KR101061697B1 - Cover device of hydraulic cylinder - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a cover device for a hydraulic cylinder that can secure a large contact strength to a contact object and at the same time have a small number of parts, which is simple in structure and easy to paint.

For this purpose, the cover member 13 fixed to the tip end 8b1 of the rod part 8b of the boom cylinder 8 via the bolt 14 is made of, for example, a single sheet of steel sheet, and the cover The first member 13c is formed between the central portion 13a and one side end portion 13b fixed to the front end portion 8b1 of the rod portion 8b, and is bent to form a first projection portion 13c and a central portion 13a. It is formed between the other end 13d, and has the 2nd protrusion part 13e formed by bending. Moreover, the guide plate which holds the cover member 13 so that sliding to the cylinder part 8a of the boom cylinder 8 is being fixed to the cylinder part 8a.

Boom cylinder, rod part, bolt, boss part, cover device, center part

Description

Cover device for hydraulic cylinders {COVER DEVICE OF HYDRAULIC CYLINDER}

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side view showing a hydraulic excavator serving as an example of a working machine provided with one embodiment of a cover device for a hydraulic cylinder of the present invention.

Fig. 2 is an enlarged side view of the boom cylinder portion of the hydraulic excavator shown in Fig. 1;

3 is an enlarged view of a main part seen from the direction A of FIG. 2;

FIG. 4 is an enlarged view of section B of FIG. 2; FIG.

5 is a view showing a cover member provided in one embodiment of the present invention, (a) is a rear view, (b) is a front view of (a), and (c) is a side view of (b).

<Explanation of symbols for the main parts of the drawings>

5: boom

5a: boss section

5b: boss section

8: Boom Cylinder (Hydraulic Cylinder)

8a: cylinder part

8b: rod part

8b1: Tip

11: cover device

13: cover member

13a: center part

13a1: back side

13b: one end

13c: first protrusion

13c1: first recessed portion

13d: other end

13e: second projection

13e1: second recessed portion

13f: tip

13g: hole

14: Bolt

15: guide plate

15a: one end

15b: other end

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic cylinder cover device that protects a hydraulic cylinder provided in a working machine such as a hydraulic excavator from an external force.

There exists a thing described in patent document 1 as this kind of prior art. This patent document 1 has an inner cover fixed to a hydraulic cylinder capable of contacting a chisel or the like of a hydraulic breaker, that is, a bracket fixed to the front surface side of the boom cylinder by welding or the like with a boom cylinder, and disposed outside the inner cover. And an overall cover having a mountain shape, and having a sliding outer cover that is bolted to the distal end of the rod portion of the boom cylinder, and by such an inner cover and the outer cover, a contact object such as a chisel against the boom cylinder A cover device for protecting the boom cylinder is disclosed. This patent document 1 also describes a configuration in which a rear attachment plate, a reinforcing member or a flange member is fixedly attached to the rear surface of the outer cover by welding or the like, assuming a combination of the inner cover and the outer cover.

 [Patent Document 1] Japanese Patent Application Laid-Open No. 9-296474

Since the cover member has a multiple structure having at least an inner cover and an outer cover, the above-described prior art has a large rigidity and can secure a large contact strength against a chisel or the like of the hydraulic breaker. However, since it has an inner cover, an outer cover, etc., there are many parts, and this has a problem that manufacturing cost becomes expensive.

Moreover, when coating in the prior art mentioned above, the coating site | parts, such as the surface and back surface of an outer cover, the surface and back surface of an inner cover, become large, and this painting operation becomes easy to become complicated. Moreover, since the shape of a bracket part etc. requires painting of a complicated part, it can be considered that an unpainted part arises. Therefore, rust may arise from such an unpainted part, and contact strength may fall by this rust, and durability may deteriorate.

SUMMARY OF THE INVENTION The present invention has been made from the above-described actual shape in the prior art, and its object is to secure a large contact strength with respect to a contact object, and to cover a hydraulic cylinder with a small number of parts, a simple structure, and easy painting. To provide a device.

In order to achieve the above object, the present invention is a cover structure of a hydraulic cylinder having a cover member fixed to the distal end of a rod of a hydraulic cylinder and protecting the hydraulic cylinder from external force, wherein the cover member is made of a single sheet. At the same time, the cover member has a first projection formed between the central portion and one end portion which is fixed to the tip portion of the rod portion, and has a first projection portion formed by bending, and a second projection portion formed between the central portion and the other end portion and formed by bending. It is characterized by.

According to the present invention configured as described above, since the cover member is formed by sandwiching a central portion fixed to the distal end portion of the rod portion of the hydraulic cylinder and includes a first projection portion and a second projection portion formed by bending, it is possible to contact the hydraulic cylinder with great rigidity. A large contact strength with respect to a contact object, such as a bucket, can be ensured. In addition, since the cover member is made of one sheet, the total number of parts can be reduced. In addition, since the surface coating and the back coating of the single sheet material constituting the cover member are easy, the painting work is easy and the unpainted portion may not be generated.

Moreover, this invention is equipped with the guide plate which holds the said cover member so that sliding to the cylinder part of the said hydraulic cylinder is possible in the said invention, It is characterized by the above-mentioned.

According to the present invention configured as described above, the cover member can be slid and moved smoothly through the guide plate during the expansion and contraction of the hydraulic cylinder.

Moreover, this invention fixed the said guide plate to the said cylinder part of the said hydraulic cylinder in the said invention, It is characterized by the above-mentioned.

EMBODIMENT OF THE INVENTION Hereinafter, the most preferable form for implementing the cover apparatus of the hydraulic cylinder which concerns on this invention is demonstrated based on drawing.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side view showing a hydraulic excavator serving as an example of a working machine provided with one embodiment of a cover device for a hydraulic cylinder of the present invention. The hydraulic excavator shown in FIG. 1 includes a traveling member 1 and a swinging member 2 disposed on the traveling member 1. This turning member 2 is provided with a driver's seat 3. The boom 5 is rotatably connected to the front side of the turning member 2 via the swing post 4 in the up-down direction. An arm 6 is connected to the distal end of the boom 5 so that the bucket 7 is rotatably connected to the distal end of the arm 6 in the vertical direction. Moreover, the hydraulic cylinder which rotates the boom 5, ie, the boom cylinder 8, the arm cylinder 9 which rotates the arm 6, and the bucket cylinder 10 which rotates the bucket 7 are provided. . In the front side part of the boom cylinder 8, the cover apparatus 11 which is one Embodiment of this invention which protects this boom cylinder 8 from external force, ie, the contact object, such as the bucket 7, is attached.

FIG. 2 is an enlarged side view of the boom cylinder portion of the hydraulic excavator shown in FIG. As shown in Fig. 2, the boom cylinder 8 includes a cylinder portion 8a, the distal end of which is rotatably connected to the swing post 4, and a rod portion slidably accommodated in the cylinder portion 8a. It consists of 8b, and the front-end | tip part 8b1 of the rod part 8b is rotatably connected to the boom 5 by the support pin 12. As shown in FIG. The cover device 11 of the present embodiment includes a cover member 13 that constitutes a main part, and a bolt 14 that fixes the cover member 13 to the tip portion 8b1 of the rod portion 8b of the boom cylinder 8. ) And a guide plate 15 for holding the cover member 13 in a sliding manner with respect to the cylinder portion 8a of the boom cylinder 8. The guide plate 15 is fixed to the cylinder part 8a of the boom cylinder 8 by welding etc., for example.

FIG. 3 is an enlarged view of a main part seen from the direction A of FIG. 2, FIG. 4 is an enlarged view of the B section of FIG. 2, FIG. (B) is a front view of (a), (c) is a side view of (b).

3 to 5, the cover member 13 constituting the main part of the cover device 11 of the present embodiment is made of, for example, a single sheet of steel sheet, and includes a front surface and a back surface. Painting such as rust is applied to the front surface of the surface. As shown in Fig. 5C, the cover member 13 is disposed between the central portion 13a and one side end portion 13b fixed to the front end portion 8b1 of the rod portion 8b of the boom cylinder 8. Formed between the first protrusion 13c of the mountain shape which is formed, bent, convex toward the outside, and the central portion 13a and the other end 13d, is formed by bending, and is convex toward the outside. A mountain-shaped second projection 13e is provided.

As shown in Fig. 3, the tip 8b1 of the rod 8b of the boom cylinder 8 is disposed between the pair of bosses 5a and 5b formed inside the boom 5, As described above, the bosses 5a and 5b and the tip portion 8b1 of the rod portion 8b of the boom cylinder 8 are connected by the support pin 12.

Reference numeral 13a1 in FIG. 5 (a) denotes the rear surface of the above-described central portion 13a, where 13c1 is a first recessed portion that forms the first protrusion 13c, and 13e1 is a second recessed portion that forms the second protrusion 13e. . As shown in Fig. 5A, a hole 13g through which the above-described bolt 14 is inserted is formed in the rear surface 13a1 (center portion 13a) of the front end portion 13f. .

In addition, as shown in FIG. 4 and the like, one end 13b of the cover member 13 is formed in an L shape, and is disposed to be in sliding contact with one end 15a of the guide plate 15. Similarly, the other end 13d is also formed in an L shape, and is arranged to be in sliding contact with the other end 15b of the guide plate 15.

1 and 2, the cover member 11 covers the front side of the extended rod part 8b in the state where the boom cylinder 8 was extended. The rod member 8b of the boom cylinder 8 is prevented by the cover member 11 from contacting the rod portion 8b of the boom cylinder 8 by winding the arm 6 or the like. ) Is protected. In addition, when contracting the boom cylinder 8 to lower the boom 5, the cover member 13 is guided to the guide plate 15 and slides downwards integrally with the contraction of the rod portion 8b. . For example, in the most retracted state, the cover member 13 protects the vicinity of the tip portion 8b1 of the rod portion 8b and the cylinder portion 8a from external forces.

According to this embodiment, even if the external force is supplied to the surface of the cover member 13, for example, even if the bucket 7 is in contact with the cover member 13, the cover member 13 is the center portion (13a) Since the 1st protrusion part 13c and the 2nd protrusion part 13e which are pinched and bent and processed are provided, it is possible to ensure the big contact strength with respect to the contact object, such as the bucket 7, with great rigidity, and such a contact The boom cylinder 8 can be protected so that the boom cylinder 8 is not damaged by an external force from the object.

In addition, since the cover member 13 is made of one sheet material, the total number of parts can be reduced. Thereby, manufacturing cost can be made low. Moreover, since the surface coating and the back surface coating of the single sheet | plate material which comprise the cover member 13 are easy, the whole surface coating is easy and the efficiency of this coating operation can be improved. In addition, since the unpainted portion can be prevented from occurring, the generation of rust accompanying such an unpainted portion can be suppressed to improve durability.

In addition, since the guide plate 15 is fixed to the cylinder portion 8a of the boom cylinder 8, the cover member 13 can be smoothly slid with the expansion and contraction of the boom cylinder 8, and the stable boom It is possible to have a highly reliable structure capable of realizing the protection of the cylinder 8.

Moreover, although the boom cylinder 8 was mentioned as an example of the hydraulic cylinder protected by the cover member 13 in the said embodiment, this invention is not limited to the boom cylinder 8, It is suitable also for protection of other hydraulic cylinders.

The present invention can secure a large contact strength with respect to the contact object by the first and second projections of the cover member, and can reduce the total number of parts because the cover member is made of one sheet material. Thereby, manufacturing cost can be made low. Moreover, painting work is easy and the improvement of the efficiency of this painting work can be implement | achieved. In addition, since the unpainted portion may not be generated, generation of rust associated with such an unpainted portion can be suppressed, and durability can be improved as compared with the conventional one.

Claims (3)

In the cover structure of the hydraulic cylinder which is fixed to the front-end | tip part of the rod of a hydraulic cylinder, and provided with the cover member which protects this hydraulic cylinder from an external force, The hydraulic cylinder is made of a boom cylinder, The cover member is made of one sheet material, The cover member is formed between the central portion and one side end portion which is fixed to the front end portion of the rod portion of the boom cylinder, and is formed between the first protrusion portion formed by bending and the second portion formed between the center portion and the other end portion and bent. With protrusions, And a guide plate for slidably holding the cover member with respect to the cylinder portion of the boom cylinder, While fixing the guide plate to the cylinder portion of the boom cylinder, And the one end portion and the other end portion of the cover member are formed so as to be in sliding contact with the corresponding side portion of the guide plate, respectively. delete The cover device for a hydraulic cylinder according to claim 1, wherein the guide plate is fixed to the cylinder portion of the hydraulic cylinder.

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