JP2005344395A - Construction equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide construction equipment which can suppress the overflow of a surplus sealing agent from a sealing agent application area defined by a mounting surface formed on an upper revolving body and a mounting surface formed on a housing of a revolving device. <P>SOLUTION: The sealing agent application area 43 for sealing the periphery of a pinion insertion hole 13 formed in a revolving frame 8 is defined by the frame-side mounting surface 14 formed on the revolving frame 8 and the housing-side mounting surface 24 formed on the housing 22 of the revolving device 21, and the frame-side mounting surface 14 has an entire peripheral groove 44 formed thereon for accommodating the surplus sealing agent 43A overflowing the sealing agent application area 43. Thus even if the surplus sealing agent 43A overflows the sealing agent application area 43, it is trapped in the entire peripheral groove 44, and therefore the flowing of the surplus sealing agent 43A into bolt holes 15 screwed in the frame-side mounting surface 14 and bolt insertion holes 25 formed in the housing-side mounting surface 24 can be suppressed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a construction machine including a turning device for turning an upper turning body on a lower traveling body such as a hydraulic excavator or a hydraulic crane.

  In general, a construction machine such as a hydraulic excavator or a hydraulic crane has a self-propelled lower traveling body, a turning wheel provided at a turning center position of the lower traveling body, and turns on the lower traveling body through the turning wheel. The upper revolving body provided in a possible manner and a revolving device that is provided in the upper revolving body and revolves the upper revolving body via a revolving wheel.

  Then, the turning device is provided in the housing that is attached to the upper turning body at a position corresponding to the turning wheel, a speed reducer that is provided in the housing and decelerates rotation of the rotation source, and is provided in the upper turning body. A pinion that is inserted into the pinion insertion hole and transmits the rotation decelerated by the speed reducer to the turning wheel is formed (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 4-89150

  Here, the housing of the swivel device according to the prior art described above is usually attached using a plurality of bolts to an attachment surface formed on the swivel frame surrounding the pinion insertion hole, and the pinion of the swivel device is attached to the swivel frame. It is configured to extend downward through the drilled pinion insertion hole and mesh with the internal teeth of the swivel wheel attached to the lower surface side of the swivel frame.

  Then, the turning device decelerates the rotation of the hydraulic motor by the speed reducer, and transmits the rotation decelerated by the speed reducer to the pinion, thereby rotating the pinion with a large torque. As a result, the pinion revolves along the inner teeth while meshing with the inner teeth of the turning wheel (inner ring), and this pinion revolving force is transmitted to the turning frame through the housing, so that the upper turning body is moved onto the lower traveling body. Can be swiveled.

  By the way, if rain water, washing water, etc. enter between the mounting surface formed on the swivel frame and the mounting surface formed on the housing of the swivel device, the rain water and the like are attached to the mounting surface on the swivel frame side and the mounting side on the housing side. It flows into the pinion insertion hole of the swivel frame from between the surfaces, and flows through the pinion insertion hole into a grease bath that stores grease that lubricates the meshing portion between the pinion and the inner teeth of the swirl ring. When rainwater or the like stays in the grease bath, there is a problem that the life of the pinion, the inner teeth, and the like is reduced due to the rainwater and the life thereof is reduced.

  For this reason, in the prior art, a sealing agent is applied between the mounting surface on the swivel frame side and the mounting surface on the housing side so as to surround the pinion insertion hole from the outer peripheral side, and this sealant surrounds the pinion insertion hole. Is sealed in a liquid-tight manner.

  However, in the prior art, the mounting surface on the swivel frame side and the mounting surface on the housing side are connected to each other in a state where a sealant is annularly applied to one of the mounting surface on the swivel frame side and the mounting surface on the housing side. By abutting, a sealing agent is applied annularly between the swivel frame and the mounting surface of the housing.

  For this reason, when the sealing agent is pressed between the mounting surface on the swivel frame side and the mounting surface on the housing side, the sealing agent overflowing from both mounting surfaces seems to adhere to the bolts that attach the housing to the swivel frame. become. And when a sealing agent adheres to a volt | bolt etc., when removing a turning apparatus from a turning frame by maintenance operation | work, there exists a problem that a volt | bolt etc. will be damaged.

  The present invention has been made in view of the above-described problems of the prior art. When a sealant application portion is provided between an attachment surface formed on the upper swing body and an attachment surface formed on the housing of the swing device, It is an object of the present invention to provide a construction machine capable of suppressing overflow of excess sealing agent from a sealing agent application part.

  In order to solve the above-described problems, the present invention provides a self-propelled lower traveling body, a turning wheel provided at a turning center position of the lower traveling body, and a turn on the lower traveling body via the turning wheel. An upper revolving body provided on the upper revolving body and a revolving device for revolving the upper revolving body via a revolving wheel. The revolving device collides with the upper revolving body at a position corresponding to the revolving wheel. Mounted on the housing, a speed reducer provided in the housing for reducing the rotation of the rotation source, and a pinion that is inserted into a pinion insertion hole provided in the upper swing body and transmits the rotation reduced by the speed reducer to the swirling wheel It is applied to a construction machine comprising

  The feature of the configuration adopted by the invention of claim 1 is that the pinion is inserted between the mounting surface that surrounds the pinion insertion hole and is formed on the upper swing body and the mounting surface that is formed on the housing of the swing device. A sealant application part to which a sealant that seals the periphery of the hole in a liquid-tight manner is applied, and a sealant-accommodating recess that accommodates excess sealant overflowing from the sealant application part are provided.

  According to the second aspect of the present invention, the mounting surface formed in the upper swing body surrounds the pinion insertion hole and is provided with a plurality of bolt holes, and the mounting surface formed in the housing of the swing device corresponds to each bolt hole. A plurality of bolt insertion holes are provided, and the sealant accommodating recess is configured as an annular circumferential groove that surrounds each bolt hole formed in the upper swing body from the outer peripheral side, and the sealant application part is an outer periphery of the entire circumferential groove. The configuration is such that the ring is provided on the side.

  According to a third aspect of the present invention, the mounting surface formed on the upper swing body surrounds the pinion insertion hole and is provided with a plurality of bolt holes, and the mounting surface formed on the housing of the swing device corresponds to each bolt hole. A plurality of bolt insertion holes are provided, and the sealant-receiving recess is configured as an annular circumferential groove that surrounds each bolt insertion hole formed in the housing of the swivel device from the outer peripheral side. It is that it was set as the structure provided cyclically | annularly on the outer peripheral side.

  In the invention of claim 4, the mounting surface formed on the upper swing body is provided with a reinforcing plate for reinforcing the periphery of the pinion insertion hole and to which the housing of the swing device is mounted. The present invention is configured to be provided between the reinforcing plate and the mounting surface formed on the housing of the swivel device.

  According to a fifth aspect of the present invention, the upper revolving structure includes a revolving frame that forms a support structure by a bottom plate and a vertical plate extending in front and rear of the bottom plate, and the bottom plate of the revolving frame has a revolving wheel on its lower surface side. The swivel device housing is mounted on the upper surface side, and a pinion insertion hole through which the swivel pinion is inserted is provided, and the pinion insertion hole is surrounded between the bottom plate of the swivel frame and the swivel device housing. The present invention has a configuration in which a sealant application part and a sealant accommodating recess are provided.

  According to the first aspect of the present invention, in the state where the mounting surface formed on the housing of the swivel device is abutted with the mounting surface formed on the upper swing body surrounding the pinion insertion hole, the sealant is interposed between the two. Since the application part is formed, the periphery of the pinion insertion hole provided in the upper swing body can be sealed in a liquid-tight manner by the sealant application part. As a result, it is possible to prevent rainwater, washing water, and the like from adhering to the pinion and the internal teeth of the swivel ring through the pinion insertion hole, so that the life of the pinion and the internal teeth of the swivel ring can be extended. Further, excess sealant that protrudes from the sealant application part is captured by a sealant-receiving recess provided between the mounting surface formed on the upper swing body and the mounting surface formed on the housing of the swivel device. be able to.

  According to the second aspect of the present invention, the sealant-containing recess is configured as an entire circumferential groove formed on the mounting surface on the upper swing body side, and a plurality of bolt holes provided on the mounting surface on the upper swing body side are provided with the entire circumferential groove. Therefore, it is possible to suppress the surplus sealing agent from flowing into the bolt hole by capturing the excess sealing agent overflowing from the sealing agent application portion in the entire circumferential groove. . Thereby, it can prevent that a sealing agent adheres to the bolt for attaching the housing of a turning apparatus to an upper turning body, and can securely attach a turning apparatus to an upper turning body using a volt | bolt.

  According to invention of Claim 3, a sealing agent accommodation recessed part is comprised as an all-around groove formed in the attachment surface of the housing of a turning apparatus, and the some bolt insertion hole provided in the attachment surface of the housing is made into this all-around groove. Therefore, it is possible to prevent the excess sealing agent from flowing into the bolt insertion hole by capturing the excess sealing agent overflowing from the sealing agent application portion in the entire circumferential groove. It is possible to prevent the sealant from adhering to the bolt for attaching the housing of the swing device to the upper swing body.

  According to the invention of claim 4, when the sealant application part is formed between the reinforcing plate provided on the upper swing body and the mounting surface formed on the housing of the swivel device, the surplus from the sealant application part is formed. Even if the sealant overflows, the surplus sealant can be captured by the sealant-receiving recess provided between the reinforcing plate and the mounting surface on the housing side.

  According to the invention of claim 5, the periphery of the pinion insertion hole provided in the bottom plate of the revolving frame constituting the upper revolving structure is liquidated by the sealant application portion provided between the bottom plate of the revolving frame and the housing of the revolving device. The sealant can be tightly sealed, and excess sealant overflowing from the sealant application portion can be captured by the sealant-receiving recess.

  Hereinafter, an embodiment of a construction machine according to the present invention will be described in detail with reference to FIGS. 1 to 16, taking a hydraulic excavator as an example.

  First, FIG. 1 to FIG. 7 show a first embodiment of the present invention. The feature of this embodiment is that an attachment surface formed on an upper swing body and an attachment surface formed on a housing of a swing device. A sealant application part and a sealant container are provided between them.

  In the figure, reference numeral 1 denotes a hydraulic excavator. The hydraulic excavator 1 includes a crawler-type lower traveling body 2 capable of self-propelling, a later-described revolving wheel 16 provided at a turning center position of the lower traveling body 2, and the swivel The upper revolving unit 3 is pivotally mounted on the lower traveling unit 2 via a wheel 16 so that the excavation work or the like can be lifted up and down on the front side of the upper revolving unit 3. Is provided.

  The upper swing body 3 has a swing frame 8 which will be described later. On the swing frame 8, a cab 5 that defines a driver's cab, and equipment (not shown) such as an engine and a hydraulic pump are provided. A building cover 6 to be accommodated and a counterweight 7 that balances the weight of the working device 4 are provided.

  Reference numeral 8 denotes a revolving frame that forms a support structure for the upper revolving structure 3, and the revolving frame 8 is located at the center in the left and right directions and extends in the front and rear directions as shown in FIG. , Which protrude from the center frame 9 in the left and right directions, and are fixed to the protruding ends of the respective extension beams 10, and are positioned on both the left and right sides of the center frame 9 in front. The left and right side frames 11 and 12 extending rearward are roughly configured to form a strong support structure.

  Here, the center frame 9 has a bottom plate 9A formed in a flat plate shape using a thick steel plate or the like, and a left plate which is erected on the upper surface of the bottom plate 9A by means of welding or the like and extends in the front and rear directions. , Right vertical plates 9B and 9C, and the bottom surface side of the bottom plate 9A is configured to be attached to an outer ring 16B of a turning wheel 16 described later.

  Reference numeral 13 denotes a pinion insertion hole formed in the bottom plate 9A constituting the center frame 9, and the pinion insertion hole 13 is inserted with a pinion 41 of the turning device 21 described later. In this case, the pinion insertion hole 13 is disposed at a position where the pinion 41 and an inner tooth 16D of the swivel wheel 16 described later mesh.

  14 is a frame-side mounting surface formed on the upper swing body 3 (the bottom plate 9A of the swing frame 8) surrounding the pinion insertion hole 13, and the frame-side mounting surface 14 is formed on the bottom plate 9A as shown in FIG. By grinding the upper surface in an annular shape, it is formed as an annular flat surface arranged concentrically with the pinion insertion hole 13. The frame-side mounting surface 14 is formed with an all-around groove 44 described later.

  Reference numeral 15 denotes a bolt hole formed by a plurality of female screw holes screwed to the frame side mounting surface 14. Each bolt hole 15 surrounds the outer peripheral side of the pinion insertion hole 13 and is arranged in an annular shape. Through the top and bottom. Each bolt hole 15 is for receiving a bolt 26 described later.

  Reference numeral 16 denotes a turning wheel provided at a turning center position of the lower traveling body 2, and the turning wheel 16 supports the upper traveling body 3 so as to be turnable with respect to the lower traveling body 2. Then, as shown in FIG. 3, the turning wheel 16 includes an inner ring 16 </ b> A fixed to the circular body 2 </ b> A constituting the lower traveling body 2, and an outer wheel 16 </ b> B attached to the lower surface side of the bottom plate 9 </ b> A constituting the turning frame 8. A plurality of steel balls 16C (only one is shown) disposed between the inner ring 16A and the outer ring 16B, and an inner tooth 16D is formed on the inner circumference side of the inner ring 16A over the entire circumference. Yes.

  Reference numeral 21 denotes a turning device provided on the upper surface side of the bottom plate 9 </ b> A constituting the turning frame 8, and the turning device 21 turns the upper turning body 3 on the lower traveling body 2 via the turning wheel 16. The turning device 21 includes a housing 22, a hydraulic motor 27, planetary gear speed reducers 28 and 33, an output shaft 38, a pinion 41, and the like which will be described later.

  Reference numeral 22 denotes a housing that forms an outer shell of the swivel device 21, and the housing 22 is abutted against the frame side mounting surface 14 of the swivel frame 8 at a position corresponding to the inner teeth 16 </ b> D of the swivel wheel 16. . The housing 22 is composed of a stepped cylindrical lower housing 22A and a cylindrical upper housing 22B fixed on the lower housing 22A with a bolt 23, and the inner peripheral side of the upper housing 22B. The inner teeth 22 </ b> C that mesh with planetary gears 30 and 35 described later are formed over the entire circumference.

  22D is an annular mounting flange provided on the lower end side of the lower housing 22A, and the mounting flange 22D is attached to the bottom plate 9A of the revolving frame 8. Here, on the lower surface side of the mounting flange 22D, an annular projection 22E that fits into the pinion insertion hole 13 formed in the bottom plate 9A is formed.

  Reference numeral 24 denotes a housing side mounting surface formed on the lower surface side of the housing 22 (mounting flange 22D). As shown in FIG. 5, the housing side mounting surface 24 is located on the lower surface side of the mounting flange 22D more than the protrusion 22E. It is formed as an annular flat surface by grinding the outer peripheral side. The housing-side mounting surface 24 is mounted so as to abut against the frame-side mounting surface 14 formed on the bottom plate 9 </ b> A of the revolving frame 8.

  Reference numeral 25 denotes a plurality of bolt insertion holes drilled in the housing side mounting surface 24. Each bolt insertion hole 25 is annularly arranged corresponding to each bolt hole 15 screwed into the frame side mounting surface 14. It penetrates the housing side mounting surface 24 upward and downward. The housing 22 is mounted on the frame side mounting surface 14 by screwing the bolts 26 inserted into the bolt insertion holes 25 into the bolt holes 15 of the frame side mounting surface 14.

  Reference numeral 27 denotes a hydraulic motor serving as a rotation source of the turning device 21, and the hydraulic motor 27 is constituted by, for example, a swash plate type hydraulic motor, and is attached to the upper end side of the upper housing 22 </ b> B constituting the housing 22. A rotating shaft 27 </ b> A of the hydraulic motor 27 protrudes into the housing 22 and meshes with a sun gear 29 described later.

  Reference numeral 28 denotes a first-stage planetary gear speed reducer provided in the housing 22, and the planetary gear speed reducer 28 is a sun gear 29 that meshes with a rotating shaft 27 A of the hydraulic motor 27 (spline connection), and the sun gear 29. A plurality of planetary gears 30 (only one is shown) that mesh with the inner teeth 22C of the housing 22 and revolve around the sun gear 29, and a plurality of pins that rotatably support the planetary gears 30. 31A (only one is shown), and a carrier 31 that transmits only the revolution of each planetary gear 30 to a sun gear 34, which will be described later, and the planetary gear 30 provided on the upper end side of each pin 31A are retained in the axial direction. This is generally constituted by a disc-shaped retaining plate 32.

  33 is a second stage planetary gear reducer provided in the housing 22 below the planetary gear reducer 28. The planetary gear reducer 33 is splined to the carrier 31 of the planetary gear reducer 28. A plurality of planetary gears 35 (one piece) that mesh with the sun gear 34 to which the revolving force of the planetary gear 30 is transmitted and the sun gear 34 and the inner teeth 22C of the housing 22 and revolve while rotating around the sun gear 34. And a carrier 36 having a plurality of pins 36A (only one is shown) for rotatably supporting the planetary gears 35, and transmitting only the revolution of each planetary gear 35 to an output shaft 38 to be described later. A disc-shaped retaining plate 37 provided on the upper end side of each pin 36A and retaining the planetary gear 35 in the axial direction is roughly constituted.

  An output shaft 38 is supported by the upper and lower bearings 39 and 40 and is rotatably provided in the housing 22. The output shaft 38 is splined to the carrier 36 of the planetary gear reducer 33 at the upper end side. Yes.

  Reference numeral 41 denotes a pinion integrally provided on the lower end side of the output shaft 38. The pinion 41 is inserted into the pinion insertion hole 13 from the lower end side of the housing 22, and through the pinion insertion hole 13, the revolving frame 8 (bottom plate 9A). It projects to the lower surface side and meshes with the internal teeth 16D of the turning wheel 16 (inner ring 16A).

  Then, the turning device 21 decelerates the rotation of the hydraulic motor 27 by two stages by the planetary gear speed reducers 28 and 33 and transmits it to the output shaft 38, and rotates the pinion 41 provided on the output shaft 38 with a large torque. Then, the pinion 41 revolves along the inner ring 16A while meshing with the inner teeth 16D provided on the inner ring 16A of the turning wheel 16, and the revolution force of the pinion 41 is transmitted to the turning frame 8 via the housing 22, whereby the upper portion The revolving structure 3 is configured to revolve on the lower traveling structure 2.

  42 is an annular grease bath located below the inner teeth 16D of the swivel wheel 16 and provided on the inner peripheral side of the round cylinder 2A. The grease bath 42 is a round cylinder using means such as welding. It is attached to the inner peripheral surface of 2A. The grease bath 42 stores grease (not shown) that lubricates the meshing portion between the internal teeth 16D of the swivel wheel 16 and the pinion 41 of the swivel device 21.

  43 is a sealant application portion provided in an annular shape between the frame side mounting surface 14 formed on the swivel frame 8 and the housing side mounting surface 24 formed on the housing 22 of the swivel device 21. 43 is a site | part to which the sealing compound for liquid sealing is apply | coated between each attachment surface 14 and 24. As shown in FIG.

  Here, as shown in FIGS. 3 and 4, the sealant application part 43 is formed in an annular shape so as to surround the pinion insertion hole 13 of the revolving frame 8 from the outer peripheral side. The sealant application part 43 liquid-tightly seals the periphery of the pinion insertion hole 13 between the frame-side mounting surface 14 and the housing-side mounting surface 24, and rainwater, washing water, etc. are attached to each mounting surface 14, 24. It is prevented from flowing into the pinion insertion hole 13 side through the gap therebetween.

  Here, for example, as shown in FIG. 5 to FIG. 7, the sealant application unit 43 annularly applies a silicon-based liquid sealant 43 </ b> A called liquid packing onto the frame side mounting surface 14 of the swivel frame 8. In this state, the housing-side mounting surface 24 of the housing 22 is brought into contact with the frame-side mounting surface 14 to be pressed between the frame-side mounting surface 14 and the housing-side mounting surface 24, and the outer periphery of an all-round groove 44 described later. It is formed in a thin annular shape on the side.

  Reference numeral 44 denotes an entire circumferential groove as a sealant accommodating recess provided in the frame side mounting surface 14 of the revolving frame 8, and the entire circumferential groove 44 is annularly arranged on the frame side mounting surface 14 as shown in FIG. 4. Each of the bolt holes 15 is formed of a continuous annular concave groove surrounding the outer peripheral side, and is formed concentrically with the pinion insertion hole 13.

  The entire circumferential groove 44 captures an excess sealant 43A overflowing from the sealant application part 43 when the sealant application part 43 is formed between the frame side attachment surface 14 and the housing side attachment surface 24. The surplus sealant 43A is prevented from flowing into the bolt hole 15 and the bolt insertion hole 25.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. The hydraulic excavator 1 self-travels to the work site by the lower traveling body 2 and then swings the upper swinging body 3 by the swinging device 21. The work device 4 is used to perform excavation work of earth and sand.

  Here, when excavation work is performed using the excavator 1 in the rain or when the excavator 1 is washed, rainwater and washing water fall on the bottom plate 9A of the swivel frame 8, and the rainwater is swirled. It tries to enter the pinion insertion hole 13 side of the swivel frame 8 through the space between the frame side mounting surface 14 formed on the frame 8 and the housing side mounting surface 24 formed on the housing 22 of the swivel device 21.

  However, since the annular sealant application part 43 is provided over the entire circumference between the frame side mounting surface 14 and the housing side mounting surface 24, rainwater or the like enters the pinion insertion hole 13 side. Can be reliably prevented by the sealant application part 43. As a result, rainwater or the like can be prevented from flowing into the grease bath 42 through the pinion insertion hole 13, the bolt hole 15, etc., and the life of the pinion 41, the internal teeth 16 </ b> D of the swivel wheel 16, etc. can be extended.

  Moreover, the hydraulic excavator 1 according to the present embodiment is configured such that the entire circumferential groove 44 is formed on the frame side mounting surface 14 formed on the revolving frame 8 by surrounding each bolt hole 15 from the outer peripheral side.

  As a result, even when excess sealant 43A overflows from the sealant application part 43 when the sealant application part 43 is formed between the frame side attachment surface 14 and the housing side attachment surface 24, the excess sealant. The agent 43 </ b> A can be captured in the entire circumferential groove 44. In this way, the entire circumferential groove 44 exhibits a dam effect that captures and stores the excess sealant 43A overflowing from the sealant application part 43, so that the excess sealant 43A is attached to the frame side of the revolving frame 8. The bolt holes 15 screwed into the surface 14 and the bolt insertion holes 25 drilled in the housing-side mounting surface 24 of the turning device 21 can be prevented from flowing.

  This prevents the seal agent 43A from adhering to the bolts 26 that fasten the housing 22 of the swivel device 21 to the frame-side mounting surface 14 of the swivel frame 8, and when the swivel device 21 is removed from the swivel frame 8 during maintenance work. Since the bolt 26 can be prevented from being damaged, maintenance work and the like of the turning device 21 can be easily performed.

  Next, FIG. 8 and FIG. 9 show a second embodiment of the present invention, and the feature of this embodiment is that a sealant accommodating recess is provided on the mounting surface formed on the housing of the swivel device. . In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 51 denotes an entire circumferential groove as a sealant accommodating recess provided in the housing side mounting surface 24 formed in the lower housing 22A of the housing 22, and the entire circumferential groove 51 is formed in the housing side mounting surface 24. It is formed as a continuous annular concave groove that surrounds each bolt insertion hole 25 provided from the outer peripheral side.

  The circumferential groove 51 overflows from the sealant application part 43 when the sealant application part 43 is formed between the frame side attachment surface 14 of the revolving frame 8 and the housing side attachment surface 24 of the housing 22. The surplus sealing agent 43A is accommodated.

  The hydraulic excavator according to the present embodiment is provided with a circumferential groove 51 that surrounds each bolt insertion hole 25 from the outer peripheral side on the housing side mounting surface 24 formed in the housing 22, and a seal is provided in the circumferential groove 51. By capturing the excess sealant 43A overflowing from the agent application part 43, the excess sealant 43A is screwed into the frame side mounting surface 14 and each bolt hole 15 is drilled into the housing side mounting surface 24. Flowing into the insertion hole 25 can be suppressed.

  Next, FIGS. 10 and 11 show a third embodiment of the present invention. The feature of the present embodiment is that the mounting surface formed on the upper swing body and the mounting surface formed on the housing of the swing device are as follows. Both are provided with a sealant accommodating recess. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 52 denotes an entire circumferential groove as a sealant accommodating recess provided in the housing side mounting surface 24 formed in the lower housing 22A of the housing 22, and the entire circumferential groove 52 is formed in the housing side mounting surface 24. It is formed as a continuous annular concave groove that surrounds each bolt insertion hole 25 provided from the outer peripheral side.

  The circumferential groove 52 has the same diameter as the circumferential groove 44 of the frame-side mounting surface 14 and is concentrically formed with the circumferential groove 44. Therefore, as shown in FIG. 11, when the frame-side mounting surface 14 and the housing-side mounting surface 24 are brought into contact with each other, the entire circumferential groove 44 and the entire circumferential groove 52 are integrated into one piece in the upward and downward directions. The annular groove is configured.

  Thus, when the sealant application part 43 is formed between the frame side attachment surface 14 and the housing side attachment surface 24, the excess sealant 43A overflowing from the sealant application part 43 is removed from the frame side attachment surface 14. The circumferential groove 44 provided on the housing side and the circumferential groove 52 provided on the housing side mounting surface 24 can be reliably accommodated in a large accommodation space.

  The hydraulic excavator according to the present embodiment is provided with a circumferential groove 44 on the frame side mounting surface 14 formed on the revolving frame 8 and a circumferential groove 52 on the housing side mounting surface 24 formed on the housing 22. The basic operation is not particularly different from that according to the first embodiment described above.

  However, according to the present embodiment, a large accommodation space can be secured by the entire circumferential groove 44 provided in the frame side mounting surface 14 and the entire circumferential groove 52 provided in the housing side mounting surface 24, so that the sealing agent The surplus sealing agent 43A overflowing from the application portion 43 can be almost completely captured by the entire circumferential groove 44 and the entire circumferential groove 52, and each surplus sealing agent 43A is screwed to the frame side mounting surface 14. It is possible to reliably suppress the bolt holes 15 and the bolt insertion holes 25 formed in the housing side mounting surface 24 from flowing into the bolt holes 15.

  Next, FIG. 12 and FIG. 13 show a fourth embodiment of the present invention. The feature of this embodiment is that a reinforcing plate that reinforces the periphery of the pinion insertion hole is provided on the mounting surface formed on the upper swing body. And providing a sealant application part and a sealant accommodating recess between the reinforcing plate and the mounting surface formed on the housing of the swivel device. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 61 denotes a revolving frame used in this embodiment instead of the revolving frame 8 according to the first embodiment. The revolving frame 61 is an upper revolving body of a small hydraulic excavator called a mini excavator (see FIG. (Not shown) of the support structure.

  Here, the swivel frame 61 is a bottom plate 61A formed in a flat plate shape using a thick steel plate or the like, and a vertical plate extending in the front and rear directions by being erected on the upper surface of the bottom plate 61A by means of welding or the like. And a plate (not shown). The lower surface side of the bottom plate 61A is attached to the outer ring 16B of the turning wheel 16.

  Reference numeral 62 denotes a pinion insertion hole formed in the bottom plate 61A constituting the turning frame 61, and the pinion insertion hole 62 is inserted with a pinion 71 of the turning device 66 described later. In this case, the pinion insertion hole 62 is disposed at a position where the pinion 71 meshes with the internal teeth 16 </ b> D of the swivel wheel 16.

  Reference numeral 63 denotes a frame-side attachment surface formed on the turning frame 61 so as to surround the pinion insertion hole 62, and the frame-side attachment surface 63 is attached with a turning device 66 via a reinforcing plate 64 described later.

  A reinforcing plate 64 surrounds the pinion insertion hole 62 and is fixed to the frame side mounting surface 63. The reinforcing plate 64 reinforces the periphery of the pinion insertion hole 62 and a housing 72 to be described later. Is. Here, the reinforcing plate 64 is formed in an annular shape using a steel plate material or the like, and an inner peripheral side thereof is a fitting hole portion 64A into which a protruding portion 72E of the housing 72 described later is fitted. The reinforcing plate 64 is fixed to the frame-side mounting surface 63 by means such as welding in a state where the fitting hole portion 64A is disposed concentrically with the pinion insertion hole 62. The reinforcing plate 64 is formed with a circumferential groove 78 described later.

  Reference numeral 65 denotes a bolt hole formed by a plurality of (only one shown) female screw holes screwed to the frame side mounting surface 63 and the reinforcing plate 64, and each bolt hole 65 surrounds the outer peripheral side of the pinion insertion hole 62. And is arranged in an annular shape and penetrates the frame side mounting surface 63 and the reinforcing plate 64 upward and downward. Each bolt hole 65 is for receiving a bolt 76 described later.

  Reference numeral 66 denotes a turning device provided in the turning frame 61. The turning device 66 is substantially the same as the turning device 21 according to the first embodiment described above, and will be described later with a housing 72, a hydraulic motor 67, and a planetary gear speed reducer 68. 69, an output shaft 70, a pinion 71, and the like.

  Then, the turning device 66 decelerates the rotation of the hydraulic motor 67 by two stages by the planetary gear speed reducers 68 and 69 and transmits it to the output shaft 70, and rotates the pinion 71 provided on the output shaft 70 with a large torque. Then, the pinion 71 revolves along the inner ring 16A while meshing with the inner teeth 16D provided on the inner ring 16A of the turning wheel 16, and the revolution force of the pinion 71 is transmitted to the turning frame 61 via the housing 72, thereby turning. The frame 61 is turned.

  Reference numeral 72 denotes a housing that forms an outer shell of the swivel device 66. The housing 72 includes a lower housing 72A and an upper housing 72B fixed on the lower housing 72A with a bolt 73, and the upper housing 72B. On the inner circumference side, inner teeth 72C that mesh with the planetary gears of the planetary gear speed reducers 68 and 69 are formed over the entire circumference. An annular mounting flange 72D that is attached to the reinforcing plate 64 of the revolving frame 61 is provided on the lower end side of the lower housing 72A, and a fitting hole portion 64A of the reinforcing plate 64 is provided on the lower surface side of the mounting flange 72D. An annular projecting portion 72E that fits in is formed.

  Reference numeral 74 denotes a housing side mounting surface formed on the lower surface side of the housing 72 (mounting flange 72D). The housing side mounting surface 74 is an annular shape located on the outer peripheral side of the protrusion 72E on the lower surface side of the mounting flange 72D. It is formed as a flat surface. The housing side attachment surface 74 is attached to a reinforcement plate 64 provided on the frame side attachment surface 63 of the revolving frame 61.

  Reference numeral 75 denotes a plurality of bolt insertion holes (only one is shown) formed in the housing side mounting surface 74, and each bolt insertion hole 75 has an annular shape corresponding to each bolt hole 65 screwed into the reinforcing plate 64. And penetrates the housing side mounting surface 74 upward and downward. The housing 72 is mounted on the reinforcing plate 64 by screwing the bolts 76 inserted into the respective bolt insertion holes 75 into the bolt holes 65.

  Reference numeral 77 denotes a sealant application part provided between the reinforcing plate 64 and the housing side mounting surface 74 of the housing 72. The sealant application part 77 surrounds the pinion insertion hole 62 of the swivel frame 61 from the outer peripheral side. It is formed in an annular shape. Then, the sealant application part 77 liquid-tightly seals the periphery of the pinion insertion hole 62 between the reinforcing plate 64 and the housing side mounting surface 74, and rainwater, washing water, etc. flow into the pinion insertion hole 62 side. Is to prevent.

  Here, like the sealant application part 43 according to the first embodiment, the sealant application part 77 is in a state in which a liquid sealant 77A called liquid packing is applied on the reinforcing plate 64 in an annular shape. By abutting the housing-side mounting surface 74 of the housing 72 against the reinforcing plate 64, it is pressed between the reinforcing plate 64 and the housing-side mounting surface 74, and is formed in a thin annular shape on the outer peripheral side of the entire circumferential groove 78 described later. Is.

  Reference numeral 78 denotes an entire circumferential groove provided as a sealant-containing recess provided in the reinforcing plate 64. The entire circumferential groove 78 surrounds each bolt hole 65 disposed annularly in the reinforcing plate 64 from the outer peripheral side. It consists of a concave groove and is formed concentrically with the pinion insertion hole 62. The entire circumferential groove 78 accommodates the excess sealant 77A overflowing from the sealant application part 77 when the sealant application part 77 is formed between the reinforcing plate 64 and the housing side mounting surface 74. It is.

  The present embodiment has the above-described configuration, and when the sealant application part 77 is formed between the reinforcing plate 64 and the housing-side mounting surface 74, an excessive sealant 77A is removed from the sealant application part 77. Even if it overflows, the excess sealant 77A is captured in the entire circumferential groove 78, so that the excess sealant 77A is drilled in each bolt hole 65 and the housing side mounting surface 74 screwed to the reinforcing plate 64 or the like. It can suppress flowing into each bolt insertion hole 75 provided.

  This prevents the sealant 77A from adhering to the bolt 76 that fastens the housing 72 of the swivel device 66 to the reinforcing plate 64 of the swivel frame 61, and the bolt 76 when the swivel device 66 is removed from the reinforcing plate 64 during maintenance work. Therefore, it is possible to easily perform maintenance work or the like of the swivel device 66.

  In the above-described fourth embodiment, the case where the entire circumferential groove 78 is provided only in the reinforcing plate 64 of the reinforcing plate 64 and the housing-side mounting surface 74 that abut each other is illustrated. However, the present invention is not limited to this. For example, as in the modification shown in FIG. 14, the entire circumferential groove 79 may be provided only in the housing side mounting surface 74. Moreover, it is good also as a structure which provides a circumferential groove in both the reinforcement board 64 and the housing side attachment surface 74. FIG.

  Further, in the third embodiment described above, the case where the circumferential groove 52 having the same diameter as the circumferential groove 44 provided on the frame side mounting surface 14 is provided on the housing side mounting surface 24 is illustrated. .

  However, the present invention is not limited to this. For example, as in the modification shown in FIG. 15, the circumferential groove 52 having a diameter slightly larger than the diameter of the circumferential groove 44 on the housing side mounting surface 24. ′ May be provided so that the inner circumferential side of the circumferential groove 52 ′ and the outer circumferential side of the circumferential groove 44 communicate in the upward and downward directions.

  Further, for example, as in another modification shown in FIG. 16, a large-diameter circumferential groove 52 ″ surrounding the circumferential groove 44 from the outer peripheral side may be provided on the housing side mounting surface 24.

  Furthermore, in each embodiment mentioned above, although the hydraulic excavator 1 was illustrated as a construction machine, this invention is not restricted to this, For example, the turning apparatus which turns an upper turning body on lower traveling bodies, such as a hydraulic crane, was provided. Can be widely applied to construction machinery.

1 is a front view showing a hydraulic excavator to which a first embodiment of the present invention is applied. It is a top view which shows the turning frame in FIG. 1 alone. It is sectional drawing which shows the turning flame | frame by 1st Embodiment, a turning apparatus, a perimeter groove | channel, etc. FIG. It is sectional drawing which looked at the frame side attachment surface, the sealing agent application part, the all-around groove | channel, etc. from the arrow IV-IV direction in FIG. It is sectional drawing which shows the state which abuts a frame side mounting surface and a housing side mounting surface. It is a principal part expanded sectional view which shows the state which abuts a frame side attachment surface and a housing side attachment surface, and forms a sealant application part between both. It is a principal part expanded sectional view which shows the state which caught the excess sealing agent in the perimeter groove | channel when the frame side mounting surface and the housing side mounting surface abutted. FIG. 6 is a cross-sectional view similar to FIG. 5 showing a state in which the frame side mounting surface and the housing side mounting surface are brought into contact with each other according to the second embodiment. It is the bottom view of the housing which looked at the housing side attachment surface and all the circumference grooves from the arrow IX-IX direction in FIG. It is sectional drawing similar to FIG. 5 which shows the state which makes the frame side attachment surface and housing side attachment surface by 3rd Embodiment abut. It is a principal part expanded sectional view which shows the state which caught the excess sealing agent in the perimeter groove | channel when the frame side mounting surface and housing side mounting surface by 3rd Embodiment collide. It is sectional drawing which shows the turning frame by 4th Embodiment, a reinforcement board, a turning apparatus, a perimeter groove | channel, etc. It is sectional drawing which shows the state which abuts the reinforcement board by 4th Embodiment, and a housing side attachment surface. It is a principal part expanded sectional view similar to FIG. 13 which shows the modification of 4th Embodiment. It is a principal part expanded sectional view similar to FIG. 11 which shows the modification of 3rd Embodiment. FIG. 12 is an enlarged cross-sectional view of a main part similar to FIG. 11 showing another modification of the third embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Lower traveling body 3 Upper revolving body 8,61 Turning frame 13,62 Pinion insertion hole 14,63 Frame side attachment surface 15,65 Bolt hole 16 Turning wheel 16D Internal tooth 21,66 Turning device 22,72 Housing 24,74 Housing Side mounting surface 25, 75 Bolt insertion hole 27, 67 Hydraulic motor (rotation source)
28, 33, 68, 69 Planetary gear reducer 41, 71 Pinion 43, 77 Sealing agent application part 43A, 77A Sealing agent 44, 51, 52, 52 ', 52 ", 78, 79 Grooves around all sides (sealing agent accommodating recess) )
64 Reinforcement plate

Claims (5)

A self-propelled lower traveling body, a turning wheel provided at a turning center position of the lower traveling body, an upper revolving body provided on the lower traveling body via the turning wheel so as to be turnable, and the upper part A turning device provided on a turning body for turning the upper turning body via the turning wheel;
The turning device includes a housing that is attached to the upper turning body at a position corresponding to the turning wheel, a speed reducer that is provided in the housing and decelerates rotation of a rotation source, and is provided on the upper turning body. In a construction machine comprising a pinion that is inserted into the pinion insertion hole that is transmitted and transmits the rotation decelerated by the speed reducer to the swivel wheel,
A seal that surrounds the pinion insertion hole in a liquid-tight manner between an attachment surface that surrounds the pinion insertion hole and is formed on the upper revolving body and an attachment surface that is formed on the housing of the swivel device. A construction machine comprising: a sealant application part to which an agent is applied; and a sealant-accommodating recess for accommodating an excess sealant overflowing from the sealant application part. The mounting surface formed on the upper swing body has a plurality of bolt holes surrounding the pinion insertion hole, and the mounting surface formed on the housing of the swing device has a plurality of bolts corresponding to the bolt holes. An insertion hole,
The sealant-containing recess is configured as an annular all-around groove that surrounds each bolt hole formed in the upper swing body from the outer peripheral side,
The construction machine according to claim 1, wherein the sealant application part is configured to be provided annularly on an outer peripheral side of the entire circumferential groove. The mounting surface formed on the upper swing body has a plurality of bolt holes surrounding the pinion insertion hole, and the mounting surface formed on the housing of the swing device has a plurality of bolts corresponding to the bolt holes. An insertion hole,
The sealant accommodating recess is configured as an annular circumferential groove that surrounds each bolt insertion hole formed in the housing of the swivel device from the outer peripheral side,
The construction machine according to claim 1 or 2, wherein the sealant application part is configured to be provided annularly on an outer peripheral side of the entire circumferential groove. The mounting surface formed on the upper swing body is provided with a reinforcing plate for reinforcing the periphery of the pinion insertion hole and mounting the housing of the swing device.
The construction machine according to claim 1 or 3, wherein the sealant application part and the sealant accommodating recess are provided between the reinforcing plate and a mounting surface formed on a housing of the swivel device. The upper revolving structure includes a revolving frame that forms a support structure with a bottom plate and a vertical plate extending in front of and behind the bottom plate,
The bottom plate of the swivel frame has the swivel wheel attached to the lower surface side, the housing of the swivel device attached to the upper surface side, and the pinion insertion hole through which the pinion of the swivel device is inserted,
4. The structure according to claim 1, 2, 3 or 4, wherein the sealant application part and the sealant accommodating recess are provided between the bottom plate of the swivel frame and the housing of the swivel device so as to surround the pinion insertion hole. 4. The construction machine according to 4.

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