JPS6020538Y2 - Automobile tail cab rear suspension system - Google Patents

Description

[Detailed description of the invention] This invention relates to a device for suspending the rear part of a tilt cab for an automobile, in which the cab mounted on the front part of the frame can be tilted and rotated forward about its front end. It is.

In order to improve the riding comfort of a car equipped with a tilt cab as described above, the rear part of the cab is suspended against the frame using springs and shock absorbers to reduce shocks, vibrations, etc. that are transmitted from the frame to the cab. It is preferable to absorb and attenuate it.

However, in order to tilt the cab forward, it is necessary to provide a locking mechanism that releasably connects the rear of the cab and the frame. The floating bar was connected with a pair of left and right springs and shock absorbers, and the rear part of the cab was supported in detachable contact with the upper surface of the floating bar.

In conventional suspension systems with this configuration, it is necessary to install a floating bar between the frame and the cab, which increases the vertical height of the suspension system and increases the ground clearance of the cab, making it difficult for passengers to get in and out of the vehicle. At the same time, in order to prevent the cab from swinging sideways, it is necessary to provide a lateral rod to connect the frame and the floating bar, which complicates the structure of the suspension system and increases its weight. The drawback was that the suspension system was expensive.

This invention eliminates these conventional drawbacks and provides a rear suspension for tilt cabs for automobiles that is simple and compact in construction and can sufficiently attenuate and absorb shocks and vibrations that are transmitted from the frame to the cab. The aim is to provide equipment.

Hereinafter, this invention will be explained in detail based on an embodiment shown in the accompanying drawings.

Reference numeral 1 denotes a frame constructed in the form of a plane ladder, 2 a cab mounted on the front part of the frame 1, and 3 a loading platform mounted on the rear part of the frame 1. As shown by the dashed line in FIG. 1, it is constructed so that it can be tilted and rotated forward.

Reference numeral 4 denotes a bracket which is fastened to the outer surface of the side member of the frame 1 with bolts 5, and an engine rear mounting (not shown) is also fastened and fixed with the bolt 5 to the inner surface of the side member.

The upper surface of the bracket 4 fixed to the frame 1 in this manner is formed substantially horizontally, and the support 6 is fastened and fixed with bolts 7 to the inner side of the upper surface.

The inner end of a swing arm 10 is pivotally attached to a support shaft 8 provided at the upper end of the support 6 and extends in the front-rear direction via a rubber bush 9 so as to be able to swing vertically. The outer end of an arm 11 disposed above the arm 10 is pivotally connected via a connecting shaft 12 parallel to the support shaft 8 so as to be vertically swingable.

A ring-shaped buffer rubber 13 is attached to the outer side of the upper surface of the bracket 4, and the upper surface of the buffer rubber 13 and the support arm 1
A coil spring 14 is stretched between the lower surface of the bracket 4 and the lower surface of the support arm 11 to swing and urge the support arm 11 and the swing arm 10 upward, respectively. The swing arm 10 and the support arm 11 are connected to each other through a shock absorber 17 to damp the vertical movement of the swing arm 10 and the support arm 11 relative to the bracket 4.

In the embodiment, a coil spring 14 stretched between the bracket 4 and the support arm 11 biases the swing arm 10 and the support arm 11 upward, and a shock absorber 17 is installed inside the spring 14. By this, the support mechanism is simplified and made compact, but the swing arm 10 and the support arm 11 are
Alternatively, the spring 14 and the shock absorber 17 may be arranged side by side, or the spring may be composed of a rubber spring or the like to retain the vibration damping function. Good too.

Also, depending on the structure of the frame 1, the swing arm 1
The inner end of the swing arm 10 may be pivoted directly to the outer surface of the side member of the frame 1, or the swing arm 10 may be pivoted to a rear arch connecting the left and right side members.

Reference numeral 18 denotes a positioning member which is tightened and fixed to the upper surface of the support arm 11 with a bolt 19, and is bent into an inverted V-shape from the front, and an anchor bolt 20 having an inverted U-shape from the side is attached to the top of the positioning member.
are tightened and fixed with nuts 21, and cushioning rubbers 22 are attached to the inclined surfaces on both sides that sandwich the anchor bolts 20, respectively.

Further, a positioning member 23 whose bottom face is recessed in an inverted V-shape from the front is fixed at a position facing the positioning member 18 at the rear end of the cab 2, and an anchor through hole 24 is provided in the center of the bottom face of the positioning member 23. has been established.

Reference numeral 25 denotes a bracket provided on the positioning member 23. The lower end of a lever 26 is pivotally attached to the bracket 25 so as to be able to swing left and right, and the lower end is engaged with the anchor bolt 20 at the middle part of the lever 26. The upper end of the hook 27 is pivoted so as to be swingable from side to side.

The hook 27 is held swinging in the engagement direction by a spring (not shown), and the lever 26 is configured to be interlocked with the left and right sides by a connecting rod 28.

A control link 29 connects the lever 26 and the control arm 30 whose swing is controlled by a handle (not shown).

In the embodiment, only the suspension device on the left side has the configuration shown in the figure, and the suspension device on the right side has the inner end of the support arm attached to a frame (bracket), which is not shown, so that it can swing vertically, and the swing arm is omitted. Of course, the left and right suspension devices may have the same configuration.

In a rear suspension system for a tilt cab for an automobile having such a configuration, normally, as shown in FIG. Abut the anchor through hole 24
The anchor bolt 20 is inserted into the positioning member 23 and the lower end of the hook 27 is engaged with the anchor bolt 20 to fix the rear part of the cab 2 on the support arm 11 and prevent the cab 2 from tilting forward.

The support arm 11 fixed to the rear of the cab 2 in this manner is pivoted to the swinging end of the swing arm 10, which is pivotally connected to the frame 1 via the bracket 4 and the support 6 so as to be able to swing up and down. A coil spring 14 is stretched between the bracket 4 and the support arm 11 which are pivotally connected and fixed to the frame 1, and is urged to swing upward. frame 1 from the road surface etc.
The shocks and vibrations transmitted to the rear of the cab 2 are not transmitted to the rear of the cab 2.

That is, the frame 1 and the support arm 11 fixed to the rear part of the cab 2 are connected via the swing arm 10 so as to be able to move up and down, and the coil spring 14 and the shock absorber 17 are connected between the frame 1 and the support arm 11. Therefore, shocks and vibrations that are transmitted from the frame 1 to the support arm 11 are attenuated and absorbed by the expansion and contraction action of the spring 14 and the shock absorber 17.

At this time, the swing arm 10 has its inner end attached to the support 6 fixed to the bracket 4, and its outer end attached to the support arm 1.
1, the bracket 4 and the support arm 11 move up and down relative to each other as the spring 14 and the shock absorber 17 expand and contract, and the swing arm 10 moves up and down. Even if the support arm 11 is swung, the support arm 11 can always be maintained in a constant position, and there is no fear of applying excessive force to the abutting and engaging portion between the support arm 11 and the rear part of the cab 2.

Note that when the swing arm 10 swings up and down when the support arm 11 is raised and lowered, the support arm 11 tends to deviate from side to side due to this oscillation, but the amount of this deviation is extremely small. Therefore, the deviation can be absorbed by deforming the rubber bush 9 interposed between the inner end of the swing arm 10 and the support 6.

Further, as described above, the swing arm 10 connecting the support arm 11 and the support 6 also maintains the function as a lateral rod for the support arm 11, so that the cab 2 does not sway laterally.

Furthermore, if buffer rubbers 13.22 are installed between the coil spring 14 and the bracket 4 and at the mating contact portions of both the positioning members 18.23, the frame 1
These cushioning rubbers 1322 can attenuate to some extent the shocks and vibrations that are about to be transmitted to the cab 2, and at the same time,
This is extremely effective in preventing surging in the coil spring 14 and preventing looseness in the fitting portions of both positioning members 18 and 23.

When tilting and rotating the cab 2 forward, the control arm 30 is swung in the direction of the arrow by a handle (not shown), the lever 26 is swung in the same direction, and the hook 27 is moved inward while being moved downward. By removing the lower end from the anchor bolt 20, the engagement and fixation between the support arm 11 and the cab can be released.

When the support arm 11 and the rear part of the cab 2 are disengaged and a forward tilting force is applied to the cab 2, the cab 2 opens a cab hinge (not shown) that pivots the lower front end of the cab 2 to the front end of the frame 1. The center is tilted forward as shown by the dashed line in Figure 1.

Then, if the cab 2, which is tilted forward, is swung back to its original position,
The lower end of the hook 27 engages with the anchor bolt 20 when the positioning member 23 on the cab 2 side and the positioning member 18 on the support arm 11 side are fitted against each other.

Therefore, the control arm 3 is controlled by a handle (not shown).
0 in the opposite direction of the arrow, and the lever 26 in the same direction, the hook 27 moves outward and rises, and both positioning members 18.
23 are fitted against each other, and the rear of the cab 2 is attached to the support arm 11.
This prevents it from tilting forward by fixing it upward.

As explained above, according to this invention, the rear part of the cab is detachably supported in contact with the support arm which is substantially floatingly supported via the swing arm, spring and shock absorber. There is no need to install a long floating bar between the frame and the cab, and the swing arm guides the support arm up and down and at the same time prevents it from swinging, making the suspension system simpler and more compact. Such,
The comfort of the cab and the ease of getting in and out of the cab can be improved.

[Brief explanation of the drawing]

Fig. 1 is a side view of a part of an automobile equipped with an embodiment of this invention, Fig. 2 is a rear view with part of the main parts cut away, and Fig. 3 is a partially cutaway view of the same.
The figure is a side view of a part of Figure 2, and Figure 4 is IV-I of Figure 2.
It is a V sectional view. 1...Frame, 2...Cab, 4.
...Bracket, 10 ... Swing arm, 11 ... Support arm, 13 ... Buffer rubber, 14 ... (Coil) spring, 17
... Shock absorber, 18 ... Positioning member, 20 ... Anchor (bolt) 22.
...Buffer rubber, 23...Positioning member,
27... Hook.

Claims (4)

[Scope of utility model registration request] (1) In a tilt cab for automobiles in which the cab mounted on the front part of the frame can be tilted and rotated forward, the inner end of the almost horizontal swing arm is pivoted to the frame so that it can swing vertically. A substantially horizontal support arm is disposed above the swing arm, and the outer ends of both arms are pivotally connected to each other so as to be able to swing vertically, and a spring and a support arm that urges the support arm to swing upward are provided. A tilt cab for an automobile, characterized in that a shock absorber for damping vertical movement of the arm is provided between the frame and the support arm, and the rear part of the cab is supported in contact with the upper surface of the support arm in a detachable manner. rear suspension. (2) The spring that urges the support arm to swing upward is composed of a coil spring stretched between the top surface of the bracket fixed to the frame and the bottom surface of the support arm, and also damps the vertical movement of the support arm. The rear suspension system for a tilt cab for an automobile according to claim 1, wherein a shock absorber for connecting the support arm and the bracket is disposed inside the coil spring. (3) Claims for registration of a utility model in which a positioning member and an anchor are provided on the upper surface of the support arm, and a positioning member that fits into the positioning member and a hook that engages and disengages from the anchor are provided at the rear of the cab. The rear suspension system for a tilt cab for an automobile according to item 1. (4) The rear suspension system for a tilt cab for an automobile as set forth in claim 1, which is a registered utility model, and includes cushioning rubber attached to the contact portion between the support arm and the cab and the contact portion between the spring and the frame, respectively.