JPS58112881A - Tilt cab type car - Google Patents

Abstract

PURPOSE:To reduce the manufacturing cost without enlarging the size by hooking a projection of an operating rod to a projected clamp upon lifting the cab to the tilting position. CONSTITUTION:When a cab 12 is at the riding position, a projection 16 of an operating rod 32 is released from a projected clamp 17 to support the cab 12 resiliently on the chassis 11 thereby the vibration at the chassis 11 side is never transmitted directly to the cab 12 side during the travelling. When the cab 12 is lifted to the tilting position, the projection 16 is hooked to a bent seat face 37 thereby the cab 12 is blocked from tilting forward such that the center of gravity of the cab 12 will never exceed over the tilt shaft 23, and the stopper bar 38 is geared with a flange 42 of a hydraulic cylinder 14 by means of a coil spring 40 thus to hold the cab 12 at the inclined position reliably.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in tilt-and-drive vehicles.

Conventionally, this type of tilt-cab automobile has a cab,
A hydraulic operating cylinder is used to rotate the cab about the tilt pin relative to the chassis, to raise the cab from the riding position to the leaning position, and to lower the cab from the leaning position to the riding position. We are prepared.

However, since the cab is resiliently supported on its chassis, the operating cylinder is provided with means for allowing free movement of the cab on the chassis and for tilting the cab from the riding position. In the over-tilt position (over-tilt range), where the center of gravity of the cab is tilted forward beyond the tilt shaft,
Means have been provided to inhibit movement of the cab relative to the chassis.

For example, British Patent No. 1,399,612 describes the mechanical construction of these means, and U.S. Pat. No. 1,447,673 describes the hydraulic circuit construction. It has been disclosed and used.

However, in the former case, the piston rod is fitted in the bearing hole of the trunnion rotatably held in the cab bracket so that it can slide back and forth, and the hydraulic gloss is connected to the cab, so the cab can freely move relative to the chassis. Moreover, the trunnion must be made thicker or made of expensive material in order to provide sufficient mechanical strength; However, when the cab is in the riding position with respect to the chassis, that is, when the cab is in the driving position, the cab is means for facilitating free movement; and the cab is raised from a riding position to a reclined position about a tilt shaft with respect to the chassis, and the center of gravity of the cab is moved over the tilt shaft; The cab tilt means has means for reliably suppressing the tilting movement of the cab relative to the chassis when tilting forward, and the bending load is less likely to be applied to the cab tilt means, and the life of the cab tilt means is improved. The long comb, the means for smoothing the free movement of the cab and the means for suppressing the tilting movement of the cab improve mechanical strength and simplify the structure without increasing the size.
The purpose of the present invention is to provide a tilt cab type automobile that has a small number of parts and reduces manufacturing costs.

To solve these problems, the tilt cab type vehicle of the present invention is provided with a hydraulic operating cylinder as a cab tilt means, and further extends rearward of the tilt shaft and is disposed in the longitudinal direction of the chassis. , a longitudinal tilt link rotatably connected at one end to the cab and at the other end to the other of the cylinder and the operating rod;
a projection disposed on the other of the cylinder and the operating rod in a direction including an axis substantially parallel to the axis of rotation of the other of the cylinder and the operating rod rotatably connected to the longitudinal tilt link; and a protrusion flange disposed on the cab so as to hook the protrusion when the vehicle is lifted from the riding position to the tilted position around the tilt shaft relative to the chassis.

Hereinafter, preferred specific examples of the tilt cab type vehicle according to the present invention will be described with reference to the drawings.

1 to 3 show a tilt cab motor vehicle 10 of the present invention embodied as a tilt cab truck.
It shows.

The tilt cab type truck 1o includes a chassis 11, a cab 12 disposed on the chassis 11 in front of the chassis 11, and a cab 12 disposed on the chassis 11 in front of the chassis 11; Left and right cab front suspension covers 13 connect the front of the cab 12 to the chassis 11; A cab rear mount (not shown) connected to the cab 12 is mounted on one side of the cab front suspension 13 to rotate the cab 12 between the riding position and the tilted position.・Hydraulic pressure operating cylinder/1 located behind the front suspension 13 and between the chassis 11 and the cab 12;
4, a longitudinal tilt link 15 connecting the operating rod 032 of its operating cylinder/14 to the cab 12, a pair of projections 16 disposed on its operating rod 32, and a pair of projections 16 arranged on its operating rod 32; A pair of protruding clamps 7'17 are arranged at the rear of the cab 12 and at the cab rear mount in order to fix the cab 12 to the chassis 11 in the riding position of the cab 12. and a cab locking device (not shown).

The left and right cab front suspensions 13 are respectively bolted to the chassis 11 (lower platters) 2
G. At the front of the cab 12, between an upper bracket 21 bolted to the underside of the cab 12 and an upper and lower platen (20.21) extending longitudinally of the truck 10, i.e. the engine 11; a tilt shaft 23 rotatably connecting the forward end of the longitudinal link 22 to the lower bracket 20, and a tilt shaft 23 rotatably connecting the rear end of the longitudinal link 2z to the upper bracket 21; a coil spring 25 disposed between the spring seat 27 of its upper bracket 21 and the spring seat 28 of its longitudinal link 22, with one end connected to the tilt shaft 23; The shock absorber 26 is rotatably connected to a pin 29 of the upper bracket 21 at the other end thereof.

The fluid pressure type operation cylinder/14 is a hydraulic cylinder, and the cylinder 31 is the cylinder! ! A piston (not shown) fitted in f31 so as to be able to reciprocate and slide, and an operating rod at one end of the cylinder 31, one end of which can be taken in and out of the outside of the cylinder 31, and the other end connected to the piston. 32, and the cylinder 31 is connected via pipes 33 and 34 to a hydraulic unit (not shown) including a hydraulic power source, a control valve, and the like.

The cylinder 31 is arranged at an appropriate distance behind the tilt shaft 23 and has one end rotatably connected to the chassis 11 via a pin.

Further, the operating rod 32 is rotatably connected to the other end of the vertical tilt link 15, that is, to the rear end side via a pin 36.

The vertical tilt link 15 is disposed extending in the longitudinal direction of the chassis 11 on an upper bracket 21 consisting of a pair of suspension plates 30 placed at appropriate intervals in the lateral direction of the truck 10.

In such a way, the longitudinal tilt link 15 arranged between the hanging plates 30 has a pin 35 above the connecting shaft 24 connecting the longitudinal link 22 of the cab front suspension 13 to the upper bracket 21. one end, i.e., the tip, through the upper bracket 21. That is, it is rotatably connected to the suspension plate 30, and the operating rod 32 is rotatably connected to the rear end side via a pin 36.

As a result, the longitudinal tilt link 15 extends at its rear end side behind the tilt shaft 23, thereby reducing the bending load acting on the operating cylinder 14.

The vertical tilt link 15 also moves the upper bracket 21. when the hydraulic cylinder 14 is actuated. That is, the support of the hanging plate 30 is provided with a step (not shown) for pushing a seat (not shown).

A pair of protrusions 16 protrude from the operating rod 32 on the side of the pin 36 connecting the operating rod 32 to the vertical tilt link 15, preferably in close proximity to the pin 36 thereof.

Furthermore, the protrusion 16 projects from the operating rod 32 in an axial direction substantially parallel to the axis of the pin 36. In other words, the protrusion 16 projects from the operating rod 32 in an axial direction substantially parallel to the axis of rotation of the tip of the operating rod 32 rotatably connected to the longitudinal tilt link 15. . Furthermore, if the protrusion 16 is formed in the shape of a flange or barrel, the protrusion 16 of such shape is substantially parallel to the axis of rotation of the tip of the operating rod 32 rotatably connected to the vertical tilt link 15. It protrudes from the outer peripheral surface of the operating rod 32 in the direction including the axis.

Further, the tip of the protrusion 16 is processed into a curved surface, as shown in FIG. 3, in order to improve sliding contact and seating with a pair of protrusion flanges 17, which will be described later.

A pair of protruding flanges 17 are used when the cab 12 is raised relative to the chassis 11 about its tilt shaft 23 from a riding position to a tilted position.
In order to make sliding contact while hooking the upper bracket 21, that is, the hanging plate 30, the upper bracket 21 is formed by cutting out the rear part of the hanging plate 30, and is configured with a curved seat surface 37 that is substantially aligned with the locus of the projection 16. ing.

Therefore, when the operating cylinder/14 is driven and the cab 12 is rotated and tilted around the tilt shaft 23, the protrusion clamp 7'17 slides the protrusion 16 forward on the curved seating surface 37. While moving, the protrusion 16 is seated in front of the curved seat surface 37, and the step of the vertical tilt link 15 is held pressed against the seat of the suspension plate 30, and the center of gravity of the cab is This reliably prevents the cab 12 from tilting forward beyond the tilt shaft 23. On the other hand, when the cab 12 is in the riding position, the protruding flange 17 releases the protrusion 16, allowing the cab 12 free movement relative to the chassis 11.

The protruding flange 17 is formed into a notched curved seating surface, but it is also formed into a curved groove formed on the inner surface of the hanging plate 30, which protrudes from the inner surface of the hanging plate 30. It can be configured as a curved flanse or a curved rib, or even a curved step.

The truck 10 also includes a mechanical stone 918 for the hydraulic cylinder 14.

The mechanical stopper 18 has a stone parr 38 rotatably connected to the other end, that is, the rear end, of the vertical tilt link 15 via a pin 39, and the stopper par 38 is always connected to a hydraulic cylinder. 14.

The stopper 38 forms a notch 41 at the tip, so that when the cab 12 is tilted, the cab 12
its notch 41 so that it is held in a tilted position
is engaged with Franz 42 of hydraulic cylinder/14.

The coil spring 40 is wound around the pin 39 and is hooked to the vertical tilt link 15 at one end and to the stone bottle par 38 at the other end.

In the mechanical stopper 18, the stopper?
- A par 38 is rotatably connected to the rear end of the longitudinal tilt link 15 via a pin 39, but the stone/!・Par 38 is operated in the same way by operating rod 32.
It is also possible to attach it to

Next, the cab tilt operation of the truck 10 described above will be explained.

In the truck 10, if the cab 12 is placed in the riding position as shown in FIGS.
Since the operating rod 32 has been retracted into the cylinder/31, the projection 16 located on the operating rod 32 is disengaged from the projection clamp 17, so that the cab 12 is attached to the chassis 1.
1 is allowed, and the cab 12 is elastically supported on the chassis 11. As a result, when the trunk 10 is running, vibrations on the side of the shaft 11 are transmitted to the cab 12.
The deterioration of the riding comfort of the cab 12 due to the locking action of the hydraulic cylinder 14 is prevented.

Also, if the cab 12 is rotated around the tilt shaft 23 and lifted from the riding position to the tilted position by the hydraulic cylinder 14 as shown in FIG. , the step of the vertical tilt link 15 abuts the cab 12, that is, the support of the suspension plate 30 of the upper bracket 21 abuts the seat, and while the cab 12 is rotated around the tilt shaft 23, the operation cylinder 14 is operated. cab 12
lift upwards.

When the cab 12 is rotated around the tilt shaft 23 until the center of gravity of the cab approaches the upper part of the tilt shaft 23, the protrusion 16 becomes the protrusion clamp f17, i.e.
It is hooked onto the curved seat surface 37 and slides on the curved seat surface 37 while maintaining that state, and at the position shown in FIG. , the center of gravity of the cab is prevented from tilting forward beyond the tilt shaft 23, and the chassis 1
1 and held in a tilted position. Also, at this time, the stone A' par 38 is engaged with the 7-run no. 42 of the hydraulic cylinder/14 by the coil spring 40, so that
The cab 12 is securely held in the tilted position.

Therefore, inspection and maintenance work on the engine becomes possible.

According to the above invention, there is provided a hydraulic operating cylinder for lifting and lowering the cab from the riding position to the tilted position and from the tilted position to the riding position with respect to the chassis.
One of the cylinders and the operating rod of the operating cylinder extends rearwardly of the tilt shaft and is rotatably coupled to the cab via a longitudinal tilt link disposed longitudinally of the chassis so that the cab is When the cab is in the riding position with respect to the chassis, that is, in the running position, the relative free movement of the cab with respect to the chassis is smoothly guided, especially against the free movement of the cab when a large load is applied. , the cab is guided smoothly, and the bending load is less likely to be applied to the operating cylinder. The life of the cab is increased, and as the cab is raised from the riding position to the tilted position around the tilt shaft relative to the chassis, the center of gravity of the cab is moved beyond the tilt shaft, and the cab is moved further forward. When the cab tries to tilt, the tilting movement of the cab relative to the chassis is reliably suppressed by the protrusion formed on the cylinder and one of the operating rods, and the protrusion flange on the cab side, thus smoothing the free movement of the cab. The means for controlling the tilting motion of the cab and the means for suppressing the tilting movement of the cab are not made large, and the mechanical strength of these means is improved, the structure is simplified, the number of parts is reduced, and the manufacturing cost is reduced. It also becomes extremely practical.

[Brief explanation of the drawing]

FIG. 1 is a partial front side view of a tilt cab type truck embodying the present invention with the cab in the riding position, and FIG. 2 is a partial front side view of the truck shown in FIG. 1 with the cab in the tilted position. Figures 3 and 3 are 3- in Figure 1.
FIG. 3 is a cross-sectional view taken along line 3; DESCRIPTION OF SYMBOLS 10... Tilt cab type truck, 11... Shan, 12... Cab, 13... Cab front suspension 7, 14... Fluid pressure type operation cylinder,
15...Vertical tilt link, 16...Protrusion,
17...Protrusion clamp.

Claims (1)

[Scope of Claims] A chassis; and a chassis rotatably coupled to the chassis through a tilt shaft at the front of the chassis so as to be rotated between a riding position and a tilted position; The cab is elastically supported and cylinder! , that Shirin! A piston fitted in the cylinder so as to be able to reciprocate and slide therein, and an operating rod whose one end can be taken in and out of the outside of the cylinder and whose other end is connected to the piston.・A hydraulic operating cylinder with one of its cylinder and operating rod rotatably connected to the chassis at the rear of the shaft! and a longitudinal section extending rearwardly of the tilt shaft, disposed longitudinally of the chassis, and rotatably connected at one end to the cab and at the other end to the other end of the cylinder and operating rod, respectively. t! on the other axis of rotation of the tilt link and its cylinder and operating rod rotatably connected to the longitudinal tilt link.
a projection disposed on the other of the cylinder and the operating rod in a direction including parallel axes; A tilt-cab type motor vehicle including a protruding clamp disposed on the eight-ybeam so as to be hooked thereon.