JP5024443B2 - Valve operating device for construction machinery - Google Patents

Description

  The present invention relates to a valve operating device having an improved structure for preventing water from entering from a boot covering a valve operating portion of a pilot valve in a construction machine such as a hydraulic excavator.

  The background art will be described taking a traveling pilot valve (also called a remote control valve) of a hydraulic excavator as an example.

  The traveling pilot valve includes a pair of left and right valve portions, and both valve portions are individually operated by separate valve operation portions. This will be described below based on this assumption.

  5-7, 1 is a valve body, 2 is an end cover provided at the opening of the casing 1a of the valve body 1, and 2a is a flange provided in the shape of a bowl on the outer periphery of the end cover 2, The flange 2a is attached to the driver's seat floor 3 as a valve attachment portion with bolts 4. 5 and 6, 5 are bolts for attaching the end cover 2 to the casing 1a.

  In the valve body 1 (casing 1a), a pair of forward and reverse push rods 6 and 6 for both valve portions are provided so as to be slidable up and down through the end cover 2, and the upper surface of the end cover 2 The left and right cam plates 7 are attached to the side so as to be swingable back and forth, and the push rods 6 and 6 are operated via the cam plate 7 by the operation frame 9 operated by the pedal 8 shown in FIG. Then, the valve operation of both valve parts (forward / reverse switching and speed adjustment) is performed. In FIG. 6, reference numeral 10 denotes a ball for operating force transmission interposed between the push rod 6 and the cam plate 7.

  5 and 7, when the lever 11 is attached to the operation frame 9 and the operation frame 9 is operated by the lever 11, or both the pedal 8 and the lever 11 are attached and operated. There is a case.

  As shown in the figure, the valve operating portion of the both valve portions including the end cover 2, the push rods 6 and 6, the cam plate 7 and the ball 10 protrudes above the floor 3 and is exposed to the outside, so that rainwater (canopy-type machine) ) And high-pressure car wash water (both canopy and cabin type machines) must be prevented. In this specification, the entry of water into the valve may be referred to as “immersion”.

  Therefore, the left and right valve operating parts are covered from the outer periphery by bellows-like boots 12 made of a flexible and elastic material such as rubber and having both upper and lower sides opened.

  Conventionally, this boot 12 is attached at both upper and lower ends as follows.

  The upper end portion of the boot 12 is bent to the inner peripheral side and is locked from above to the upper surface of the cam plate 7 (more precisely, a step portion 7a provided at the upper peripheral portion).

  On the other hand, a horizontal attachment seat 9a is provided at the lower end of the operation frame 9, and this attachment seat 9a is attached to the upper surface of the cam plate by bolts 13 and 13 while pressing the upper end portion 12a of the boot from above.

  As a result, the boot upper end 12a is held on the upper surface of the cam plate, and the upper side of the boot is sealed.

  On the other hand, the lower end portion 12b of the boot 12 is fitted from above onto the upper end portion of the valve body 1, that is, the upper portion of the end cover 2, and the boot lower side is sealed by this fitted portion.

  In addition, the convex part 14 which covers the head of the bolt 5 for attaching an end cover protrudes outwardly on both front and rear sides of the boot lower end 12b.

  A valve operating device having basically the same structure as the conventional structure as described above is disclosed in Patent Document 1.

JP-A-9-123789

  However, according to the above-described conventional structure, there is a problem in the sealing performance (infiltration prevention function) of the boot 12.

  That is, since the boot lower end portion 12b relies only on the binding force of the boot 12 itself, the sealing performance is basically insufficient, it is turned up by the high-pressure water from the side, and the upper end portion 12a is easily allowed to be submerged. .

  In particular, the convex portion 14 that covers the head of the bolt 5 is not in close contact with the peripheral surface of the end cover, and a gap is formed between the peripheral surface of the end cover, so that it is easier to open than other portions. There was a lot of flooding from this part.

  For this reason, the push rod 6 and the ball 10 etc. are rusted by the water that has entered the valve body 1, and these parts operate and rub against other parts, so that each part is worn and normal valve operation is impaired. was there.

  Therefore, the present invention provides a valve operating device for a construction machine that can improve the sealing performance of the lower end of the boot and prevent water from entering the valve.

  According to the first aspect of the present invention, the push rod of the valve body is operated via a cam plate by an operating body such as a pedal or a lever, and the valve operating portion including the cam plate is surrounded by a bellows-like boot that is open on both upper and lower sides. In the valve operating device of the construction machine in which the lower end portion of the boot is fitted on the upper end portion of the valve body, convex portions projecting to the outer peripheral side are provided at a plurality of locations in the circumferential direction of the lower end portion of the boot, A lower seal plate having a bowl shape in cross section is attached to the outer periphery of the upper end portion of the valve body in a state where the lower end portion of the boot is pressed onto the upper surface of the valve body through the convex portion.

  According to a second aspect of the present invention, in the configuration of the first aspect, an upper end portion of the boot is bent inward and locked to the upper surface of the cam plate, and an upper seal plate is disposed on the upper surface of the cam plate. It is attached in a state where the upper end is pressed onto the upper surface of the cam plate.

  According to a third aspect of the present invention, in the configuration of the first or second aspect, the valve body includes an end cover at an upper end portion, and a convex portion at a lower end portion of the boot covers a head portion of the bolt for attaching the end cover. It is provided.

  According to a fourth aspect of the present invention, in the configuration of any one of the first to third aspects, a lower end portion of the lower seal plate is bent to the outer peripheral side to form an attachment portion, and the attachment portion is an upper surface of the flange of the valve body. It is attached to the valve mounting part of the machine together with the flange in a state where it is stacked on.

  According to a fifth aspect of the present invention, in the configuration of any one of the first to fourth aspects, the two valve operating portions individually operated by the separate cam plates are respectively covered from the outer periphery by the boots, and the lower seal plate is formed by the two boots. It is attached across the convex part.

  According to the present invention, since the lower end portion of the boot is pressed onto the upper surface of the valve body by the lower seal plate via the convex portion, the opening of the lower end portion of the boot is stopped to prevent a gap from being generated between the upper surface of the valve body. In addition, it is possible to improve the sealing performance under the boot.

  According to the second aspect of the invention, in addition to the above-described configuration, the upper end portion of the boot is pressed against the upper surface of the cam plate by the seal plate, so that the sealability on both the upper and lower sides of the boot can be improved.

  Furthermore, by restraining both the upper and lower ends of the boot together, it is possible to effectively suppress deformation of the entire boot due to high-pressure water or the like from the side, so that the sealability on the upper and lower sides of the boot can be further enhanced.

  According to the invention of claim 3, when the lower seal structure is provided with a convex portion as a portion covering the head of the end cover mounting bolt at the lower end portion of the boot as in the conventional structure illustrated, Since the part can be used as it is as a part of the mounting structure of the lower seal plate, the structure is simple and the cost can be reduced.

  In addition, the convex portion as a portion covering the bolt head is not directly attached to the peripheral surface of the end cover as described above, so that the convex portion is directly pressed downward by the lower seal plate against the problem that the sealing performance is low. This improves the adhesion with the end cover and improves the sealing performance under the boot.

  According to the invention of claim 4, since the lower seal plate can be attached to the valve mounting portion of the machine together with the flange by means of the flange mounting bolt, the structure can be simplified, the number of parts can be reduced and the cost can be reduced. It will be easy. Moreover, since the lower seal plate can be easily attached to and detached from the valve mounting portion (valve body) together with the flange, the boot can be easily deteriorated and replaced when damaged.

  According to the invention of claim 5, in the pilot valve having a pair of valve operating parts like the traveling pilot valve exemplified in the background art, the lower seal plate can be shared by both valve operating parts. It will be advantageous.

It is a partial cross section side view of the valve operating device concerning the embodiment of the present invention. FIG. 2 is a partially enlarged view of FIG. 1. It is a disassembled perspective view of the same apparatus. It is the assembly perspective view. It is a partial cross section side view of the conventional valve | bulb operating device. FIG. 6 is a partially enlarged view of FIG. 5. It is a perspective view of the same apparatus.

  An embodiment of the present invention will be described with reference to FIGS.

  In the embodiment, the traveling pilot valve exemplified in the background art is applied.

In the embodiment,
A. The end cover 2 is attached to the opening of the casing 1a of the valve body 1 with bolts 5 ... and the flange 2a of the end cover 2 is attached to the driver's seat floor 3 (valve attachment portion of the machine) with bolts 4 ... ,
B. In the valve body 1 (casing 1a), a pair of forward and reverse push rods 6 and 6 are provided through the end cover 2 so as to be slidable up and down through the end cover 2 on the left and right sides. A cam plate 7 with separate valve portions is attached to the upper surface side of the cover 2 so as to be able to swing back and forth, and the push rod 6 is interposed via the cam plate 7 and the ball 10 by an operation frame 9 operated by a pedal 8 or a lever 11. , 6 is operated and the valve operation of both valve parts is performed,
C. The valve operation part of both valve parts consisting of the end cover 2, push rods 6, 6, cam plate 7 and ball 10 protrudes above the floor 3 and is exposed to the outside. This valve operation part is flexible and elastic, such as rubber. The point which is covered from the outer periphery separately by the bellows-like boot 12 which the both upper and lower sides which consist of the material which has have both valve parts,
D. The upper end portion 12a of the boot 12 is bent to the inner peripheral side and locked to the upper surface of the cam plate 7 (precisely, the step portion 7a provided on the peripheral portion of the upper surface) from above.
E. The lower end 12b of the boot 12 is fitted on the top of the end cover 2 from above,
F. The structure of the point that the convex part 14 which covers the head of the bolt 5 for attaching the end cover is provided outwardly on both front and rear sides of the boot lower end part 12b is the same as the conventional structure shown in FIGS. It is.

  Based on the above configuration, an upper seal plate 15 is provided at the upper end portion 12a of the boot and a lower seal plate 16 is provided at the lower end portion 12b as means for enhancing the sealing performance of the upper and lower end portions 12a, 12b of the boot 12.

Upper seal plate 15
The upper seal plate 15 is formed in a flat box lid shape by a flat plate-like main portion 15a and side edge portions 15b bent downward at the four peripheral edges of the main portion 15a.

  The upper seal plate 15 is fitted on the upper end portion of the cam plate 7 with the upper end portion 12a of the boot pressed against the upper surface of the cam plate by the main portion 15a and the side surface of the cam plate 7 by the side edge portion 15b.

  The mounting seat 9a of the operation frame 9 is overlaid on the upper seal plate 15, and the mounting seat 9a and the upper seal plate 15 are detachably attached to the cam plate 7 by common bolts 13 and 13.

  3 and 4, 17 and 17 are bolt through holes provided in the upper seal plate 15.

  According to this configuration, the entire upper end portion 12a of the boot can be uniformly pressed onto the upper surface of the cam plate 7 by the upper seal plate 15, so that the upper end portion 12a of the boot can be applied even when lateral pressure is applied by high-pressure water or the like from the side. Opening (turning over) is stopped.

  In addition, since the upper end portion 12a of the boot is also pressed against the side surface of the cam plate by the side edge portion 15b of the upper seal plate 15, the effect of preventing the opening of the upper end portion of the boot is further enhanced.

Lower seal plate 16
The lower seal plate 16 includes a main part 16a having a bowl-shaped cross section, and a pair of attachment parts 16b and 16b that are bent horizontally outward at the lower end of the main part 16a.

  The lower seal plate 16 has the main portion 16a locked from above over the convex portions 14, 14 provided on the lower ends 12a, 12a of the boots 12, 12, and the mounting portions 16b, 16b are end covers. Attached to the driver's seat floor 3 together with the flange 2a of 2 by a bolt 4. The flange 2a is provided with counterbore portions 18 and 18 into which the attachment portions 16b and 16b are fitted (reference numerals are attached only to FIG. 3).

  Thereby, the convex portions 14 and 14 are pressed downward, and the boot lower end portion 12b is pressed onto the upper surface of the end cover (the upper surface of the valve body 1) via the convex portions 14 and 14.

  Accordingly, no gap is generated between the boot lower end portion 12b and the end cover 2, and the opening of the boot lower end portion 12b is suppressed even when a lateral external pressure is applied by high-pressure water or the like from the side.

  Further, the convex portion 14 as a portion covering the head of the end cover mounting bolt 5 has a problem that the sealing performance is low because the adhesion to the peripheral surface of the end cover is weaker than other portions. Can be directly pressed downward by the lower seal plate 16 to improve the adhesion to the end cover 2 and prevent water from entering from this portion.

  In this way, both the upper and lower ends 12a and 12b of the boot can be improved in sealing performance and can prevent water from entering from the upper and lower sides of the boot.

  In addition, this configuration has the following advantages.

  (A) The upper seal plate 15 is attached to the cam plate 7 by the common bolt 13 together with the mounting seat 9a of the operation frame 9, and the lower seal plate 16 is attached to the driver's seat floor 3 by the common bolt 4 together with the flange 2a of the end cover 2. By attaching the projection 14 originally provided on the lower end 12b of the boot as a portion covering the head of the bolt 5 for attaching the end cover, the plates 15 and 16 are respectively attached to the lower seal plate 16 as they are. Compared with the case of mounting on the cam plate 7 or the floor 3 (valve body 1) with a dedicated mounting tool and mounting structure, the plate mounting structure can be simplified, the number of parts can be reduced, the cost can be reduced, and the assembly can be simplified. .

  (B) Since the upper seal plate 15 can be easily attached to and detached from the cam plate 7 and the lower seal plate 16 can be easily attached to and detached from the end cover 2, the boot 12 can be easily deteriorated or replaced when it is damaged.

  (C) In the pilot valve having a pair of valve operation portions like the pilot valve for traveling described in this embodiment, the lower seal plate 16 can be shared by both valve operation portions, which is further advantageous in terms of cost and assembly. Become.

Other Embodiments (1) In the above embodiment, the upper and lower seal plates 15 and 16 are attached to the cam plate 7 or the end cover 2 using the bolts 13 and 4 for attaching the operation frame or the end cover. However, these may be attached to the cam plate 7 or the end cover 2 by a dedicated bolt or attachment means other than the bolt.

  (2) The upper seal plate 15 may be a flat plate shape and the boot upper end portion 12a may be pressed only from above.

  (3) Although it is desirable to provide both the upper and lower seal plates 16 and 17 as in the above embodiment in order to stop the flooding from the upper and lower sides of the boot, only the lower seal plate 17 may be provided.

  (4) The present invention can also be applied to various pilot valves other than the traveling pilot valve mentioned in the embodiment. Further, the present invention is not limited to a pilot valve having two valve portions (valve operating portions), and can be applied to a pilot valve having only one valve portion. In these cases, the valve mounting portion is not limited to the driver's seat floor, and may be an operating console provided on the floor.

DESCRIPTION OF SYMBOLS 1 Valve body 1a Casing 2 End cover 2a Flange 3 Driver's seat floor as valve attachment part 4 Bolt for attaching the flange of the end cover to the driver's floor 5 Bolt for attaching the end cover to the casing 6 Push rod 7 Cam plate 8 Pedal 9 Operation frame 9a Mounting seat 11 Lever 12 Boot 12a Boot upper end portion 12b Boot lower end portion 13 Bolt for attaching the operation frame to the cam plate 14 Convex portion of the lower end portion of the boot 15 Upper seal plate 16 Lower seal plate 16a Main portion of the lower seal plate 16b Same attachment portion

Claims (5)

  The push rod of the valve body is operated by an operating body such as a pedal or a lever through a cam plate, and the valve operating portion including this cam plate is covered from the outer periphery by a bellows-like boot that is open at both the upper and lower sides. In a valve operating device for a construction machine in which a lower end portion is fitted on an upper end portion of a valve body, convex portions projecting to the outer peripheral side are provided at a plurality of locations in a circumferential direction of the lower end portion of the boot, and an outer periphery of the upper end portion of the valve body is provided. A valve operating device for a construction machine, wherein a lower seal plate having a bowl-shaped cross section is attached in a state in which the lower end portion of the boot is pressed onto the upper surface of the valve main body through the convex portion.   The upper end of the boot is bent inward and locked to the upper surface of the cam plate, and the upper seal plate is attached to the upper surface of the cam plate in a state of pressing the upper end of the boot onto the upper surface of the cam plate. The valve operating device for a construction machine according to claim 1.   The construction according to claim 1 or 2, wherein the valve body includes an end cover at an upper end portion, and a convex portion at a lower end portion of the boot is provided as a portion covering a head portion of the bolt for attaching the end cover. Mechanical valve operating device.   The lower seal plate has its lower end bent to the outer peripheral side to form a mounting portion, and this mounting portion is attached to the valve mounting portion of the machine together with the flange in a state of being superimposed on the upper surface of the flange of the valve body. The valve operating device for a construction machine according to any one of claims 1 to 3.   5. Two valve operation portions that are individually operated by different cam plates are respectively covered from the outer periphery by boots, and the lower seal plate is mounted across the convex portions of both boots. The valve operating device for a construction machine according to any one of the above.

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