JP2006254785A - Lubrication structure of work equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubrication structure for a working device with suppressed cost increase and good lubricity.
A power transmission device 10 of a hedge trimmer 1 includes a drive gear 11, a driven gear 13 that rotates in mesh with the drive gear 11, and a transmission mechanism unit 20 that is connected to the gear and transmits power from the driven gear. The working unit 50 that receives predetermined power and performs a predetermined work, and the gear case 60 that rotatably supports the drive gear 11, the driven gear 13, and the transmission mechanism unit 20 and accommodates grease are provided. Rods 25 and 25 ′ pivoted between the driven gear 13 and the working unit 50 are provided. The lubrication structure of the power transmission device 10 is provided with inner side surfaces 81a and 82a of a gear case 60 surrounding the drive gear 11 and the driven gear 13 close to these gears, and the vicinity of the meshing portion 15 of these gears and the driven gear of the rod. The first communication groove 68 connects the position close to the movement locus range of the large rotation portion 27 on the side. The grease fed from the meshing part 15 flows into the first communication groove 68 and is supplied to the large rotation part 27.
[Selection] Figure 1

Description

  The present invention relates to a lubrication structure for a working device including a transmission mechanism that converts a rotary motion of a handheld work machine, particularly a hedge trimmer, a mower, a brush cutter, etc. into a reciprocating motion.

  A hand-held work machine, such as a hedge trimmer, includes a transmission mechanism that converts rotational motion into reciprocating motion. Grease is generally used for lubrication of the transmission mechanism, but if the grease supply to the drive parts in the transmission mechanism is insufficient, seizure, wear, etc. occur and the transmission mechanism is damaged. There is a fear. Therefore, it is sufficient to periodically replenish the grease so that the supply of the grease does not become insufficient, but this replenishment work is troublesome for the operator.

  On the other hand, a ball bearing or needle bearing is attached to the rotating part in the transmission mechanism to reduce grease supply, or a recess or notch is provided in the driven gear that transmits power to the transmission mechanism to accept grease. A hand-held work device has been developed that facilitates improvement of lubricity (see Patent Document 1).

  In this hand-held work device described in Patent Document 1, a rotating portion (ring in the literature) is slidably fitted to an eccentric cam (eccentricator in the literature) attached to a side surface of a driven gear (gear in the literature). The rotating portion is provided with a plurality of blades extending therefrom. For this reason, when the driven gear rotates, the eccentric cam rotates in conjunction with the driven gear, and the rotating portion and the blade reciprocate. At this time, since the side surface of the rotating portion is in sliding contact with the side surface of the driven gear, these side surfaces may be seized or worn. Therefore, a seizure or the like is prevented by providing a recess (in the literature, a recess) capable of receiving the lubricating oil on the side surface of the driven gear.

JP-A-10-136784

  In the hand-held work device described in Patent Document 1, even if lubricating oil is received in the recess, the clearance between the housing that accommodates the driven gear and the transmission mechanism and the driven gear and the transmission mechanism is large. Depending on the posture, the lubricating oil received in the recess may flow out, and sufficient lubricating performance may not be exhibited.

  On the other hand, in a hand-held work device equipped with a ball bearing or a needle bearing, there is a problem that the cost increases due to an increase in the number of parts.

  An object of the present invention is to provide a lubrication structure for a work device that suppresses an increase in the cost of a hand-held work device and has good lubricity, and meets the demand.

  In order to solve such problems, the present invention provides a drive gear that rotates by receiving power from a drive source (for example, the engine in the embodiment), and power from the drive gear that meshes with the drive gear. A driven gear that receives and rotates, a transmission mechanism that is connected to the driven gear and transmits power from the driven gear in conjunction with the driven gear, and receives power from the transmission mechanism to perform a predetermined operation. A working device (for example, a hedge trimmer in the embodiment) including a working unit and a gear case that rotatably supports at least the drive gear, the driven gear, and the transmission mechanism unit and accommodates a lubricant (for example, grease in the embodiment). In 1), the transmission mechanism portion is a lubricating structure for a working device having a rod rotatably connected between the driven gear and the working portion, and the inner side surface portion of the gear case surrounding the drive gear is driven by the drive mechanism. The inner surface of the gear case that is provided close to the gear and surrounds the driven gear is provided close to the driven gear, and the movement locus range of the rotating portion on the driven gear side of the rod is in the vicinity of the meshing portion of the drive gear and the driven gear. A first communication path (for example, the first communication groove 68 in the embodiment) that communicates with a position near the first position is provided in the gear case, and the lubricant that is sent out from the meshing portion by the rotation of the drive gear and the driven gear is supplied to the first communication path. It flows into the passage and is supplied to the rotating part.

  According to this invention, the inner side surface portion of the gear case is provided in the vicinity of the drive gear, the inner side surface portion of the gear case is provided in the vicinity of the driven gear, and the movement locus range of the rotating portion on the driven gear side in the vicinity of the meshing portion is provided. By connecting the first and second positions with the first communication path, the gap between the drive gear and the driven gear and the inner side surface surrounding them can be reduced. For this reason, the pressure of the lubricant in the vicinity of the meshing portion of the drive gear and the driven gear can be increased, and the pressurized lubricant can be supplied to the rotating portion of the rod on the driven gear side. As a result, it is possible to efficiently improve the lubricity with few parts without mounting a bearing or the like. In particular, even when the amount of lubricant in the transmission mechanism decreases, the lubricant adhering to the drive gear and the driven gear moves to the teeth of the drive gear and the driven gear due to centrifugal force. The rotating portion can be reliably lubricated from the vicinity of the portion.

  Further, according to the present invention, the movement trajectory range of the rotating portion of the rod (for example, the large rotating portion 27 in the embodiment) in which one side of the first communication path is slidably fitted to an eccentric cam provided in the driven gear. The lubricant is supplied to the sliding surface of the rotating portion that fits in the driven gear.

  According to this invention, by opening one side of the first communication path to the inside of the movement locus range of the rotating portion of the rod that is slidably fitted to the eccentric cam provided on the driven gear, It can be directly guided to the sliding surface of the rotating portion that slides relative to the eccentric cam, and the lubricity of the sliding surface can be further improved.

  Further, the present invention is characterized in that a concave portion is provided on the sliding surface, and one side of the first communication path is opened within a movement locus range of the concave portion, and the lubricant is supplied to the concave portion.

  According to this invention, the concave portion is provided on the sliding surface, and the lubricant can be directly guided to the concave portion by opening one side of the first communication path within the movement locus range of the concave portion. It is more advantageous to receive the lubricant on the surface, and the lubricity of the rotating part can be further improved.

  Furthermore, the present invention provides an inner surface portion at a position close to the movement locus of the gear case rod, and utilizes the pressure fluctuation of the lubricant generated by the volume fluctuation in the gear case that changes due to the movement of the eccentric cam and the rod. A lubricant is supplied to the rotating part.

  According to the present invention, the lubricant pump is provided in the transmission mechanism portion by providing the inner side surface portion at a close position surrounding the movement locus of the rod of the gear case and utilizing the pressure fluctuation of the lubricant due to the movement of the eccentric cam and the rod. It is possible to provide a function, and it is possible to improve the lubricity of the rotating portion without causing an increase in cost with a small design change without intervention of a bearing.

  Further, the present invention communicates the reduced space portion with the sliding surface in the vicinity of a position where the volume of the space portion to be reduced among the space portions in the gear case that is changed by the movement of the eccentric cam and the rod is substantially minimized. The second communication passage is provided.

  According to the present invention, the high pressure lubricant can be supplied to the sliding surface by communicating the space portion and the sliding surface by the second communication path in the vicinity where the space portion is substantially minimized. Furthermore, the lubricity of the rotating part can be improved.

  Further, the present invention is characterized in that a second communication path is provided in the rod.

  According to this invention, since the sliding surface and the space are always communicated with each other by the second communication path by providing the second communication path in the rod, the lubricity of the rotating part can be further improved.

  Further, the present invention is characterized in that a concave portion is provided on the sliding surface, one end side of the second communication path is connected to the concave portion, and the space portion in the concave portion and the reduced space portion are communicated.

  According to the present invention, since the concave portion provided on the sliding surface is connected to one end side of the second communication path, the lubricant is directly guided to the concave portion, so that the reception of the lubricant becomes more advantageous, and the second Coupled with the supply of lubricant from the communication path, the lubricity of the rotating part can be further improved.

  Furthermore, the present invention is characterized in that a receiving portion for receiving a lubricant is provided in the gear case, and the receiving portion is disposed without straddling two space portions in the gear case partitioned by the movement of the rod.

  According to this invention, by providing the lubricant receiving portion without straddling the two space portions partitioned by the movement of the rod, without reducing the operational effect of any of the inventions of claims 4 to 7, The amount of lubricant contained in the gear case can be increased, and the lubricity of the rotating part can be further improved.

  Further, the present invention is characterized in that the first communication path is arranged at a position where it is not blocked for a certain period of time by the movement of the eccentric cam and the rod provided in the driven gear.

  According to the present invention, the first communication passage is arranged at a position where it is not blocked for a certain period of time by the movement of the cam and the rod, so that the lubricant sent from the meshing portion can be easily supplied to the rotating portion. Therefore, the lubricity of the rotating part can be further improved.

  According to the lubricating structure of the working device according to the present invention, the inner side surface portion of the gear case is provided in the vicinity of the drive gear, the inner side surface portion of the gear case is provided in the vicinity of the driven gear, and the vicinity of the meshing portion and the driven gear side of the rod are provided. By connecting the position close to the movement trajectory range of the rotating portion with the first communication path, it is possible to provide a lubrication structure for a working device that suppresses an increase in cost and has good lubricity.

  A preferred embodiment of a lubricating structure for a working device according to the present invention will be described below with reference to FIGS. In the present embodiment, a lubricating structure of a hedge trimmer that cuts branches and leaves will be described. 1A and 1B show a bottom view and a cross-sectional view of the power transmission device 10 of the hedge trimmer 1. FIG. The power transmission device 10 includes a drive gear 11 that rotates by receiving power from an engine (not shown), a driven gear 13 that meshes with the drive gear 11 and rotates by receiving power from the drive gear 11, A transmission mechanism portion 20 that is attached to a side surface of the driven gear 13 and transmits power from the driven gear 13 in conjunction with the driven gear 13, and a working portion 50 that receives power from the transmission mechanism portion 20 and cuts branches and leaves. And a gear case 60 that rotatably supports the drive gear 11, the driven gear 13, and the transmission mechanism portion 20 and accommodates grease.

  As shown in FIG. 2 (component development view), the drive gear 11 includes a shaft portion 11a and a tooth portion 11b formed at the tip of the shaft portion 11a, and a bearing 61 mounted in the gear case 60. It is supported so that it can rotate freely. The driven gear 13 is larger in diameter than the pitch circle diameter of the drive gear 11, and circular eccentric cams 21, 21 ′ eccentric to the outside of the rotation center axis S of the driven gear 13 are integrally formed on both side surfaces of the driven gear 13. Is provided. These eccentric cams 21, 21 ′ have a smaller diameter than the driven gear 13 and are arranged in a straight line.

  The transmission mechanism 20 includes the pair of eccentric cams 21 and 21 'described above and rods 25 and 25' that are rotatably fitted to the eccentric cams 21 and 21 '. The rods 25 and 25 ′ are plate-like, and are formed on one end side of the connecting rod 26 and the connecting rod 26 and fitted with the eccentric cams 21 and 21 ′. It is formed on the end side and is rotatably fitted to the base of the working unit 50 and has an annular small rotating part 28 having a smaller diameter than the large rotating part 27. When the large rotating portion 27 is fitted to the eccentric cams 21 and 21 ′, the side surface on the front side of the large rotating portion 27 and the end surfaces of the eccentric cams 21 and 21 ′ are arranged on substantially the same plane.

  The working unit 50 includes a pair of blades 51 and 51 ′ extending from the power transmission device 10. The blades 51 and 51 'are plate-like, and a plurality of blades are arranged on the tip side along the extending direction of the blades 51 and 51'. The pair of blades 51, 51 ′ are arranged so that the side surfaces face each other, one blade 51 is connected to the rod 25 fitted to one eccentric cam 21, and the other blade 51 ′ is the other eccentric cam 21. It is connected to a 'rod 25 fitted in'. For this reason, when the drive gear 11 rotates, the pair of blades 51 and 51 ′ reciprocate in different directions via the transmission mechanism 20.

  The gear case 60 that accommodates the base of the drive gear 11, the driven gear 13, the transmission mechanism 20, and the working unit 50 configured as described above includes a main body 63 and a lid 70 that covers the main body 63. As shown in FIGS. 1A, 1 </ b> B, and 2, the main body 63 has a substantially rectangular shape in plan view, and on the surface side of the main body 63, the drive gear 11, the driven gear 13, and the transmission mechanism unit. 20 and the main body side accommodation recessed part 64 which accommodates the base part of the working part 50 are formed. The main body side accommodating recess 64 accommodates the main body side cylindrical small concave portion 65 that accommodates the drive gear 11, the main body side cylindrical large concave portion 66 that accommodates the driven gear 13 and the transmission mechanism 20, and the base side of the working unit 50. And a main body side rectangular recess 67.

  On the other hand, a lid-side accommodation recess 71 formed so as to cover the main body-side accommodation recess 64 is formed on the back surface side of the lid 70. The lid-side accommodation recess 71 includes a lid-side cylindrical small recess 72 disposed to face the body-side cylindrical small recess 65, a lid-side cylindrical large recess 73 disposed to face the body-side cylindrical large recess 66, and the body It has the side rectangular recessed part 67 and the lid side rectangular recessed part 74 opposingly arranged.

  When the lid part 70 is fixed to the main body part 63, the main body side cylindrical small concave part 65 and the lid side cylindrical small concave part 72, the main body side cylindrical large concave part 66 and the lid side cylindrical large concave part 73, the main body side rectangular concave part 67. And the lid-side rectangular recess 74 are continuously connected to each other, and a first accommodating portion 81 that accommodates the drive gear 11, a second accommodating portion 82 that accommodates the driven gear 13 and the transmission mechanism portion 20, and a base portion of the working portion 50. A third accommodating portion 83 is formed. The lid part 70 is fastened by a plurality of bolts and fixed to the main body part 63.

  The inner side surface portion 81a of the first housing portion 81 is disposed close to the drive gear 11, and the inner side surface portion 82a of the second housing portion 82 is driven by the driven gear 13 and the transmission mechanism portion 20 (eccentric cams 21, 21 ′, rod 25, 25 ').

  The first accommodating portion 81 and the second accommodating portion 82 intersect with each other, and each intersecting portion opens to communicate with the first accommodating portion 81 and the second accommodating portion 82. The teeth of the drive gear 11 and the driven gear 13 protrude and mesh with each other at the intersection. Hereinafter, a portion where the drive gear 11 and the driven gear 13 are engaged is referred to as an “engagement portion 15”.

  A gap between the drive gear 11 accommodated in the first accommodating portion 81 and the first accommodating portion 81, the driven gear 13 and the transmission rear portion 20 accommodated in the second accommodating portion 82, and the second accommodating portion 82. Grease that serves as a lubricant is injected into the gap between the base portion of the working unit 50 housed in the third housing portion 83 and the third housing portion 83.

  The main body 63 closer to the bearing 61 than the meshing portion 15 has a position near the drive gear 11 and a position near the meshing portion 15 within the range of the movement trajectory T indicated by the oblique line of the large rotation portion 27 of the rod 25. A first communication groove 68 that communicates with each other is formed. The first communication groove 68 only needs to communicate between the position near the meshing portion 15 and the position near the range of the movement trajectory T of the large rotation portion 27, and the tunnel connecting the main portion 63 to these positions. A shaped channel may be provided. The first communication groove 68 is disposed at a position where the first communication groove 68 is not blocked for a certain period of time by the movement of the eccentric cam 21 and the large rotation portion 27 of the rod 25. For this reason, grease can be easily injected into the large rotation portion 27 from the vicinity of the meshing portion 15 and the lubricity of the large rotation portion 27 can be improved.

  On the sliding surface 27a of the large rotating portion 27 fitted to the eccentric cams 21 and 21 ', a concave portion 27b that opens to the space portion 82b in the second accommodating portion 82 is formed. One side of the first communication groove 68 described above is open in the movement locus range of the recess 27b. Therefore, as shown in FIGS. 3A to 3C, when the large rotation portion 27 of the rod 25 ′ is at a position away from the first communication groove 68, the grease flowing out from the first communication groove 68 is Although the sliding surface 27a is not positively received in the recess 27b, when the large rotation portion 27 moves to the position shown in FIG. 3D, the grease flowing out from the first communication groove 68 is transferred to the recess 27b. It is received and positively supplied to the sliding surface 27a. For this reason, it is possible to efficiently improve the lubricity of the sliding surface 27a with few parts without attaching a bearing or the like to the large rotation portion 27. In particular, even when the amount of grease in the transmission mechanism portion 20 decreases, the grease adhering to the drive gear 11 and the driven gear 13 moves to the tooth portions of the drive gear 11 and the driven gear 13 by centrifugal force. 11, the sliding surface 27a of the large rotation portion 27 can be reliably lubricated from the vicinity of the meshing portion 15 of the driven gear 13. Note that the recess 27b is not limited to the rods 25 and 25 ', and even if the recesses 27b are provided on the eccentric cams 21 and 21', the same effects as those provided on the rods 25 and 25 'can be obtained.

  Further, as shown in FIGS. 4 (a) and 4 (b), it changes in the vicinity of the connecting rod 26 side of the large rotation portion 27 of the rod 25 ′, more specifically, by the movement of the eccentric cam 21 ′ and the rod 25 ′. The space portion 82b ′ to be reduced and the large rotation portion 27 are slid in the vicinity of the position where the volume of the space portion 82b ′ to be reduced in the space portion 82b in the second accommodating portion 82 is substantially minimized. A second communication passage 30 that communicates with the surface 27a is provided. In addition, a recessed portion 31 that communicates with the space portion 82 b ′ in the second accommodating portion 82 is formed in the opening portion on the sliding surface 27 a side of the second communication passage 30.

Therefore, as shown in FIGS. 5A to 5H, the space portion 82b indicated by the oblique lines in the second accommodating portion 82 is formed by the arrow A of the eccentric cam 21 ′ (21) and the rod 25 ′ (25). It is partitioned into _two spaces 82b ₁ and 82b ₂ by the movement in the direction. And these spaces _82b 1, 82b ₂ are eccentric cam 21 '(21) and the rod 25' volume by movement varies (25), two volumes of the space portion _82b 1, 82b ₂ is reduced space 82b ₂ of the side that is briefly volume is reduced by movement of the eccentric cam 21 '(21) and the rod 25' (25) as shown in Figure 5 (b) ~ (f). When the 5 eccentric to the position shown in (g) cam 21 '(21) and the rod 25' (25) moves, the volume of the space portion 82b ₂ is substantially minimized. As a result, the grease present in the space portion 82b ₂ is received in the recess 31 flows into the second communication passage 30 boosts compressed, is supplied to the sliding surface 27a. That is, the transmission mechanism unit 20 has a pump function for feeding grease. For this reason, it is possible to efficiently improve the lubricity of the sliding surface 27a without attaching a bearing to the sliding surface 27a and without causing an increase in cost with a small design change. Note that the recess 31 is not limited to the rod 25 ′ (25), and even when the recess 31 is provided on the eccentric cam 21 ′ (21), the same effect as that provided on the rod 25 ′ (25) can be obtained. Further, the second communication passage 30 may be provided in the gear case 60 or the driven gear 13 if the above-described principle is applied without being provided in the rod 25.

In the embodiment described above, the grease is gradually consumed with the operation of the power transmission device 10, but there is a risk that insufficient lubrication of each drive component due to insufficient grease will occur. For this reason, in order to prevent grease shortage, a receiving portion 85 that receives grease may be provided on the bottom surface of the second storage portion 82 as shown in FIG. As shown in FIGS. 7A and 7H, the receiving portion 85 includes a space portion 82b in the second accommodating portion 82 partitioned by the rod 25 ′ (25), as shown in FIGS. 7B to 7F. As shown in FIG. 4, the two space portions 82b ₁ and 82b ₂ partitioned by the movement of the rod 25 ′ (25) are arranged on one side. In the present embodiment, the receiving portion 85 is provided in the space portion 82b ₂ located on the downstream side in the rod rotation direction (arrow A direction).

The shape of the receiving portion 85 is formed in a substantially semicircular shape so as not to straddle the _two space portions 82b ₁ and 82b ₂ , and the compression of the space portion 82b ₂ shown in FIGS. In the process, it is difficult for the grease to leak from the space portion 82b ₂ to the other space portion 82b ₁ . In the course of the compression space 82b ₂ shown in FIG. 7 (b) ~ (e) , the space portion 82b ₂ is filled with grease, if there is room to receive grease into the receiving portion 85, receiving from the space portion 82b ₂ The grease flows into the portion 85. Further, as shown in FIGS. 7 (f) and (g), in the vicinity where the compression of the space portion 82 b ₂ is highest, the receiving portion 85 is formed so as not to open into the space portion 82 b ₂ , and the rod 25. 'the second communication passage 30 (25) is in communication with the space portion 82b _2. Therefore, in the process shown in FIG. 7 (f) and (g), the grease filled in the space portion 82b _2, lubricates and flows to the sliding surface 27a from the second communication passage 30. Also as compressed volume of the space portion 82b ₂ in the process shown in FIG. 7 (f) and (g) is greater than the summed volume of the second communication passage 30 and the recess 31, by disposing the receiving portion 85 For example, since the grease flows densely through the second communication passage 30 and the grease is sufficiently received in the recess 31, it is more effective. 6 and 7, the receiving portion 85 is provided on the space portion 82b ₂ side, but may of course be provided on the space portion 82b ₁ side, or may be provided on each of the space portion 82b ₂ and the space portion 82b _1. good.

  As shown in FIG. 1, in the above-described embodiment, the example in which the main body 63 of the gear case 60 is processed has been described, but of course, the same processing may be performed on the lid portion 70 of the gear case 60. In the embodiments described so far, there is a possibility that the gear case 60 and the driving components (the driving gear 11, the driven gear 13, and the transmission mechanism unit 20) are in direct contact with each other. However, in order to protect the gear case 60 and the lid 70. A protective member (not shown) may be interposed between the first to third accommodating portions 81 to 83, the receiving portion 85, and the like. Further, the driven gear 13 may be provided with a receiving portion 85 to have the same effect.

1 shows a power transmission device of a hedge trimmer according to an embodiment of the present invention, in which FIG. (A) is a bottom view of the power transmission device, and (b) in FIG. It is sectional drawing of the part which corresponds. The partial expanded view of this power transmission device is shown. It is a bottom view of the power transmission device showing a positional relationship between a first communication path and a rod provided in the power transmission device. The 2nd communicating path provided in the power transmission device is shown, The figure (a) is a bottom view of a power transmission device, The figure (b) is the part corresponded to the IV-IV arrow of the figure (a). FIG. An explanatory view for explaining supply of grease by volume change of a space part is shown. The bottom view of the power transmission device which provided the receiving part is shown. An explanatory view for explaining supply of grease by a receiving part is shown.

Explanation of symbols

1 Hedge trimmer (working equipment)
DESCRIPTION OF SYMBOLS 11 Drive gear 13 Driven gear 15 Engagement part 20 Transmission mechanism part 21,21 'Eccentric cam 25,25' Rod 27 Large rotation part (rotation part)
27a Sliding surface 27b, 31 Concavity 30 Second communication path 50 Working part 60 Gear case 68 First communication groove (first communication path)
81a, 82a inner side surface part 82b, 82b ₂ space part 85 receiving part

Claims (9)

A drive gear that rotates by receiving power from a drive source; a driven gear that meshes with the drive gear and rotates by receiving power from the drive gear; and the driven gear connected to the driven gear; A transmission mechanism that interlocks and transmits power from the driven gear, a working part that receives power from the transmission mechanism and performs a predetermined operation, and rotates at least the drive gear, the driven gear, and the transmission mechanism. In a working device having a gear case that freely supports and accommodates a lubricant, the transmission mechanism portion includes a rod that is rotatably connected between the driven gear and the working portion. A lubrication structure for the working device,
An inner side surface of the gear case surrounding the drive gear is provided close to the drive gear,
An inner side surface portion of the gear case surrounding the driven gear is provided close to the driven gear,
A first communication path is provided in the gear case for communicating between the vicinity of the meshing portion of the drive gear and the driven gear and the position near the movement locus range of the rotating portion of the driven gear side of the rod;
A lubrication structure for a working device, characterized in that the lubricant sent from the meshing portion by the rotation of the driving gear and the driven gear flows into the first communication path and is supplied to the rotating portion.   One side of the first communication path opens to the inside of a moving locus range of the rotating portion of the rod that is slidably fitted to an eccentric cam provided in the driven gear, and the lubricant is supplied to the first communication path. 2. The lubrication structure for a working device according to claim 1, wherein the lubrication structure is supplied to a sliding surface of the rotating portion fitted to an eccentric cam.   3. The lubricant according to claim 2, wherein a concave portion is provided on the sliding surface, and the lubricant is supplied to the concave portion by opening one side of the first communication path within a movement locus range of the concave portion. Lubrication structure for work equipment. An inner side surface portion is provided at a position close to the movement locus of the rod of the gear case,
2. The lubricant is supplied to the rotating portion by utilizing a pressure variation of a lubricant generated by a volume variation in the gear case that is changed by the movement of the eccentric cam and the rod. 4. A lubricating structure for a working device according to any one of 3 above.   The reduced space portion and the sliding surface are communicated with each other in the vicinity of a position where the volume of the space portion to be reduced among the space portions in the gear case that is changed by the movement of the eccentric cam and the rod is substantially minimized. 5. The lubricating structure for a working device according to claim 4, further comprising a second communication path.   The lubricating structure for a working device according to claim 5, wherein the second communication path is provided in the rod.   7. The concave portion is provided on the sliding surface, and one end side of the second communication path is connected to the concave portion to communicate the space portion in the concave portion with the reduced space portion. Lubricating structure for the working device described   8. A receiving portion for receiving the lubricant is provided in the gear case, and the receiving portion is disposed without straddling two space portions in the gear case partitioned by the movement of the rod. The lubricating structure of the working device according to any one of the above.   The said 1st communicating path is arrange | positioned in the position which is not obstruct | occluded for a fixed time by the movement of the eccentric cam provided in the said driven gear, and the said rod. Lubrication structure for work equipment.

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