JPH09209406A - Suspension sheet structure for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an inexpensive, simple and convenient suspension sheet, by supporting the front part of the sheet by an elastic member which is laterally rigid and has less vertically elastic deformation and supporting the rear part of the sheet by an elastic member which is lateraly rigid and has much vertically elastic deformation. SOLUTION: The suspension 2 of a sheet 1 is provided with a rubber spring system 3 supporting the front part of the sheet 1 and a coil damper unit system 4 supporting the rear part of the sheet 1. The rear part of the sheet is supported in a large stroke and the front part of the sheet is supported in a small stroke. The vibration in the side part of the sheet is restricted by the lateral rigidity of the rubber spring system 3 and the lateral rigidity of the coil damper unit system 4 and the vibration in the front and rear direction is restricted by the lateral rigidity of the rubber spring system 3. A pair of right and left rubber spring systems and coil damper systems are provided, they are fitted vertically when viewed from the side and also they are fitted in a nearly inverted V-shaped form when viewed from the front.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat structure provided with a suspension mechanism for reducing a shock transmitted to a seat on which an operator is seated in a construction machine such as a hydraulic excavator, and more particularly to a rubber spring as a suspension mechanism. The present invention relates to a structure using a coil damper unit.

[0002]

2. Description of the Related Art The background of the present invention will be described by taking a hydraulic excavator as an example of a construction machine. Hydraulic excavator 30
Generally, as shown in FIGS. 3 and 4, a front attachment 31, a lower traveling body 32 including a crawler, and an upper swing body 33 are provided. Here, the upper swing body 33
Includes a swing frame 35 and has a function of rotating 360 ° via a bearing device. Further, the lower traveling body 32 has traveling functions of forward and backward movement, spin turns, and pivot turns. A cab 34 on which an operator rides is provided as a main component of the hydraulic excavator 30. The cab 34 is provided on the swing frame 35 of the upper swing body 33. As shown in FIG. 5, the periphery of the cab 34 includes a swing frame 35, a cab floor 39 that rides on the swing frame 35,
And a cab 34 that rides on the cab floor 39. The swing frame 35 includes the support bracket 3
A cab support 37 having 6 is provided. Further, the cab floor 39 has a mounting hole 38 coaxial with the support bracket 36 in the illustrated example. The cab floor 39
Are mounted on the cab support 37.
The mounting state of the swing frame 35, the cab floor 39, and the cab 34 is shown in FIG.
A side view from the side is shown in FIG.

FIG. 8 shows an example of the cab mounting structure of the Y portion in the figure, which is one corner of FIG. 6, in detail. The cab attachment structure in this case is as described above.
It has a cab 34, a cab floor 39 to which the cab 34 is attached, and a swing frame 35 to which the cab floor 39 is attached. Cab floor 3
The mounting portion of the cab 34 with respect to 9 is via a boss 40 welded to the cab floor 39 and threaded on the inner surface in the illustrated example, and a rib 41 and a washer 42 protruding from the cab 34 to the boss 40 in the illustrated example. It has a bolt 43 for tightening it. Further, the mounting portion of the cab floor 39 to the swing frame 35 is a boss 44 welded to the cap floor 39 in the illustrated example.
And the swing frame 3 by the pair of upper and lower caps 45.
Mount rubber 4 sandwiched above and below 5
6 and a collar 47 provided at the center of the mount rubber 46
And a washer 48 provided on the outer surface of the cap 45,
The boss 44, the cap 45, the mount rubber 46, and the washer 48 are integrally provided with a bolt 49 and a nut 50 that connect the cab floor 39 and the swing frame 35. The reference numeral 51 indicates a weather strip 51 inserted between the cap 34 and the swing frame 35.
Shows a rubber referred to as. Reference numeral 63 is a cylindrical rubber inserted between the collar 47 and the cab floor 39. Here, as shown in FIG. 9, for example, the cab 34 has a trapezoidal seat support 52 bolted up to the center of the cab floor, and a seat mounted on the seat support 52 via a suspension 53. And 54. An operator sits on the seat 54. The operator station
As shown in FIG. 10, it has an operation lever 55 and a seat 54.

In FIGS. 9 and 11, reference numeral 56 is a back of the seat 54, 57 is a headrest, 58 is an armrest, and 59 is a recliner. Z of this FIG.
The part is the suspension 53, and the suspension 5
3 is shown in detail in FIG. This FIG. 12 (a)
As a conventional example of the suspension 53, (b) shows one having a parallel link mechanism 60 and an X link mechanism 61, respectively. The conventional suspension 53 includes a parallel link mechanism 60 or an X link mechanism 61, and a spring 62 or a damper (not shown) between the upper portion of the seat 54 and the seat support 52. Parallel link mechanism 6
The 0 or X link mechanism 61 is for movably attaching the seat 54 to the seat support 52 up and down. Further, the spring 62 or the damper is provided to support the seat 54 and reduce the vibration in the vertical direction. However, according to the link mechanisms 60 and 61,
There is a problem that backlash occurs, and there is a problem that the cost is increased because the mechanism / structure becomes complicated. Therefore, it is not used in small mini excavators.

[0005]

SUMMARY OF THE INVENTION A main object of the present invention is to provide a suspension seat structure which is inexpensive and simple and can be applied to a small construction machine.

[0006]

In order to solve the above-mentioned problems, the invention of claim 1 provides a suspension seat structure for a construction machine, comprising a seat supported through a suspension, wherein the suspension is The technical feature is that a front portion of a seat is supported by an elastic member having lateral rigidity and a small amount of vertical elastic deformation, and a rear portion of the seat is supported by an elastic member having lateral rigidity and having a large vertical elastic deformation. I am taking steps. In the invention of claim 2,
The technical measure is taken that the suspension consists of a rubber spring system supporting the front part of the seat and a coil damper unit system supporting the rear part of the seat. With this suspension seat structure, vibration is reduced as follows. A seat rear portion that supports the lumbar region of the operator is supported by an elastic member that has lateral rigidity and has large vertical elastic deformation, for example, a coil damper unit system. On the other hand, the front portion of the seat is supported by an elastic member having lateral rigidity and a small vertical elastic deformation, for example, a rubber spring system. Further, the lateral vibration (lateral direction) of the seat is restrained by the lateral rigidity of the rubber spring system and the lateral rigidity of the coil damper unit system. The longitudinal vibration of the seat is restrained by the lateral stiffness of the rubber spring system.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIG. FIG. 1 shows an example of a suspension seat structure for a construction machine. The suspension 2 of the seat 1 includes a rubber spring system 3 that supports the front portion of the seat 1 and a coil damper unit system 4 that supports the rear portion of the seat 1. Here, the rear part of the seat 1 is supported by the coil damper unit system 4, and the front part is supported by the rubber spring system 3.
Support.

Further, since the rear part of the seat 1 supports the waist of the operator, it is necessary to increase the vertical stroke. On the other hand, it is better that the front part has less stroke. Therefore, in the present embodiment, correspondingly, the rear portion of the seat 1 is supported by the coil damper unit system 4 with a large stroke. Also, the front part is
With the rubber spring system 3, it is supported with a small stroke.

The lateral rigidity (left-right direction) of the suspension 2 is determined by the lateral rigidity of the comb spring system 3 and the lateral rigidity of the coil damper unit system 4. Therefore, the lateral (left-right) vibration of the seat 1 is restricted by the lateral rigidity of the rubber spring system 3 and the lateral rigidity of the coil damper unit system 4. On the other hand, the rigidity of the suspension 2 in the front-rear direction is the lateral rigidity of the rubber spring system 3. Therefore, the vibration of the seat 1 in the front-rear direction is restricted by the lateral rigidity of the rubber spring system 3.

Further, the rubber spring system 3 is provided as a left and right pair in this embodiment. The pair of left and right rubber spring systems 3 are vertical when viewed from the side, and are attached in a substantially V shape when viewed from the front of the seat 1. On the other hand, a pair of left and right coil damper unit systems 4 are provided in this embodiment. The pair of left and right coil damper systems 4 are vertical when viewed from the side, and are mounted in a substantially V shape when viewed from the rear of the seat 1. The reason why the seat 1 is supported by the rubber spring system 3 and the coil damper system 4 which are set in a substantially C-shape in this way is to improve the static balance as a suspension.

Further, the rubber spring system 3 of this embodiment is
As shown in FIG. 2A, the rubber spring 5 has holes 8 formed at the upper and lower ends thereof. The rubber spring 5 is attached by inserting one hole 8 into the boss 10 of the seat support 9 and inserting the other hole 8 into the boss 11 on the seat 1 side. The boss 11 on the seat 1 side is the cushion 1 of the seat 1.
It is welded to the frame 13 attached to the No. 2.

As shown in FIG. 2B, the coil damper unit system 4 of this embodiment comprises a coil spring 6 and a damper 7 provided on the inner peripheral side of the coil spring 6. . The damper 7 is composed of a tube 15 with a head 14 and a rod 16 slidably provided in the tube 15. On the other hand, in order to attach the coil damper unit system 4, the earpiece 17 welded to the seat support 9 and the earpiece 19 attached to the back 18 of the seat 1 are provided. The upper end of the coil damper unit system 4 is the head 14
Is attached to the ear piece 19 of the back 18 by a pin 20 and a nut 21. The lower end of the rod 16 is attached to the ear piece 17 of the seat support 9 by the pin 22 and the nut 2.
Attached by 3.

In the present embodiment, the seat support 9 is entirely formed in a substrate shape, and the upper surfaces of the left and right ends are inclined upward. This inclined surface is a rubber spring system 3
This is for supporting the coil damper unit system 4 and the coil damper unit system 4 in a substantially C-shape. The seat support 9 has a pair of bosses 10 welded to the front portions of the left and right inclined surfaces to support the rubber spring system 3 in a substantially C-shape. Also,
Ear lugs 17 are symmetrically attached to the rear portions of the left and right inclined surfaces to support the coil damper unit system 4 in a substantially C-shape.

According to the construction machine suspension sheet configured as described above, vibration is reduced as follows.
When the hydraulic excavator travels, the vibration of the crawler belt is transmitted from the lower traveling body to the upper revolving body, and further transmitted to the seat 1 via the swing frame and the cab floor. The vibration transmitted to the seat is reduced by the suspension of the present invention from 2 as follows. Seat 1 that supports the waist of the operator
The rear part of the coil damper unit system 4
It is supported by a large stroke.

On the other hand, the front portion is supported by the rubber spring system 3 with a small stroke. Therefore, the burden on the operator can be reduced by adapting to ergonomics.
Further, the lateral (left-right) vibration of the seat 1 is restrained by the lateral rigidity of the rubber spring system 3 and the lateral rigidity of the coil damper unit system 4. The longitudinal vibration of the seat 1 is restrained by the lateral rigidity of the rubber spring system 3.

In the above embodiment, a rubber spring system is illustrated as an elastic member having lateral rigidity and little vertical elastic deformation, and a coil damper unit system is illustrated as an elastic member having lateral rigidity and large vertical elastic deformation. However, in the present invention, with respect to the same load applied to the seat, an elastic member having a small elastic deformation in the vertical direction and an elastic member having a large elastic deformation may be separately used for the front and rear, and the kind of the elastic member is the same as that of the above-mentioned embodiment. Of course, it is not limited. Further, the cab of the construction machine may have a structure having only an operator seat, and the cab may not be formed.

[0017]

According to the suspension seat structure for a construction machine of the present invention described above, the following effects can be obtained. (1) It is composed of an elastic material having different elastic deformation under the same load, for example, a coil damper unit system and a rubber spring system. Therefore, the mechanism / structure of the suspension is simple and can be manufactured at low cost. Such a suspension is suitable for a small construction machine such as a mini excavator. (2) The comb-pane system is provided in a pair on the left and right, and is arranged in a substantially V shape when viewed from the front of the seat. Therefore, the static balance of the suspension is improved. (3) The coil damper unit system is preferably provided in a pair on the left and right, and is arranged in a substantially C shape when viewed from the rear of the seat. Therefore, the static balance of the suspension is improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an entire embodiment of a suspension seat for a construction machine of the present invention, (a) is a front view, (b) is a side view, and (c) is a rear view.

2 is an enlarged view showing a suspension of the seat of FIG. 1, (a) is an enlarged view of a portion surrounded by W in FIG. 1a,
(B) is an enlarged view of a portion surrounded by X in FIG. 1c.

FIG. 3 is a side view showing the entire hydraulic excavator.

FIG. 4 is a front view of the hydraulic excavator of FIG.

5 is an exploded perspective view around the cab of the hydraulic excavator of FIG.

FIG. 6 is a perspective view showing a state in which the cab of FIG. 5 is attached.

FIG. 7 is a side view of the cab of FIG.

FIG. 8 is an enlarged view of a portion surrounded by Y in FIG.

FIG. 9 is a perspective view showing an outline of a conventional seat.

10 is a perspective view showing a state in which the seat of FIG. 9 is attached to a cab.

11 is a schematic side view of the attachment state of FIG.

12A and 12B are side views showing a conventional seat, FIG. 12A shows one using a parallel link mechanism, and FIG. 12B shows one using an X link mechanism.

[Explanation of symbols]

 1 ... Seat 2 ... Suspension 3 ... Rubber spring system 4 ... Coil damper unit system 9 ... Seat support 34 ... Cab 30 ... Hydraulic excavator as an example of construction machine

Claims (4)

[Claims] 1. A suspension seat structure for a construction machine, comprising a seat supported through a suspension, wherein the suspension is an elastic member having lateral rigidity and having little elastic deformation up and down, and a front portion of the seat. A suspension seat structure for a construction machine, in which a rear portion of the seat is supported by an elastic member that has a lateral rigidity and that has a large up and down elastic deformation. 2. The suspension according to claim 1, further comprising a rubber splash system for supporting a front portion of the seat and a coil damper unit system for supporting a rear portion of the seat. Suspension seat structure for construction machinery described. 3. The suspension seat structure for a construction machine according to claim 2, wherein a pair of the left and right rubber spring systems are provided and arranged in a substantially C-shape when viewed from the front of the seat. 4. The coil damper unit system,
The suspension seat structure for a construction machine according to claim 2 or 3, wherein a pair of left and right sides are provided and arranged in a substantially V shape when viewed from the rear of the seat.