JPS58101877A - Tilt cab type automobile - Google Patents

Abstract

PURPOSE:To simplify a means for restricting the tilting motion of a cab by providing an ensured operating cam mechanism which consists of both a pair of rollers which are disposed at one end of a rod of a cylinder for tilting a cab and an approximately inversed L-shape cam groove which is formed in the cab. CONSTITUTION:A hydraulic type operation cylinder 14 is disposed between a chassis 11 and a cab 12, and a roller holder 34 is fixed at the end of an operation rod 31 of the cylinder 14. A pair of rollers 15 and 16 are rotatably fit to a holder 34 by pins 36 and 37 at certain intervals in the axial direction of the operation rod 31. A cam groove 17 is formed in the upper bracket 21 which is fixed to the cab 12, the contour thereof looking like an inversed approximately L-shape which consists of a cab floating groove part 38 and a cab locking part 39. Said rollers 15 and 16 are fit in the cam groove 17 and when the cab is tilted, the roller 15 is shifted from the groove part 38 to another 39 until contacting the end of the latter part 39, whereby the cab 12 may be held at the tilted position.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement in a tilt cab type motor vehicle.

Traditionally, this type of tilt-cab vehicle rotates the cab relative to the chassis into a tilt bin, lifting the cab from a riding position to a leaning position, and moving the cab from a leaning position to a riding position. For lowering it is equipped with a hydraulic jack, i.e. a hydraulic operating cylinder.

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 also for moving the cab from the riding position. In the overtilt position (overtilt range) where the center of gravity of the cab is tilted forward beyond the tail toe 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 slidably fitted into the bearing hole of a trunnion rotatably held in the cab bracket, and the hydraulic jack is connected to the cab, allowing free movement of the cab relative to the chassis. Moreover, the trunnion must be made thicker or made of expensive material in order to provide sufficient mechanical strength; Due to its structure, it is made of multiple fibers and requires advanced technology to manufacture, making it expensive.

An object of the present invention is to smooth the free movement of the cab when the cab is in the riding position relative to the chassis, that is, in the running position, and to prevent the cab from tilting with respect to the chassis. When the cab is lifted from the riding position to the tilted position around the chassis, and the cab's center of gravity crosses the tail shaft and the cab tilts forward, the tilting movement of the cab relative to the chassis can be reliably suppressed. The cab tilting means 1 is connected between the shaft and the cab, and in particular, one end of the cab tilting means is connected to one of the chassis and the cab, and further, the cab tilting means is connected to one end of the cab, and the cab tilting hand 1 is connected between the shaft and the cab, and in particular, one end of the cab tilting means is connected to one of the chassis and the cab, and further, the cab tilting hand 1 is connected between the shaft and the cab, and is connected to The means for smoothing and suppressing the tilting movement of the cab improves mechanical strength, simplifies the structure, reduces the number of parts, and reduces manufacturing costs without increasing the size of the cab. ,
To provide a tilt-cab type automobile which facilitates maintenance and inspection and transmits the force of a cab-tilt means to the cab without strain.

To solve these problems, the tilt-cab type vehicle of the present invention is provided with a hydraulic operating cylinder as the cab tilting means, and further has a cylinder of the operating cylinder and the other end of the operating rod connected to the operating cylinder. a pair of rollers arranged at a predetermined distance in the axial direction;
It is disposed in the cab behind the tilt shaft, has an opening in a plane orthogonal to the tilt shaft, and has a bent portion located on the tilt shaft side to fit the pair of rollers. It is equipped with a deep inverted oval-shaped cam groove.

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 5 show a tilt cab motor vehicle 10 of the present invention embodied as a tilt cab trunk.
It shows.

The tilt cab type truck 10 includes a chassis 11, a cab 12 disposed on the chassis in front of the chassis 11, and a cab 12 disposed on the chassis 11,
Left and right cab front φ suspensions 4 connect the front of the cab 12 to the chassis 11 so as to elastically support it above.
a cab rear mount (not shown) that enables the rear of the cab 12 to be connected to the chassis 11 so as to elastically support the cab 12 on the chassis 11; A hydraulic operating cylinder 14 is arranged between the chassis 12 and the cab 12 behind the cab flow suspension 13 so as to rotate between the riding position and the tilted position; A pair of rollers is and xa are arranged on the operating rod of the operating cylinder 14 at a predetermined distance in the axial direction of the cylinder 14, and a pair of rollers is and xa are arranged on the cab 12 at the rear of the cab front suspension 13. One cam groove in which the rollers 16, 16 are fitted, and a cam groove arranged at the rear of the cab 13 and the cab rear mount in order to fix the cab 13 to the chassis 11 in the riding position of the cab 12. and a cab locking device (not shown).

The cab front suspension 13 is disposed in front of the truck IO and between the chassis 11 and the cab 12 on the left and right sides, and each is connected to a lower bracket 20 that is bolted to the chassis 11. , in front of the cab 12, an upper bracket 21 delt-tightened to the lower surface of the cab 12, and the truck lO1.
That is, a longitudinal link 22 extending in the longitudinal direction of the chassis 11 and arranged between its upper and lower brackets 21, 20, and a front end of the longitudinal link 22 being rotatable to its lower platter 20. a connecting shaft 24 rotatably connecting the rear end of its longitudinal link 22 to its upper platen 21; and a spring of its upper bracket 21; and a spring of its longitudinal link 22; - Sheet 28
and a coil spring 25 disposed between the tilt shaft 23 at one end and the upper platoon 21 at the other end.
29, each of which is rotatably connected to the bin 29 of
It is composed of an apunpa 26.

The hydraulic operation cylinder 14 is a hydraulic cylinder, and includes a piston (not shown) fitted into the cylinder 301 so as to be able to reciprocate and slide, and one end of the cylinder 30 is inserted into and taken out from the outside of the cylinder 30. an operating rod 3 with its other end connected to its piston;
1, the cylinder 30 is a hydraulic power source device,
Piping 32 is connected to a hydraulic unit (not shown) including a control valve, etc.
It is connected via ゜33.

The cylinder 30 is placed at an appropriate distance behind the tilt shaft 23, and has one end rotatably connected to the chassis 1N via a pin. ``Furthermore, the operating rod 31 has a roller holder 34 fixed to its other end.

The roller holder 34, as shown in FIG.
A connecting hole 35 is provided at the lower end and extends in the optical axis direction, and the other end of the operating rod 31 is fitted into the connecting hole 35 and welded to the operating rod 31.

The cab side roller Is, 1 is attached to the sono roller life holder 34.
5 and chassis side rollers 1g, 1g are rotatably supported via pins 36, 37 at a predetermined interval in the axial direction of the operating rod 31.

These cab side and chassis side rollers 15.15 and 16.16 are connected to pins
, a pair of cam grooves 1 arranged in the cab 12, which are rotatably fitted to both ends of the a70 and prevented from being removed.
It is embedded in 7.

The cam groove 17 is aligned with a predetermined interval in the lateral direction of the track 10, that is, the interval between the rollers 15, 15 and 11. Each part is stamped.

The cam groove 17 includes a cab floating groove portion 38 located in the height direction of the truck 10 when the cab 12 is in the riding position, and a cab lock groove portion 39 located in the longitudinal direction of the truck 1G. It is constructed in the shape of an inverted road.

The cab 70-ting groove portion 38 and the cab locking groove portion 39 are connected to each other, as shown in FIGS. 1 and 2, so that when the cab 12 is tilted, the cab-side rollers 15.15 are attached to the cab. - Smooth movement is possible from the floating groove portion 38 to the cab lock groove portion 39.

Also, when the cab 12 is in the riding position, the cab floating groove portion 3B is connected to the cab side and chassis side rollers 15.1, as shown in FIGS. 4 and 5.
5 and 16.16 in the vertical direction, allowing the cab 12 to float with respect to the chassis 11.

Cab side and chassis side rollers 1 configured as such
5, 15 and 16.16 and the pair of cam grooves 17 can be reduced to one if the roller holder 34 is configured in a U-shape. It is something that can be transformed.

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

In the truck IO, if the cab 12 is in the riding position as shown in FIG. 1, the operating rod 31 is retracted into the cylinder 30, so the cab side and chassis side rollers and 16.1
8 is guided upwardly and downwardly within the cab floating groove portion 38 of the cam groove l, as shown in FIGS. 4 and 5, so that the cab 12 is allowed to move relative to the chassis 11. The cab 12 is elastically supported on the chassis 11, that is, supported in a floating state. As a result, when the truck 10 is running, vibrations on the chassis side are not directly propagated to the cab side, and the operating cylinder 1
The deterioration of the riding comfort of the cab 12 due to the locking action of No. 4 is prevented.

Further, the operation cylinder 3 cylinder 14 is driven, and the operation rod 31
is pushed out to the other end of the cylinder 3o, and the cab side roller I
As s and Is push up the cab 12 through the cam groove 17, the cab 12 is rotated about the tilt-shaft 23 and lifted from the riding position to the tilting position, as shown in FIG.

As the cab 12 is rotated about the tilt shaft 23 by the operating cylinder 14 so that the center of gravity of the cab approaches the upper part of the tilt shaft 23, the cab side rollers 15° 15 move away from the cab floating groove portion 38. Move to the cab lock groove part 39,
When the center of gravity of the cab approaches the upper part of the tilt shaft 23, the cab side rollers 15, 15 hit the ends of the cab lock groove portions 39, and are in the position shown in FIG.
The operating cylinder is stopped and the cab 12 is held in a tilted position on the chassis 11, with the center of gravity of the cab prevented from tipping forward beyond the tilt shaft 23.

According to the above invention, the hydraulic operating cylinders for lifting and lowering the cab from the riding position to the leaning position and from the leaning position to the riding position with respect to the chassis are spaced at a predetermined distance in the axial direction of the operating cylinders. The so-called
Since the positive cam mechanism is connected between the chassis and the cab, the cab is smoothly guided relative to the chassis from the riding position to the tilted position, and from the tilted position to the riding position.
Also, when the cab is in the riding position relative to the chassis, that is, in the running position, the free movement of the cab is smoothed, and the cab rides on the rotating shaft of the tilt shaft relative to the chassis. When the cab is lifted from the tilting position to the tilting position and the cab is tilted forward with the center of gravity of the cab exceeding the tilt six shaft, the tilting movement of the cab relative to the chassis is reliably suppressed, and
As such, a hydraulic operating cylinder, i.e., a cab-tilt means, is coupled between the chassis and the cab, and yet allows and smoothes free movement of the cab when the cab is in the riding position. , when the cab is in the tilted position, the center of gravity of the cab tilts forward beyond the tilt shaft, and the mechanical strength of the means for suppressing the tilting movement of the cab is improved without increasing the size; The structure is simplified, the number of parts is reduced, manufacturing costs are reduced, maintenance and inspection are easy, and the force of the cab pot tilting mechanism is easy and trouble-free. transmitted to the cab.

[Brief explanation of the drawing]

FIG.
Figure 2 is a partial front side view of a cab-type truck with the cab in the riding position, with a portion cut away.
A partial front side view of the truck cab shown in FIG. 1 in a tilted position; FIG. 3 taken along line 3-3 in FIG. 1;
The sectional view and FIGS. 4 and 5 are views showing the relationship between the cam groove and the roller when the cab is in the riding position in the truck shown in FIG. 1. 10... Tilt cab type truck, ll... Chassis, l... Cab, 13... Cana O front.
Suspension john, 14...Fluid pressure type operation cylinder, 1
5.16...Pair of rollers, 17...Cam groove, 20
... Lower bracket, 21 ... Upper bracket, 2
2... Vertical link, 23... Tilt shaft, 24... Connection shaft, 38... Floating groove portion in the cab, 39... Cab lock groove portion. −
Figure 1 Figure 3

Claims (1)

[Claims] A tilt shaft rotatably coupled to the chassis at the front of the chassis through a tilt shaft so as to be rotated between a riding position and a tilted position; A cab elastically supported by a cylinder, a piston fitted into the cylinder so as to be able to reciprocate, and one end of the cylinder capable of being put in and out of the outside of the cylinder, and the other end of the cylinder being inserted into and out of the outside of the cylinder. □A hydraulic operating cylinder consisting of an operating rod connected to a piston, and one end of the cylinder and operating rod rotatably connected to the chassis behind the tilt shaft; a cylinder of the operating cylinder; A pair of rollers arranged at a predetermined distance in the axial direction of the operating cylinder on one of the other ends of the operating cylinder, and a pair of rollers arranged in the cab behind the tilt Φ shaft and connected to the tilt shaft. The opening is in a perpendicular plane, and
A tilt-fist cab-type automobile including an inverted curving cam groove in which the bent portion is located on the tilt shaft side and the pair of rollers are fitted therein.