JP4438803B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine including a fire barrier that shields a hydraulic pump and pump piping from a heat generating portion including an engine.

  The background art will be described using a hydraulic excavator as an example.

  The hydraulic excavator is configured such that an upper swing body is mounted on a crawler type lower traveling body so as to be rotatable about a vertical axis, and a work (excavation) attachment is mounted on the upper swing body.

  The upper swing body of the hydraulic excavator is configured by mounting various facilities on the upper frame 1 shown in FIG. Among these, the engine 2 as a power source and the hydraulic pump 3 driven by the engine 2 are mounted on the rear portion of the upper frame. 4 is a cooling fan.

  Here, in order to prevent the hydraulic oil leaked from the hydraulic pump 3 and the pump pipe from being scattered and ignited to the heat generating portion such as the engine 2 or a muffler (not shown), the hydraulic pump 3 and the pump are also shown in FIG. A fire wall 5 is provided to shield the piping from the heat generating portion.

  Conventionally, the fire wall 5 is attached to the upper frame 1 as shown.

  On the other hand, the pressure oil discharged from the hydraulic pump 3 causes a pressure pulsation due to a change in flow rate, etc., and this hydraulic pulsation is transmitted to the pump piping to generate vibration and noise. Branch piping (shown here for two cases) 6 and 6 is connected to 3.

  The ends of the branch pipes 6 and 6 are closed, and the pump discharge oil is reflected at the closed ends of the branch pipes 6 and 6 to return to the pump side, and merges with the oil in the pump pipes to cancel hydraulic pulsation. Attenuate.

Conventionally, the ends of the branch pipes 6 and 6 are fixed to a pipe fixing member 7 dedicated to the branch pipe provided in the upper frame 1 as shown (see Patent Document 1).
JP-A-8-296788

  In the prior art, since the fire wall 5 is attached to the upper frame 1 belonging to a vibration system different from the engine vibration system as described above, the fire wall 5 and the hydraulic pump 3 belonging to the engine vibration system are operated during machine operation. And do separate vibrations. For this reason, it was necessary to ensure a relatively large gap between the fire wall 5 and the outer periphery of the hydraulic pump 3 for preventing interference.

  For this reason, there is a problem that the shielding function is not fulfilled in the gap portion and the fire prevention performance becomes insufficient.

  In addition, since a dedicated pipe fixing member 7 for fixing the branch pipes 6 and 6 must be provided in the upper frame 1, the number of parts increases, the parts cost and the assembly cost increase, and the space around the engine is small. However, it is disadvantageous in terms of piping and the like because it is narrowed by the piping fixing member 7.

  Furthermore, in order to fix the branch pipes 6 and 6 belonging to the engine vibration system to the pipe fixing member 7 of the upper frame 1 belonging to another vibration system, it is necessary to take measures to prevent these interferences. It was disadvantageous.

  Therefore, the present invention provides a construction machine that can solve the above problems all at once and eliminate the gap between the fire wall and the outer periphery of the hydraulic pump to improve the shielding effect, while simplifying the structure for fixing the branch pipe. To do.

  According to the first aspect of the present invention, an engine and a hydraulic pump driven by the engine are mounted on the frame of the machine, and a fire barrier that shields the hydraulic pump and pump piping from a heat generating portion including the engine is provided. In a construction machine in which a branch pipe for reducing hydraulic pulsation generated in a discharge side pipe of the pump is connected to the hydraulic pump, a pump side firewall is attached to the hydraulic pump as the fire barrier, and the branch The front end of the pipe is fixed to the pump side fire wall.

  According to a second aspect of the present invention, in the configuration of the first aspect, a fire wall separate from the pump side fire wall is attached to the engine or the upper frame.

  According to a third aspect of the present invention, in the configuration of the first or second aspect, a bracket is provided on the pump side fire wall, while a flange is provided on the outer periphery of the branch pipe, and the flange is pressed and fixed to the bracket by a flange presser. As a result, the tip opening of the branch pipe is closed, and at the same time, the tip of the pipe is fixed to the pump-side fire wall.

  According to the present invention, since the fire wall (pump side fire wall) is attached to the hydraulic pump, the pump side fire wall and the pump belong to the same vibration system, so that a gap for preventing interference is secured between them. There is no need. For this reason, the shielding effect of the pump and pump piping with respect to a heat-emitting portion can be enhanced.

  Also, paying attention to the fact that the pump-side firewall is close to the pump and that the pump-side firewall has a sufficient area, the tip of the branch pipe is fixed here. A dedicated pipe fixing member can be omitted. In addition, by attaching a branch pipe of the same vibration system to the pump side fire wall, it is not necessary to take measures to prevent interference between the branch pipe and the fire wall at the pipe fixing portion.

  In these respects, the structure for fixing the branch pipe can be simplified, the number of parts can be reduced, the parts cost and the assembly cost can be reduced, and the space around the engine can be expanded, which is advantageous in terms of piping and the like.

  In this case, according to the invention of claim 2, by arranging the fire barrier separately on the pump side and the separate one, the two fire walls are arranged in a positional relationship that exhibits optimum fire performance. can do.

  Further, according to the invention of claim 3, since the branch pipe is fixed and the tip seal is performed at the same time, the fixing and sealing structure of the pipe is simplified, the number of parts is reduced, the assembly is facilitated, and the cost is thereby reduced. Down can be realized.

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

  Here, a hydraulic excavator is illustrated as an application target in accordance with the description of the background art.

  The engine 2 and the hydraulic pump 3 are mounted on the rear part of the upper frame 1 (only the main part is shown), and a fire wall for shielding the hydraulic pump 3 and the pump piping from the heat generation part including the engine 2 is provided.

  As this fire barrier, the upper frame 1 is provided with an upper frame side fire barrier 11 that shields between the heat generating portion and the hydraulic pump 3 on the rear side of the pump via an attachment member (not shown).

  The upper frame side fire wall 11 may be attached to the engine 2 via an attachment member at the same position to serve as the engine side fire wall.

  On the other hand, on the lower surface of the hydraulic pump 3 (more precisely, the pump housing), a pump side fire wall 12 that shields between the heat generating portion and the hydraulic pump 3 at the front lower portion is attached.

  The pump-side firewall 12 is attached directly or via an attachment member (not shown) along the curved lower surface of the hydraulic pump 3 and with no gap formed between the pump-side firewall 12 and the lower surface of the pump.

  Since the fire wall (pump side fire wall) 12 is attached to the hydraulic pump 3 in this way, the pump side fire wall 12 and the hydraulic pump 3 belong to the same vibration system, as described above and illustrated. In addition, it is not necessary to secure a gap for preventing interference between the two.

  Thereby, since leakage oil can be reliably prevented from entering the heat generating portion from the gap, the shielding (fireproof) performance can be significantly improved.

  Further, since the fire wall is provided separately for the upper frame side fire wall 11 and the pump side fire wall 12, both the fire walls 11, 12 can be arranged in a positional relationship that exhibits optimum fire performance.

  On the other hand, branch pipes (here, two cases are illustrated) 13 and 13 are connected to the discharge port of the hydraulic pump 3 for reducing the pulsation of the hydraulic pressure generated in the pump pipe. The tip portions of 13 and 13 are fixed to the pump-side fire wall 12 via brackets 14 and 14.

  This piping fixing structure will be described in detail with reference to FIG.

  The brackets 14 and 14 are formed in an L shape including a fire wall mounting portion 14 a and a pipe fixing portion 14 b, and the fire wall mounting portion 14 a is bolted to the pump side fire wall 12.

  At the tip of the branch pipe 13, a flange 13 a that protrudes to the outer peripheral side and a flange presser 15 that is fitted to the outer periphery of the flange 13 a are provided. The flange presser 15 connects the flange 13 a to the pipe fixing portion 14 b of the bracket 14. Is bolted to the pipe fixing portion 14b in a state of being pressed against one side (hereinafter referred to as a sealing surface) 14c.

  Thereby, the front-end | tip (flange 13a) of the branch piping 13 is pressed against the sealing surface 14c of the piping fixing | fixed part 14b, and the same piping 13 is fixed in the state by which the front-end | tip opening was obstruct | occluded oil-tightly by the sealing surface 14c.

  As described above, since the branch pipes 13 and 13 are fixed and sealed at the tip (blocking) at the same time, the mounting and sealing structure of the pipes 13 and 13 are simplified, the number of parts is reduced, and the assembly is easy. And cost reduction can be realized.

  In this case, the length of the branch pipes 13 and 13 can be shortened because the pump-side fire wall 12 which is a fixing destination of the branch pipes 13 and 13 is attached to the position near the hydraulic pump 3 on the lower surface of the pump. Further, since the fire wall 12 has a sufficiently large area from the original function of shielding between the heat generating portion and the hydraulic pump 3 and the pump pipe, the ends of the branch pipes 13 and 13 can be easily fixed. it can.

  In other words, paying attention to the position and area of the pump side fire wall 12, the fire wall 12 is also used as a fixing point for the branch pipes 13 and 13.

  In this way, the pipe fixing member dedicated to fixing the pipe that has been conventionally attached to the upper frame can be omitted. For this reason, the number of parts can be reduced to reduce the parts cost and assembly cost, and the space around the engine can be expanded, which is advantageous in terms of piping and the like.

  Moreover, by fixing the branch pipes 13 and 13 having the same vibration system to the pump-side fire wall 12, it is not necessary to take measures against vibrations at the pipe fixing portion. For this reason, the structure can be further simplified and the cost can be reduced.

  Furthermore, since the mounting positions of the brackets 14 and 14 can be freely selected and changed using the wide area of the pump-side fire wall 12, the length adjustment of the branch pipes 13 and 13 is facilitated.

Other Embodiments (1) In the above embodiment, the fire wall is divided into the upper frame side (or engine side) fire wall 11 and the pump side fire wall 12, but these are integrally attached to the hydraulic pump 3. Also good. That is, you may comprise a fire wall only with the pump side fire wall 12. FIG.

  (2) In the above-described embodiment, the branch pipes 13 and 13 are fixed and the tips are sealed (blocked) at the same time. However, these configurations are separately performed, that is, the end openings of the branch pipes 13 and 13 are plugged. A configuration may be adopted in which the pipes 13 and 13 are fixed to the pump-side fire wall 12 at the tip end in a state where the body is closed.

It is the perspective view which looked at the upper frame of the hydraulic shovel which concerns on embodiment of this invention from the lower surface side. It is the same side view. FIG. 2 is a partially enlarged view of FIG. 1. FIG. 3 is a partially enlarged view of FIG. 2. It is an expanded sectional view of the tip fixed part of branch piping in an embodiment. It is a top view of the upper frame of a hydraulic excavator. It is a rear view which shows the conventional fire prevention structure and the fixing structure of branch piping.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper frame 2 Engine 3 Hydraulic pump 11 Upper frame side fire wall 12 Pump side fire wall 13, 13 Branch piping 13a Branch piping flange 14 Branch piping fixing bracket 14a Bracket against fire wall mounting portion 14b Same piping fixing portion 14c Same sealing surface 15 Flange presser

Claims (3)

  An engine and a hydraulic pump driven by the engine are mounted on the frame of the machine, and a fire wall is provided to shield the hydraulic pump and pump piping from a heat generating part including the engine. In a construction machine to which a branch pipe for reducing hydraulic pulsation generated in a pump discharge side pipe is connected, a pump side fire wall is attached to the hydraulic pump as the fire barrier, and the tip of the branch pipe is the pump. A construction machine that is fixed to the side fire wall.   The construction machine according to claim 1, wherein a fire wall separate from the pump side fire wall is attached to the engine or the upper frame.   While a bracket is provided on the pump side fire wall, a flange is provided on the outer periphery of the branch pipe, and this flange is pressed against and fixed to the bracket by a flange holder, so that the opening of the branch pipe is simultaneously closed. The construction machine according to claim 1 or 2, wherein the pipe tip is fixed to the pump side fire wall.

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