JPH042863Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cabin support structure for elastically supporting the cabin of an automobile on the vehicle body.

[Prior art]

Conventionally, as support structures for elastically supporting the cabin of cab-over type vehicles such as trucks on the vehicle body frame, there have been two types of support structures: a rubber-type support structure in which the front and rear parts of the cabin are each supported by rubber elastic members; There are semi-floating support structures in which the rear part is supported by coil springs and oil dampers, respectively, and full-floating support structures in which the front and rear parts of the cabin are supported by coil springs and oil dampers, respectively (for example, in actual use). (see Japanese Patent Publication No. 169277/1983) are generally adopted.

Elastic support structures consisting of coil springs and oil dampers, such as the semi-floating support structure and full-floating support structure mentioned above, have recently been widely adopted. Since a coil spring is interposed, the mechanism becomes complicated and large.

Therefore, in a previous application, the applicant of the present application proposed a link type elastic support mechanism consisting of a damper and a swing arm pivotally connected via a rubber bush type elastic pivot mechanism.

This link-type support mechanism utilizes the elastic force of a rubber bushing that is torsionally deformed when the swinging arm swings in response to relative displacement between the cabin and the vehicle body frame.

By the way, in semi-floating support structures, full-floating support structures, and link-type support mechanisms, the maximum relative displacement is restricted when the vehicle body bumps significantly upward relative to the cabin on a convex part of the road surface or a raised part. It is desirable to provide a bump stop lever for controlling the vehicle body, and a rebound stop lever for regulating the maximum relative displacement when the vehicle body rebounds significantly downward relative to the cabin.

[The problem that the idea aims to solve]

In the above link-type support mechanism, if the bump stop lever and rebound stop lever are omitted and a structure is adopted in which the large displacement in the bump direction and rebound direction is absorbed by the rubber bushing, the rubber bushing becomes large, and as a result, the link type Not only does the support mechanism become larger, but the rubber bushing also tends to deteriorate, reducing its durability.

Therefore, a bump stop lever and a rebound stop lever are provided, including a bump stop lever that restricts the maximum downward swinging displacement of the swinging arm, and a rebound that controls the maximum upward swinging displacement of the swinging arm. It is conceivable to provide a stopper bar.

However, in this case, the swing arm becomes larger and the inertia of the swing arm increases due to the larger size, which reduces the responsiveness of the swing motion of the swing arm and reduces ride comfort. When there is a bump or rebound, the vibration of the swing arm is propagated to the cabin, resulting in a reduction in riding comfort.

An object of the present invention is to provide a link-type cabin support structure that is small and lightweight and that can improve riding comfort.

[Means to solve the problem]

A cabin support structure according to the present invention is a cabin support structure that elastically supports an automobile cabin on a vehicle body frame, and includes a box bracket fixed to the vehicle body frame, and a substantially horizontal support plate of the box bracket approximately below the support plate. A swinging arm that is arranged horizontally, one end of which is pivotally connected to a box bracket via a rubber bushing, and is swingable about this one end, and the other end of the swinging arm is connected to the vehicle body frame. a supporting damper, a connecting member that loosely fits through the supporting plate and is pivotally connected to the other end of the swing arm at its lower end, and a support that is disposed above the supporting plate and fixed to the connecting member. a cabin support member that supports the cabin; a stop lever fixed to the upper surface of the support plate so as to come into contact with the lower surface of the support member during large displacement toward the bump side; and a rocking lever during large displacement toward the rebound side. A stop lever is fixed to the lower surface of the support plate so as to come into contact with the upper surface of the other end.

[Effect]

In the cabin support structure according to the present invention,
When the vehicle bumps or rebounds, the swing arm swings up and down, and energy is absorbed by the elastic torsional deformation of the rubber bushing, and energy is absorbed by the expansion and contraction of the damper, suppressing cabin vibration.

When the vehicle body makes a large displacement toward the bump side relative to the cabin, the stopper bar on the top surface of the support plate of the box bracket comes into contact with the lower surface of the support member, and the support member is received by this stopper bar, causing maximum displacement toward the bump side. Displacement is regulated. Also,
When the vehicle body makes a large displacement toward the rebound side, the stop lever on the lower surface of the support plate of the box bracket comes into contact with the upper surface of the other end of the swinging arm, and the other end of the swinging arm is received by this stopper lever.
The maximum displacement toward the rebound side is regulated.

Since the above-mentioned pair of upper and lower stopper bars are provided and configured to restrict the maximum displacement in the bump direction and the maximum displacement in the rebound direction, the rubber bushing that pivotally supports one end of the swinging arm can be made smaller and lighter. The cabin support structure can be made smaller and lighter.

Since a pair of stop levers is configured to receive the lower surface of the support member and the upper surface of the other end of the swing arm, the swing arm can be made smaller and lighter, and its operational responsiveness can be improved to improve riding comfort. At the same time, vibration propagation from the swing arm to the cabin can be suppressed to improve riding comfort.

[Effect of idea]

According to the cabin support structure according to the present invention, as explained in the above [Function] section, the rubber bush can be made smaller and lighter, and the cabin support structure can be made smaller and lighter. It is possible to reduce the size and weight of the engine, increase its operational response, improve ride comfort, and suppress vibration propagation from the swing arm to the cabin, improving ride comfort.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

As shown in Figures 1 and 2, the tilt-type cabin of the cab-over type truck T is equipped with a cabin 3 that forms a driver's cab at the front of a pair of left and right frames 1 and 2 that extend in the longitudinal direction of the vehicle body. The front end of the cabin 3 and the front ends of the frames 1 and 2 are connected by a hinge mechanism 4, so that the cabin 3 can be tilted from a locked position shown by a solid line to a tilted position shown by a two-dot chain line. There is.

The hinge mechanism 4 is configured as follows. As shown in FIG. 3, there are cabin mount brackets 5 and 6 on the left and right sides of the lower front end of the cabin 3.
are fixed by welding or the like, and frame brackets 7 and 8 are respectively fixed to the upper front ends of the frames 1 and 2 on the outside of the brackets 5 and 6, while the cabin mount brackets 5 and 6 are aligned on the tilting axis. Both ends of the mount tube 9, which is inserted and fixed by welding, are supported by the left and right frame brackets 7, 8 via rubber bushings 10, 11, and the cabin 3 is hinged to the left and right frames 1, 2 so as to be tiltable. At the same time, cushioning of the cabin 3 in the vertical and longitudinal directions is guaranteed.

In addition to fastening and fixing the right frame brackets 7 and 8 to the left and right frames 1 and 2 with mounting bolts 12 and 12, the auxiliary brackets 13 and 13 fixed to the left and right frames 1 and 2 are also fastened and fixed with mounting bolts 1.
It has a strong fixed structure that is fastened and fixed with 4 and 14.

The left and right frame brackets 8 support a connecting tube 15 that is continuous with the mount tube 9, and a flange member 16 welded and fixed to the connecting tube 15 is fastened and fixed to the side wall of the right frame bracket 8 with a mounting bolt 17.

The above mounting tube 9 and connection tube 1
A long torsion bar 18 is inserted into the inside of the torsion bar 18, and the left end corner 18a of the torsion bar 18 is non-rotatably fitted into the left end square hole 9a of the mount tube 9, and the right end corner 18b of the torsion bar 18 is It is non-rotatably fitted into a square hole 19a of a cap 19 welded to the right end of the connecting tube 15, and includes left and right mount brackets 5, 6, a mount tube 9, and a left end corner 18a of the torsion bar 18, which are integrated on the side of the cabin 3. , left and right frame brackets 7 integrated on the left and right frames 1 and 2 sides,
8. From the relationship between the connecting tube 15, the cap 19, and the right end corner 18b of the torsion bar 18, when the cabin 3 is in the locked position, the torsion bar 18 is twisted to accumulate elastic strain energy, and when it is tilted to the tilted position, the torsion bar 18 is The cabin 3 can be tilted slightly by using the elastic restoring force based on the above-mentioned elastic strain energy,
The hinge mechanism 4 also serves as an assist mechanism.

Next, we will explain the locking mechanism that locks the left and right parts of the rear end of the cabin 3 to the left and right frames 1 and 2, respectively, and the elastic support mechanism 20 that elastically supports them. explain.

As shown in FIGS. 4 to 6, a box bracket 21 is fixed to the outside of the frame 1 by welding, and its support plate 21a is positioned horizontally higher than the upper surface of the frame 1.

A trapezoidal leg member 22 is fixed to the lower end of the cabin 3 above the support plate 21a,
A support member 24 that receives the leg member 22 via a pair of cushioning materials 23 made of rubber is disposed above the support plate 21a.

Further, leg members 23 are provided on the upper surface of the support member 24.
A connecting plate 25 is inserted through an opening 22a in the bottom wall of the cabin 3, and is erected close to the lower surface of the cabin 3, and has a locking hole 25a formed at its upper end.

A hook 27 is rotatably attached to a bracket 26 on the lower surface of the cabin 3 near the upper end of the connecting plate 25, and the upper ends of the left and right hooks 27 are interlocked and connected by a link rod 28.

A connecting member 29 having a gate shape in side view is fixed to the lower surface of the supporting member 24, and the front and rear side plates 29a of this connecting member 29 are loosely inserted into insertion holes 30 that are opened horizontally at the front and rear of the supporting plate 21a. and extends downward;
The upper end of an oil damper 31 is connected to the lower end of the pair of front and rear side plates 29a via a pivot mechanism 32, and the damper 31 is disposed diagonally downward from the pivot towards the frame 1. The lower end of the box bracket 21 is pivotally connected to the lower part of the box bracket 21 via a sleeve 33 and a bolt 34.

On the other hand, the swing arm 35 having a gate-shaped cross section is disposed horizontally from the pivot mechanism 32 toward the center of the vehicle body.
The outer end of the swing arm 35 is pivotally connected to the pivot mechanism 32, and the inner end of the swing arm 35 is pivotally supported to the box bracket 21 via a rubber bush type elastic pivot mechanism 36. has been done.

The pivot mechanism 32 that pivots the upper end of the damper 31 and the outer end of the swing arm 35 is constructed as follows.

That is, as shown in FIG. 6, a rubber bushing 37 is fitted and bonded to the outer cylinder 31a at the upper end of the damper 31, and an inner cylinder 38 is fitted and bonded to the rubber bushing 37 between the side plates 35a of the swing arm 35. Sleeves 40 are fitted onto both ends of the bolt 39 inserted into the inner cylinder 38, a rubber bushing 41 is fitted and bonded onto each sleeve 40, a boss 42 is fitted and bonded onto the outside of each rubber bushing 41, and the front and rear bosses 4
2 are pivotally attached to respective pivot holes in the front and rear side plates 29a of the connecting member 29, and the bolt 39, sleeve 40, and inner cylinder 38 are integrally fixed by fastening the bolt 39 and nut 39a.

The elastic pivot mechanism 36 that pivots the inner end of the swing arm 35 is constructed as follows.

As shown in FIG. 6, a rubber bushing 43 is fitted and bonded to the outer cylinder 31b at the inner end of the swinging arm 35, and an inner cylinder 44 that is longer than the rubber bushing 43 is fitted and bonded to the rubber bushing 43. The front end of the bolt 45 inserted through the box bracket 21 is pivoted to a pivot hole in the front wall 21b of the box bracket 21, and the rear end of the bolt 45 is pivoted to a pivot hole in the pivot portion 46a of the adjustment lever 46. The inner cylinder 44 is connected to the front wall 21
By tightening the nut 45a at the rear end of the bolt 45, the bolt 4
5, the inner cylinder 44, the pivot portion 46a, and the front wall 21b are integrally fixed.

A ring member 47 is welded to the front surface of the pivot portion 46a of the adjustment lever 46, and this ring member 47 is fitted onto the rear end of the inner cylinder 44 by serration connection so as to be relatively unrotatable. . however,
Instead of serration connection, spline fitting or welding may be used.

The adjustment lever 46 is used to adjust the rotation angle of the inner cylinder 44 when the rubber bush 43 of the elastic pivot mechanism 36 deteriorates after long-term use and its elasticity decreases. extends downward along the outside of the rear wall 21c,
An arc-shaped adjustment hole 48 elongated in the vehicle width direction is formed at the lower end of the adjustment lever 46, and by tightening a bolt 49 inserted through the adjustment hole 48 and a nut 49a, the rear wall 21 of the box bracket 21 can be adjusted.
The lower end of the adjustment lever 46 is fixed to c, the rotation angle of the adjustment lever 46 can be adjusted through an adjustment hole 48, and the adjustment lever 46 can be fixed to the box bracket 21 with a bolt 49.

Note that the adjustment hole 48 is connected to the box bracket 21.
It may also be formed on the rear wall 21c and fixed with bolts and nuts inserted through the adjustment lever 46.

Next, a bump stopper 50 that restricts a large displacement of the vehicle body by a predetermined amount or more when bumping is fixed to the upper surface of the support plate 21a between the side plates 29a of the connecting member 29 via a stopper holder 51. It is adapted to be received by the top wall of the connecting plate 29 and the supporting member 24.

In addition, a rebound stopper 52 is provided on the support plate 21 to restrict a large displacement of more than a predetermined amount when the vehicle body rebounds.
The rebound stopper 52 is fixed to the lower surface of the bump stopper 50 via a stopper holder 53 symmetrically with the bump stopper 50, so that the rebound stopper 52 is received by the center wall 35b of the swing arm 35 when the rebound stopper 52 is greatly displaced during rebound.

The bump stopper 50 and the rebound stopper 52 are cylindrical bodies made of rubber, and about 1/3 of the distal end thereof is formed in the middle with a triangular cross section, and about 2/3 of the proximal end thereof is formed into a solid body with a triangular cross section.
The third part is formed into a hollow shape.

However, these stoppers 50, 52 may be formed entirely in a solid shape, or may be formed such that approximately 1/3 of the distal end is made of rubber and 2/3 of the proximal end is made of metal.

In the above configuration, the operation is as follows.

As already explained, when the cabin 3 is locked in the lock position, the torsion bar 1
When the hook 31 is removed and the cabin 3 is tilted, the elastic restoring force of the torsion bar 18 assists and reduces the tilting operation force.

By tilting the cabin 3 to the lock position, compressing the cushioning material 23, and engaging the hook 27 with the locking hole 25a, the cabin 3 locks into the frames 1 and 2.
Locked to the side.

When the truck runs, the main body bumps and the support member 2
4 and the support plate 21a becomes smaller, the connecting member 29 moves downward relative to the box bracket 21, and the swing arm 35 swings downward. At this time, the rubber bush of the elastic pivot mechanism 36 43 is twisted and elastically deformed, and the elastic restoring force acts on the pivot mechanism 32 via the swing arm 35 to exert an upward resistance force on the displacement decreasing side, thereby suppressing the pivot mechanism 32 from being largely displaced.

Furthermore, the torsional elastic deformation of the rubber bushings 37 and 41 also suppresses displacement at the time of bumps.

Note that the swing arm 35 is made of rubber bushes 37, 4.
It is possible to swing vertically through compressive deformation of 1,43, and this compressive deformation also acts to suppress displacement.

When the vehicle rebounds, the connecting plate 29 moves upward relative to the box bracket 21, and the swinging arm 35 swings upward, but in this case as well, the rubber bushes 37,
41 and 43 to prevent large displacement.

Here, when the vehicle body significantly bumps upward relative to the cabin 3, the bump stopper 50 catches the lower surface of the support member 24 to restrict the maximum displacement at the time of bump, and also relative to the cabin 3. When the vehicle body rebounds significantly downward, the rebound stopper 52 catches the upper surface of the swing arm 35 to restrict the maximum displacement at the time of rebound.

By the way, during long-term use, the rubber bushes 37, 41, and 43 deteriorate and become less elastic, resulting in a decrease in spring constant and a decrease in the suppressing function.

The bump suppression function is especially important, so when the function deteriorates as described above, loosen the bolt 49 and adjust the lever 4.
After adjusting the rotation angle by rotating the inner cylinder 44 in the direction opposite to the twisting direction at the time of bumping (clockwise in FIG. 4) through the bolt 49 and the nut 49
The adjustment lever 46 is fixed by a.

In this way, the function of the rubber bushing 43 can be restored.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a side view of the main parts of a cab-over type truck, Fig. 2 is a plan view of the same, and Fig. 3 is a hinge mechanism (assist mechanism).
4 is a longitudinal sectional front view of the locking mechanism and the elastic support mechanism, FIG. 5 is a sectional view taken along the line of FIG. 4, and FIG. 6 is a sectional view taken along the line of FIG. 4. 1, 2...frame, 3...cabin, 21...
...Box bracket, 21a...Support plate, 24
... Support member, 29 ... Connection member, 31 ... Oil damper, 35 ... Swing arm, 43 ... Rubber bush, 50 ... Bump stopper, 52 ... Rebound stopper.

Claims (1)

[Scope of Claim for Utility Model Registration] A cabin support structure for elastically supporting the cabin of an automobile on a body frame, comprising: a box bracket fixed to the body frame; a swinging arm which is arranged and whose one end is pivotally connected to the box bracket via a rubber bushing and is swingable about the one end; and the other end of the swinging arm is supported with respect to the vehicle body frame. a damper; a connecting member which is loosely inserted through the support plate and whose lower end is pivotally connected to the other end of the swing arm; and a support member which is disposed above the support plate and is fixed to the connecting member; A cabin support member that supports the cabin, a stop lever fixed to the upper surface of the support plate so as to come into contact with the lower surface of the support member when there is a large displacement toward the bump side, and a swing lever when there is a large displacement toward the rebound side. A support structure for a cabin, comprising a stopper bar fixed to the lower surface of the support plate so as to abut the upper surface of the end portion.