JP2592460Y2 - High-speed driving restriction device in cab movable wheel crane - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention enables a driver's cab for traveling and crane work to be moved between a traveling position moved forward with respect to a swivel base and a crane working position moved backward. The present invention relates to a high-speed travel restricting device for a cab movable wheel crane attached to a vehicle.

[0002]

2. Description of the Related Art Wheelcrews conventionally used.
In order to improve the operability during the crane work, the cab fixedly mounted a driving cab for both traveling and crane work at a position rearward of the turntable. For this reason, the telescopic boom stored on the swivel table in a laid-down state impedes the visibility of the front left of the vehicle during traveling and there is a problem that the safety of the right-moving vehicle cannot be sufficiently confirmed at an intersection or the like. .

For this reason, a driving cab for both traveling and crane work is movably mounted between a traveling position moved forward and a crane working position moved rearward with respect to the swivel table, and the traveling cab is moved during traveling. A cab-movable wheel crane A has been developed and put into practical use so that the driver's cab can be moved to a running position so that the safety confirmation of the left front of the vehicle can be directly visually confirmed.

[0004] The cab movable wheel crane A
Referring to FIG. 2, a transmission 1 having a plurality of shift speeds is provided, and an output from an engine 2 is shifted to a predetermined speed ratio by the transmission 1 to drive the drive wheels 3 and 3 to travel. Traveling vehicle 4 configured as above
A swivel 5 mounted on the traveling vehicle 4 so as to be able to swing and drive, a telescopic boom 6 having its base end pivotally driven up and down on the swivel 5 and one side of the telescopic boom 6 On the revolving base 5 between a traveling position (a position shown by a solid line in FIG. 2) with respect to the revolving base 5 and a crane working position (a position shown by a chain line in FIG. 2) which is moved rearward. The cab 7 has a cab 7 for both traveling and crane work.

[0005]

SUMMARY OF THE INVENTION However, the cab-movable wheel crane A constructed as described above has the following problems.
When the driver's cab 7 is moved to the traveling position, since the driver can directly look at the traffic condition in front of the vehicle from the front of the telescopic boom 6 stored in the lying state, the driver can drive at high speed. In this case, the vehicle can travel relatively safely, but if the driver's cab 7 is moved to a position other than the traveling position, the telescopic boom 6 impedes the view of the front left of the vehicle, and the safety is sufficiently confirmed. There is a problem that driving at high speed is dangerous.

The present invention has been made to solve the above problems.
When the cab 7 is moved to a position other than the traveling position,
It is an object of the present invention to provide a high-speed travel restricting device in a cab movable wheel crane that restricts a traveling movement at a high speed.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the high-speed traveling restricting device in the cab movable wheel crane of the present invention is constituted as follows. In other words, a traveling vehicle that includes a transmission having at least a high-speed transmission mechanism and a low-speed transmission mechanism, and that drives the driving wheels by driving the drive wheels by shifting the output from the engine to a predetermined gear ratio by the transmission. A swivel mounted on the traveling vehicle so as to be capable of swiveling, and a movable position on the swivel between a traveling position moved forward with respect to the swivel and a crane working position moved backward. A cab movement detecting means for detecting that the cab has moved to a traveling position in a high-speed traveling restricting device in a cab movable wheel crane having an cab for both traveling and crane work mounted. And transmission control means for selectively switching a transmission mechanism of the transmission. When it is detected that the transmission has shifted to the position, the shift changeover to the high-speed shift mechanism among the transmission shift mechanisms is permitted, and otherwise, the shift change to the high-speed shift mechanism is restricted. It is characterized by the following.

[0008]

In the high-speed traveling restricting device of the present invention constructed as described above, the driver's cab movement detecting means detects this movement when the driver's cab in which the safety of the left front of the vehicle can be sufficiently confirmed is moved to the traveling position. Since the shift control means that receives this signal allows the shift to be switched to the higher-speed transmission mechanism of the transmission transmission mechanism, high-speed traveling using the higher-speed transmission mechanism is possible. It becomes. When the driver's cab, in which the safety of the front left of the vehicle cannot be sufficiently confirmed by the telescopic boom, is moved to a position other than the traveling position, this movement is detected by the driver's cab movement detecting means. Since the control means restricts the shift change to the high-speed transmission mechanism, the high-speed transmission mechanism cannot be used and the high-speed traveling is restricted.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. A and 1 used in the description of the prior art
The reference numerals 7 to 7 are used as being synonymous in the following description.

FIG. 1 shows an entire system of a high-speed travel restricting device in a cab movable wheel crane A. The cab movable wheel crane A of this embodiment.
Uses a power shift transmission 10 having three forward speeds and one reverse speed as a transmission. The output from the engine 2 is automatically shifted by a torque converter 11 once, and then the power is transmitted. The gears are input to the shift transmission 10 and shifted to a predetermined gear ratio, and the output is transmitted to the front wheel axle 31 and the rear wheel axle 32 via the propeller shafts 30a and 30b, and the drive wheels 3 and
3 are respectively driven.

The power shift transmission 10 is configured as follows. That is, the torque converter
An input shaft 12 to which an output of the input shaft 11 is input, a gear 13 fixed to the input shaft 12, a gear 14 on one side of the gear 13 loosely fitted to the input shaft 12, and a gear 14 A first clutch 15 for connecting / disconnecting the input shaft 12 to / from the input shaft 12, a gear 16 on the other side of the gear 13 and loosely fitted to the input shaft 12,
A second clutch 17 for operating the on / off operation of the input shaft 12 with respect to the input shaft 12;
An intermediate shaft 19 with one fixed, a gear 20 which is on one side of the gear 18 and is loosely fitted to the intermediate shaft 19 and always meshes with the gear 14, and the gear 20 is connected to and disconnected from the intermediate shaft 19. A third clutch 21 to be operated, a gear 23 on the other side of the gear 18, which is loosely fitted to the intermediate shaft 19 and constantly meshed with the gear 16 via a reverse idle gear 22, and the gear 23. A fourth clutch 24 that is engaged / disengaged with respect to the intermediate shaft 19, and an output in which a gear 25 that is disposed in parallel with the intermediate shaft 19 and is always meshed with the gear 20 and a gear 26 that is constantly meshed with the gear 23 are fixed. And a shaft 27.

In the power shift transmission 10 constructed as described above, the gears 13, 18, 18, 23 and 26 are sequentially engaged with each other by bringing the fourth clutch 24 into contact, thereby forming a first-speed transmission mechanism. It has become. Also, the third
By bringing the clutch 21 into contact, the gears 13, 18, 20, and 25 are sequentially meshed to form a second-speed speed change mechanism. Further, by bringing the first clutch 15 into contact, the gears 14, 20, and 25 are sequentially engaged to form a third-speed speed change mechanism. Also, the second
By bringing the clutch 17 into contact, the gears 16, 22, 23 and 26 are sequentially engaged to form a reverse speed change mechanism. In the case of the present embodiment, the first-speed transmission mechanism corresponds to the low-speed transmission mechanism in the registered claim, and the second-speed and third-speed transmission mechanisms are the high-speed transmission mechanism in the registered claim. Is to be applicable.

The clutches 15, 17, 21 and 24
Are both constituted by a hydraulic clutch, and are controlled by a hydraulic unit 29 based on a control signal from a shift control unit 28 described later.
Controls the supply and discharge of the pressure oil to selectively connect or disconnect each of the hydraulic clutches 15, 17, 21 and 24, so that the speed change mechanism of each speed stage performs a shift.

A power shift transmission of this kind
The gearshift operation 10 is performed by the driver selecting each gearshift range of the gearshift switch 33 provided in the cab 7.
The shift switch 33 has three shift ranges of a range, a range, and a D range as a forward side, and has one shift range of an R range as a reverse side, and according to a shift range selected by a driver, The shift speed of the power shift transmission 10 is controlled as follows. That is, when the shift switch 33 is selected to the forward range, the power shift transmission 10
Is fixed to the first speed, and when the range is selected, the speed is fixed to the second speed, and when the range is selected to the D range, the speed is changed from the first speed to the third speed in accordance with, for example, the vehicle speed and the engine load. The vehicle travels with a speed change between gears. When the shift switch 33 is set to the reverse R range, the vehicle travels with the shift speed fixed to the reverse speed.

Numeral 34 denotes a traveling position in which the operator's cab 7 is moved forward with respect to the turntable 5 (the position shown by the solid line in FIG. 1), and a crane working position in which it is moved backward (the position shown in the chain line in FIG. 1). This is a slide mechanism for moving between. The slide mechanism 34 includes a guide cylinder 35 mounted on the revolving base 5 along with the telescopic boom 6 and an arm slidably inserted into the guide cylinder 35 and extending laterally. A sliding cylinder 37 for supporting the cab 7 by members 36, 36, and a telescopic cylinder 38 for extending and retracting the sliding cylinder 37 with respect to the guide cylinder 35.
It is composed of Reference numeral 39 denotes a fixing device for fixing the cab 7 in the traveling position, that is, the sliding cylinder 37 in a state where the sliding cylinder 37 is fully extended with respect to the guide cylinder 35. And a pin hole 39b drilled at the base end of the sliding cylinder 37.

Reference numeral 40 denotes a cab movement detecting means for detecting that the cab 7 has moved to the running position. In the case of this embodiment, the cab movement detecting means 40 is
The detection switch 40a mounted at an appropriate position at the tip of the 35, and when the cab 7 mounted on the sliding cylinder 37 is moved to the running position, that is, when the sliding cylinder 37 is fully extended with respect to the guide cylinder 35, And a striker 40b which comes into contact with the detection rod of the detection switch 40a when the switch 40a is in the extended position. As a result, when the cab 7 moves to the traveling position, the detection rod of the detection switch 40a comes into contact with the striker 40b and the switch 40a comes into contact, and a detection signal is output to the shift control means 28. I have.

The shift control means 28 includes the shift switch 33
, Ie, a shift signal corresponding to the shift range selected by the driver, and a detection signal corresponding to the movement state of the cab 7 output from the cab movement detection means 40. I have. The shift control means
The unit 28 receives these signals and outputs a control signal to a hydraulic unit 29 for controlling the shift speed of the power shift transmission 10 as follows. That is, when the cab 7 is located at the traveling position, the movement state of the cab 7 is detected by the detection switch 40a,
When the switch 40a comes into contact, the shift switch
A control signal is output to the hydraulic unit 29 so that the shift speed (first speed to third speed, and reverse speed) of the power shift transmission 10 corresponding to the speed change signal output from 33 is selected. Has become. On the other hand, in a state where the cab 7 is moved to a position other than the traveling position, the moving state of the cab 7 is detected by the detection switch 40a, and when the switch 40a is turned off, the shift switch 33 Regardless of the output shift signal, a control signal is output to the hydraulic unit 29 so that the shift speed of the power shift transmission 10 is the first speed or the reverse speed.

Next, the operation will be described. First, a description will be given of a case where the wheel crane A is moved while the cab 7 is moved to the traveling position. In this state, the driver's cab 7 is largely moved in front of the swivel base 4 and vehicles traveling in front of the vehicle from the front of the telescopic boom 5 to the left front can be sufficiently confirmed. This is a traveling state in which traveling can be performed relatively safely.

When the cab 7 is moved to the traveling position, the movement of the cab 7 is detected and the detection switch 40a is brought into contact. Upon receiving this signal, the travel control means 28 selects the gear position of the power shift transmission 10 corresponding to the gear shift signal output from the gear shift switch 33 to the hydraulic unit 29 for switching the gear position of the power shift transmission 10. Outputs control signal. That is, the shift switch
When the range 33 is selected, a control signal for selecting the first speed is output. When the range 33 is selected, a control signal for selecting the second speed is output.
When the range is selected, a control signal for selecting an optimal shift speed from the first speed to the third speed according to, for example, the vehicle speed and the engine load is output. This allows
Since the power shift transmission 10 selects each of the first to third speeds based on the control signal, for example, if the shift switch 33 is selected to the D range, the power shift transmission 10 can operate at a high speed in accordance with the vehicle speed and the engine load. High-speed traveling using a speed change mechanism (second speed or third speed) is enabled.

The high-speed running using the high-speed gear mechanism as described above is possible only when the shift switch 33 is set to the range or the D range. Therefore, when the driver selects the shift switch 33 in the range in order to climb a steep hill, the shift speed is fixed to the first speed, so that high-speed traveling cannot be performed.

Next, the case where the wheel crane A is moved while the operator cab 7 is moved to a position other than the traveling position will be described. In this state, the cab 7 is
Since the vehicle is moving upward, the view of the front left of the vehicle is obstructed by the telescopic boom 5 and the safety cannot be sufficiently confirmed, the traveling state is dangerous for traveling at high speed.

When the cab 7 is moved to a position other than the traveling position, the movement of the cab 7 is detected and the detection switch is turned on.
40a will be turned off. Upon receiving this signal, the traveling control means 28
Regardless of the shift signal output from the shift switch 33, the power shift transmission is transmitted to the hydraulic unit 29 that switches the shift speed of the power shift transmission 10.
A control signal for switching the ten speeds to the first speed or the reverse speed is output. As a result, the gear position of the power shift transmission 10 is changed even if the driver selects the shift switch 33 to the D range.
Since the gear is fixed to the low gear (first gear) and the high gear (second gear or third gear) is not selected, high-speed traveling using the high-speed gear mechanism is regulated, and safe traveling movement is achieved. It is possible.

In the case of the embodiment described above, three forward steps
When the driver's cab is moved to a position other than the traveling position using a power shift transmission having a single reverse speed, the shift to the second and third speeds is regulated as a shift to the higher speed. However, the present invention is not limited to the high-speed traveling restricting device, but may be applied to any transmission having at least two gears on the forward side. It is needless to say that the speed change mechanism of the high speed can be set to any speed other than the first speed.

Also, in the above-described embodiment, an example has been described in which the shift stage of the power shift transmission is selectively switched hydraulically by controlling the hydraulic unit with a control signal from the shift control means. The high-speed travel restricting device according to the present invention is not limited to the one in this embodiment.For example, in a transmission configured to mechanically switch gears, the driver's cab movement detecting unit detects that the driver's cab is in a position other than the traveling position. It is a matter of course that a mechanical lock means may be operated to detect a shift to a high-speed shift mechanism when the shift to the position is detected.

Further, in the case of the above-described embodiment, an example will be described in which the cab movement detecting means for detecting the moving state of the cab is constituted by a detection switch which comes into contact with the guide cylinder when the sliding cylinder is fully extended. However, it is needless to say that the operation of the fixing device 39 for fixing the cab in the traveling position may be detected.

[0026]

The high-speed traveling restricting device in the cab movable wheel crane of the present invention having the above-described structure is capable of shifting to a high-speed gear when the cab is moved to a position other than the traveling position. Since the driver's cab is restricted to not be able to perform the operation, the driver cannot move at high speed using the high-speed gear mechanism in the cab moving state other than the traveling position where the safety confirmation of the left front of the vehicle cannot be performed sufficiently. It has an excellent effect that safety at the time can be achieved.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a high-speed traveling restricting device in a cab movable wheel crane of the present invention.

FIG. 2 is an explanatory diagram of a schematic configuration of a cab movable wheel crane.

FIG. 3 is an explanatory diagram for explaining the visibility of the cab-movable wheel crane during traveling movement.

[Explanation of symbols]

A wheel crank 1,10 transmission (power shift transmission) 2 engine 4 traveling vehicle 5 turntable 7 cab 28 shift control means 40 cab position detection means

Claims (1)

(57) [Scope of request for utility model registration] 1. A transmission having at least a high-speed transmission mechanism and a low-speed transmission mechanism, wherein an output from an engine is shifted to a predetermined gear ratio by the transmission to drive driving wheels to travel. Between the traveling vehicle that has been moved, the revolving base that is mounted on the traveling vehicle so as to be capable of turning and driving, and a traveling position on the revolving platform that has moved forward with respect to the revolving platform and a crane working position that has moved rearward. A high-speed travel restricting device in a cab movable wheel crane having a cab movably mounted for both traveling and crane work, wherein a cab for detecting that the cab has moved to a traveling position. A shift detecting means, and a shift control means for selectively switching a shift mechanism of the transmission, wherein the shift control means includes a driver cab movement detecting means. When detecting that the vehicle has moved to the running position, the transmission is allowed to switch to a high-speed transmission mechanism of the transmission transmission mechanism, and otherwise, the transmission is switched to a high-speed transmission mechanism. A high-speed travel restricting device in a cab movable wheel crane, characterized in that: