JPH0589553U - Lever stand structure in backhoe - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a lever stand structure for a small turning type backhoe for excavating the ground. [Structure] In the present invention, the control unit 5 is provided at the front of the driver's seat 15.
And a lever stand 16 projecting from the control section 5, and the lever stand 16 is provided with an operation lever 18 and a control valve.
In the backhoe A in which the 20 are arranged in an interlocking manner, the distance between the rear side surface 16a of the lever stand 16 and the seat position 15a is lower than the upper position 16b of the lever stand 16.
The purpose of the present invention is to provide a lever stand structure in a backhoe, which is characterized in that 16c is widely configured.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lever stand structure in a small turning type backhoe for excavating the ground.

[0002]

[Prior Art]

 Conventionally, in a backhoe, as shown in FIG. 11, a box-shaped lever stand 116 is vertically projected on a control section 105 provided in front of a driver's seat 115, and an operation lever 118 is mounted on the lever stand 116. And a control valve 120.

The distance between the rear side surface 116a of the lever stand 116 and the seat position 115a is the same at both the upper side position 116b and the lower side position 116c of the rear side surface 116a.

The operating lever 118 is used to control the boom or bucket of the backhoe, and is erected on the upper surface of the lever stand 116 and connected to the spool 119 of the control valve 120.

The control valve 120 is mounted inside the lever stand 116 perpendicularly to the step surface 117 of the control unit 105, and is connected to the operation lever 118 via the spool 122 and at the same time, the control valve 120 is connected to the operation lever 118. From 120, a hydraulic pipe 121 is led out and connected to a hydraulic cylinder for operating a boom or a bucket.

In the figure, reference numeral 125 is a cover of the lever stand 116.

[0007]

[Problems to be solved by the device]

 However, the structure of the lever stand 116 as described above has the following problems.

That is, as shown in FIG. 12, since the control valve 120 is vertically installed in the lever stand 116 provided in the steering section 105 in front of the driver's seat 115, the control valve 120 The hydraulic pipe 121 that is led out and extends downward along the control valve 120 causes the rear side surface 116a of the lever stand 116 to project to the driver's seat 115 side, and is located near the operator's foot. The lower position 116c on the rear side surface 116a of the lever stand 116 to be placed also projects to the side of the seat 115, and the operator's foot space is extremely narrowed.

Therefore, it is inconvenient for the operator to get on and off the vehicle, and it is very dangerous if the operator leans on the lever stand 116.

Further, the control unit 105 becomes very cramped, and it cannot be said that it is a good working environment for the operator, and improvement thereof has been desired.

[0011]

[Means for solving the problem]

 The present invention relates to a backhoe in which a steering section is provided in front of a driver's seat, a lever stand is projected from the steering section, and an operating lever and a control valve are arranged in an interlocking manner on the lever stand. The distance between the rear side of the lever stand and the seat position is to provide a lever stand structure in the backhoe which is characterized in that the lower position is wider than the upper position of the lever stand.

[0012]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a side view of a backhoe having a control valve mounting structure according to the present invention, and FIG. 2 is an explanatory view showing the control valve mounting structure.

As shown in FIG. 1, in the backhoe A, a semicircular swivel base 4 is attached to a central portion of a crawler type traveling device 1 via a swivel bearing 3, and a prime mover 2 is mounted on the swivel base 4. A bonnet 6 that stores such items is installed.

Further, a boom bracket mounting fulcrum 7 is provided on the front part of the swivel base 4, and a boom 11 for supporting an excavation work, an arm 10, etc. is supported at the mounting fulcrum 7. The boom bracket 8 is attached, the boom 9 is mounted on the bracket 8, and the arm 10 and the bucket 11 are connected to the tip of the boom 9 so as to be able to move up and down, thereby forming an excavation work section a. ..

In the swivel base 4, a driver's seat 15 is provided on the left side with respect to the traveling direction of the backhoe A, and a canopy roof 19 is provided above the seat 15 via a canopy support column 19a. ing.

A control unit 5 is provided in front of the driver's seat 15, a lever stand 16 is provided on the control unit 5, and an operation lever 18 is erected on the lever stand 16 and the lever stand 16 is provided. Inside the stand 16, a control valve 20 is attached which is operatively connected to the operating lever 18 via a link mechanism (not shown).

The control valve 20 is connected to the boom cylinder 12 for operating the excavation work section a, the arm cylinder 13, and the bucket cylinder 14 via the hydraulic pipe 21, and the operator operates the operation lever 18. Thus, the control valve 20 can be opened and closed as appropriate to move the excavation work section a arbitrarily.

In FIG. 1, 6a is a bonnet opening / closing lid, 17 is a step surface of the control section 5, 25 is a cover of the lever stand 16, 31 is a blade having an earth removing work and a stabilizer function, and 32 is the blade 31. An operating cylinder for moving up and down, and 33 is a pivot pin that connects the bucket 11 and the bucket operating link 34.

The overall configuration of the backhoe A in this embodiment is as described above, and the gist of the present invention is that in the above configuration, the rear side surface 16a of the lever stand 16 protruding from the control section 5 and the seat position. The lower position 16c of the lever stand 16 is wider than the upper position 16b of the lever stand 16.

That is, as shown in FIG. 2, the control valve 20 is installed inside the lever stand 16 protruding in front of the driver's seat 15 and the upper portion of the control valve 20 is inclined toward the driver's seat 15 side. The lower position 16c of the lever stand 16 on the rear side surface 16a of the lever stand 16 is formed parallel to the control valve 20 that is attached to the driver's seat 15 side in an inclined state. It is structured so that the foot space is wide.

As described above, since the control valve 20 is inclined, the hydraulic pipe 21 that extends from the control valve 20 and extends downward also moves downward in the same inclined state as the control valve 20. Therefore, the distance between the lower position 16c on the rear side surface 16a of the lever stand 16 and the seat position 15a of the driver's seat 15 can be made wider than the upper position 16b.

Therefore, it is possible to widen the foot space of the operator, which is conventionally narrowed by the hydraulic pipe 21 led out from the control valve 20.

With the above configuration, when the operator gets on or off the driver's seat 15, the lever stand 16 does not get in the way and there is no danger of getting caught.

Further, since the driving posture does not become cramped, it is hard to get tired, the working environment for the operator is improved, and the working efficiency is also improved.

Further, as the control valve 20 is tilted, the operation lever 18 linked to the control valve 20 is also tilted toward the driver's seat, so that the operator can easily operate the operation lever 18. Become.

When mounting the control valve 20, the axis line of the spool 22 of the control valve 20 connected to the operation lever 18 which is erected on the upper portion of the lever stand 16 is located closer to the driver than the central axis of the operation lever 18. It is designed to offset to the side opposite to seat 15.

Normally, the operation pattern of the operation lever 18 in the backhoe A is configured so that it can be appropriately changed according to the operator's preference. For that purpose, the spools of the operation lever 18 and the control valve 20 are set. The axis line of 22 is arranged with an offset, and the operation lever 18 and the spool 22 of the control valve 20 are interlockingly connected via a link mechanism.

Therefore, also in the present invention, with the same configuration, when the operation pattern is desired to be changed, the operation pattern can be changed by simply replacing the link mechanism with a unit.

Next, as another embodiment, a canopy roof formed so that the operator will not be exposed to rainwater even in rainy weather will be described.

That is, as shown in FIG. 3, the roof body 60 of the canopy roof 59 is provided with two rainwater receiving holes 61, 61, and further, the roof body 60 is guided so as to guide rainwater in a certain direction. It is formed by inclined plates 60b and 60c having an inclination.

As shown in FIG. 4, both of the inclined plates 60b and 60c have a small inclination (inclined plate 60c) when the blade 31 provided at the rear part of the backhoe A is lowered to the maximum. Even if there is any rainwater, it is formed so as to have an inclination angle α that can guide the rainwater to the rainwater receiving holes 61. Therefore, during the work of the backhoe A during rainy weather, all the rainwater is stored in the rainwater receiving holes 61, 61. It will be guided and will not drip from the side edge of the canopy roof 59, and will not be caught by the operator.

Moreover, since the rainwater receiving holes 61, 61 are provided so as to be located on the inner side of the flange portion 60a provided on the outer peripheral portion of the roof body 60, it is difficult to see from the outside and the appearance is impaired. There is no.

Here, a structure for draining rainwater collected in the rainwater receiving holes 61, 61 is shown in FIGS. 5 and 6.

The one shown in FIG. 5 is one in which rainwater is discharged through the inside of the canopy strut 59a. A drainage pipe 62 is fitted in the strut 59a, and the pipe 62 and the rainwater receiving hole are fitted. 61,61 are connected in series.

In this case, the drainage pipe 62 is not visible from the outside and the appearance is not spoiled.

Next, as shown in FIG. 6, a drainage pipe 63 is provided in parallel outside the canopy support column 59a along the supportline 59a, and rainwater receiving holes 61, 61 are connected to the drainage pipe 63. Rainwater is drained in a row.

In this case, there is no need to modify the canopy support column 59a, and the cost is low.

Another embodiment is shown in FIG.

This is because, for example, in the bucket actuating link 34 shown in FIG. 1, in order to prevent rattling of the bucket 11 due to side surface wear of the link side surface portion 78 of the link 34, a normal grease supply is applied to the link. It is configured to have an appropriate preload on the side surface.

That is, in FIG. 7, 33 is a pivot pin, and the bucket 11 and the bucket operating link 34 are pivotally attached by the pivot pin 33 via the piston bush 73.

An O-ring 74 is attached to the piston bush 73, and a bush rotation preventing ball 75 is arranged between the bush 73 and the link 34.

A grease filling slot 71 is formed inside the pivot pin 33, and a grease nipple 72 is attached to the tip of the grease filling slot 71.

Further, a grease communication hole 76 is provided from the middle of the grease filling long hole 71 toward the outer peripheral surface of the pivot pin 33, and the grease communication hole 76 is provided to the pivot pin 33 and the bucket operating link 34. And a precompression chamber 77 formed between and.

Further, side face greasing portions b are provided at appropriate intervals on both sides of the grease communicating hole 76, and the side face greasing portions b are relief valve elements arranged in the side face greasing holes 79. It comprises a greasing hole closing ball 80, a spring 81, a spring locking plug 82, and a side greasing passage 83.

The structure and effect of the rattling prevention structure of the bucket 11 due to the side surface wear of the link side surface portion 78 will be described below.

That is, the grease supplied from the grease nipple 72 first enters the preload chamber 77 through the grease communication hole 76, pushes the piston bush 73 wide by the pressure, and an appropriate preload is generated in the preload chamber 77. Then, the ball 80 for closing the greasing hole of the side greasing portion b is pushed up to fill the link side surface 78 from the side greasing passage 83.

When the grease in the link side surface 78 decreases while the bucket 11 is in use, the grease in the preload chamber 77 is extruded, and the grease is blocked by the greasing hole in the side greasing portion b. The ball 80 is pushed up, and the side surface greasing passage 83 refills the side surface 78 of the link.

By repeating such an action, the link side surface portion 78 is always filled with grease, wear can be prevented, and rattling noise can be prevented.

Moreover, since it is only necessary to perform a normal grease replenishing operation, it is not necessary to install a special operation or mechanism for preventing backlash, which saves labor.

As another embodiment, there is a bucket cylinder 90 mounting structure as shown in FIG.

For example, in the case of the conventional bucket cylinder 14 mounting structure as shown in FIG. 1, this is the rod 14a of the bucket cylinder 14 located near the bucket 11 when excavating a gutter or deep digging work. It is possible to prevent damage to the cylinder tube 14b and the stones, etc., between the cylinder tube 14b and the hydraulic tube 36, which could scratch the tube 36 and cause oil leakage. It is for.

That is, as shown in FIG. 8, the bucket cylinder 90 is attached so that the rod 90a of the cylinder 90 is located on the boom 9 side, and the compression oil passage 92 and the compression oil passage 92 are provided inside the rod 90a. An expansion side oil passage 93 is provided (FIGS. 9 and 10).

A protective cover 94 for protecting the rod 90a is attached to prevent the rod 90a from being scratched.

In FIG. 8, 90b is a cylinder tube, 94a is a mounting bolt for the protective cover 94, 10a is a mounting bracket for the bucket cylinder 90, and 97 is a hydraulic pipe.

The mounting structure of the bucket cylinder 90 will be described in more detail with reference to FIGS. 9 and 10.

FIG. 9 is a plan view of the bucket cylinder 90. A joint portion 96 formed at the tip of the rod 90a is provided with a contraction-side oil passage communication hole 92a and an extension-side oil passage communication hole 93a. It communicates with the provided contraction side oil passage 92 and extension side oil passage 93.

Further, as shown in FIG. 10, the rod 90a is screwed to the piston 95, and the contraction side oil passage 92 penetrating through the rod 90a is opened from the front side of the piston 95 to the outer peripheral surface of the rod 90a. However, the extension-side oil passage 93 penetrates to the end of the rod 90a and also to the end of the piston 95.

Therefore, the piston 95 is pushed up or pushed down by the pressure of the oil passing through the oil passages 92 and 93, respectively, and the rod 90a connected to the piston 95 is extended and contracted. Operate bucket 11.

As described above, the contraction side oil passage 92 and the extension side oil passage 93 are provided in the rod 90a of the bucket cylinder 90, and the bucket cylinder 90 is attached so that the rod 90a is located on the boom 9 side. In addition, the provision of the protective cover 94 for protecting the rod 90a eliminates the need for the hydraulic tube 36 (see FIG. 1) that has been a factor that causes oil leakage due to damage caused by stones or the like. Can prevent oil leakage.

Further, since the rod 90a is moved away from the bucket 11 side, and since the protection cover 94 is provided, the rod 90a that has been precision processed and plated is not damaged, and there is no fear of oil leakage. ..

Further, the operator can concentrate on the work without worrying about damaging the rod 90a or the hydraulic tube 36, and the work efficiency is improved.

[0063]

[Effect of the device]

 According to the present invention, the distance between the rear side of the lever stand protruding from the control section of the backhoe and the seat position is configured such that the lower position is wider than the upper position of the lever stand. The foot stand can have a large foot space, and therefore, when the operator gets on or off the driver's seat, the lever stand does not get in the way and there is no danger of getting caught.

Further, the driving posture is not cramped, the working environment for the operator is improved, and the work efficiency is also improved.

[Brief description of drawings]

FIG. 1 is a side view of a backhoe having a control valve mounting structure according to the present invention.

FIG. 2 is an explanatory view showing a mounting structure of the control valve.

FIG. 3 is a perspective view of a canopy roof according to another embodiment.

FIG. 4 is an explanatory view showing a tilted state of a roof body of the canopy roof.

FIG. 5 is an explanatory view showing one form of a rainwater drainage structure using the canopy roof.

FIG. 6 is an explanatory diagram showing the same modification example.

FIG. 7 is a sectional view of a mounting portion of a bucket and a bucket operating link according to another embodiment.

FIG. 8 is an explanatory view showing a bucket cylinder mounting structure according to another embodiment.

FIG. 9 is a plan view of the bucket cylinder.

FIG. 10 is a schematic sectional side view of the bucket cylinder.

FIG. 11 is an explanatory view showing a conventional control valve mounting structure.

[Explanation of symbols]

 A Backhoe 5 Control unit 15 Driver's seat 15a Seat position 16 Lever stand 16a Rear side 16b Upper position 16c Lower position 18 Control lever 20 Control valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenji Akiyama 428 Enami, Okayama City, Okayama Prefecture Seirei Industry Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A steering section (5) is provided at the front of a driver's seat (15), and a lever stand (16) is projectingly provided on the steering section (5).
In the backhoe (A) in which the operation lever (18) and the control valve (20) are arranged in an interlocking connection on the lever stand (16), the rear side (16a) and the seat position (15a) of the lever stand (16) are And the upper position of the lever stand (16) (1
Lever stand structure in the backhoe, characterized in that the lower position (16c) is configured to be wider than that of 6b).