JPH04310478A - Connecting structure of body to frame of vehicle equipped with frame - Google Patents

Abstract

PURPOSE:To provide a connecting structure of a body to a frame of a vehicle equipped with a frame which can remarkably reduce the amount of vibration transmitted from a road surface or the like to the body. CONSTITUTION:A frame 14 is divided into the first frame 16 and the second frame, and the first frame 16 and a body 12 are rigidly connected to each other by connecting protions 22, 24, 28, 30. The second frame 18 and the body 12 are vibro-isolating supported at support portions 42, 44, 46 by a vibro-isolating rubber mount. The first frame 16 and the second frame 18 are connected to each other at a connecting portion 47 by a vibro-isolating bush. Accordingly, the vibration from a road surface in the periphery of a rear suspension including a leaf spring 20 is absorbed by the vibro-isolating rubber mount and the vibro- isolating rubber bush, so that the amount of vibration transmitted from the second frame 18 to the body can be remarkably reduced.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for connecting a vehicle body and a frame, in which a body is attached to a frame.

0002

2. Description of the Related Art Conventionally, vehicles such as trucks and buses have a structure in which a body is attached to a frame, forming a so-called frame-equipped vehicle. There are various types of connection structures between the frame and the body in such frame-equipped vehicles. Explain.

A frame 104 to which the body 102 of the bus 100 is attached is a so-called ladder-type frame, and a leaf spring 106, which is an elastic vibrating body, is disposed on the rear side of the frame 104.

[0004] Further, approximately half of the body 102 on the vehicle front side and approximately half of the frame 104 on the vehicle front side have a four-point support structure by four connecting portions 108, 110, 112, and 114. These coupling parts 108, 110,
112 and 114 are rigidly connected. body 102
Approximately half of the frame 104 on the rear side of the vehicle and approximately half of the frame 104 on the rear side of the vehicle have a three-point support structure with three support parts 116, 118, and 120. These support parts 11
6, 118, and 120 are supported in a vibration-proof manner. and,
The vehicle rear end of the body 102 and the vehicle rear end of the frame 104 are supported at one point by a joint 122 at one location. This joint portion 122 is a rigid joint. That is, in this bus 100, the body 102 and frame 104 around the attachment point of the leaf spring 106
This is a vibration-proof support structure, and the body 102 and the frame 104 in approximately the front half of the vehicle excluding the area around the attachment point of the leaf spring 106 and the rear end of the vehicle are rigidly coupled to each other.

[0005]

However, according to this structure, the support parts 116, 118, 1 which are supported by vibration isolation
The vibration of the frame 104 at 20 increases. Therefore, this vibration is transmitted to the entire frame 104, and the vibration of the frame 104 becomes particularly large near the coupling portion 122 at the rear end of the vehicle. Therefore, vibrations are transmitted from the frame 104 to the body 102 via the coupling parts 108, 110, 112, 114, and 122. Therefore, each panel constituting the body 102 vibrates, which causes noise inside the vehicle and causes the floor and seats to vibrate.

[0006] In consideration of the above facts, an object of the present invention is to obtain a structure for connecting the body and frame of a frame-equipped vehicle, which can significantly reduce the amount of vibrations transmitted to the body from the road surface, etc.

[0007]

[Means for Solving the Problems] The present invention provides a connection structure between a vehicle body and a frame, which is constructed by attaching a body to a frame, and wherein the frame is attached to a first portion located at an intermediate portion in the longitudinal direction of the vehicle and located on the front side of the vehicle. The frame and the second part on the rear side of the vehicle.
the first frame and the vehicle front side portion of the body are rigidly coupled, the second frame and the vehicle rear side portion of the body are supported by a first vibration isolator, and the first frame and the vehicle rear side portion of the body are supported by a first vibration isolator. The first frame and the second frame are connected by a second vibration isolating material.

[0008]

[Operation] According to the above configuration, since the second frame and the vehicle rear side portion of the body are supported by the first vibration isolating material, vibrations from the road surface, etc. in the vertical direction of the vehicle are transmitted to the second frame. Even if the vehicle is moved vertically, this vibration in the vertical direction of the vehicle is considerably absorbed by the first vibration isolating material. Therefore, the amount of vibration transmitted in the vertical direction of the vehicle from the second frame to the vehicle rear side portion of the body is significantly reduced. In addition, since the second frame and the first frame are connected by the second vibration isolator, vibrations from the road surface, etc. in the vehicle longitudinal direction or vehicle width direction are considerably absorbed by the second vibration isolator. . Therefore, the amount of vibration transmitted from the second frame to the first frame in the vehicle longitudinal direction or vehicle width direction is significantly reduced. The reduced vibration is transmitted from the first frame to the vehicle front side portion of the body, but the amount is so small that it does not affect the body. As a result, the amount of vibration transmitted from the road surface to the body in the vehicle vertical direction, vehicle longitudinal direction, and vehicle width direction is significantly reduced.

Moreover, since the first frame and the body are rigidly connected, the relative movement between the entire frame and the body is less than when the first frame, the second frame, and the body are all provided with a vibration-proof support structure. (lateral vibration) can be reduced.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a schematic diagram of a bus 10 to which a frame-equipped vehicle body-frame connection structure according to the present invention is applied. In addition, the arrow FR side shown suitably in this figure etc. shows the vehicle front side, and the arrow UP side shows the vehicle upper side, respectively. The body 12 of this bus 10 is attached to a so-called ladder-shaped frame 14. This frame 14 is divided at an intermediate portion in the longitudinal direction of the vehicle. Hereinafter, the frame on the front side of the vehicle will be referred to as the first frame 16, and the frame on the rear side of the vehicle will be referred to as the second frame 18. The first frame 16 is a first side frame 16 that is disposed on both sides in the vehicle width direction and whose longitudinal direction is the vehicle longitudinal direction.
A and these first side frames 16A, the first cross member 16 spans along the vehicle width direction at multiple locations.
B (see FIG. 2). 2nd frame 1
8 is also configured in the same manner as the first frame 16, and includes a pair of second side frames 18A and a second frame (not shown).
It consists of cross members.

A leaf spring 20 is disposed on the vehicle lower side of the second frame 18, and the rear suspension including this leaf spring 20 is attached to the bus 1.
This is the main source of vibration at 0. Note that the leaf spring 20 prevents relatively large vibrations from the road surface (hereinafter referred to as
This is called the "first displacement input." ) has been absorbed to some extent.

The first frame 16 and approximately half of the body 12 on the front side of the vehicle are connected to connecting portions 22 provided at five locations;
24, 26, 28, and 30. Therefore, the first frame 16 and approximately half of the body 12 on the vehicle front side have a five-point support structure. These joints 2
2, 24, 26, 28, and 30, a rigid mount 32 shown in FIG. 2 is used. The rigid mount 32 is
A channel-shaped bracket 34 is mounted on the end surface of the first cross member 16B on the vehicle upper side, and this bracket 34 and the first cross member 16B are connected to the washer 36.
It is configured by being fastened with bolts 38 and nuts 40 via. Therefore, the first frame 16 and approximately half of the vehicle front side of the body 12 are rigidly connected by the rigid mount 32 at these connecting portions 22, 24, 26, 28, and 30.

The second frame 18 and approximately half of the body 12 on the rear side of the vehicle support portions 42 and 44 provided at three locations.
, 46. Therefore, the second frame 18 and approximately half of the body 12 on the vehicle rear side have a three-point support structure. Note that the support portions 42, 44, and 46 are arranged so that the leaf springs 20 in the second frame 18
Two supporting portions 42 and 44 are arranged directly above the attachment point, and the remaining supporting portion 46 is arranged at the end of the second frame 18 on the vehicle rear side.

These support parts 42, 44, and 46 are provided with a vibration-proof rubber mount 4 as a first vibration-proof material shown in FIG.
8 is used. The vibration-proof rubber mount 48 is inserted into a through hole (not shown) provided in the second side frame 18A of the second frame 18. The anti-vibration rubber mount 48 includes a substantially cylindrical cylindrical body 50. Cylindrical body 5
0 has a locking part 50A formed by slightly bending one end in the axial direction (the end on the upper side of the vehicle) in the radial direction. It is used for abutment and locking when inserted into the through hole of the second side frame 18A. A second side frame 18A is fixed to the outer peripheral surface of this cylindrical body 50.

A small-diameter, cylindrical collar 52 is arranged concentrically at the axial center of the cylinder 50. These cylinders 5
A mounting rubber 54 having an anti-vibration function is filled between the inner peripheral surface of the collar 52 and the outer peripheral surface of the collar 52. The mounting rubber 54, the cylindrical body 50, and the collar 52 are firmly adhered to each other to prevent them from peeling off. Further, a bolt 56 is inserted into the collar 52. A floor panel 60 on the body 12 side is disposed between the washer 58 of the bolt 56 and one end of the collar 52 in the axial direction (the end on the upper side of the vehicle). A plate-shaped stopper 62 is disposed in contact with the other end of the collar 52 in the axial direction (the end on the lower side of the vehicle). A stopper rubber 64 is fixed to the peripheral edge of the stopper 62, and is used to abut the other axial end surface of the cylinder 50 (the end surface on the lower side of the vehicle). With this stopper 62 in place, a nut 68 is screwed onto the bolt 56 and tightened. Therefore, the second frame 18 and approximately half of the body 12 on the rear side of the vehicle are attached to the anti-vibration rubber mount 48 by means of these support parts 42, 44, and 46.
It is supported with anti-vibration.

Second side frame 1 of second frame 18
8A and the first side frame 16A of the first frame 16 are connected by a connecting portion 47. The connecting portion 47 uses a vibration-proofing rubber bushing 70 as a second vibration-proofing material shown in FIG. The anti-vibration rubber bush 70 is
It is inserted into a through hole (not shown) formed at the end of the first side frame 16A on the vehicle rear side. This anti-vibration rubber bush 70 is the anti-vibration rubber mount 4 described above.
8, and includes a cylindrical tube portion 72 whose axial direction is in the longitudinal direction of the vehicle. Although not shown in FIG. 4, the first frame 1
6 first side frames 16A are fixed. Further, a small-diameter, cylindrical collar 7 is provided at the axis of the cylindrical portion 72.
4 are arranged concentrically, and a rubber mounting 76 having an anti-vibration function is filled between the inner circumferential surface of the cylindrical portion 72 and the outer circumferential surface of the collar 74. A bolt (not shown) having the same configuration as the anti-vibration rubber mount 48 is inserted inside the collar 74, and one end in the axial direction (the end on the rear side of the vehicle) is connected to the second frame 18 via a washer. A second side frame 18A is disposed, and a stopper to which a stopper rubber for abutting the cylindrical portion 72 is fixed is disposed at the other end in the axial direction (the end on the front side of the vehicle). The bolts and nuts are not tightened.

The operation of this embodiment will be explained below. Note that the vibration generation source of the bus 10 is mainly the leaf spring 2.
Since the area around the rear suspension includes 0, below, we will explain what kind of transmission path the vibrations from around the rear suspension in the vehicle vertical direction, vehicle longitudinal direction, and vehicle width direction are transmitted. , the operation of this embodiment will be explained.

Large displacement inputs from the road surface etc. are effectively absorbed by the leaf springs 20.

Next, when vibration in the vertical direction of the vehicle, which is not a large displacement input, is applied to the bus 10 from the road surface or the like, this vibration is transmitted to the second frame 18. Therefore, the second frame 1
8 is subjected to vibration in the vertical direction of the vehicle, but the second frame 1
Vibration in the vertical direction of the vehicle received by 8 is handled by anti-vibration rubber mount 4.
8 is absorbed considerably. As a result, the amount of vibration transmitted to the body 12 in the vertical direction of the vehicle is significantly reduced.

Furthermore, when vibrations from the road surface or the like are applied to the bus 10 in the vehicle longitudinal direction or the vehicle width direction, this vibration is also transmitted to the second frame 18. Therefore, although the second frame 18 is subjected to vibrations in the vehicle longitudinal direction or the vehicle width direction, the second frame 18
Vibrations received by the frame 18 in the longitudinal direction of the vehicle are considerably absorbed by the anti-vibration rubber bushing 70. Therefore, even if the vibration absorbed by the anti-vibration rubber bushing 70 is transmitted to the first frame 16, the amount of vibration is very small, and the vibration is transmitted to the body 12 via the rigid mount 32 in the vehicle longitudinal direction or vehicle width. The amount of vibration transmitted in the direction is significantly reduced.

As a result, vibrations from the road surface in the vertical direction of the vehicle, vibrations in the longitudinal direction of the vehicle, or vibrations in the vehicle width direction are hardly transmitted to the body 12.

Moreover, since the first frame 16 is rigidly connected to approximately the front half of the body 12 by the rigid mount 32, relative movement (lateral vibration) between the first frame 16 and the body 12 is prevented. do not have. That is, in this embodiment, the frame 14 has a divided structure, and the first frame 16 has a function to prevent the entire frame 14 from shaking laterally, and the second frame 18 has a function to greatly absorb vibrations from the road surface, etc. The functions are divided between each.

As described above, in this embodiment, the frame 14 is divided into the first frame 16 and the second frame 18, and the first frame 16 and the second frame 18 are connected by the anti-vibration rubber bushing 70. 2 frames 18 and body 12
Approximately half of the rear side of the vehicle is anti-vibration supported by the anti-vibration rubber mount 48, so that the amount of vibration transmitted to the body 12 from the road surface around the rear suspension can be significantly reduced.

Furthermore, since the first frame 16 is rigidly connected to approximately the front half of the body 12 by the rigid mount 32, the first frame 16 and the body 12 do not move relative to each other. Therefore, the frame 14 as a whole
It becomes possible to suppress the relative movement between the body 12 and the body 12 to a small value.

Furthermore, in this embodiment, the first frame 16
Since the first frame 16 and the second frame 18 are connected to each other by the anti-vibration rubber bushing 70 near the joint 30 that rigidly connects the first frame 16 and the body 12, it is possible to improve the joint rigidity at this part. can. Therefore, when a large displacement input is applied to the rear suspension, this large displacement input can be suppressed to some extent. Further, this effect can also be obtained by appropriately changing the structure of the anti-vibration rubber bushing 70 that connects the first frame 16 and the second frame 18; in other words, the anti-vibration rubber bushing 70
0 between the first frame 16 and the second frame 18 allows for room for design changes. Furthermore, the anti-vibration rubber bushing 70 and the anti-vibration rubber mount 48 can absorb vibrations around the rear suspension (vibrations that are not caused by large displacement inputs), so the characteristics of the rubber bushings installed on the leaf springs 20, etc. can be greatly improved. This makes it possible to obtain the most effective characteristics for suppressing input power. From this point as well, it is possible to suppress large displacement inputs.

Furthermore, dampers attached to the leaf springs 20 and spring shackles, which were conventionally used as a measure against vibrations from the road surface, etc., can be removed, which contributes to reducing the weight of the vehicle.

In this embodiment, the body-frame connection structure of a frame-equipped vehicle according to the present invention is applied to the bus 10, but the structure is not limited to this and can be applied to any frame-equipped vehicle such as a truck. It is possible to apply.

Further, in this embodiment, the anti-vibration rubber bushing 70 and the anti-vibration rubber mount 48 are used to absorb vibrations around the rear suspension, but the present invention is not limited to this, and it is possible to suppress vibrations and improve the structure. The first frame 16 and the second frame
Can be applied to the connection with the frame 18 or the second
Support parts 42, 44, 46 between frame 18 and body 12
Any structure that can be applied to can be applied.

[0029]

[Effects of the Invention] As explained above, the connection structure between the body and frame of a vehicle with a frame according to the present invention has the excellent effect of significantly reducing the amount of vibration transmitted from the road surface etc. to the body. has.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a bus to which a frame-equipped vehicle body-frame connection structure according to the present invention is applied, as viewed from the side of the vehicle.

FIG. 2 is a sectional view showing a rigid mount that rigidly connects the first frame and body of FIG. 1;

FIG. 3 is a cross-sectional view showing a vibration-proof rubber mount that supports the second frame and body of FIG. 1 in a vibration-proof manner.

FIG. 4 is a sectional view showing a vibration-proof rubber bushing that connects the first frame and second frame of FIG. 1;

FIG. 5 is a schematic configuration diagram corresponding to FIG. 1 when a conventional bus is viewed from the side of the vehicle.

[Explanation of symbols]

10 Bus (vehicle) 12 Body 14 Frame 16 1st frame 18 2nd frame 32 Rigid mount

Claims (1)

[Claims] Claims: 1. A joint structure between a vehicle body and a frame, in which a body is attached to a frame, the frame having a first frame on the front side of the vehicle and a second frame on the rear side of the vehicle at an intermediate portion in the longitudinal direction of the vehicle. It is divided into 2 frames,
The first frame and the vehicle front side portion of the body are rigidly coupled, the second frame and the vehicle rear side portion of the body are supported by a first vibration isolator, and the first frame and the second frame A frame is a connection structure between a frame-equipped vehicle body and a frame, characterized in that the frame is connected by a second vibration-proofing material.