Hydraulic unit

Abstract

To provide a hydraulic unit equipped with a hose hanger that is easy to handle and suitable for the purpose of on-site work and truck transportation.SOLUTION: A hose hanger 17 has a base member 22 attached to an upper part of a side surface of a bonnet of a hydraulic unit, an arm member 24 rotatably connected to the base member via a first pivot pin 19 and equipped with a hanging jig attachment portion 23 at its pivot end, and a link member 26 rotatably connected to the arm member via a second pivot pin 20 and equipped with a pin hole 25 for fixing during work at its pivot end through which a fixing pin 21 for connecting to the base member can be inserted and removed, and is configured to be movable between a working position in which the arm member is supported by the link member and deployed outside the side surface of the bonnet with the fixing pin inserted in the pin hole for fixing during work, and a transport position in which the arm member and link member hang down integrally from the side surface of the bonnet with the fixing pin removed from the pin hole for fixing during work.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a hydraulic unit, and more particularly to a hydraulic unit for supplying hydraulic pressure to a hydraulic working device. [Background technology]

[0002] Portable hydraulic units, which house a hydraulic pump and the engine that drives it inside a bonnet (also called a housing, casing, etc.), are used as a power source for various hydraulic working devices such as pile drivers and tubing devices at construction sites, and are particularly essential for operating tubing devices that do not have their own power generating means (see, for example, Patent Document 1). Among such separately installed hydraulic units, there are known ones that are equipped with a lifting device that prevents the hydraulic hose from coming into a grounded state in order to protect the hydraulic hose that extends to the oil destination (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-179603 A [Patent Document 2] JP 2012-52298 A Summary of the Invention [Problem to be solved by the invention]

[0004] The hydraulic hose lifting device described in Patent Document 2 is a boom type device that can rotate, extend, and reel in the lifting rope, and can adjust the lifting position of the hydraulic hose to follow the movement of the pile driver. On the other hand, in a non-self-propelled tubing device, the hydraulic hose is not required to have a tracking ability, but since it is necessary to prevent excessive bending and compression near the hose connection part, a simple lifting means called a hose hanger has been used conventionally.

[0005] Specifically, as shown in FIG. 13, after installing a hydraulic unit 100 at a predetermined position on-site, a hose hanger 101 equipped with an arm 101a is attached to a top plate 102a of a bonnet 102, and a bundle of connected hydraulic hoses 104 is lifted up as a unit by a belt 105 by winding up a lifting jig (chain block) 103 attached to the tip of the arm 101a.

[0006] However, since the hose hanger 101 protrudes outward from the side of the bonnet 102 when attached to the hydraulic unit 100, when the hydraulic unit 100 is moved to a different site by truck, the hose hanger must be removed in advance and then reinstalled at the next site, which is a cumbersome procedure.

[0007] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a hydraulic unit equipped with a hose hanger that is easy to handle and suitable for field work and truck transport. [Means for solving the problem]

[0008] In order to achieve the above object, the hydraulic unit of the present invention houses a hydraulic pump that supplies hydraulic pressure to a hydraulic working device and an engine that drives the hydraulic pump within a rectangular parallelepiped bonnet, and is provided on a side of the bonnet with a hose connection portion to which a hydraulic hose is connected and a hose hanger to which a hanging jig for the hydraulic hose is attached, the hose hanger comprising a base member attached to an upper portion of a side surface of the bonnet, and an arm that is rotatably connected to the base member via a first pivot pin and has a hanging jig attachment portion at a pivot end. The bonnet mounting apparatus has a member and a link member that is rotatably connected to the arm member via a second pivot pin and has at its pivot end a pin hole for fixation during work, into which a fixing pin for connecting to the base member can be inserted and removed, and is configured to be movable between a working position in which the arm member is supported by the link member and deployed outside the side of the bonnet with the fixing pin inserted into the pin hole for fixation during work, and a transport position in which the arm member and the link member hang down integrally from the side of the bonnet with the fixing pin removed from the pin hole for fixation during work.

[0009] The arm member is characterized in that it has a transport fixing pin hole which replaces the work fixing pin hole at the transport position and into which the fixing pin can be inserted and removed.

[0010] The arm member has a U-shaped cross section and is provided with a protruding member that is interposed between the link member and the bonnet in the transport position and restricts the link member from swinging toward the bonnet. Effect of the Invention

[0011] According to the hydraulic unit of the present invention, the hose hanger, which serves as a hanging means for the hydraulic hose, comprises a base member attached to the upper part of the side surface of the bonnet, an arm member rotatably connected to the base member via a first pivot pin, and a link member rotatably connected to the arm member via a second pivot pin, and the pivot end of the link member is provided with a pin hole for fixing during work into which a fixing pin for connecting to the base member can be inserted and removed.Therefore, with the simple operation of inserting and removing the fixing pin, the hose hanger can be moved, while maintaining the integrity of each of its members, between a working position where it is deployed on the outside of the side surface of the bonnet and a transport position where it hangs down from the side surface of the bonnet, thereby achieving a hydraulic unit equipped with a hose hanger that is easy to handle and suitable for the purposes of field work and truck transport. [Brief description of the drawings]

[0012] [Figure 1] 1 is a diagram showing a state in which a hydraulic unit according to an embodiment of the present invention is used; [Diagram 2] FIG. 11 is a front view of the hose hanger in a state where it has been moved to the working position. [Diagram 3] This is also a side view. [Figure 4] FIG. [Diagram 5] FIG. 4 is a cross-sectional view of FIG. [Figure 6] 6 is a cross-sectional view taken along line VI-VI of FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. [Figure 8] FIG. 11 is a side view of the hose hanger in a state where it has been moved to the transport position. [Figure 9] FIG. 11 is an explanatory diagram showing the state in which the fixing pin has been removed from the fixing pin hole during operation. [Figure 10] FIG. 11 is an explanatory diagram showing a state in which the arm member is rotated about a first rotation pin and the link member is rotated about a second rotation pin. [Figure 11] FIG. 11 is an explanatory view showing a state in which the arm member and the link member are rotated integrally about the first rotation pin while rotation of the link member about the second rotation pin is restricted. [Figure 12] FIG. 13 is an explanatory view showing how the fixing pin is inserted into the fixing pin hole during transportation to restrict the rotation of the arm member. [Figure 13] FIG. 1 is a diagram showing a state in which a conventional hydraulic unit is used. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] 1 to 12 show an embodiment of the hydraulic unit of the present invention. As shown in Fig. 1, the hydraulic unit 11 shown in this embodiment accommodates various devices such as a hydraulic pump that supplies hydraulic pressure to a tubing device 13, which is an example of a hydraulic working device, an engine that drives the hydraulic pump, and a hydraulic oil tank that stores hydraulic oil, inside a rectangular parallelepiped bonnet 12 with a soundproof structure, and the front (one side) of the bonnet 12 is provided with a control panel 14, a hose connection part 16 for connecting a plurality of hydraulic hoses 15 for oil supply, a hose hanger 17 as a hanging means for the hydraulic hose 15, and an attached hanging jig 18.

[0014] Hose connection part 16 and hose hanger 17 are arranged so that they are in a vertical positional relationship when viewed facing directly at the front of bonnet 12 (Fig. 1). The lifting jig 18 employs a well-known chain block 103 shown in the conventional configuration of Fig. 13, and its arrangement, that is, the lifting point of hydraulic hose 15, which is the object to be lifted (the position where it is suspended by belt 105), is set at a position equivalent to that of the conventional configuration.

[0015] The hose hanger 17 is interchangeable with and replaces the conventional hose hanger 101 of the same type, and has a three-section link support structure that forms an approximately right-angled triangle when deployed horizontally for use (Figs. 2 to 4), with three joints (nodes) formed from plate material and pipe material (round pipe) connected by pins 19, 20, and 21, respectively.

[0016] As shown in FIGS. 2 to 8, the specific configuration of the hose hanger 17 includes a base member 22 attached to the upper part of the side surface (front surface shown in FIG. 1) 12a of the bonnet 12, an arm member 24 rotatably connected to the base member 22 via a first pivot pin 19 and equipped with a hanging jig attachment portion 23 at a pivot end (tip portion), and an arm member 24 rotatably connected to the arm member 24 via a second pivot pin 20 and equipped with a fixing pin 21 for connecting to the base member 22 at the pivot end (tip portion). It has a link member 26 with a removable pin hole 25 for fixing during work, and is configured to be movable between a work position (Figure 3) in which the arm member 24 is supported horizontally by the link member 26 and deployed outside the side surface 12a of the bonnet 12 with the fixing pin 21 inserted into the pin hole 25 for fixing during work, and a transport position (Figure 8) in which the arm member 24 and link member 26 are hung down integrally from the side surface 12a of the bonnet 12 with the fixing pin 21 removed from the pin hole 25 for fixing during work.

[0017] The base member 22 mainly has a mounting plate 27 having an L-shaped cross section, which is made up of a horizontal plate that contacts the upper surface (top surface) 12b of the bonnet 12 and a vertical plate that hangs down from its end along the side surface 12a of the bonnet, and a pair of left and right ribs 28, 28 protruding from the outer surface of the mounting plate 27. The mounting plate 27 is attached to the side that contacts the upper surface (top surface) 12b of the bonnet 12 by four bolts 29, with its inner surface abutting against the upper corners of the bonnet 12.

[0018] The pair of left and right ribs 28, 28 are formed of a single plate with a horizontal portion 28a extending horizontally along the top surface 12b of the bonnet 12 and a vertical portion 28b extending vertically along the side surface 12a of the bonnet 12, and upper and lower pin holes 30, 31 are provided in the vertical portion 28b for passing the first pivot pin 19 and the fixed pin 21 (FIG. 5). The arrangement of the pin holes 30, 31 spaced apart from each other in the vertical direction sets a vertical inter-pin distance (distance between pin centers) L1 between the first pivot pin 19 and the fixed pin 21. A reinforcing plate 32 is provided immediately above the first pivot pin 19 to increase the rigidity of the ribs 28, 28.

[0019] The arm member 24 has two bar members 33, 33 arranged facing each other with their plate surfaces upright, and pin holes 34, 35 for passing the first and second pivot pins 19, 20 therethrough (FIGS. 5 and 6). A pipe member 36 is provided between the base ends (pivot bases) of the bar members 33, 33 corresponding to the first pin hole 34, and furthermore, a hanging jig attachment part 23 made of, for example, a round bar is provided at the tip end (pivot end) on the opposite side, in a manner that it is placed on the bar members 33, 33.

[0020] A reinforcing plate 37 is provided over the range from the longitudinal middle of the arm member 24 to the tip (hanging jig attachment portion 23), including the region corresponding to the position of the second pivot pin 20, i.e., the region immediately above the second pivot pin 20, and the reinforcing plate 37 integrated with the hanging jig attachment portion 23 and the two bar members 33, 33 form a U-shaped cross section that is open downward (FIG. 6). As shown in FIG. 4, the reinforcing plate 37 has a notch 37a formed by removing the connection portion with the hanging jig attachment portion 23, which improves the fit of the hanging hook (not shown) engaged with the hanging jig attachment portion 23.

[0021] A transport fixation pin hole 38 is provided in the longitudinal middle of the arm member 24, which replaces the work fixation pin hole 25 of the link member 26 at the transport position and into which the fixation pin 21 can be inserted and removed. In other words, the transport fixation pin hole 38 is provided such that the longitudinal distance from the first pivot pin 19 sets the inter-pin distance L2 equal to the vertical inter-pin distance L1 (the inter-pin distance between the first pivot pin 19 and the fixation pin 21) (FIG. 7). A pipe material 39 is separately provided between the bar materials 33, 33 corresponding to the transport fixation pin hole 38, with a configuration similar to that of the base end (rotation base) side.

[0022] The link member 26 has two bar materials 40, 40 arranged opposite to each other in the same manner as the arm member 24, and the bar materials 40, 40 are provided with a pin hole 41 through which the second pivot pin 20 passes (FIG. 6). A pipe material 42 is provided between the base end portions (pivot base portions) of the bar materials 40, 40 corresponding to the pin hole 41, and further, at the tip end portion (pivot end portion) on the opposite side, a pin hole for fixing during work 25 is provided by, for example, inserting a pipe material 43 into a pilot hole provided in the two bar materials 40, 40 and welding and fixing it thereto (FIG. 5).

[0023] Furthermore, a protruding member 44 made of, for example, a round pipe is provided at the longitudinal intermediate portion of the link member 26 by being placed on the bar materials 40, 40. The protruding member 44 is interposed between the link member 26 and the bonnet 12 in the transport position (FIG. 8) and minimizes the gap S formed in this state, thereby restricting the swinging of the link member 26 towards the bonnet 12, that is, the swinging of the link member 26 inwards (vibration / rattle).

[0024] The following describes how to handle the hose hanger 17 when it is moved from the working position (Fig. 3) to the transport position (Fig. 8) with reference to Figs. 9 to 12, focusing particularly on the movements of the arm member 24 and the link member 26. Note that the work of moving the hose hanger 17 uses a work platform (for example, a step stool) as necessary, and is basically a one-person job, but it is also possible for it to be performed by two people with an assistant.

[0025] First, the tip of the arm member 24 is supported to reduce the frictional force (sliding resistance) occurring between the fixing pin 21 and the pin hole 31 of the base member 22, and the fixing pin 21 is removed from the pin hole 25 for fixing during work, as shown in Fig. 9. Next, as shown in Fig. 10, the arm member 24 is rotated downward (in the direction of arrow A) about the first pivot pin 19 while the link member 26 is rotated downward (in the direction of arrow B) about the second pivot pin 20, and the angle between the arm member 24 and the link member 26 increases. At this time, as can be imagined from Fig. 3, the pin hole 38 for fixing during transportation, which has a rotation radius of length L2, moves in an arc around the first pivot pin 19 in accordance with the downward rotation of the arm member 24.

[0026] The arm member 24 and link member 26 continue to rotate, but when the base end side of the link member 26 is housed inside the U-shaped cross section of the arm member 24, as shown in Figure 11, only the rotation of the link member 26 about the second pivot pin 20 is restricted and both members 24, 26 extend in a substantially straight line while maintaining an inclination with respect to the ground. Note that the intermediate position as shown in Figure 11 differs depending on the support mode of the hose hanger 17. For example, when only the arm member 24 is placed in a supported state, the link member 26 is placed in a hanging state under its own weight without inclining with respect to the ground.

[0027] Here, since the two inter-pin distances L1, L2 set based on the position of the first pivot pin 19 are equal, when the tip of the arm member 24 is rotated to a position facing vertically downward, the pin hole 38 for fixing during transportation is positioned in a state where it coincides with the pin hole 31 of the base member 22, as shown in Fig. 12. That is, the pin hole 25 for fixing during operation that existed in the working position is replaced by the pin hole 38 for fixing during transportation. Then, when the fixing pin 21 is inserted into the pin holes 31, 38 that communicate with each other, the rotation of the arm member 24 around the first pivot pin 19 is restricted.

[0028] In this transport position of the hose hanger 17 (FIG. 8), the weights of the arm member 24 and the link member 26 act to create a stationary and stable state in which they hang down integrally from the side surface 12a of the bonnet 12. The hydraulic unit 11, whose mountability is ensured in this way, is hung from the bed of a transport truck and fits within the dimensions of the bed (transport width).

[0029] Here, even if vibrations or the like act on the hydraulic unit 11 on the bed of the transport truck, the arm member 24, which is fixed by the fixing pin 21, will not swing outward, and the outward swing of the link member 26 is suppressed by the U-shaped cross section of the arm member 24, while the opposite swing inward (towards the bonnet 12) is suppressed by the protruding member 44, eliminating the problem of the link member 26 swinging like a pendulum around the second pivot pin 20.

[0030] In this way, when the hydraulic unit 11 is transported to the next site, the hose hanger 17 is deployed in the reverse order of the above to place the hydraulic hose 15 in a suspended state, and the engine is started to enable the hydraulic pump to perform its hydraulic pressure supply function.

[0031] As described above, according to the hydraulic unit 11 of the present invention, the hose hanger 17 serving as the hanging means for the hydraulic hose 15 comprises the base member 22 attached to the upper part of the side surface of the bonnet 12, the arm member 24 rotatably connected to the base member 22 via the first pivot pin 19, and the link member 26 rotatably connected to the arm member 24 via the second pivot pin 20, and the pivot end of the link member 26 is provided with a pin hole 25 for fixing during work into which the fixing pin 21 for connecting to the base member 22 can be inserted and removed. Therefore, by the simple operation of inserting and removing the fixing pin 21, the hose hanger 17 can be moved, while maintaining the integrity of its respective members 22, 24, 26, to a work position (FIG. 3) in which it is deployed outside the side surface 12a of the bonnet 12 and a transport position (FIG. 8) in which it hangs down from the side surface 12a of the bonnet 12, and a hydraulic unit 11 equipped with a hose hanger 17 that is easy to handle and suitable for the purposes of field work and truck transport is achieved.

[0032] In addition, the arm member 24 has a transport fixing pin hole 38 which replaces the work fixing pin hole 25 in the transport position and into which the fixing pin 21 can be inserted and removed, so that the work fixing pin hole 25 and the transport fixing pin hole 38 can be selectively used for one pin hole 31 in a fixed position (Figs. 9 and 12), improving the working conditions for pin operation. Moreover, because the vertical inter-pin distance L1 is set, the pin holes 31 and 38 can be easily made coaxial when the members 24 and 26 are hanging down due to their own weight (transport position), making it even easier to insert and remove the fixing pin 21 (Fig. 12).

[0033] Furthermore, because the arm member 24 has a U-shaped cross section, the rigidity of the arm member 24 is increased in the working position where the hanging load acts, while the outward swing of the link member 26 is suppressed in the transport position, resulting in a highly practical arm member 24. In addition, because the protruding member 44 is provided in the transport position, which is interposed between the link member 26 and the bonnet 12 and restricts the swing of the link member 26 towards the bonnet 12, the inward swing of the link member 26 is suppressed, and furthermore, the problem of the swing width of the link member 26 increasing due to interaction with the above-mentioned U-shaped cross section can be eliminated.

[0034] The present invention is not limited to the above-mentioned embodiment, and the structure and arrangement of the hose hanger can be changed as appropriate without impairing the function of lifting the hydraulic hose. For example, the shape and size of the triangle (three-section link) formed by connecting the first and second pivot pins and the fixed pin can be changed as necessary, and reinforcement can be added as desired. In addition, the protruding member may be a commercially available rubber pad, which can be attached to the side of the bonnet. Furthermore, although a tubing device has been described as an example of a hydraulic working device, other working devices may be used, and the present invention may be applicable to self-propelled construction machines such as pile drivers, earth drills, and cranes. [Explanation of symbols]

[0035] Reference Signs List 11...hydraulic unit, 12...bonnet, 12a...side, 12b...top, 13...tubing device, 14...control panel, 15...hydraulic hose, 16...hose connection part, 17...hose hanger, 18...suspension jig, 19...first pivot pin, 20...second pivot pin, 21...fixing pin, 22...base member, 23...suspension jig attachment part, 24...arm member, 25...fixing pin during work Hole, 26... link member, 27... mounting plate, 28... rib, 28a... horizontal portion, 28b... vertical portion, 29... bolt, 30, 31... pin hole, 32... reinforcing plate, 33... bar material, 34, 35... pin hole, 36... pipe material, 37... reinforcing plate, 37a... notch portion, 38... pin hole for fixing during transportation, 39... pipe material, 40... bar material, 41... pin hole, 42, 43... pipe material, 44... protruding member

Claims

1. A hydraulic unit includes a hydraulic pump that supplies hydraulic pressure to a hydraulic working device and an engine that drives the hydraulic pump, the hydraulic pump being housed within a rectangular parallelepiped bonnet, and the bonnet is provided on a side thereof with a hose connection portion to which a hydraulic hose is connected, and a hose hanger to which a hanging jig for the hydraulic hose is attached, the hose hanger comprises a base member attached to the upper part of a side surface of the bonnet, an arm member rotatably connected to the base member via a first pivot pin and having a hanging jig mounting portion at its pivot end, and a link member rotatably connected to the arm member via a second pivot pin and having a pin hole for fixing during work at its pivot end through which a fixing pin for connecting to the base member can be inserted and removed, and is configured to be movable between a working position in which the arm member is supported by the link member and deployed outside the side surface of the bonnet with the fixing pin inserted in the pin hole for fixing during work, and a transport position in which the arm member and the link member hang down together from the side surface of the bonnet with the fixing pin removed from the pin hole for fixing during work.

2. 2. The hydraulic unit according to claim 1, wherein the arm member is provided with a transport fixing pin hole which replaces the work fixing pin hole at the transport position and into which the fixing pin can be inserted and removed.

3. 3. The hydraulic unit according to claim 2, wherein the arm member has a U-shaped cross section.

4. 4. The hydraulic unit according to claim 1, further comprising a protruding member that is interposed between the link member and the bonnet in the transport position and restricts the link member from swinging toward the bonnet.

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