JPH07117712A - Body mount structure in vechicle with frame - Google Patents

Abstract

PURPOSE:To provide a body mount structure which is in a vechicle with frame and capable of setting a vertical spring constant separately from both longitudinal and horizontal spring constants. CONSTITUTION:The device is a mount structure which sets up an upper mount cushion 14 in the upper part of a frame 12 and a lower mount cushion 15 in the lower part respectively, mounting a car body 18 on an upper side of the upper mount cushion, and supports the car body by way of screwing a nut 22 in a bolt 20 piercing through the car body, the upper mount cushion, the frame and the lower mount cushion in the vertical direction. A rigid holder 24 is attached to an underside of the frame so as to space a distance from the frame 12, coming into contact with the lower mount cushion 16. A center mount cushion 26 to be set up within this distance is compressible in a direction orthogonal with an axis of the bolt 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body mounting structure for a vehicle with a frame. The vehicle with a frame is a passenger car that supports a vehicle body on the frame, or a cab over truck that supports a cab on the frame, and the vehicle body is a vehicle body of the passenger car or a cab of the cab over truck.

[0002]

2. Description of the Related Art An upper mount cushion is arranged above a frame and a lower mount cushion is arranged below the frame. A vehicle body is placed on the upper mount cushion, and the vehicle body, the upper mount cushion, the frame and the lower mount cushion are penetrated. There is a mounting structure in which a nut is screwed into a bolt to apply a compressive force to the upper mount cushion and the lower mount cushion, and the vehicle body is supported in this state (Japanese Utility Model Publication No. 61-97074).

[0003]

In the mount structure described above, when the spring hardness of the upper mount cushion and the lower mount cushion is changed to reduce the spring constant in the vertical direction in order to improve riding comfort and vibration / noise performance. Since the spring constants in the front-rear direction and the left-right direction also become low, the front-rear or left-right movement of the vehicle body becomes large, which may worsen the riding comfort.

An object of the present invention is to provide a mount structure for a vehicle body in a vehicle with a frame, in which the vertical spring constant can be determined independently of the front-back and left-right spring constants.

[0005]

According to the present invention, an upper mount cushion is arranged above a frame and a lower mount cushion is arranged below the frame, and a vehicle body is placed on the upper side of the upper mount cushion. A mount structure for supporting a vehicle body by screwing a nut into a bolt that vertically penetrates the frame and the lower mount cushion, the mount structure being attached to a lower side surface of the frame so as to be spaced from the frame, A rigid holder, which is attached to the upper surface of the frame so as to be in contact with or spaced from the frame, and which contacts the upper mount cushion, and through which the bolt penetrates; Pass through, cross the axis of the bolt And a center mount cushion compressible direction.

[0006]

[Operation and Effect] Since the center mount cushion arranged in the space between the frame and the holder is not displaced in the vertical direction at all, the spring constant in the vertical direction is determined by the upper mount cushion and the lower mount cushion. On the other hand, the spring constants in the front-rear direction and the left-right direction are determined by the upper mount cushion, the lower mount cushion, and the center mount cushion.

The spring constant of the center mount cushion is
It does not affect the vertical spring constant of the mount structure, but does affect the longitudinal and lateral spring constants. Therefore, even if the ride comfort and vibration / noise performance are improved by lowering the spring constant in the vertical direction, the spring constants in the front-rear direction and the left-right direction can be maintained high.

[0008]

EXAMPLE As shown in FIG. 1, a mount structure 10 includes an upper mount cushion 14 above a frame 12,
The lower mount cushions 16 are arranged below the frame 12, respectively, and the vehicle body 18 is placed on the upper side of the upper mount cushion 14, and the vehicle body 18, the upper mount cushion 14, the frame 12, and the lower mount cushion 16 are placed.
A nut 22 is screwed into a bolt 20 that vertically penetrates to support the vehicle body 18, and includes a holder 24 and a center mount cushion 26.

In the illustrated embodiment, the frame 12 is a bracket provided on the frame of the vehicle. In addition to the load in the vertical direction, the load in the front-back direction and the left-right direction is applied to the frame 12 in the front-rear direction and the left-right direction.

The upper mount cushion 14 and the lower mount cushion 16 are made of rubber in a cylindrical shape and, as will be described later, a bolt 20 and a nut 22.
It is kept in a compressed state by and and always works as a compression spring. The spring constants of the upper mount cushion 14 and the lower mount cushion 16 generally differ depending on the hardness of the rubber, but when the hardness is set to a certain value, the spring constant in the up-down direction and the spring constants in the front-rear direction and the left-right direction. Are correlated. Therefore, it is not possible to use a soft spring only in the vertical direction, which causes the above problem.

The vehicle body 18 is a cab of a cab over truck in the illustrated embodiment. For example, 4 cabs
The frame 12 is formed by the mounting structure 10 arranged at a certain position.
Supported by.

In the illustrated embodiment, the holder 24 has a cylindrical regulating portion 28, a contact portion 29 extending inward in the radial direction at one end of the regulating portion 28, and a radius at the other end of the regulating portion 28. And a flange portion 30 extending outward in the direction. The holder 24 is attached to the lower side surface of the frame 12 by the flange portion 30 being applied to the lower side surface of the frame 12 and a bolt 34 penetrating the frame 12 and the flange portion 30 and a nut 36 screwed into the bolt 34. As a result, the frame 12 and the contact portion 29 are separated by a distance D. The contact portion 29 has a through hole 31 having a diameter larger than the outer diameter of the collar 38 arranged outside the bolt 20. The lower mount cushion 16 is arranged below the contact portion 29 so as to contact the contact portion 29.

The holder 24 is made of metal and is rigid. Here, the rigid body means that the holder 24 has a large rigidity to the extent that the holder 24 is not deformed by the load applied from the vehicle body 18 in the up-down direction or the front-rear, left-right direction.

The center mount cushion 26 is made of rubber in a cylindrical shape, and has a frame 12 and a holder 2.
4 and is surrounded by a collar 38. The center mount cushion 26 is compressible in the direction orthogonal to the axis of the bolt 20. In the illustrated embodiment, the through hole 31 of the contact portion 29 of the holder 24 has the collar 38.
Since the outer diameter of the collar 38 is larger than the outer diameter thereof, the collar 38 moves in the direction orthogonal to the axis by the amount corresponding to the difference and compresses the center mount cushion 26. In order for the center mount cushion 26 to immediately exhibit the spring function by the movement of the collar 38 in the direction orthogonal to the axis of the collar 38, the center mount cushion 26 includes the restriction portion 28 of the holder 24.
And the collar 38 so as to be substantially in contact with the collar 38 so as to have no radial clearance.

The center mount cushion 26 is attached to the holder 2
4 and the holder 24 into the plurality of bolts 3
4 and a nut 36 screwed into each bolt 34 and attached to the frame 12. The positioning holder 40 is applied to the upper side surface of the frame 12, the collar 38 into which the upper mount cushion 14 is press-fitted is inserted into the frame 12 from above the frame 12 to penetrate the center mount cushion 26 and the holder 24, and further downward from the holder 24. The lower mount cushion 16 is press-fitted into the portion of the collar 38 projecting inward. The retainer 42 is applied to the upper mount cushion 14 and the retainer 44 is applied to the lower mount cushion 16, the bolt 20 penetrating the vehicle body 18 is passed through the retainer 42, the collar 38 and the retainer 44, and the nut 22 is screwed into the end of the bolt 20. Tighten with.
As a result, the two retainers 42 and 44 abut the end surface of the collar 38, and the upper mount cushion 14 and the lower mount cushion 16 are compressed in the axial direction of the collar 38, but the center mount cushion 26 does not contact the holder 24 and the frame 12. It is not compressed because it is between.

The upper mount cushion 14 and the lower mount cushion 16 act as springs with respect to the vertical load applied from the vehicle body 18, and the upper mount cushion 14 and the lower mount cushion 16 with respect to the longitudinal load and the lateral load.
The lower mount cushion 16 and the center mount cushion 26 act as springs. Now, let Kz be the spring constant of the upper mount cushion 14 and the lower mount cushion 16 in the vertical direction, Kxy be the spring constants of the front-rear direction and the left-right direction, and Cxy be the spring constants of the center-mount cushion 26 in the front-back direction and the left-right direction. , The spring constant of the entire mount structure 10 in the vertical direction is Kz mount structure 10
The overall spring constant in the front-back and left-right directions is (Kxy + Cx
y).

In the embodiment shown in FIG. 2, the center mount cushion 50 in the holder 24 is provided with two hollow portions 52. The cut-out portion 52 is located in the front-rear direction of the bolt 20, and the horizontal cross-section of the cut-out portion has an arc shape with the axis of the bolt 20 as the center. In this way, the center mount cushion 50 has a hollow portion 52.
By providing, the spring constant of the center mount cushion 50 in the direction connecting the two cutouts 52 and the axis of the bolt 20 can be reduced.

As is apparent from FIG. 1, the holder 24
The distance D, and therefore the thickness of the center mount cushion 26, is smaller than the thickness of the lower mount cushion 16. This means that when the mounting structure 10 according to the present invention is adopted, the mounting position of the lower mount cushion 16 is slightly lowered. In other words, if a relatively large space is reserved for the lower mount cushion 16, the holder 24 can be attached to the existing mounting structure to hold the center mount cushion 26 and use the long bolt 20 to provide the present invention. It can be easily modified to the mount structure.

Instead of the above embodiment, the holder is replaced by the frame 1.
It may be attached to the upper side surface of the frame 12 so as to be spaced apart from the frame 2, and may be brought into contact with the upper mount cushion 14. In this case, the positioning holder 40 is replaced by the holder 2
4, or only the flange portion around the positioning holder 40 is attached to the outer periphery of the contact portion 29 of the holder 24.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of a vehicle body mount structure in a vehicle with a frame according to the present invention.

FIG. 2 is a cross-sectional view of another embodiment of a vehicle body mounting structure in a vehicle with a frame according to the present invention.

[Explanation of symbols]

 10 mount structure 12 frame 14 upper mount cushion 16 lower mount cushion 18 vehicle body 20 bolt 22 nut 24 holder 26, 50 center mount cushion 52 hollowed part

Claims (1)

[Claims] 1. An upper mount cushion is arranged above the frame, and a lower mount cushion is arranged below the frame. A vehicle body is placed on the upper mount cushion, and the vehicle body, the upper mount cushion, the frame and the lower mount cushion are vertically moved. A mounting structure for supporting a vehicle body by screwing a nut into a bolt penetrating in a direction, the mounting structure being attached to a lower side surface of the frame so as to be spaced from the frame and contacting the lower mount cushion or from the frame. A rigid holder that is attached to the upper side surface of the frame so as to be spaced and that contacts the upper mount cushion and that allows the bolt to penetrate, and a holder that is disposed within the interval and that allows the bolt to penetrate, that is, the axis of the bolt. Centama that can be compressed in orthogonal directions A mount structure for a vehicle body in a vehicle with a frame, which includes an und cushion.