JPH0516295Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a ski device that is attached to the back of a blade of a work vehicle such as a bulldozer or a snow removal vehicle.

(Prior Art) As shown in Japanese Patent Publication No. 61-58616, there is a ski device for keeping the excavation depth of a blade of a working vehicle constant.

This ski device, as shown in Fig. 3,
Bracket 11 installed on the back of blade 10
The base end of a swing arm 13 is rotatably attached by a swing shaft 12, and a slider 15 is mounted inside a cylinder 14 at the tip end of the swing arm 13, as shown in FIGS. 4 and 5. The ski 1 is provided movably but not rotatably by a key 16, and is in contact with the road surface by a pin 17 at the lower end of the slider 15, as shown in FIG.
8 are connected to each other, and a screw 20 that is rotated by a handle 19 is screwed onto the upper part of the slider 15. In Figures 4 and 5,
21 is a vertical groove into which the key 16 is fitted, and 22 is a female thread into which the screw 20 is screwed.

Then, by turning the screw 20 using the handle 19, the slider 15 is moved up and down, and the height of the ski 18 is adjusted. After this height adjustment is completed, as shown in FIG. 3, the handle 19 is folded down into the locking device 24 around the mounting bolt 23 to prevent the screw 20 from rotating.

The ski 18 has a swing shaft 12 attached to the back of the blade via a bracket 11.
Swing around. This swing angle is automatically set to an angle equivalent to the angle so that even if the blade 10 is angled, the ski 18 faces in the straight direction of the vehicle. In other words, no matter what the angle of the blade 10 is, the swing arm 13 swings the ski 18 so that it always faces in the straight direction of the work vehicle.

(Problem that the invention aims to solve) The blades installed on work vehicles include angle type and angle & side slide type, but for these blades, it is necessary to increase the angle of the blades in order to improve work efficiency. Alternatively, there are many requests from users for an increase in the amount of side slide.

However, in the structure of a conventional ski device, the height adjustment mechanism for the ski 18 (cylinder 14, slider 15, handle 19, screw 20) is located at the tip of the swing arm 13, and the height adjustment mechanism is located directly above the ski 18. Because of the protruding shape, as the angle angle increases or the amount of side slide increases as mentioned above, the height adjustment mechanism located directly above the ski becomes an obstacle, and the height adjustment mechanism becomes an obstacle to the parts on the vehicle body side. There was a problem of interference, and it was difficult to satisfy user demands.

In addition, in manufacturing, the height adjustment mechanism was
As shown in the drawings and FIG. 5, since it has a triple structure consisting of a cylinder 14, a slider 15, and a screw 20, a large amount of machining is required to maintain proper clearance between each member.

Furthermore, in terms of strength, each member of the height adjustment mechanism has sufficient strength, but if an excessive impact is applied, the slider 15 may become curved, making it impossible to adjust the vertical movement, or preventing the slider 15 from rotating. key 1
Screw 2 due to falling off of screw 6, and missing handle mounting bolt 23 at the head of screw 20.
0, there is a risk that problems such as the slider 15 and skis 18 falling off may occur.

The purpose of this invention is to solve each of these problems, and as shown in Figure 1, no matter what kind of blade the ski device is attached to, interference with the components on the vehicle body side can be prevented. The purpose is to ensure clearance, facilitate manufacturing, and improve the resistance against excessive impact over time.

[Effect of idea]

(Means for Solving the Problems) The present invention provides a ski device that is height-adjustably mounted on the back of a blade 10 of a work vehicle, in which a slide guide 3 is attached to the back of the blade 10 in a vertical direction.
2, a slide bracket 41 is fitted to the slide guide 32 so as to be vertically movable, and an upper part of a swing arm 44 is rotatably fitted to the slide bracket 41 via a vertical swing shaft 43. A ski 52 is pivotally supported at the bottom of the swing arm 44 , and a height adjustment mechanism 61 is provided above the swing shaft 43 near the back of the blade. pin 63
The slider 64 connected with
This is a ski device in which a rotating operation part 74 is provided on the eastern part of the ski.

(Function) In the present invention, when the screw 66 is rotated, the slider 64 that is threaded with the screw 66 is moved up and down, and the slide bracket 41 connected to the slider 64 with a pin 63 is moved to the slide guide 32.
The height of the ski 52 is adjusted via the swing arm 44. The swing arm 44 is the swing shaft 4
3, and the skis 52 follow the vehicle so that they are always parallel to the straight direction of the vehicle. The height adjustment mechanism 61 is located near the back of the blade, and the swing arm 44 protrudes from the slide bracket 41 provided at the bottom of the height adjustment mechanism 61 in the opposite direction to the direction in which the vehicle is traveling straight. There is no height adjustment mechanism 61 directly above the skis 52, so there is no risk that this height adjustment mechanism 61 will interfere with any member on the vehicle body side. In addition, the sliding structure of the slide guide 32 and the slide bracket 41, the slider 64 and the screw 66
The slide bracket 41 is separated from the screw structure of the slide bracket 41.
Since the slider 64 and the slider 64 are connected by the pin 63, it is only necessary to sequentially consider the relationship between the two members in manufacturing.
Furthermore, due to the fitting structure between the slide guide 32 and the slide bracket 41, all external loads applied to the skis 52 in all directions are transmitted as vertical forces to the height adjustment mechanism 61. There is no need to consider bending strength.

(Example) Hereinafter, the ski device of the present invention will be explained as shown in Figures 1 and 2.
This will be described in detail with reference to the embodiments shown in the figures.

In angle dozers, side-sliding angle dozers, etc., members such as supports and swing supports for holding the blade 10 on the vehicle body are connected to the back of the blade, so the ski device is attached to these members or the front wheels of the vehicle. It is preferable to install it on the back side of the blade 10 so as not to interfere with it.

Taking these points into consideration, a base plate 31 is attached to an appropriate location on the back of the blade 10 by welding or the like, and a slide guide 32 is provided at the bottom of the base plate 31, which faces in the shape of [ ] when viewed from above. ing. This slide guide 32 has tapping plates 33 fixed to the left and right sides of a base plate 31, and a guide plate 35 fixed to the tapping plates 33 via shims 34 with bolts 36. A pair of formed U-shaped grooves are opposed to each other. The shim 34 is provided as an adjusting means for obtaining a proper clearance between the base plate 31 and the guide plate 35.

A slide bracket 41 is fitted between a pair of U-shaped grooves in the slide guide 32 so as to be vertically movable. A pair of shaft supports 42 are provided at the upper and lower portions of this slide bracket 41, and a swing shaft (pin) 43 is provided between the pair of shaft supports 42.
The upper part of the swing arm 44 is rotatably attached. This swing arm 44 is
It can swing until it is stopped by a pair of left and right stoppers 45 provided between the upper and lower shaft supports 42.

The swing arm 44 is manufactured by melt-cutting a thick plate, and is not manufactured in a specific shape to avoid interference with various dozer devices, but the swing arm 44 shown in the figure is not limited to a specific shape.
is protruded diagonally downward from the upper part into which the swing shaft 43 is inserted, and a shaft support 53 of the ski 52 is attached to the lower part of the swing arm 44 by means of a pin 51.
is installed. This ski 52 is pin 51
The ski 52 can be rotated about the fulcrum, and the ski 52 is attached to the front and rear locking surfaces 54 formed on the lower surface of the swing arm 44.
The skis 52 are swung back and forth until the upper surfaces of the skis 52 are in contact with each other, allowing the skis 52 to follow changes in the road surface. A bottom plate 55 is attached to the lower surface of the ski 52 with bolts 56.

Even if the angle angle or side slide amount of the blade 10 changes, as the vehicle moves forward, the swing arm 44 swings around the swing shaft 43 at the front end and swings the ski 5.
2 is always kept in the straight forward direction of the work vehicle.

The height adjustment mechanism 61 for vertically moving the slide bracket 41 has a lower part of a slider 64 connected by a pin 63 between a pair of shaft supports 62 projecting upward from the slide bracket 41, and a lower part of the slider 64 connected to the upper part of the slider 64. A screw 66 is screwed into the formed female thread 65, and a flange 67 provided integrally with the screw 66 is rotatably held by a holder 68. This holder 68
The screw mounting plate 68 is fixed to the base plate 31 using reinforcing gussets 69.
a and a presser plate 68c fixed to the upper side thereof with bolts 68b.

The slider 64 is a square piece that has been threaded to screw the screw 66, and this square slider 64 is attached to the base plate 31.
The reinforcing gusset 69, which is an integral part of the
The rotation of the slider 64 is reliably restrained, and as the screw 66 rotates, the slider 64 is guided by the vertical gusset 69 and moves up and down smoothly. Note that since the rotation of the slider 64 is also restrained by the pin 63, the gusset 69
is not indispensable.

A handle mounting block 71 is fitted into the head of the screw 66, and a bolt 72 is inserted into a horizontal hole bored in the screw 66, and the handle mounting block 71 is fixed by the bolt 72 and nut 73. A handle 74 serving as a square-shaped rotation operating section is slidably inserted into the handle insertion hole at the top of the handle mounting block 71. A handle locking mechanism 75 for preventing rotation is provided for the handle 74.

This handle lock mechanism 75
It consists of a bent end 76 bent at right angles at both ends of the blade, and a pair of leaf springs 78 screwed to the base plate 31 on the back of the blade via a mounting part 77. When the blade 10 is tilted down as shown in FIG.
8 to prevent it from flying up. As a result, the tip of the bent end 76 of the handle 74 and the back surface of the blade 10 are opposed to each other with a slight gap therebetween, so that engagement between the two prevents the handle 74 from turning (self-locking), and the screw 66 is prevented from turning. Rotation is prevented and the height of the ski 52 remains constant.

Next, when adjusting the height of the ski 52, turn the bent end 76 of the handle 74 upward to remove it from between the leaf springs 78, and then turn the handle 74. At this time, the handle 74 is pulled out to the opposite side every time it is turned 180 degrees. This is because the distance from the back of the blade 10 to the center of rotation of the handle 74 is short, and a fixed handle cannot be rotated 360 degrees. Rotate it 180 degrees, then pull it out to the other side and rotate it 180 degrees. Although such an operation takes some time, since the range in which the handle 74 can be turned naturally is restricted, it is self-locking.

When the screw 66 is rotated by the handle 74, the slider 64 that is threaded with the screw 66 is moved in the vertical direction, and the pin 66 is moved vertically.
Slide bracket 4 connected by 3
1. The swing arm 44 and the ski 52 are vertically adjusted as one unit.

External loads act on the skis 52 not only in the vertical direction but also in the longitudinal and horizontal directions;
This external load is received by each surface of the U-shaped groove of the slide guide 32 that contacts the slide bracket 41 via the swing arm 44,
Only vertical loads act on the slider 64 and screw 66 of the height adjustment mechanism 61. In this way, since no load in the bending direction acts on the slider 64 and the screw 66, it is only necessary to consider the proof stress due to buckling, and there is no need to consider the bending strength. Therefore, the height adjustment mechanism 61 can be set to have a much slimmer shape than conventional ones. In other words, the slide bracket 41 supports the external load applied to the ski 52, and transmits the vertical component force and vertical load to the height adjustment mechanism 61, so these structures are better than conventional ones. It is advantageous in terms of strength. Note that even if the swing arm 44 is slightly deformed due to overload, the functionality of the ski device will not be impaired.

Further, since the flange portion 67 of the screw 66 is held from below by the plate 68a integrated with the blade 10, there is no risk of the screw 66 etc. falling off unless the flange portion 67 is damaged.

Next, the ski device of the present invention is applied to the blades of bulldozers, snow removal vehicles, coal dozers (a type of bulldozer and a working vehicle specially manufactured for pushing coal in coal yards of thermal power plants, etc.). . The ski device of the present invention can be used when the angle angle and side slide amount of the blade are set large in the case of an angular blade or a side sliding type blade (for example, an angle angle of 35°,
Although the necessary clearance can be secured between the ski device and the vehicle body side member even if the side slide amount is set to 500 mm on one side, the ski device of the present invention is limited to this angular blade or side sliding type blade. Needless to say, the present invention also includes a ski device that is not limited to a conventional fixed blade.

[Effect of idea]

According to the present invention, since the height adjustment mechanism does not protrude directly above the ski, it is possible to reliably prevent interference between the height adjustment mechanism and components on the vehicle body side, and improve the blade angle and side slide amount. Even if it is set large, the necessary clearance can be secured between it and the vehicle body. In addition, since the fitting structure of the slide guide and slide bracket and the screwing structure of the slider and screw are provided separately, it is easier to manufacture than the conventional structure in which these are manufactured in one piece. Since the external load is provided by the mating part and the lateral load is not applied to the threaded part, even if an external force that deforms the swing arm is applied to the ski, the function of the ski device will not be impaired. There are also advantages in strength that are not lost. Furthermore, since the screw is rotatably held by the holder, it is possible to prevent the ski device from falling off from the blade due to a bolt breaking as in the conventional case.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view showing an embodiment of the ski device of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a side view of a conventional ski device, and Fig. 4 is its height adjustment. A cross-sectional view of the mechanism, FIG. 5 is a cross-sectional view taken along the - line in FIG. 4. 10...Blade, 32...Slide guide,
41...Slide bracket, 43...Swing shaft, 44...Swing arm, 52...Ski, 61...Height adjustment mechanism, 63...Pin, 6
4...Slider, 66...Screw, 68...
Holder, 74...Handle as a rotating operation part.

Claims (1)

[Scope of utility model registration request] In a ski device that is height-adjustably mounted on the back of a blade of a work vehicle, a slide guide is provided in the vertical direction on the back of the blade, and a slide bracket is fitted to this slide guide so as to be vertically movable. The upper part of the swing arm is rotatably fitted to the upper part of the swing arm via a vertical swing shaft, a ski is pivotally supported at the lower part of this swing arm, and a height adjustment member is located near the back of the blade on the upper side of the swing shaft. A mechanism is provided, and this height adjustment mechanism has a slider connected to the slide bracket with a pin and a screw rotatably held by a holder attached to the back of the blade. A ski device for blades of a work vehicle, characterized in that a rotation operation part is provided on the head.