JPH07157295A - Hydraulic piping structure for forklift - Google Patents

Abstract

PURPOSE:To reduce a number of part items by integrally forming a chain and hose restricting member and a pulley mounting member CONSTITUTION:A pulley bracket 7 is formed in a downward facing almost U-shape and mounted so as to stride a chain wheel support 3 in an upper part of a piston rod 2 of a lift cylinder 1. In this pulley bracket 7, a step differenced part 7b is set as a chain restricting part opposed with a fixed space provided in the upper of a lift chain 6 linked to a chain wheel 5. Right/left vertical plate parts 7a in the upper from the step differenced part 7c are formed as a pulley mounting part, to rotatably arrange four hose pulleys 11 through a pulley supporting shaft 9 between these vertical plate parts 7a. Further, an upper plate part 7c, opposed with a fixed space apart in the upper of a hydraulic hose 13 mounted in the hose pulley 11, serves as a hose restricting part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forklift of a type in which a lift cylinder is arranged substantially in the center between left and right masts, and more specifically, a hydraulic piping structure in which a hydraulic hose is arranged along the lift cylinder. Regarding

[0002]

2. Description of the Related Art Generally, in a forklift having a three-stage mast, a front lift cylinder for a free lift is installed upright between the left and right masts. In a forklift of the type in which such a front lift cylinder is arranged in the center between the masts, the hydraulic pipe for attachment is routed along the front lift cylinder.

7 and 8 exemplify a conventional hydraulic piping structure in a mast applied to a forklift of a three-stage mast, and FIG. 9 shows a part of parts applied to the piping. As shown in the figure, a chain wheel support 35 for rotatably supporting a pair of left and right chain wheels 34 is fixed to the upper part of the piston rod 32 of the front lift cylinder 31, and a lift bracket 47 is raised and lowered on the chain wheel 34. A lift chain 33 for hanging is mounted. Then, conventionally, a hose pulley 36 for a hydraulic hose is attached using the chain wheel support 35.

The illustrated example shows a hydraulic piping structure when there are two attachments to be operated. A hose pulley 36 is attached to the left and right shaft ends 35a of a chain wheel support 35 supporting the chain wheel 34 via a boss 37.
It is installed individually. A hose bracket 39 is attached to the center upper portion of the chain wheel support 35 with bolts 38, and one hose pulley 36 is attached to each of the left and right shaft portions 39a of the pulley bracket 39. And the total of these four hose pulleys 36
A hydraulic hose 40 is attached to the.

Further, since the lift chain 33 or the hydraulic hose 40 may fall off from the chain wheel 34 or the hose pulley 36 due to the vibration of the lift cylinder 31 during the ascending / descending operation or the traveling of the vehicle, the boss 37 is used.
A chain regulating member 41 for preventing the chain and the hose from coming off is attached to the end of the bolt with a bolt 41a, and a hose regulating member 42 for preventing the hose from coming off the hose bracket 39.
Is attached by a bolt 42a to prevent the lift chain 33 and the hydraulic hose 40 from coming off. In FIG. 8, 43 is an outer mast, 44 is a middle mast, 45 is an inner mast, and 46 is a left and right rear lift cylinder arranged behind the left and right masts.

[0006]

However, as described above, in the conventional hydraulic piping structure in the mast, the boss 37, the hose bracket 39, the chain and the hose are provided above the front lift cylinder 31. Control member 4
Since it has a structure in which a large number of parts such as 1, 42 are individually attached, there are problems such as poor assembly and troublesome parts management. In addition, there are two hydraulic pressures on the outside of the lift chain. Due to the arrangement of the hoses 40 side by side, there is a problem that the front view is poor.

In view of the above problems, the present invention reduces the number of parts by integrating the chain and hose restricting member and the pulley mounting member, and at the same time, improves the front field of view. Providing a piping structure is a technical problem to be solved.

[0008]

In order to solve the above problems, the present invention is configured as follows. That is, the invention of claim 1 is a forklift in which a lift cylinder is erected between the left and right masts, and a chain wheel support provided with a pair of freely rotatable left and right chain wheels is provided on the upper part of the cylinder rod of the lift cylinder. And a pulley bracket mounted on the chain wheel support so as to straddle the chain wheel support, and the pulley bracket is provided at a constant interval with respect to the chain mounted on the chain wheel. Left and right chain restricting parts that restrict the separation of the chain by facing each other, and a pulley mounting part that rotatably supports a plurality of hose pulleys arranged side by side above the chain wheel support via pulley supporting shafts, Opposes the hydraulic hose mounted on the hose pulley with a certain space. It is characterized by integrally including a hose restricting portion for restricting the disengagement of the hydraulic hose between.

According to the second aspect of the present invention, a lift cylinder is erected between the left and right masts, and a chain wheel support provided with a pair of rotatable left and right chain wheels is provided on the upper portion of the cylinder rod of the lift cylinder. A hydraulic piping structure of a forklift, comprising a pulley bracket mounted on the chain wheel support so as to straddle the chain wheel support. The pulley bracket includes a plurality of hose pulleys arranged side by side above the chain wheel support. A pulley mounting portion that rotatably supports the hydraulic hose via a pulley supporting shaft, and a hose restricting portion that restricts separation of the hydraulic hose by facing the hydraulic hose that is hooked on the hose pulley at a constant interval. Is integrally provided, and part of the pulley support shaft allows the chain wheel to Is characterized by being configured the left and right chain regulating portion for regulating the disengagement of the lift chain by opposed at a predetermined distance from the lift chain is hung.

[0010]

In the hydraulic piping structure for a forklift according to the first aspect of the invention, the pulley bracket is integrally provided with the chain restricting portion, the pulley attaching portion, and the hose restricting portion, so that the number of parts is greatly reduced. . Further, since the hose pulleys are arranged side by side above the chain wheel support, the hydraulic hose is arranged in the projection plane of the lift cylinder. Further, in the hydraulic piping structure for a forklift according to the invention of claim 2, since the chain restricting portion is constituted by a part of the pulley support shaft provided in the pulley mounting portion of the pulley bracket, compared to the invention of claim 1. Therefore, the number of parts does not increase, and the number is actually reduced.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, a first embodiment based on FIGS. 1 and 2
Will be explained. The illustrated lift cylinder 1 is a front cylinder of a three-stage mast device that can be freely lifted in a forklift, and in a full-free mast device, it is used for lifting a lift bracket and is erected at a substantially central portion between the left and right masts. At the same time, the body portion is supported by an inner mast tie beam (not shown), and the piston rod 2 is in a free state.

A chain wheel support 3 is fixed to the upper part of the piston rod 2 of the lift cylinder 1, and chain wheels 5 have bearings (not shown) respectively on horizontal shaft portions 4 formed on the left and right sides of the chain wheel support 3. It is rotatably attached via. A lift chain 6 is mounted on the chain wheel 5, and one end of the lift chain 6 is connected to a lift bracket (not shown) and the other end is connected to the lift cylinder 1.

Next, the hydraulic piping structure of the present embodiment applied to the forklift of the above-described three-stage mast will be described. A pulley bracket 7 is attached to the chain wheel support 3. As shown in FIG. 2, the pulley bracket 7 is formed by bending a laterally long plate material into a substantially downward U-shape, and is arranged so as to straddle the chain wheel support 3 and the left and right vertical plates thereof. The lower end of the portion 7a is fastened to the shaft end surfaces of the left and right horizontal shaft portions 4 of the chain wheel support 3 by the fixing bolts 8. In the present embodiment, as shown in FIG. 2, a bolt through hole for mounting provided on the lower end side of the left and right vertical plate portions 7a of the pulley bracket 7 is a long hole 7d that is long in the vertical direction. The mounting height can be adjusted during assembly.

Therefore, the upper side of the left and right vertical plate portions 7a of the pulley bracket 7 constitutes a pulley mounting portion, and the pulley support shaft 9 is horizontally arranged between the vertical plate portions 7a and both ends thereof are arranged. It is fastened to the vertical plate portion 7a by a fixing bolt 10. The pulley support shaft 9 has 4
The individual hose pulley 11 is rotatably supported while being positioned by the collar 12.

A stepped portion 7b serving as a chain restricting portion is formed in the middle of the left and right vertical plate portions 7a in the vertical direction. The stepped portion 7b opposes the lift chain 6 mounted on the chain wheel 5 so as to cover the lift chain 6 at a constant interval so that the stepped portion 7b restricts the lift chain 6 from being separated from the chain wheel 5. Furthermore, the upper plate portion 7c of the pulley bracket 7 constitutes a hose restricting portion. That is, the upper plate portion 7c faces the hydraulic hose 13 mounted on the hose pulley 8 so as to face the hydraulic hose 13 at a constant interval so as to prevent the hydraulic hose 13 from being detached from the hose pulley 11. The above-mentioned fixed interval refers to an interval required for preventing the lift chain 6 or the hydraulic hose 13 from coming off, and is preferably set to be slightly smaller than the groove depth of the chain wheel 5 or the hose pulley 11.

The hydraulic piping structure of this embodiment has the above-mentioned structure.
The pulley bracket 7 is provided with a chain restricting portion including left and right step portions 7b, a pulley attaching portion including left and right vertical plate portions 7a, and a hose restricting portion including an upper plate portion 7c. That is, the chain restricting member, the pulley attaching member, and the hose restricting member, which have been individually present in the past, are integrated, and as a result, the necessary parts are the pulley bracket 7 and the pulley supporting shaft 9. There are only two types, including the positioning collar 12, and the number of parts is greatly reduced compared to the conventional one. Therefore, it is possible to facilitate the assembling at the time of manipulating the hydraulic pipes, and it is easy to manage the parts.

Further, in the present embodiment, by arranging all four hose pulleys 11 side by side above the lift cylinder 1, the four hydraulic hoses 13 are arranged in the projection plane of the lift cylinder 1. , It is possible to reduce the dead zone from the driver's seat between the left and right masts and improve the front view. Moreover, by setting the step portion 7b on the pulley bracket 7, the distance between the left and right vertical plate portions 7a as the pulley mounting portions is set to the minimum distance required for arranging the four hose pulleys 11, The upper part of the stepped portion 7b is utilized as the visible range, which is more advantageous in improving the front visual field.

Further, in this embodiment, the pulley bracket 7
Since the mounting height of the above with respect to the chain wheel support 3 can be adjusted by the elongated hole 7d, it is possible to adjust the facing interval of the stepped portion 7b with respect to the lift chain 6 to be an appropriate interval during assembly.

Next, a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, the stepped portion 7b of the pulley bracket 7 of the above-described Embodiment 1 is eliminated, and instead a part of the pulley support shaft 9 constitutes a chain regulation portion. As shown in the drawing, the pulley bracket 7 formed by bending a horizontally long plate material into a downward substantially U-shape has left and right vertical plate portions 7a formed upright over the entire length,
In the middle thereof, the pulley support shaft 9 is fastened with a fixing bolt 10, and four hose pulleys 11 are attached to the pulley support shaft 9 while being positioned by the collar 12. Then, the collar 12 fitted to the pulley support shaft 9
Among them, the side collar 12a located on the outer side faces the chain wheel 5, and this constitutes a chain restricting portion that restricts the lift chain 6 from being disengaged.

That is, the side collar 12a has a function of not only functioning as a collar, but also having a function of restricting the lift chain 6 from separating. In this case, the side collar 12a has a proper facing interval with the lift chain 6. Therefore, for example, the diameter is set to be larger than that of the other collar 12, or the bulging portion 12b is set on the outer periphery of the center in the axial direction as shown in the drawing.
The upper plate portion 7c constitutes a hose restricting portion for preventing the hydraulic hose 13 from coming off, and the bolt through hole for mounting the bracket is a long hole 7d which is vertically long and the same as in the first embodiment. is there.

Therefore, the second embodiment configured as described above
Also in the case of the hydraulic piping structure described above, it is possible to obtain the same effects as those of the first embodiment.

In the above-described first and second embodiments, the case where one long thin plate member is bent to integrally form the upper plate portion 7c as the hose restricting portion has been described, but as shown in FIG. 5, for example, The separately provided flat plate 14 is fixed between the left and right vertical plate portions 7a by welding or bolts, or as shown in FIG.
As shown in, the cylindrical bar member 15 is welded or bolted between the left and right vertical plate portions 7a, and fixed in a bridging manner.
You may change so that it may comprise a hose control part.

[0023]

As described above in detail, according to the present invention, in the hydraulic piping structure arranged along the lift cylinder erected between the left and right masts, the chain and the hose regulating member and the pulley mounting member are integrated. By doing so, the number of parts of the piping member can be reduced, the assemblability can be improved, and the parts management can be facilitated. Further, in the present invention,
Since the hydraulic hose can be arranged in the projection plane of the lift cylinder, the front view is improved, which is effective in improving work safety and efficiency.

[Brief description of drawings]

FIG. 1 is a front view of a hydraulic piping structure according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the pulley bracket of the first embodiment.

FIG. 3 is a front view of a hydraulic piping structure according to a second embodiment.

FIG. 4 is a perspective view of a pulley bracket according to a second embodiment.

FIG. 5 is a perspective view showing a modification of the pulley bracket.

FIG. 6 is a perspective view showing another modification of the pulley bracket.

FIG. 7 is a front view of a conventional hydraulic piping structure.

FIG. 8 is a plan view of the same.

FIG. 9 is a diagram of a part of a part applied to a conventional hydraulic pipe, (A) shows a boss, a chain, and a hose restricting member, and (B) shows a pulley bracket and a hose restricting member.

[Explanation of symbols]

1 ... Lift cylinder 2 ... Piston rod 3 ... Chain wheel support 5 ... Chain wheel 6 ... Lift chain 7 ... Pulley bracket 7a ... Vertical plate part as pulley mounting part 7b ... Step part as chain restricting part 7c ... As hose restricting part Upper plate portion 9 ... Pulley support shaft 11 ... Hose pulley 13 ... Hydraulic hose

Claims (2)

[Claims] 1. A lift cylinder is erected between the left and right masts, and the upper part of the cylinder rod of the lift cylinder has:
A forklift hydraulic piping structure provided with a chain wheel support provided with a pair of rotatable left and right chain wheels, comprising a pulley bracket mounted so as to straddle the chain wheel support. The brackets are arranged side by side above and above the chain wheel support, and left and right chain restricting portions that restrict the lift chain mounted on the chain wheel at a constant interval to restrict the lift chain from separating. A plurality of hose pulleys that are rotatably supported by a pulley support shaft and a hydraulic hose that is hooked on the hose pulley face each other at a constant interval to prevent the hydraulic hose from coming off. A hydraulic piping structure for a forklift that is integrally equipped with a hose control unit that operates. 2. A lift cylinder is erected between the left and right masts, and the upper part of the cylinder rod of the lift cylinder has:
A forklift hydraulic piping structure provided with a chain wheel support provided with a pair of rotatable left and right chain wheels, comprising a pulley bracket mounted so as to straddle the chain wheel support. The bracket has a fixed interval between a pulley mounting portion that rotatably supports a plurality of hose pulleys arranged side by side above the chain wheel support via a pulley support shaft and a hydraulic hose that is hooked on the hose pulley. It is integrally provided with a hose restricting part for restricting the disengagement of the hydraulic hose when placed and opposed to each other, and a part of the pulley supporting shaft keeps a constant distance from the lift chain mounted on the chain wheel. Left and right chain restriction parts that restrict the lift chain from leaving by facing it The hydraulic piping structure of a forklift that has been constructed.