Mowing implement

Abstract

To provide a mowing implement capable of preventing an occurrence of non-operation of a one-way clutch.SOLUTION: A mowing implement 1 includes a work body 3 for performing mowing work and a power transmission part 4 for transmitting power from a tractor side and rotating the work body 3. The power transmission part 4 includes a driving side pulley 34 and a follower side pulley 35, a belt 36 wound on the pulleys 34 and 35, and a one-way clutch 33 provided between a driving side shaft and the driving side pulley 34. The driving side pulley 34 has an oil supply passage formed for supplying oil between the driving side pulley 34 and the one-way clutch 33.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a grass cutting machine. [Background technology]

[0002] 2. Description of the Related Art A grass cutting machine as described in, for example, Patent Document 1 below is known.

[0003] This conventional grass cutting machine comprises a working section which performs grass cutting work, and a belt-driven transmission device which transmits power to the working section, and this transmission device has a grease-type one-way clutch. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2023-62627 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the conventional grass cutting machine described above, the one-way clutch of the transmission is greased, and therefore there is a risk of the one-way clutch becoming inoperable due to clogging of the grease, etc.

[0006] SUMMARY OF THE PRESENT EMBODIMENTS Accordingly, one object of the present invention is to provide a grass cutting machine capable of preventing the one-way clutch from becoming inoperable. [Means for solving the problem]

[0007] A grass cutting machine according to an embodiment of the present invention comprises a body connected to a running vehicle, a working body that is attached to the body and performs grass cutting work while rotating, and a power transmission unit that transmits power from the running vehicle to rotate the working body, and the power transmission unit has rotating bodies that are spaced apart and facing each other, a power transmission body that is wound around both rotating bodies, a one-way clutch that is provided between either one of the rotating bodies and the rotating shaft, and an oil supply path for supplying oil between either one of the rotating bodies and the one-way clutch.

[0008] The mower also comprises a body connected to a running vehicle, a working body provided on the body and configured to perform grass cutting work while rotating, and a power transmission unit which transmits power from the running vehicle to rotate the working body, the power transmission unit including a rotating shaft which transmits power from the running vehicle, a driving side rotating body and a driven side rotating body which are spaced apart and opposed to each other, a power transmission body wound around the driving side rotating body and the driven side rotating body, a one-way clutch provided between the driving side rotating body and the rotating shaft, and an oil supply path for supplying oil between the driving side rotating body and the one-way clutch. Effect of the Invention

[0009] According to the embodiment of the present invention, it is possible to prevent the one-way clutch from becoming inoperative. [Brief description of the drawings]

[0010] [Figure 1] 1 is a side view of a grass cutting machine according to one embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. 2 is a partial cross-sectional view of a power transmission section of the grass cutting machine. [Figure 4] FIG. 2 is a diagram showing a drive-side pulley of the power transmission unit, in which (a) is a view from the axial direction, and (b) is a cross-sectional view taken along the line AA. [Diagram 5] 4A and 4B are diagrams showing a one-way clutch of the power transmission unit of the same, in which (a) is a diagram seen from the axial direction, and (b) is a diagram seen from the radial direction. [Figure 6] 1A and 1B are diagrams showing the operation of a one-way clutch in the power transmission section of the same vehicle, in which (a) is a diagram showing the connected state and (b) is a diagram showing the disconnected state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] One embodiment of the present invention will be described with reference to FIGS.

[0012] In Figures 1 and 2, 1 is a grass cutting machine. This grass cutting machine 1 is connected to the rear of a tractor (not shown) which is a traveling vehicle, and performs grass cutting work while moving forward (in the direction of travel) as the tractor travels.

[0013] That is, the grass cutting machine 1 cuts and shreds grass to be cut (for example, weeds, wheat straw, second ears, green manure, etc.) that is growing on a work surface while moving forward by the travel of the tractor.

[0014] The grass-cutting machine 1 comprises a body 2 which is detachably connected to a three-point link section (work machine lifting support section) at the rear of the tractor, a working body 3 which is rotatably mounted on the body 2 and performs grass-cutting work while rotating in a predetermined direction, and a power transmission section 4 which transmits power from the PTO shaft side of the tractor to rotate the working body 3 in the predetermined direction.

[0015] The grass cutting machine 1 also includes a gauge roller body 5 that runs in contact with the surface to be worked on, and the working height of the working body 3 during work is set by this gauge roller body 5.

[0016] The machine body 2 has a three-point linkage 11 that is detachably connected to a three-point link at the rear of the tractor. The three-point linkage 11 has a central top pin 12 and left and right lower pins 13. The top pin 12 is attached to a top mast 14, and the lower pins 13 are attached to lower arms 15.

[0017] The machine body 2 also has a transmission case (gear case) 16, and an input shaft 10, which is a power input part of the power transmission part 4, protrudes forward from this transmission case 16. The input shaft 10 is connected to a PTO shaft of a tractor via a joint (not shown).

[0018] Furthermore, the machine body 2 has a cover upper plate 18 that covers the upper part of the working body 3, and left and right cover side plates 19 (19L, 19R) that cover the sides of the working body 3, and a pulley cover 20, which is a box-shaped cover member, is removably provided on the outer surface side of the left cover side plate 19L. In other words, the pulley cover 20 is removably attached to an attachment portion 22 protruding from the cover side plate 19L by attachment means 21 such as a bolt.

[0019] The working body 3 is rotatably supported by both cover side plates 19 of the machine body 2, and has a left-right rotating shaft 26 that rotates (drives to rotate) by receiving power from the power transmission unit 4, and working claws 28 attached to each claw attachment portion (not shown) of the rotating shaft 26. A driven pulley 35 of the power transmission unit 4, which will be described later, is attached to the left end of the rotating shaft 26.

[0020] As shown in Figures 3 to 6, the power transmission section 4 includes, for example, an input shaft 10, a gear (not shown) in the transmission case 16, a drive side shaft (a rotating shaft for transmitting power from the traveling vehicle) 31 which is a rotating shaft in the pipe frame 23, a one-way clutch 33 which is a clutch means for transmitting power (rotational force) in only one direction, a drive side pulley (rotating body) 34 which is a drive side rotating body, a driven side pulley (rotating body) 35 which is a driven side rotating body facing the drive side pulley 34 at a predetermined distance, a belt 36 which is an endless power transmission body wound around both pulleys 34, 35, and a tension roller 37 which applies tension to the belt 36.

[0021] Furthermore, the power transmission unit 4 has an oil supply passage 40 for supplying lubricating oil between the drive-side pulley 34 and the one-way clutch 33, and this oil supply passage 40 is formed in the drive-side pulley 34. The lubricating oil flowing through the oil supply passage 40 is a liquid lubricating oil that has a lower viscosity than grease and a higher fluidity than grease.

[0022] As shown in FIG. 3, the one-way clutch 33 is attached by spline fitting to the outer periphery of the spline shaft portion 41, which is the portion (left end portion) of the drive-side shaft 31 that is located inside the pulley cover 20.

[0023] A screw hole 42 is formed in the splined shaft portion 41 of the drive-side shaft 31. A bolt 43 together with a washer 44 is screwed into the screw hole 42, whereby a backing plate 45 for preventing the clutch from coming off is fixed to the end face of the splined shaft portion 41. In Fig. 3, reference numeral 46 denotes an oil seal, 47 denotes a retaining ring, and 48 denotes a bearing.

[0024] As shown in FIG. 4, the drive pulley (clutch pulley) 34 has an inner cylindrical portion 51, an outer cylindrical portion 52 having a larger diameter than the inner cylindrical portion 51, and an annular portion 53 connecting these two cylindrical portions 51, 52.

[0025] A plurality of V-shaped grooves 54 that fit with fitting protrusions of the belt 36 are formed on the outer peripheral surface of the outer cylindrical portion 52. A plurality of engagement receiving recesses (step portions) 55 that are arranged at equal intervals in the circumferential direction are formed on the inner peripheral surface of the inner cylindrical portion 51.

[0026] Further, an oil supply passage 40 is formed in the inner cylindrical portion 51 for supplying lubricating oil between the inner peripheral surface of the inner cylindrical portion 51 and the outer peripheral surface of the one-way clutch 33 .

[0027] The oil supply passage 40 has a circular groove portion 56 that is shaped like a ring and is positioned along the circumferential direction (rotational direction) of the drive side shaft 31, and a plurality of long hole-shaped communication hole portions 57, for example two communication hole portions 57 (57a, 57b), that are positioned along the axial direction of the drive side shaft 31 and communicate with the annular groove portion 56.

[0028] The annular groove portion 56 is formed in a concave shape on the inner circumferential surface of the inner cylindrical portion 51 so as to intersect with the engagement receiving recess 55. In addition, the annular groove portion 56 is formed in an annular shape centered on the rotation center P of the drive-side pulley 34.

[0029] One of the two communication holes 57 (57a, 57b), the communication hole 57a, is formed at a position shifted by 90 degrees in the circumferential direction from the other communication hole 57b.

[0030] In other words, when the drive side pulley 34 is viewed from the axial direction (side view), the angle between the line connecting one communicating hole portion 57a ​​and the rotation center P and the line connecting the other communicating hole portion 57b and the rotation center P is 90 degrees (including approximately 90 degrees).

[0031] 4, that is, when one communication hole portion 57a ​​is located above the rotation center P in side view, the oil in the oil supply passage 40 is stored up to a height position near the other communication hole portion 57b. Therefore, in the state shown in FIG. 4, the other communication hole portion 57b also serves as an oil inspection hole (check opening) for checking the amount of oil (liquid lubricating oil) in the oil supply passage 40.

[0032] In addition, each communication hole portion 57 has an opening (oil filling port) 59 at the tip side which is opened and closed by removing and attaching a plug (e.g., a bolt, etc.) 58, which is, for example, a male threaded member, and a screw groove 60 is formed around this opening 59.

[0033] Therefore, the opening / closing port 59 is closed by screwing the plug 58 into the thread groove 60, and the opening / closing port 59 is opened by removing the plug 58 from the thread groove 60. Oil can be supplied (replenished) into the oil supply passage 40 from the opening / closing port 59 that opens at the end face of the drive-side pulley 34.

[0034] As shown in FIG. 5, the one-way clutch 33 has a cylindrical main body member 61 that rotates integrally with the drive-side shaft 31, clutch pawls 62 which are a plurality of claw-shaped clutch members that can be detachably engaged with the engagement receiving recess 55 of the drive-side pulley 34, and coil springs 63 which are a plurality of biasing members that bias the clutch pawls 62 radially outward.

[0035] The main body member 61 has a small diameter cylindrical portion 65 located at both axial ends, and a large diameter cylindrical portion 66 located at the axial center and formed with a larger diameter than the small diameter cylindrical portion 65. An annular oil groove 67 is formed on the outer circumferential surface of the large diameter cylindrical portion 66 and faces closely to the annular groove 56 on the inner circumferential side of the drive-side pulley 34. The width of the oil groove 67 is larger than the width of the annular groove 56 of the oil supply passage 40.

[0036] Furthermore, clutch pawl recesses 68 communicating with the oil groove 67 are formed at a plurality of locations, i.e., for example, at two locations, on the outer circumferential surface of the large diameter cylindrical portion 66, and a spring recess 69 is communicating with the clutch pawl recess 68. The clutch pawl recess 68 houses and arranges the clutch pawl 62, and the spring recess 69 houses and arranges the coil spring 63. The oil supplied through the oil supply passage 40 flows through the oil groove 67 on the outer circumferential side of the one-way clutch 33, and enters the clutch pawl recess 68 and the spring recess 69.

[0037] Next, the operation of the grass cutting machine 1 will be described.

[0038] When mowing work is to be performed, the mowing machine 1 is connected to the rear of a tractor and moved forward by the forward movement of the tractor.

[0039] Then, the working body 3 of the grass cutting machine 1 performs grass cutting work while rotating in a predetermined direction (for example, an up-cut direction) based on power from the PTO shaft side of the tractor.

[0040] That is, the power transmission section 4 of the grass cutting machine 1 transmits power (rotational power) from the PTO shaft side, which is being driven and rotated by the engine output of the tractor, to the working body 3, causing the working body 3 to rotate in a predetermined direction.

[0041] At this time, the one-way clutch 33 of the power transmission unit 4 is in a connected state (clutched state) in which the clutch pawl 62 is engaged with the engagement receiving recess 55 to transmit power, as shown in FIG. 6(a).

[0042] Therefore, the driving pulley 34 is driven to rotate together with the driving shaft 31 and the one-way clutch 33, and as a result, the belt 36 rotates, and the driven pulley 35 is driven to rotate together with the rotating shaft 26 of the working body 3. This causes the working claw 28 of the working body 3 to rotate in a predetermined direction to perform grass cutting work.

[0043] Furthermore, when the drive of the tractor's PTO shaft is stopped, for example because mowing work is interrupted or completed, an inertial force from the working body 3 acts on the drive side pulley 34, but the one-way clutch 33 of the power transmission unit 4 switches from the above-mentioned connected state to a disconnected state (clutch disengaged state) in which no power (inertial force) is transmitted, as shown in Figure 6(b), due to the elastic deformation of the coil spring 63, disengaging the clutch pawl 62 from the engagement receiving recess 55.

[0044] Therefore, the drive side pulley 34 rotates slippingly relative to the one-way clutch 33, and as a result, the power (inertia force) from this drive side pulley 34 is not transmitted to the drive side shaft 31, and the drive side shaft 31, input shaft 10, PTO shaft, etc. remain stopped, thereby preventing damage to the components of the power transmission section 4 due to overload.

[0045] Furthermore, in this type of grass cutting machine 1, the power transmission section 4 for rotating the working body 3 includes a drive side shaft 31 that transmits power from the tractor side, a drive side pulley 34 and a driven side pulley 35 that are spaced apart and facing each other, an endless belt 36 wrapped around the drive side pulley 34 and the driven side pulley 35, an oil-lubricated (oil-specification) one-way clutch 33 provided between the inner side of the drive side pulley 34 and the outer side of the drive side shaft 31, and an oil supply passage 40 for supplying oil between the inner side of the drive side pulley 34 and the outer side of the one-way clutch 33. Therefore, unlike conventional techniques, problems such as grease clogging do not occur, and the one-way clutch 33 can be appropriately prevented from malfunctioning.

[0046] Moreover, because it is oil lubricated, the components of the power transmission section 4 are resistant to wear and tear and last longer, improving durability.

[0047] In addition, after removing the pulley cover 20 from the mounting portion 22, the plug 58 can be removed to open the opening 59, making it easy to supply (lubricate) oil into the oil supply passage 40, and also making it easy to replace the components of the power transmission portion 4.

[0048] Furthermore, because the drive pulley 34 (clutch pulley) 34 is rotatable, it can be set to a predetermined state shown in Fig. 4 (a state in which one communication hole 57a is located above the center of rotation P and the other communication hole 57b is located to the side of the center of rotation P in side view) regardless of the attitude of the grass cutting machine 1, so that in this predetermined state, oil can be easily supplied using one communication hole 57a and oil can be easily checked using the other communication hole 57b. Moreover, oil can be easily drained by positioning either one communication hole 57a or the other communication hole 57b below the center of rotation P in side view.

[0049] In the above embodiment, a configuration in which the one-way clutch is provided between the driving side rotating body (driving side pulley) and the rotating shaft (driving side shaft) has been described; however, this is not limited to this, and for example, a configuration in which the one-way clutch is provided between the driven side rotating body (driven side pulley) and the rotating shaft (rotating shaft of the working body) may also be used.

[0050] Furthermore, the oil supply passage that supplies oil toward the one-way clutch side is not limited to a configuration having multiple communicating hole portions, for example, two communicating hole portions, that are connected to the annular groove portion, and the number of communicating hole portions is arbitrary, and may be, for example, one or three or more. [Explanation of symbols]

[0051] 1 Grass cutting machine 2. Aircraft 3. Working Body 4 Power transmission section 31 Drive shaft which is the rotating shaft 33 One-way clutch 34 Drive pulley (rotating body) which is the driving rotating body 35 Driven pulley (rotating body) which is the driven rotating body 36 Belts as power transmission devices 40 Oil supply passage 56 Annular groove 57 Communication hole 58 Stopper 59 Opening and Closing

Claims

1. A machine body coupled to a traveling vehicle; A working body that is provided on the machine body and performs grass cutting work while rotating; a power transmission unit that transmits power from the traveling vehicle side to rotate the working body, The power transmission unit includes: Rotating bodies opposed to each other and spaced apart from each other; a power transmission body wound around both of the rotating bodies; a one-way clutch provided between one of the two rotating bodies and a rotating shaft; an oil supply passage for supplying oil between the one of the rotating bodies and the one-way clutch; A grass cutting machine characterized by the above.

2. A machine body coupled to a traveling vehicle; A working body that is provided on the machine body and performs grass cutting work while rotating; a power transmission unit that transmits power from the traveling vehicle side to rotate the working body, The power transmission unit includes: A rotating shaft that transmits power from the traveling vehicle; a driving side rotating body and a driven side rotating body which are spaced apart and opposed to each other; a power transmission body wound around the driving side rotor and the driven side rotor; a one-way clutch provided between the drive-side rotor and the rotary shaft; An oil supply passage for supplying oil between the driving side rotor and the one-way clutch is provided. A grass cutting machine characterized by the above.

3. The oil supply passage is formed in the driving rotor.

3. The grass cutting machine according to claim 2.

4. The oil supply passage is An annular groove portion located along a circumferential direction of the rotating shaft; a plurality of communication holes located along the axial direction of the rotating shaft and communicating with the annular groove; 4. The grass cutting machine according to claim 1, wherein the brush cutter is a brush cutter.

5. Each communication hole has an opening that is opened and closed by attaching and detaching a plug.

5. The grass cutting machine according to claim 4.

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