JPH0369730A - Step device in super-miniature shovel car - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a step device in a micro-compact excavator car, and more particularly to a step device in an elevating-type micro-compact excavator car.

[Prior Art 1] Conventionally, there has been no ultra-compact excavator car that can perform excavation work in narrow spaces. When manufacturing this type of ultra-compact excavator car, in order to make the car body smaller, there was no driver's seat, and workers stood behind the car body and excavated while operating the work boom and packet. It is conceivable that the excavation work or the forward and backward movement of the vehicle body may be carried out by riding on a step provided at the rear of the vehicle body.

[Problems to be Solved by the Invention] In the above-mentioned ultra-compact excavator car, the operator performs digging and driving operations while standing on the steps at the rear of the vehicle, but there are times when the operator performs the above operations while standing at the rear of the vehicle. When doing so, the step must be moved upwards so that it does not interfere with the work. In such a case, it is necessary to raise the step and step arm as high as possible to ensure sufficient ground clearance.

Also, by providing a step at the rear of the vehicle body, it becomes difficult to remove soil from the rear.1. Each time, the vehicle must be turned back and forth to level the soil, which can make the soil removal process complicated.

Therefore, a technical problem arises that must be solved in order to increase the upward stroke of the step and the step arm and to efficiently remove soil from the rear, and the present invention aims to solve this problem. purpose.

[Means for Solving the Problems] This invention was proposed to achieve the above object, and includes a work boom that is attached to the front part of the vehicle body, and the boom is moved by expanding and contracting a boom cylinder and a swing cylinder. In a small work vehicle with an engine and a transmission case installed at the rear of the vehicle body, the lower center of the transmission case is recessed in the front and back direction, and the front part of this recess is recessed. Pivotally connect the front end of the step arm,
An ultra-compact excavator car characterized in that a step is provided at the rear end of the step arm, the step arm is formed to be able to rise and fall freely, and the step arm is formed so that it can be stored in the recessed portion when the step arm is raised. The present invention aims to provide a step device for an ultra-small excavator car, and a step device for an ultra-small excavator car, in which an earth removal plate is detachably provided at the rear end of the step.

[Function 1] In the present invention, a transmission case is provided at the rear of the vehicle body of an excavator car, and the center portion of the lower surface of the transmission case is recessed in the front-rear direction. Further, a step arm is provided at the rear of the vehicle body so as to be movable up and down, and the front end of the step arm is pivotally attached to the front of the recessed portion. Then, when the step arm is rotated upward, it is housed in the recessed portion. Therefore, when the step is not in use, the step arm can be raised as much as possible, and sufficient ground clearance for the step arm portion can be ensured.

Further, a soil evacuation plate can be attached to the rear end of the step arm, and when the step arm is lowered with the soil evacuation plate attached, the evacuation plate comes into contact with the ground. In this state, the vehicle body can be moved forward or backward to level the ground using the earth removal plate. Moreover, since the earth removal plate is removable, it can be easily removed when not in use.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings. Figures 1 and 2 show an ultra-compact excavator car, in which a work boom attachment part (2) is provided at the front of the frame (1), and an engine (3) is provided at the rear of the frame (1). ) are listed. A swing bracket (4) is attached to the mounting part (2), and the boom (
The base (5a) of 5) is pivotally mounted. An arm bracket (6) is provided protruding from the negative side of the swing bracket (4), and the tip of the swing cylinder (7) provided on the positive side of the frame 0) is pivotally attached to the arm bracket (6). The boom (5) swings left and right due to the telescoping operation of the swing cylinder (7). 8), the boom (
5) rotates up and down about the base (50).The tip (5C) of the boom (5) has one end (5C) of the arm (9).
90 is pivotally mounted and rotated up and down by an arm cylinder (10) provided between the intermediate portion (5b) of the boom and one end portion 00 of the arm. Furthermore, the packet 01) is pivotally attached to the tip end (9b) of the arm, and the packet 01) is configured to be rotated by the packet cylinder 0.

A transmission case 0→ is fixedly installed at the bottom of the engine (3), and a drive shaft (17
0 protrudes, and drive sprockets (LC
9 (+5i) is provided. Passive wheels (119 (lf9) are pivotally mounted on the left and right sides of the lower front side of the frame (1), respectively, and a crawler @<rt is wound between the drive sprockets (1'1) (1'9).

In addition, there is a passive wheel (IF) (119 between
A seagull (1'j) is pivotally mounted and moved up and down by an extraction cylinder (1). In addition, a step arm (21) is provided rearward from the bottom of the mission case (1→), and the step arm QO
Pivotally attach the step @ to the rear end of the

As shown in FIG. 3, an input shaft is pivoted in the front-rear direction at the center of the mission case (1).

Intermediate shafts (2) and (c) are respectively pivotally installed on the left and right sides of the input shaft () in parallel with the input shaft (), and the rotation of the input shaft (2) is once shifted by the sub-transmission gear (). Afterwards, it is transmitted from the input shaft (directly or via a counter gear) to the intermediate shaft (b). Then, the worm wheels "h" provided at the ends of the intermediate shafts (B) and (B) are engaged with the worm wheels (4) and (A) fitted to the inner ends of the left and right drive shafts 04)H, The rotation of the left and right intermediate shafts (B) (B) is transmitted to the respective drive shafts (YU).

Since power is transmitted by the combination of the worm (c) and the worm wheel (4), a space is created between the left and right worm wheels (1) and (2), and the transmission case (1)
→ A recessed part (to) is provided in the center of the bottom surface.

Here, step arm (2
1) and step @ will be explained in more detail. Bearing parts (1) and 01) are provided at the front end and rear end of the step arm QO, respectively, and a support plate (to) (cut) is provided upright on the upper surface of the rear end.This support plate (2) (to) the front end of the hole @(
A curved guide plate 0> is fixedly installed on the rear upper surface of the support plate (B) (2).

On the other hand, on the black side of Step @, place the reinforcing plate (to) at the appropriate position (
(to)...- are fixed, and a notch (1) is bored in the front central part of the step (to), and an opening (b) is made in the rear central part. Then, attach the locking rod (
A) is arranged so as to be slidable back and forth, and by grasping the handle (B) of the locking rod (B) provided in the opening (B) and moving it back and forth, the locking rod (1) can be moved back and forth. The front end (38) is formed to fit into or leave the hole (400 or (40b) of the guide plate (B).Furthermore, on the left and right sides of the step @ front end, the step arm 01) is formed. End bearing part 0
Bearings (41) (41) are provided to engage with both ends of 1), and a pin (P) is pushed through the bearings (41) (41) and 01).

Thus, the bearing portion (31) of the step arm (21)
) is rotatably pivoted to the step @, and the front end (380) of the locking rod (1) is connected to the hole (401) of the guide plate (b) or (
40b), the step @ is fixed.

Further, a discharge plate (42) may be provided at the rear end of the step. The earth removal plate (42) is detachably attached to the step @ by lock pins (43), and can be removed when not in use.

As shown in FIGS. 1 to 3, a bracket (44) is fixed to the front part of the concave part (to) of the transmission case (1), and the step arm (44) is attached to the bracket (44). 21) Pivotally attach the bearing part (1) at the front end. Also, connect the lower end of the auxiliary cylinder (45) to the hole (to) of the support plate (b), and connect the upper end of the hydraulic cylinder (45) to the mission case (1→bracket (46) protruding from the rear). Therefore, when the hydraulic cylinder (45) is extended, the step arm (21) rotates downward and the step @ is lowered, and when the At+ pressure cylinder (45) is contracted, the step arm (21) rotates upward and the step @ rises.

Then, as mentioned above, the exhaust plate (
42), lower the step @ and remove the soil removal plate (4).
By moving the vehicle body forward or backward while contacting the soil plate (2) with the ground, leveling work of the ground can be performed using the earth removal plate (42). On the other hand, when the step @ rises, the step arm (2
1) is accommodated, and sufficient ground clearance for the step arm QO portion can be ensured. In addition, the worker can work by standing on the step@ as desired, and since the step@ is foldable, the step@ can be easily folded when not in use.
If you flip it upwards and fix it, it will not interfere with work at the rear of the vehicle.

Furthermore, the steps behind the crawler (r7) (r7) @
Attach the lower end of the protective cover (47) (4?) to the front end, and attach the mounting bracket (48) fixed to the mission case (4).
(4B) Attach the upper end of the protective cover (47) (4?) via the springs (49) (49). By providing the protective cover (47), the crawler (RF)
It is possible to prevent pebbles, sand, etc. thrown up by the machine from scattering backwards, improving safety for workers. Moreover, the protective cover (47) is biased upward by the tensile force of the spring (49), and can protect the scattering of pebbles etc. regardless of the lifting and lowering operation of the step @.
There is no risk that the protective cover (47) will be caught in the gap between the vehicle body and the vehicle body. The protective cover (47) may be made of an elastic member such as rubber, and in such a case, a spring (49) may be used.
), the protective cover (47) is constantly pulled upward, so that it does not loosen.

Note that this invention can be modified in various ways without departing from the spirit of the invention, and it goes without saying that this invention extends to such modifications.

[Effects of the Invention] According to the present invention, by forming the step arm so that it can be stored in the recess provided on the lower surface of the transmission case, sufficient ground clearance can be ensured when the step is raised. Therefore, the risk of the lower part of the vehicle body colliding with an obstacle is reduced even when working on a rough road with severe unevenness. Moreover, the mechanical strength of the transmission case is increased by the recessed portion, and it becomes possible to form an excavator car having a compact and sturdy body structure. By attaching a soil removal plate to the rear end of the step, it is possible to level the ground, and since the soil removal plate is removable, it can be removed extremely easily when not in use. This is an invention that brings about various effects, such as the ability to

[Brief explanation of drawings]

The figures show one embodiment of the present invention, in which Fig. 1 is a partially cutaway side view of an ultra-compact excavator, Fig. 2 is a rear view of the same, Fig. 3 is a partially cutaway vertical rear view of the transmission case, and Fig. 4 is a partially cutaway side view of the ultra-compact excavator. The figure is a plan view of the main part of the step device, and FIG. 5 is a sectional view taken along the line A--A in FIG. 4. (1)...Frame (2)...
・Mounting part (3)...Engine (5)・
Old...Boom (1→...Mission case (21)...Step arm)...
・Step (to)・・・Concave part (42
)−・・・・Discharge plate patent, patent applicant Iseki Agricultural Machinery Co., Ltd.

Claims (2)

[Claims] (1) For small-scale work, with a working boom attached to the front of the vehicle body, the boom can be rotated vertically and horizontally by expanding and contracting the boom cylinder and swing cylinder, and the engine and transmission case are installed at the rear of the vehicle body. In a vehicle, the central part of the lower surface of the transmission case is recessed in the front-rear direction, the front end of a step arm is pivotally connected to the front part of this recess, a step is provided at the rear end of the step arm, and a step is provided at the rear end of the step arm. 1. A step device for an ultra-small excavator car, characterized in that the arm is formed to be able to rise and fall freely, and the step arm is formed so that it can be stored in the recessed portion when the step arm is raised. (2) A step device for an ultra-compact excavator car according to claim (1), wherein a soil removal plate is detachably provided at the rear end of the step.