JP4475760B2 - Operation lever device with switch for work vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an operation lever device mounted on a work vehicle such as a bulldozer or a hydraulic excavator, and more particularly to an operation lever device with a switch for controlling an actuator of a traveling system or a work machine system.
[0002]
[Prior art]
Conventionally, several proposals have been made regarding an operation lever device with a switch. For example, according to what is disclosed in Japanese Utility Model Laid-Open No. 6-70017, as shown in FIG. 8, the slit body 42 in the axial direction extending from the outer periphery to the inside is formed in the lever body 41 of the operating lever 40. The harness 44 connected to the switch 43 is inserted into the slit groove 42 from the outer peripheral side of the lever body 41, and taken out from the lower end of the slit groove 42 to the outside of the lever body 41.
[0003]
Further, for example, according to what is disclosed in Japanese Patent Laid-Open No. 7-26584, as shown in FIG. 9, a series of lever constituent members operated by gripping the knob 50 by an operator has two lever angle changing mechanisms. The hollow levers 53 and 54 and the inner cylinder 55 are separated from each other. A switch 56 is provided at the upper end of the knob 50, and the electric wire 57 passes through the inner cylinder 55 and the hollow portions of the levers 53, 54, and is pulled out to the outside by a fixing nut 58. It is pulled out more.
[0004]
[Problems to be solved by the invention]
However, in the technique disclosed in the above Japanese Utility Model Laid-Open No. 6-70017, when the operation direction of the operation lever 40 is a direction perpendicular to the side surface of the slit groove 42 of the lever body 41, the harness 44 has the slit groove 42. Due to repeated local restraint at the lower end of the plate, damage is likely to occur with excessive deformation, and there is a problem in durability.
[0005]
In the technique disclosed in Japanese Patent Application Laid-Open No. 7-26584, the electric wire is drawn out from the fixing nut 58 of the lever 53 at the lowermost end. Due to repeated local deformation, breakage tends to occur and there is a problem in durability.
[0006]
The present invention pays attention to the above-mentioned conventional problems, and even if the operation lever is repeatedly operated, the harness for the switch that goes out from the operation lever is not repeatedly subjected to local overload, thereby improving the durability of the harness. An object of the present invention is to provide an operation lever device with a switch of a work vehicle.
[0007]
[Means for solving the problem, operation, and effect]
In order to achieve the above object, according to a first aspect of the operation lever device with a switch of a work vehicle according to the present invention, a switch is provided on a knob of the operation lever, and a harness connected to the switch is provided inside the knob of the operation lever. In the operating lever device with a switch that can be swung back and forth and right and left around the operation swing center point , the operation lever is coupled to the upper knob body and the operation shaft that operates the lower operation valve. composed of a lower joint member, the lower joint member, the upper connecting portion having a through hole for the harness therein, and formed by joining a lower connecting portion away from the through hole, the through hole of the upper connecting portion When viewed from the center axis direction, the through hole center axis of the upper connecting portion is substantially directed to the operation swing center point of the operation lever .
[0008]
According to the first invention, since the lower connecting portion is joined to the upper connecting portion away from the central axis of the through hole for harness, the wiring direction of the harness passing through the through hole is not locally changed suddenly, It is possible to clamp on the vehicle body side through a sufficient three-dimensional space toward the operation swing center point of the operation lever, and even if the operation lever is operated repeatedly, the harness will not be locally forced and durable you improve. In addition, since the harness that has passed through the through hole is almost directed toward the operation swing center point of the operating lever, the harness that has passed through the through hole can be wired in the direction of minimal deformation when operating the operating lever. The durability is improved.
[0009]
According to a second aspect of the present invention, in the configuration of the first aspect , the harness connected to the switch has a predetermined length straight from the lower end portion of the through hole of the upper coupling portion to the operation swing center point of the operation lever. The wiring is provided and the harness clamp is provided on the vehicle body side.
[0010]
According to the second invention, the harness that has passed through the through-hole has a sufficient free length toward the operation swing center point of the operation lever, and is clamped to the vehicle body side through a sufficient three-dimensional space. In addition, since sudden changes such as local bending do not occur and swinging deformation can be dispersed and absorbed, it is not excessive and durability is improved.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of an operation lever device with a switch of a work vehicle according to the present invention will be described with reference to FIGS. First, the outline | summary of the operation lever apparatus with a switch in this embodiment is demonstrated with reference to FIG. FIG. 1 is a side sectional view of an operation lever device with a switch. In FIG. 1, the switch operating lever device has an upper operation lever 30 and a lower operation shaft portion 31. The operation lever 30 includes an upper knob body 20 and a lower lower joint member 10 which is a lower joint member. A harness 26 of a switch 25 provided on the top of the knob body 20 is connected to the lower joint member 10. When the operation lever 30 is taken out from the sleeve 11 in the direction of the operation swing center P, and the operation lever 30 is operated back and forth, and left and right, a sudden change such as local bending is not caused in the harness 26. .
[0012]
Next, the structure of the operation lever device with a switch in this embodiment will be described with reference to FIGS. FIG. 2 is a detailed view of a portion Q in FIG. In FIG. 1, an operation valve main body 3 is attached via a mounting plate 2 to a lower plate 1 b of a console provided on a side of an operator seat of a vehicle body (not shown). Four pressure reducing valves are provided inside the operation valve main body 3, and these pressure reducing valves project the push rod 4 from the upper surface of the operation valve main body 3. The upper ends of the push rods 4 of the four pressure reducing valves are in contact with a rotatable disk 6 by a universal joint 5 having a rotation center P. The disk 6 is fitted to an operation shaft 7 that is rotatably engaged with the universal joint 5. A boot 8 is provided between the side surface of the disk 6 and the upper surface of the operation valve body 3 to protect the upper mechanism of the operation valve body 3 from dust.
[0013]
The lower joining member 10 is separated from the upper connecting portion including the sleeve 11 and the sleeve nut 12 rotatably inserted into the sleeve 11 and the through hole 11a of the sleeve 11, that is, viewed in the central axis direction of the through hole 11a. The bar 13 has a bar 13 that extends downward by offset so that the bar 13 does not reach the hole of the through-hole 11a, and a lower connecting portion that joins the boss 14, and the bar 13 is joined to the cylindrical surface of the sleeve 11 as one body. Yes. The lower joining member 10 is fixed at the lower connecting portion by inserting the operation shaft 7 into the hole of the boss 14 via the spacer 9 and by a bolt 15. At this time, the orientation of the lower joining member 10 can be adjusted with respect to the central axis of the operation shaft 7. In a state where the boss 14 is fixed to the operation shaft 7, the extension line of the central axis of the through hole 11 a of the sleeve 11 of the lower joint member 10 is substantially the rotation center P of the universal joint 5 (the operation swing center of the operation lever 30). It is supposed to pass through.
[0014]
As shown in FIGS. 1 and 2, the knob body 20 is composed of a rod 21 having a through hole 21a in the center and a male screw portion 21b in the lower portion, and a knob 22. The rod 21 is knobd by an outer diameter portion 21c. The mold is fixed to 22 and integrated. In the upper connecting portion, the lower joint member 10 is configured such that the upper hole 23a of the boot 23 is inserted into the male screw portion 21b of the rod 21 of the knob body 20, the lower end portion 21d is brought into contact with the upper end portion of the sleeve 11, and the sleeve nut 12 It is tightened with. At this time, the orientation of the knob body 20 can be adjusted with respect to the central axis of the sleeve 11 of the lower joint member 10. The lower part 23b of the boot 23 is inserted and fixed on the upper plate 1a of the console, and protects the lower joining member 10 and the upper part of the valve body 3 from dust.
[0015]
A switch 25 is provided at the upper end of the knob 22, and the harness 26 passes through the hole 22 a of the knob 22, the through-hole 21 a of the rod 21, and the through-hole 11 a of the sleeve 11 toward the operation swing center P of the operation lever 30. Then, after a predetermined length S1 is secured from the lower end of the sleeve 11, it is pulled forward with a sufficiently large radius R1 and is fixed on the lower plate 1b of the console on the vehicle body side for fixing. It is clamped by a clamp 27.
[0016]
In addition, although the said lower joining member 10 has taken the structure which connects the sleeve 11 and the boss | hub 14 with the bar 13, as shown in FIG.3, 4, the sleeve 11 and the boss | hub 14A may be connected with the plate 13A or 13B. .
[0017]
Next, the operation and effect of this embodiment will be described with reference to FIGS. FIG. 5 is a Z view of FIG. As shown in FIG. 1, after the harness 26 is pulled out through the through hole 11a of the sleeve 11 toward the operation swing center P of the operation lever 30 and wired from the lower end of the sleeve 11 to a predetermined length S1, a sufficiently large radius R1 is obtained. Since the harness 26 protrudes straight from the through hole 11a of the sleeve 11 when the operation lever 30 is in the neutral state, the harness 26 is straightly pulled out toward the front of the vehicle body and clamped by the clamp 27 on the lower plate 1b of the console. As in the prior art, an excessively bent portion is not formed at the outlet portion.
[0018]
When the operation lever 30 is operated before and after, as shown by chain lines A and B in FIG. 1, the harness 26 that has passed through the through hole 11a is directed almost to the swing center P of the operation lever 30, so that the minimum deformation is kept. In addition, since the swinging deformation can be dispersed and absorbed, a sudden change such as local bending does not occur in the harness 26, and an excessive force is not applied. When the operation lever 30 is operated to the left and right, the harness 26 is hardly deformed as shown by chain lines C and D in FIG.
[0019]
Further, since the knob main body 20 and the lower joint member 10 are coupled by the sleeve 11 and the sleeve nut 12, it is not necessary to turn the knob main body 20 during assembly, so that the harness 26 is not twisted and damaged. Further, the orientation of the lower joint member 10 can be adjusted with respect to the central axis of the operation shaft 7, and the orientation of the knob body 20 can be adjusted with respect to the central axis of the sleeve 11 of the lower joint member 10. Manufacturing and assembly errors can be adjusted, and the optimal knob position can be set according to the operator or working conditions.
[0020]
Next, the case where the harness 26 is pulled out toward the rear of the vehicle body will be described with reference to FIGS. FIG. 6 is a wiring side view in which the harness is taken out rearward, and FIG. 7 is a Y view of FIG. 6 and 7, the harness 26 </ b> A is drawn outwardly through the through hole 11 a of the sleeve 11 toward the operation swing center P of the operation lever 30, and a predetermined length S <b> 2 is secured from the lower end of the sleeve 11. Then, it is pulled out to the lower left with a large radius R2, and further pulled out rearward of the vehicle body with a sufficiently large radius R3, and is clamped by a clamp 27 on the lower plate 1b of the console. As shown in FIG. 6, when the operation lever 30 is in a neutral state, the harness 26A is straight out of the through hole 11a of the sleeve 11, so that an unreasonable bent portion is formed at the exit portion as in the prior art. There is no. The predetermined lengths S1 and S2 are appropriately about 10 mm to 50 mm in a construction machine such as a bulldozer.
[0021]
When the operation lever 30 is operated before and after, as shown by chain lines E and F in FIG. 6, the harness 26 </ b> A that has passed through the through hole 11 a is almost directed to the operation swing center P of the operation lever 30. In addition, since the swinging deformation can be dispersed and absorbed, a sudden change such as local bending does not occur in the harness 26A, and an excessive force is not applied. When the operation lever 30 is operated to the left and right, as shown by chain lines G and H in FIG. 7, the harness 26A is hardly deformed and no local bending occurs at all.
[0022]
As described above, according to the operation lever device with a switch of the work vehicle according to the present invention, the lower connecting portion is joined to the upper connecting portion of the lower joining member away from the central axis of the through hole for the harness. It is possible to clamp on the vehicle body side through a sufficient three-dimensional space toward the operation swing center of the operation lever without locally changing the wiring direction of the harness passing through the through hole. Even if operated, the harness is not forced locally and durability is improved. In addition, since the central axis direction of the through hole of the upper connecting portion of the lower joint member is substantially directed to the operation swing center of the operation lever, the harness that has passed through the through hole is also directed substantially to the operation swing center of the operation lever. Therefore, when operating the operating lever, the harness that has passed through the through hole can be wired in a direction that keeps it to the minimum deformation, so that the harness is not locally forced and durability is improved.
[0023]
In addition, since the harness is wired for a predetermined length from the lower end portion of the through hole of the upper connecting portion of the lower joint member toward the operation swing center of the operation lever, the harness clamp is provided on the vehicle body side. The harness that has passed through the through hole has a sufficient free length toward the center of the operation lever of the operation lever, and is clamped to the vehicle body side through a sufficient three-dimensional space. Since sudden change does not occur and swinging deformation can be dispersed and absorbed, it is not unreasonable and durability is improved.
[Brief description of the drawings]
FIG. 1 is a side sectional view of an operation lever device with a switch of a work vehicle according to the present invention.
FIG. 2 is a detailed view of a Q part in FIG. 1;
FIG. 3 is a view showing another structural example of the lower bonding member.
FIG. 4 is a view showing another structural example of the lower bonding member.
FIG. 5 is a Z view of FIG. 1;
FIG. 6 is a side view of a wiring in which a harness is taken out rearward.
7 is a Y view of FIG. 6. FIG.
FIG. 8 is a view showing an example of a conventional switch operating lever device.
FIG. 9 is a view showing another example of a conventional operating lever device with a switch.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1a ... Upper plate, 1b ... Lower plate, 2 ... Mounting plate, 3 ... Operation valve main body, 4 ... Push rod, 5 ... Universal joint, 6 ... Disk, 7 ... Operation shaft, 8 ... Boot, 10 ... Lower joining member, DESCRIPTION OF SYMBOLS 11 ... Sleeve, 11a ... Through-hole, 12 ... Sleeve nut, 13 ... Bar, 13A, 13B ... Plate, 14, 14A ... Boss, 15 ... Bolt, 20 ... Knob body, 21 ... Rod, 22 ... Knob, 23 ... Boot , 25 ... switch, 26, 26A ... harness, 27 ... clamp, 30 ... operation lever.

Claims (2)

A switch is provided on the knob of the operating lever, and the harness connected to the switch is passed through the knob of the operating lever, with a switch that can swing back and forth and left and right around the operation swing center point (P) In the operation lever device, the operation lever (30) is composed of an upper knob body (20) and a lower joint member (10) coupled to an operation shaft (7) for operating the lower operation valve. The member (10) is configured by joining the upper connecting portion having a through hole (11a) for the harness (26, 26A) therein and joining the lower connecting portion apart from the through hole (11a) , The central axis of the through hole (11a) of the upper connecting portion is substantially directed to the operation swing center point (P) of the operation lever (30) when viewed from the central axis direction of the through hole (11a) of the upper portion. An operation lever device with a switch of a work vehicle. The operation lever device with a switch for a work vehicle according to claim 1 , wherein the harness (26, 26A) connected to the switch is substantially operated from the lower end portion of the through hole (11a) of the upper coupling portion. towards the operating swing center point, straight a predetermined length (S1, S2) and wiring harness (26, 26A) with switch lever apparatus for a working vehicle, characterized in that provided on the vehicle body side clamps.

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