JP2006220220A - Reduction gear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a turning reduction gear having an elongated exchange period for lubricating oil and an improved working life by reliably removing contamination from the lubricating oil. <P>SOLUTION: The lubricating oil O in a casing 31 is guided from a biased position to the lower side of the casing 31 by a pump device 37. The contamination is removed from the guided lubricating oil O by a filter portion 107 and the lubricating oil O is circulated to the upper part of the casing 31. Thus, the contamination residing down in the casing 31 with a dead weight is sufficiently guided from the casing 31 together with the lubricating oil O and reliably removed from the lubricating oil O, suppressing the worsening of the lubricating performance of the lubricating oil O due to the contamination, elongating the exchange period for the lubricating oil O, and improving the working life. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a speed reducer including a casing filled with a fluid lubricant.

  2. Description of the Related Art Conventionally, a work machine such as a hydraulic excavator, for example, has an upper swing body provided on an upper portion of a lower traveling body capable of traveling via a swing bearing portion. A turning device that turns the traveling body is provided. And such a turning apparatus is provided with the turning motor and the reduction gear which decelerates rotation of this turning motor and transmits to a turning bearing part.

  This type of speed reducer is provided with a speed reduction mechanism connected to the rotating shaft of the swing motor and decelerating the rotation of the swing motor at the upper part of the casing attached to the upper swing body. An output shaft for outputting the rotation of the turning motor decelerated by the decelerating mechanism is connected, and the casing is filled with lubricating oil.

  In such a speed reducer, with the drive, foreign matter such as casting sand or wear powder mixes in the lubricating oil in the casing and the lubricity due to the lubricating oil deteriorates, and the gear of the speed reducing mechanism, the bearing, etc. Service life may be reduced.

For this reason, a pipe is led out from the upper side of the casing constituting the outer side of the speed reduction mechanism, the tip of the pipe is connected to the lower side of the casing, and a metal mesh filter is provided on the pipe. In accordance with the operation of the speed reduction mechanism, the lubricating oil is guided to the upper opening of the pipe by centrifugal force, and when the lubricating oil is circulated through the pipe to the lower side of the casing, the foreign matter contained in the lubricating oil ( A speed reducer that removes (contamination) is known (for example, see Patent Document 1).
JP 2001-227623 A (page 2-3, FIG. 1)

  However, since the contamination contained in the lubricating oil accumulates in the lower part of the casing, the above-described speed reducer that circulates the lubricating oil from the upper side to the lower side of the casing has sufficient contamination contained in the lubricating oil in the casing. However, it is not easy to lead out to the piping, and it is not easy to sufficiently remove the contamination.

  The present invention has been made in view of such points, and provides a reduction gear that can reliably remove foreign matters contained in a lubricant, extend the replacement time of the lubricant, and improve the service life. It is the purpose.

  According to the first aspect of the present invention, there is provided a casing filled with a fluid lubricant, a speed reduction mechanism portion that is provided in the casing and decelerates an input rotation, and a speed reduced by the speed reduction mechanism portion. The output shaft that is driven by the rotation of the output shaft and the position that is biased to the lower side of the casing is led out of the lubricant in the casing, and the foreign matters contained in the derived lubricant are removed to remove the casing. A reduction gear including a pump device that circulates in an upper portion, and the lubricant in the casing is derived from the position biased to the lower side of the casing by the pump device, and foreign matters contained in the derived lubricant are removed. By circulating the lubricant in the upper part of the casing, the foreign matter that accumulates downward in the casing is sufficiently led out from the casing and reliably removed from the lubricant. There it worse is suppressed by the foreign matter, along with replacement timing of the lubricant is extended, thereby improving service life.

  According to a second aspect of the present invention, in the speed reducer according to the first aspect of the present invention, the speed reducer includes a cam provided on the outer periphery of the output shaft to convert the rotation of the output shaft into a reciprocating motion. A plunger pump that has a piston that reciprocates inside, and that sucks the lubricant into the cylinder at a position biased to the lower side in the casing by the reciprocation of the piston, and leads the lubricant out of the cylinder to the outside of the casing, and this plunger pump The pipe connected between the cylinder and the upper part of the casing and led out of the casing by the plunger pump passes through the inside of the pipe, and is provided in the pipe and is included in the lubricant passing through the pipe. And a filter part that removes foreign matter that is generated. The lubricant is sucked into the cylinder at a position where it is reciprocated in the cylinder and biased to the lower side of the casing, and the foreign material contained in the lubricant is removed by the filter provided in the pipe. By circulating the lubricant in the upper part of the casing, it is possible to automatically remove and circulate foreign substances from the lubricant during driving with a relatively simple configuration, which improves convenience.

  According to a third aspect of the present invention, in the speed reducer according to the second aspect, the casing is formed in a cylindrical shape, the cylinder is detachably screwed to the casing in a radial direction, and is fixed to the casing by a nut. The plunger pump cylinder can be detachably screwed in the radial direction of the cylindrical casing and fixed to the casing with a nut to facilitate the removal of the plunger pump for maintenance and the cylinder radial direction. The position can be easily adjusted.

  According to a fourth aspect of the present invention, in the speed reducer according to the second or third aspect, the filter unit has a first filter that removes metallic foreign matters contained in the lubricant that passes through the pipe, and a downstream side of the first filter. And a second filter that removes foreign matters smaller than the metal foreign matter removed by the first filter from the lubricant that passes through the pipe, and is included in the lubricant that passes through the pipe. A metal foreign object is removed by the first filter, and a foreign object smaller than the metal foreign object is removed by the second filter, thereby preventing a relatively large metal object from entering the plunger pump.

  According to a fifth aspect of the present invention, the speed reducer according to any one of the first to fourth aspects is used as a turning speed reducer that decelerates the rotation of the turning motor to turn the turning body of the working machine. By using it as a turning speed reducer that turns the turning body, the replacement time of the lubricant in the turning speed reducer of the work machine is extended and the service life is improved.

  According to the first aspect of the present invention, the lubricant in the casing is derived from the position biased to the lower side of the casing by the pump device, and the foreign matter contained in the derived lubricant is removed to remove the lubricant from the casing. By circulating to the upper part, foreign matter that accumulates downward in the casing can be sufficiently removed from the casing and reliably removed from the lubricant, and the lubricity due to the lubricant can be prevented from deteriorating due to the foreign matter. Can be extended and the service life can be improved.

  According to the invention of claim 2, the piston is reciprocated in the cylinder by the cam and the lubricant is sucked into the cylinder at a position biased downward in the casing and led out from the cylinder to the pipe, Foreign matter contained in the lubricant is removed by the filter provided in this pipe and the lubricant is circulated in the upper part of the casing, so that the foreign matter is automatically removed from the lubricant and circulated with a relatively simple configuration during driving. It is possible to improve convenience.

  According to the third aspect of the invention, the plunger pump cylinder can be detachably screwed in the radial direction of the cylindrical casing and fixed to the casing by the nut, so that the plunger pump can be easily removed for maintenance. The cylinder radial position can be easily adjusted.

  According to the fourth aspect of the present invention, the metal foreign matter contained in the lubricant passing through the pipe is removed by the first filter, and the foreign matter smaller than the metal foreign matter is removed by the second filter. Foreign matter can be prevented from entering the plunger pump.

  According to the fifth aspect of the present invention, by using it as a turning speed reducer for turning the turning body of the work machine, the replacement time of the lubricant in the turning speed reducer of the work machine is extended and the service life is improved.

  Hereinafter, the present invention will be described in detail with reference to the embodiment shown in FIGS.

  FIG. 6 shows a hydraulic excavator as a work machine. In this excavator, an upper revolving body 3 as a revolving body is provided on an upper portion of a lower traveling body 1 via a revolving bearing portion 2 so that the upper revolving body 3 can turn. A cab 4 for protecting an operator is mounted on the left side of the front part of the revolving unit 3, and a work device 5 is operably provided at the center of the front part of the upper revolving unit 3.

  Further, as shown in FIG. 5, the slewing bearing portion 2 is provided with a slewing bearing 11. The slewing bearing 11 has an inner ring 12 that is an annular inner gear fixed integrally to the lower traveling body 1, and an annular outer ring 13 that slidably slides with respect to the outer periphery of the inner ring 12. It is integrally fixed to a frame (not shown) of the body 3. The frame is provided with a turning device 15 that meshes with the inner ring 12 to turn the upper turning body 3 with respect to the lower traveling body 1.

  The number of swiveling devices 15 is set as appropriate according to the weight of the upper swiveling body 3. For example, a pair of swiveling devices 15 are provided in the embodiment shown in FIG. 1 to FIG. Therefore, only one swivel device 15 will be described below.

  As shown in FIG. 4, the turning device 15 includes a turning motor 21 that is a hydraulic motor as a fluid pressure motor, and a turning speed reducer 22 as a speed reducer that reduces the rotation of the turning motor 21 and transmits it to the inner ring 12. And have.

  The swing motor 21 is connected to the swivel joint 24 shown in FIG. 5 provided at the rotation center of the upper swing body 3 and connected to a control valve (not shown) via the pipe, and is provided on the upper swing body 3. It is driven by supply and discharge of working oil as working fluid to a working oil tank (not shown), and an output shaft (not shown) protrudes from the lower part, and this output shaft is provided at the upper part of the swivel speed reducer 22. It is integrally attached to the upper part of the swivel speed reducer 22 so as to be splined.

  As shown in FIGS. 1 and 4, the swivel speed reducer 22 includes a substantially cylindrical casing 31, and the casing 31 is provided with a speed reduction mechanism portion 32. An output shaft is provided below the speed reduction mechanism portion 32. 33 is spline-coupled so that its tip protrudes downward from the casing 31 and the outer peripheral surface of the output shaft 33 is rotatably supported by bearings 34 and 35, and the bearings 34 and 35 of the output shaft 33 An eccentric cam 36 as a cam is provided on the outer peripheral surface at a position therebetween, a pump device 37 driven by the eccentric cam 36 is provided on a side portion of the casing 31, and a level gauge 38 is provided on the upper portion of the casing 31. Is provided.

  The casing 31 includes a substantially cylindrical casing cover 41 that is connected to the turning motor 21, a gear portion 42 that is an internal gear provided at the lower portion of the casing cover 41, and a substantially lower portion that is provided at the lower portion of the gear portion 42. A cylindrical housing part 43 and a substantially cylindrical cage 44 provided at the lower part of the housing part 43 are formed in a substantially cylindrical shape coaxially with each other, and the casing cover 41, the gear part 42 and the housing part 43 are formed. The housing portion 43 and the cage 44 are integrally fixed by a plurality of bolts 47.

  In the casing 31, an accommodating portion 48 that accommodates a part of the speed reduction mechanism portion 32 is partitioned by the casing cover 41, the gear portion 42, and the upper portion of the housing portion 43, and the bearings 34, 35 are disposed on the inner periphery. An output shaft insertion portion 49 that is fitted to the surface and into which the output shaft 33 is inserted is partitioned by the housing portion 43 and the cage 44 so as to communicate with the lower portion of the housing portion 48, and the lubricating oil O as a fluid lubricant Is filled.

  The casing cover 41 has a disc-shaped cover main body 51, and an insertion hole 52 into which the lower end portion of the turning motor 21 is inserted is formed at the center of the cover main body 51. Further, the peripheral edge portion of the cover body 51 is bent downward, and a flange portion 53 projects from the bent lower end portion in the radial direction. A plurality of bolt insertion holes 54 into which the bolts 46 are inserted are formed in the flange portion 53 in the circumferential direction.

  The gear portion 42 forms an outer peripheral portion of the speed reduction mechanism portion 32, and a plurality of bolt screw holes 55 into which the bolts 46 are screwed are formed in the circumferential direction.

  Further, the housing portion 43 is provided with a fitting flange portion 56 that is fitted to the lower end portion of the gear portion 42 at the upper end portion, and a lower portion of the fitting flange portion 56 is reduced in diameter so that it is smaller than the lower end portion. A mounting seat 57 projects from the outer peripheral surface slightly above. The mounting seat 57 is a portion that is fixed to the upper portion of the frame of the upper swing body 3 via a spacer (not shown) and integrally fixes the swing device 15 to the frame of the upper swing body 3. A plurality of holes are formed in the circumferential direction.

  The housing 43 has an upper bolt hole 58 into which the tip end of the bolt 46 is screwed at a position corresponding to the bolt screw hole 55 at the upper end, and the bolt 47 is screwed into the lower end. A plurality of lower bolt holes 59 are formed in the circumferential direction.

  In addition, a step-like fitting seat portion 61 into which the bearing 34 is fitted from above is provided inside the housing portion 43, and a step-like fitting seat portion into which the bearing 35 is fitted from below. 62 is provided on the lower side corresponding to the mounting seat portion 57.

  Further, a pedestal portion 64 that is continuous vertically upward from the base end portion of the mounting seat portion 57 is provided at a position above the mounting seat portion 57 on the side portion of the housing portion 43. A threaded hole 65 that is a female thread groove communicating with the shaft insertion portion 49 and into which a part of the pump device 37 is detachably threaded is formed in the radial direction. Accordingly, the screwing hole 65 is located slightly above the fitting seat 62. An inclined portion 66 that is inclined upward is formed at the upper portion of the screw hole 65 on the output shaft insertion portion 49 side so as to expand toward the central axis direction of the casing 31.

  Further, the cage 44 has an insertion hole portion 71 through which the output shaft 33 is inserted at the center, and the inner peripheral edge on the upper side of the insertion hole portion 71 has no gap on the outer peripheral surface of the output shaft 33. A seal fitting seat portion 74 is provided to which oil seals 72 and 73 which are O-rings which are brought into sliding contact and prevent leakage of the lubricating oil O are fitted.

  Further, a seal fitting recess 77 is provided at the upper end portion of the cage 44 at a portion fitted to the lower end portion of the housing portion 43, and the seal fitting recess 77 is in close contact with the lower end portion of the housing portion 43. A sealing member 78 that is an O-ring is fitted.

  An insertion hole 79 into which the bolt 47 is inserted is formed in the outer peripheral portion of the cage 44 at a position corresponding to the lower bolt hole 59 of the housing portion 43.

  On the other hand, as shown in FIG. 1, the speed reduction mechanism portion 32 is, for example, a two-stage reduction type planetary gear train, and is arranged on the inner peripheral side of the gear portion 42 whose rotation is fixed with respect to the casing 31. The part 81 and the second carrier part 82 are rotatably provided in two upper and lower stages.

  The first carrier portion 81 includes a first sun gear 84 that is spline-coupled with the output shaft of the turning motor 21 and rotates integrally with the output shaft. The first planetary gear 85 is engaged with the peripheral gear, and the first planetary gear 85 is rotatably held by a substantially cylindrical rotatable first carrier 86 as a first gear holder. .

  In addition, the second carrier portion 82 includes a rotatable second sun gear 92 having a lower gear 91 projecting from the lower portion of the first carrier 86 toward the central axis and meshed with the outer periphery. The second planetary gear 93 is meshed between the outer peripheral gear of the second sun gear 92 and the inner peripheral gear of the gear portion 42, and the second planetary gear 93 is connected to the second planetary gear 93. It is rotatably held by a substantially cylindrical rotatable second carrier 94 as a gear holder. At the lower part of the second carrier 94, a coupling portion 95 that is spline-coupled to the outer periphery of the upper end portion of the output shaft 33 above the bearing 34 projects in the direction of the central axis.

  Further, spacers 96 and 97 are interposed between the first sun gear 84 and the second sun gear 92 and between the second sun gear 92 and the output shaft 33, respectively.

  The output shaft 33 outputs the rotation of the turning motor 21 decelerated by the speed reduction mechanism 32. The output shaft 33 is gradually expanded from the upper side to the lower side, and the lower end protrudes below the cage 44 of the casing 31. A gear-like engagement portion 33a is formed on the outer peripheral surface of the protruding lower end portion and meshes with the inner ring 12 of the slewing bearing 11 as shown in FIG.

  Further, as shown in FIG. 1, the bearing 34 has a spacer 101 interposed between a lower end portion and an upper surface portion of the eccentric cam 36. In the bearing 35, a spacer 102 is interposed between the upper end portion and the lower surface portion of the eccentric cam 36.

  The eccentric cam 36 rotates integrally with the output shaft 33 and converts the rotational movement of the output shaft 33 into a reciprocating motion. For example, the eccentric cam 36 is formed in an elliptical shape in a plan view and extends in the axial direction of the output shaft 33. It is mounted vertically with respect to it. The shape of the eccentric cam 36 is appropriately set according to the driving conditions of the pump device 37.

  The pump device 37 includes a plunger pump 104 that is detachably attached in a radial direction of the casing 31 through a screwing hole 65 of the casing 31, and a circulation hole formed in the plunger pump 104 and the casing cover 41 of the casing 31. A pipe 106 communicating with the section 105, a filter section 107 provided in the pipe 106, and a check valve 108 as a check valve provided between the plunger pump 104 and the filter section 107 in the pipe 106. And have.

  The plunger pump 104 includes a substantially bottomed cylindrical cylinder 111 whose outer periphery is formed in the shape of a male screw, and a piston 112 inserted into the cylinder 111 so as to be reciprocally movable. 111 is detachably screwed, and a nut 113 is fitted on the outer periphery of the cylinder 111 and attached to the pedestal portion 64, thereby being fixed to the casing 31. That is, the plunger pump 104 is biased to the lower side of the casing 31.

  The cylinder 111 has a discharge port 115 communicating with the pipe 106 formed at the bottom, and communicates with the inside of the casing 31 through the inclined portion 66 of the screwing hole 65 to supply the lubricating oil O in the casing 31 to the cylinder 111. A suction port 116 for sucking into the opening is formed in the side portion.

  The piston 112 has a substantially cylindrical small diameter portion 117 smaller in diameter than the inner diameter of the cylinder 111 on one end side and a substantially cylindrical large diameter portion 118 substantially equal to the inner diameter dimension of the cylinder 111 on the other end side. The small diameter portion 117 side is inserted into the cylinder 111, and a spring 119 for biasing the piston 112 toward the central axis side of the casing 31 is interposed between the small diameter portion 117 and the bottom of the cylinder 111. Further, the large-diameter portion 118 is connected to the outer peripheral portion of the eccentric cam 36, and is reciprocated in the cylinder 111 by the eccentric cam 36.

  The pipe 106 circulates the lubricating oil O in the casing 31 discharged from the discharge port 115 of the cylinder 111 of the plunger pump 104 to the upper part of the casing 31, and one end is connected to the discharge port 115, and the other The end is connected to the circulation hole 105.

  The filter unit 107 includes a first filter 121 located on the upstream side of the pipe 106 and a second filter 122 located on the downstream side of the first filter 121.

  The first filter 121 removes metal foreign matter (metal contamination) contained in the lubricating oil O discharged from the plunger pump 104 and passing through the pipe 106. For example, the first filter 121 is coarser than the magnet or the second filter 122. It consists of a mesh filter.

  The second filter 122 removes foreign matters (contamination) finer than the metal contamination removed by the first filter 121 from the lubricating oil O that passes through the pipe 106, and has a greater eyesight than the first filter 121. It consists of a fine mesh filter.

  Further, the check valve 108 prevents the lubricating oil O in the pipe 106 from flowing back to the plunger pump 104.

  The level gauge 38 detects the level of the lubricating oil O in the casing 31.

  Next, functions and effects of the embodiment shown in FIGS. 1 to 6 will be described.

  When the operator operates various switches and levers in the cab 4, hydraulic oil whose flow rate and direction are controlled by the control valve is supplied to the swing motor 21 through the swivel joint 24, and the swing motor 21 is operated. The output shaft rotates, and the first sun gear 84 is rotated integrally with the rotation.

  Then, the first planetary gear 85 meshed with the first sun gear 84 rotates, and the first carrier 86 rotates due to the reaction force from the gear portion 42 meshed with the first planetary gear 85, The second sun gear 92 meshed with the lower gear 91 of the first carrier 86 rotates, and the second planetary gear 93 meshed with the second sun gear 92 rotates, and this second planetary gear. The second carrier 94 is rotated by the reaction force from the gear portion 42 with which the teeth 93 are engaged, and the output shaft 33 splined with the coupling portion 95 of the second carrier 94 is further rotated.

  The rotation of the output shaft 33 causes the turning device 15 to turn with respect to the inner ring 12 of the turning bearing 11 together with the outer ring 13 of the turning bearing 11, so that the upper swing body 3 to which the turning device 15 and the outer ring 13 are fixed becomes the inner ring. It turns with respect to the lower traveling body 1 to which 12 is fixed.

  At the same time, the rotation of the output shaft 33 is converted into the reciprocating motion of the piston 112 by the eccentric cam 36 to the plunger pump 104, and when the piston 112 moves in the direction of the central axis of the casing 31 by the spring 119, as shown in FIG. When the portion 118 moves to the center axis side from the suction port 116 of the cylinder 111, the lubricating oil O in the casing 31 is sucked from the suction port 116 into the cylinder 111 via the inclined portion 66.

  At this time, due to the function of the check valve 108, the lubricating oil O or the like in the pipe 106 is not sucked into the cylinder 111 from the discharge port 115.

  As shown in FIG. 3, when the piston 112 is pushed into the cylinder 111 against the biasing force of the spring 119, the suction port 116 of the cylinder 111 is closed by the large diameter portion 118, and the cylinder of the lubricating oil O The suction into the 111 is cut off, and the lubricating oil O sucked into the cylinder 111 is discharged from the discharge port 115 to the pipe 106.

  When the discharged lubricating oil O passes through the first filter 121, metal contamination is removed, and further, contamination that is smaller than metal contamination is removed when passing through the second filter 122. It is circulated from the circulation hole 105 to the upper part in the casing 31 through 106.

  As described above, according to the embodiment shown in FIGS. 1 to 6, the lubricating oil O in the casing 31 is derived from the position biased to the lower side of the casing 31 by the pump device 37, and this is derived. The contamination contained in the lubricating oil O is removed by the filter unit 107 and the lubricating oil O is circulated in the upper part of the casing 31 so that the contamination that accumulates downward in the casing 31 due to its own weight is removed from the casing 31 together with the lubricating oil O. It can be sufficiently derived and reliably removed from the lubricating oil O, the deterioration of the lubricity by the lubricating oil O due to contamination can be suppressed, the replacement time of the lubricating oil O can be extended, and the service life can be improved.

  Further, the eccentric oil 36 provided on the outer periphery of the output shaft 33 causes the piston 112 of the plunger pump 104 to reciprocate in the cylinder 111 so that the lubricating oil O is sucked into the cylinder 111 at a position biased downward in the casing 31. By removing the contamination contained in the lubricating oil O from the inside of the cylinder 111 to the pipe 106 and removing the contamination contained in the lubricating oil O by the filter unit 107 provided in the pipe 106, the lubricating oil O is circulated in the upper part of the casing 31. With the configuration, it is possible to automatically remove and circulate the contamination from the lubricating oil O during driving, thereby improving convenience.

  Further, the cylinder 111 of the plunger pump 104 is detachably screwed in the radial direction of the cylindrical casing 31 and fixed to the casing 31 with a nut 113, so that the plunger pump 104 can be easily removed for maintenance, and the cylinder The radial position of 111 can be easily adjusted.

  The plunger pump 104 is provided in the casing 31 at a position slightly above the bearing 35, so that the pump device 37 can be easily accessed when the swing speed reducer 22 is attached to the upper swing body 3, and the casing Plunger pump 104 can be arranged as low as possible in casing 31 without complicating the internal structure of 31 and the like more than necessary.

  Further, metal contamination contained in the lubricating oil O passing through the pipe 106 is removed by the first filter 121, and contamination smaller than this metal contamination is removed by the second filter 122, so that relatively large metal contamination is obtained. Nation or the like can be prevented from entering the plunger pump 104.

  Furthermore, by using the turning speed reducer 22 as a turning speed reducer for turning the upper turning body 3 of the work machine, the replacement time of the lubricating oil O in the turning speed reducer of the work machine can be extended and the service life can be improved. .

  In the above embodiment, a plurality of eccentric cams 36 and plunger pumps 104 may be provided corresponding to each other. In this case, the contamination in the casing 31 can be derived more efficiently.

  Further, as the cam, a cam other than the eccentric cam 36 can be used. For example, a crank-shaped cam or a piston 112 is fitted on the outer peripheral surface of the output shaft 33, and the piston is rotated along with the rotation of the output shaft 33. A configuration may be provided in which a groove or the like in which the 112 reciprocates is provided.

  Furthermore, it is possible to extend the suction port 116 of the plunger pump 104 to above the oil seals 72 and 73 below the bearing 35 so that the contamination can be sucked into the cylinder 111 more reliably.

  The pipe 106 may be able to detect the level of the lubricating oil O instead of the level gauge 38.

  The reduction gear can be used not only as the turning reduction gear 22 but also as various other reduction gears of the hydraulic excavator, a working machine other than the hydraulic excavator, and a general reduction gear.

It is side surface sectional drawing which shows one Embodiment of the reduction gear which concerns on this invention. It is side surface sectional drawing which shows the suction state of the lubricant to the cylinder of a reduction gear same as the above. It is side surface sectional drawing which shows the discharge state of the lubricant from the cylinder of a reduction gear same as the above. It is the side view which notched a part which shows the turning apparatus provided with the reduction gear same as the above. It is a top view which shows the principal part of the working machine provided with the reduction gear same as the above. It is a side view which shows a working machine same as the above.

Explanation of symbols

O Lubricant as lubricant 3 Upper revolving structure as revolving structure
21 slewing motor
22 Swivel reducer as reducer
31 Casing
32 Deceleration mechanism
33 Output shaft
36 Eccentric cam as cam
37 Pumping equipment
104 Plunger pump
106 Piping
107 Filter section
111 cylinders
112 piston
113 nut
121 First filter
122 Second filter

Claims (5)

A casing filled with a fluid lubricant;
A speed reduction mechanism that decelerates the input rotation provided in the casing;
An output shaft for outputting rotation decelerated by the deceleration mechanism, and
A pump device that is driven by the rotation of the output shaft and derives the lubricant in the casing from a position biased to the lower side of the casing, and removes foreign matter contained in the derived lubricant and circulates it in the upper part of the casing. And a speed reducer comprising: A cam provided on the outer periphery of the output shaft for converting the rotation of the output shaft into a reciprocating motion;
The pump device
It has a piston that reciprocates in the cylinder by a cylinder and a cam, and the lubricant is sucked into the cylinder at a position biased to the lower side in the casing by the reciprocation of the piston, and is led out from the cylinder to the outside of the casing. A plunger pump;
A pipe connected between the cylinder of the plunger pump and the upper part of the casing, and the lubricant led out of the casing by the plunger pump passes through the inside,
The speed reducer according to claim 1, further comprising: a filter unit that is provided in the pipe and removes foreign matter contained in the lubricant that passes through the pipe. The casing is formed in a cylindrical shape,
The speed reducer according to claim 2, wherein the cylinder is screwed to the casing so as to be detachable in a radial direction, and is fixed to the casing by a nut. The filter part
A first filter for removing metallic foreign matter contained in the lubricant passing through the pipe;
It has a 2nd filter which is located in the downstream of this 1st filter, and removes the foreign material smaller than the metal foreign material removed by this 1st filter from the lubricant which passes piping. The speed reducer according to claim 2 or 3. The speed reducer according to any one of claims 1 to 4, wherein the speed reducer is used as a speed reducer for reducing the rotation of the swing motor to turn the swing body of the work machine.

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