further, the twist of the cab 5 is suppressed by the torque tube 28 that connects the left and right cab front support portions 20. Since the load from the torque tube 28 is not directly input to the cab front support portion 20 but is input to the cab front support portion 20 via the mount reinforcing member 21, the load load on the cab front support portion 20 can be reduced. , The support rigidity of the cab 5 can be further increased.

Although the present disclosure has been described above based on the above-described embodiment, the present disclosure is not limited to the contents of the above-described embodiment, and can be appropriately modified without departing from the present invention. That is, it goes without saying that all other embodiments, examples, operational techniques, and the like made by those skilled in the art based on this embodiment are included in the category of the present invention.

This application is based on a Japanese patent application filed on February 28, 2020 (Japanese Patent Application No. 2020-033659), the contents of which are incorporated herein by reference.

The present disclosure can be applied to a vehicle that supports the front part of the cab from below via the cab suspension.

1 Vehicle 2 Body frame 3 Side member 4 Cross member 5 Cab 6 Cab front mount 10 Lower bracket 10U Lower bracket upper 10L Lower bracket lower 11 Upper bracket 11U Upper bracket upper 11L Upper bracket lower 12 Link arm 13 Air suspension (cab suspension)
14 Shock absorber 15

Bolts

16, 17 Connecting part 18 Absorber lower bracket 20 Cab front support part 21 Mount reinforcement member 22 Mount upper plate part 23 Mount inner plate part 24 Mount outer plate part 25 Reinforced upper plate part 26 Reinforced inner plate part 27 Reinforcement Outer plate 28 Torque tube (connecting member)
29 bolt insertion hole

Claims

Left and right cab front supports that are fixed to the vehicle body frame on both sides of the vehicle width direction,
The left and right mount reinforcing members, which are fixed to the left and right cab front support portions, respectively, are provided.
Each of the left and right cab front support portions includes a mount upper plate portion that supports the front portion of the cab from below via a cab suspension, and a mount inner plate that extends downward from the inner edge of the mount upper plate portion in the vehicle width direction. It has a portion and a mount outer plate portion extending downward from the vehicle width direction outer edge of the mount upper plate portion.
Each of the left and right mount reinforcing members overlaps the mount upper plate portion from above, and is sandwiched between the cab suspension and the mount upper plate portion in the vehicle width direction of the reinforcing upper plate portion and the reinforcing upper plate portion. The reinforcing inner plate portion that bends downward from the inner end edge and faces the mount inner plate portion from the inside in the vehicle width direction and the reinforcing upper plate portion that bends downward from the outer end edge in the vehicle width direction. A cab mount structure for a vehicle, characterized in that the outer plate portion of the mount is provided with a reinforcing outer plate portion that is opposed to the outer plate portion of the mount so as to overlap the outer plate portion in the vehicle width direction.
The cab mount structure according to claim 1.
The reinforcing upper plate portion, the reinforcing inner plate portion, and the reinforcing outer plate portion are fixed to the mount upper plate portion, the mount inner plate portion, and the mount outer plate portion, respectively. Cab mount structure.
The cab mount structure according to claim 1 or 2.
A connecting member extending in the vehicle width direction is provided between the left and right cab front supports.
The vehicle cab is characterized in that the left and right cab front support portions are connected by fixing the ends on both sides in the vehicle width direction to the reinforcing inner plate portions of the left and right mount reinforcing members. Mount structure.