JPS5874857A - Controller for inclination of cab - Google Patents

Abstract

PURPOSE:To tilt the cab of a cab-over type truck in plural stages by a method in which an alarm is provided in parallel in the series circuit of a tilting relay coil and a starting switch and also normally open switch operating at plural tilting positions is connected in series. CONSTITUTION:When tilting a cab 12 forwardly, a lock switch 3 is closed when a lock mechanism is unlocked, a starting switch 4 is closed, and an operation lever 34 is inclined to the left, whereupon a switch 6 is closed. Then, an alarm 8 sounds, a relay coil 5 is excited, a motor 7 is operated, and by its oil pressure, a cylinder 19 is extended and inclined. When reaching the first inclination, a projection 27 is coupled with a notch 30, a contact piece 6a is pushed by a plate 26, and the switch 6 is opened. When tilting it further forwardly, the coupling between the projection 27 and the notch 30 is released when pulling a knob 23, at the same time the contact piece 6a is released, the circuit is closed, and the motor 7 is again actuated. Afterwards, when the projection 27 couples with the notch 30 below the stay 25, the operation is stopped and the alarm 8 is also stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a tilting cab 1113 for a cab-over type truck.
II This is related to @ placement.

In this type of truck, the engine is located below the cab, so when performing inspections and repairs, the cab must be tilted forward.

Conventionally, it has been proposed to perform such cabling using a hydraulic actuator, but this is disadvantageous in terms of cost because the control circuit for the hydraulic actuator is complex and a large number of switches are used.

An object of the present invention is to provide a cab tilt l1 that allows the cab to be tilted in multiple stages using a single switch.
lI@1III! It's about getting a position.

Therefore, in the configuration of the present invention, a series circuit consisting of a relay coil and a start switch for operating a cab tilting actuator and an alarm are connected in parallel with each other to form a parallel circuit, and the cab is connected in series with the parallel circuit. A normally closed switch is connected to the power supply that opens the circuit when the tilt position reaches a plurality of predetermined tilt positions.

To explain the present invention based on an embodiment, FIG. 1 shows a drive device including a motor 7 that drives a hydraulic pump as a power source of a hydraulic actuator for cab tilting, and an alarm 8. As shown in FIG. An alarm 8 is connected in parallel to the series circuit consisting of the starting switch 4 and the relay coil 5, and this parallel circuit is connected to the vehicle battery 2 together with the normally closed switch 6 for cab tilting and the cab lock switch 3, which perform two-stage operation. Connected. Also, a relay switch 5a that closes the circuit when the relay coil 5 is excited for the battery 2 &
and -117 are connected in series.

The cab tilting switch 6 normally closes the circuit so that the cab can be moved to a plurality of predetermined tilting positions, e.g. 40° and 70°.
When it becomes ''', the @ path starts to open.

The above-mentioned hydraulic actuator 21, as shown in No. 28i1, has a rod 18 coupled to a piston placed inside a cylinder 19, and the end of the cylinder 19 is connected to the vehicle body side with a pin 24, and the rod 18 The tip of the tilt lever 16 is connected to the middle portion of the tilt lever 16 with a pin 17. The tip of the tilt lever 16 supports the bottom of the cab 12 via the binding material 15, and the base end is movably supported by the vehicle body with the torsion bar 14. The cab 12 is tiltably supported by a support shaft 13 at a portion immediately above the torsion bar 14 .

A stay 25 is supported by a pin 28 in the middle part of the tilt lever 16 so as to be movable in the upper direction of the cylinder 19. It is designed to fit into the surface, and for this reason,
A spring 31 is hooked between the tip of the stay 25 and the cylinder 19. A saw-shaped notch 30 on the lower surface of the stay 25
is provided, and a protrusion 27 that engages with the cylinder 19←notch 30 is provided. Further, a plate 26 projecting laterally is coupled to the upper surface of the stay 25, and the switch 6, which has a contact piece 6a that can abut against this plate 26, is located on the side of the cylinder 19! Identified by the department. Furthermore, a lever 29 that can be fitted to the plate 26
However, this intermediate portion is supported by the side wall portion of the cylinder 19 with a support shaft 20. This lever 29 is connected to the remote control wire 2
When the second knob 23 is pulled, it hits the plate 26 and pushes up the stay 25.

The circuit of the hydraulic actuator 21 is constructed as shown in FIG. That is, the pressure liquid from the hydraulic pump 35 driven by the motor 7 is applied to one of the two end chambers of the cylinder 19 partitioned by the piston 32, and the liquid in the other liquid chamber is returned to the liquid tank 37. There is.

The directional switching valve 33 is operated by an operating lever 34, and the aforementioned starting switch 4 is disposed on the operating lever 34. However, the activation switch 4 may be placed at any other suitable location.

Note that 36 is a relief valve that is connected between the discharge port of the hydraulic pump 35 and the liquid tank 37, and releases abnormal pressure to the liquid tank 37.

In the above m-device, when tilting the cab 12 forward about the support shaft 13 from the normal state, first remove the known locking mechanism that locks the rear end of the cab 12 to the vehicle body. Then, when the starting switch 4 is closed and the operating lever 34 is tilted to the left, the switch 6 is closed, so the alarm 8 starts sounding and the relay coil 5 is energized. . Then, the switch 5a is closed and the motor 7 is driven. A cylinder 19 is connected to a hydraulic pump 35 driven by this motor 7.
Pressure fluid is supplied to the left end chamber of the piston rod 18, the piston rod 18 is exposed upward, and the tilt lever 16 is rotated counterclockwise in FIG. W42 around the torsion bar 14.

In this way, when the cab 12 reaches a predetermined first stage of inclination, the protrusion 27 of the cylinder 19 engages with the notch 30 on the upper side of the stay 25. At this time, the contact piece 6 is
a is pressed and switch 6 opens the circuit. Therefore, the motor 7 stops and the hydraulic actuator 21 also stops.

Alarm 8 also stops sounding. The load of cab 12 is cylinder 19
It is supported by the engagement between the protrusion 27 and the notch 30 of the stay 25.

If you want to further tilt the cab 12 forward, use the knob 23.
When the release lever 29 is rotated clockwise about the support shaft 20, the stay 25 is pushed up and the protrusion 27
The engagement with the notch 30 is released. At the same time, contact piece 6a is released from plate 26, closing the circuit again. therefore,
The motor 7 is driven, the piston rod 18 of the hydraulic actuator 21 further protrudes upward, and the tilt lever 16
The cab 12 is tilted forward. Then, when the protrusion 27 engages with the notch 30 on the lower side of the stay 25, the switch □chiro opens, the motor 7 stops, and the alarm 118 stops sounding, as in the case described above. When you let go of the operating lever 34,
The directional valve 33 returns to its neutral position and blocks the hydraulic circuit.

Next, Ki1? To return the cylinder 12 to its original position, first pull the knob 23 and operate the release lever 29 to release the engagement between the notch 30 of the stay 25 and the protrusion 27 of the cylinder 19.

Next, when the start switch 4 is closed and the operating lever 34 is pulled back to the right, the alarm 8 starts sounding. Further, the relay fill 5 is excited, the switch 5a is closed, and the motor 7 is driven.

Then, the liquid is supplied from the hydraulic pump 35 to the left end chamber of the cylinder 19, the piston rod 18 is retracted, and the tilt lever 16 is moved clockwise. And protrusion 27
When the lever engages with the notch 30 on the upper side of the stay 25, the switch 6 opens, the motor 7 stops, and the cab 12 stops at the first stage of inclination. When 25 is pushed up, switch 6 is closed, alarm 8 starts sounding, motor 7 is driven, and cab 12 is returned by hydraulic actuator 21.

When the cab 12 returns to the normal state shown in FIG. 2, a locking mechanism (not shown) operates to lock the cab 12 to the vehicle body, and the cab lock switch 3 opens, causing alarm-8.
The sound stops and the motor 7 stops.

Since the present invention is configured as described above, while the cab 12 is tilting, the alarm I8 sounds both when the cab 12 is tilted forward and when it is returned to the normal position, thereby calling the operator's attention.

Furthermore, when the cab 12 is tilted to two predetermined positions, the load of the cab 12 is supported by the engagement between the protrusion 27 of the hydraulic actuator 21 and the notch 30 of the stay 25. Even if there is, there is no fear that the cab 12 will start moving. Furthermore, the alarm circuit of such an alarm device is advantageous in terms of cost in that it is activated by the 1- switch 6 for two levels of inclination of the cap 7.

[Brief explanation of drawings]

Figure 1 is an electric circuit diagram of the cab tilting control 'IHkH according to the present invention, Figure 2 is a side view of a cab tilting device to which the W4M device is applied, and Figure 3 is a hydraulic circuit diagram of a cab tilting actuator. be. 2: Electric II 3: Cab lock switch 4: Starting switch 5: Relay coil 5a: Relay switch 6
: Cab tilting switch 7: Motor 8: Alarm W 1
2 knee 1'pu 13: Support shaft 16: Chi JL. Trevor 20: Support shaft 21: ll pressure actuator 25 Nisty 27 = protrusion 29: llF release lever
30: Notch 33: Directional switching valve 34: Operation lever 3
5: Hydraulic pump patent applicant: Isuzu Automobile Co., Ltd. Daisanjin Patent attorney: Toshio Yamamoto

Claims (2)

[Claims] (1) A line circuit consisting of a relay coil and a starting switch for operating the cab tilting actuator and an alarm are connected in parallel to each other to form a parallel circuit, and in series with the parallel circuit, the cab is connected to a predetermined plurality of Cab tilting control device consisting of a normally closed switch connected to the power supply that opens the circuit when the tilted position is reached. (2) A cab tilting actuator connected to the bottom side of the cab and the heavy body side, and a stay that is slidable along the IJ of the cab tilting actuator and one end of which is pivotally supported on the cab side. a locking means having a protrusion provided on one of the opposing φ faces of the cab tilting actuator and the stay and a notch that engages with the protrusion provided on the other side; The normally closed switch is supported by a wall of the cab tilting actuator and has one end that abuts against the stay to act as a release lever for releasing the locking means. Claim (1): When engaged with the notch, the contact piece abuts against the stay to open a circuit.
Cab tilting control 1 @ leprosy described in.