JP3703172B2 - Interlocking belt tension clutch device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an interlocking belt tension clutch device capable of reliably transmitting power to both driven pulleys and releasing power transmission by operating one clutch lever when transmitting the motive power to the two driven pulleys with a belt. About.
[0002]
[Prior art]
Conventionally, for example, as a lawn mower, a flat cutting blade that rotates along the top surface of a substantially horizontal reed and a sloped cutting blade that rotates along the slope of a reed with a downwardly inclined surface are mounted. One motor is known in which both the cutting blades are driven to rotate (see Japanese Patent Laid-Open No. 5-30837).
[0003]
In the mower having the above-described configuration, each transmission belt is loosely wound between a driving pulley provided on the output shaft of the prime mover and a driven pulley provided on each rotary shaft of the both cutting blades. In addition, the transmission of power (clutch engagement) and the release of power transmission (clutch disengagement) from the prime mover to both driven pulleys and further to both cutting blades are performed by the tension of the respective transmission belts and the release of the tension.
[0004]
That is, a tension roller that can be press-contacted is provided on the outer surface of each of the transmission belts, and the respective tension belt is pressed against the outer surface of each of the transmission belts by operating a clutch lever. A so-called belt tension that performs power transmission from the prime mover to the two cutting blades by tensioning and releases the tension of each transmission belt by releasing the tension of each transmission belt. Type clutch is adopted.
[0005]
[Problems to be solved by the invention]
The belt tension type clutch as described above has the following problems when the distance between the shafts of the driving pulley and the driven pulley is short.
[0006]
That is, when the distance between the shafts of the driving pulley and the driven pulley is short, the transmission belt (V-belt) is inevitably shortened. As a result, the transmission belt is wound when the power transmission is released (clutch disengagement). Returning to the previous original state, that is, trying to return to an annular shape, both the spanning ends are in pressure contact with the driving pulley and the driven pulley, and even if the clutch is disengaged, it is not actually completely disengaged. Is transmitted to the driven pulley, and the driven pulley sometimes rotates.
[0007]
As described above, if the driven pulleys do not stop immediately when the clutch is disengaged and rotate together, in the case of a mower, there is a risk that an operator may inadvertently touch the cutting blade and be injured. It was. Therefore, in order to prevent the rotation of the transmission belt, if the transmission belt is configured to be relatively long compared to the distance between the shafts of the driving pulley and the driven pulley, a large number of guides for preventing the transmission belt from coming off must be provided. When the power is transmitted, the tension roller must be pressed deeply against the transmission belt. As a result, the transmission belt can be rotated at a high speed in a state where the transmission belt is bent deeply at the short distance between the shafts. There was a problem that the property was impaired.
[0008]
The present invention has been made in view of the above circumstances, and when transmitting the motive power to the two driven pulleys by the transmission belt, the power transmission to both the driven pulleys and the release of the power transmission are surely performed by operating one clutch lever. An object of the present invention is to provide an interlocking belt tension clutch device that can be performed and that does not impair the durability of the transmission belt.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a first driving belt and a second driving belt wound around a first driving pulley and a second driving pulley from a first driving pulley and a second driving pulley fixed to an output shaft. The first transmission belt and the second transmission belt are slightly in contact with the first transmission belt and the second transmission belt in a state in which the clutch is disengaged by a single clutch operating lever. A first belt guide roller and a second belt guide roller are provided, and an outer portion of the other spanning portion facing the outer portion of the one spanning portion of the first transmission belt and the second transmission belt, the first tension roller and a second tension roller is caused to displacement is provided by a single clutch operation lever, the first belt guide rollers and a second belt guide roller In conjunction with the tensioning operation of the first transmission belt and the second transmission belt according to the first tension roller and a second tension roller, configured through a link mechanism so as to be separated from the first transmission belt and the second transmission belt Preferably, a belt guide for suppressing the spread of the first transmission belt and the second transmission belt wound around the first driven pulley and the second driven pulley is provided.
[0010]
[Action]
In the embodiment of the interlocking belt tension clutch device according to the present invention, for example, in the case of the mowing machine for scissors shown in the drawings, the operation wire 21 is operated by operating the cutting blade clutch lever 20 attached to the operation handle 6. When pulled, the clutch disengaged state of FIG. 2 is changed to the clutch engaged state of FIG.
[0011]
That is, the rear end portion 18b of the clutch operating lever 18 is pulled, and the first tension roller 12, the second tension roller 16, the first belt guide roller 24, and the second belt guide roller 25 are simultaneously displaced by the link mechanisms 26 and 27. To do.
[0012]
More specifically, the tip 18c of the clutch operating lever 18 is moved toward the second transmission belt 15 wound around the second driving pulley 13 and the second driven pulley 14, and the first swing plate 32, The second tension roller 16 supported via the second oscillating plate 35 is pressed against the outer surface of the second transmission belt 15 to tension the second transmission belt 15, and the second driving pulley 13. To the second driven pulley 14.
[0013]
At the same time, the interlocking rod 36 extended from the first swing plate 32 is pushed out toward the first driven pulley 10 and supported by the third swing plate 38 and the fourth swing plate 40. The tension roller 12 is pressed against the outer surface of the first transmission belt 11 wound between the first driving pulley 9 and the first driven pulley 10, and the first driving belt 11 is tensioned, and the first driving belt 11 is tensioned. Power is transmitted from the pulley 9 to the first driven pulley 10.
[0014]
At the same time, the first belt guide roller 24 provided at the first transmission belt 11 side end 28b of the rotating plate 28 is separated from the outer surface of the first transmission belt 11 by the action of the interlocking link 29, and The second belt guide roller 25 supported by the fourth rocking plate 40 is separated from the outer surface of the second transmission belt 15.
[0015]
That is, in the clutch engagement state of FIG. 3, power is transmitted from the first driving pulley 9 and the second driving pulley 13 to the first driven pulley 10 and the second driven pulley 14.
[0016]
Next, when releasing the power transmission from the first driving pulley 9 and the second driving pulley 13 that continue to rotate, the operation of the clutch can be performed by releasing the operation of the cutting blade clutch lever 20 (clutch disengaging operation). The rear end portion 18b of the lever 18 is pulled back by the coil spring 30, and the clutch is disengaged as shown in FIG.
[0017]
That is, the first transmission belt 11 and the second transmission belt are disposed on the other outer side of the first transmission belt 11 and the second transmission belt 15 at positions substantially opposite to the first tension roller 12 and the second tension roller 16. Since the first belt guide roller 24 and the second belt guide roller 25 that lightly contact the belt 15 are positioned, the first belt guide roller 24 and the second belt guide roller 25, the first tension roller 12, and the second tension roller 16, the original restoring force of the first transmission belt 11 and the second transmission belt 15, that is, the bulge, is suppressed, and the turning phenomenon is prevented as described above.
[0018]
Further, as in claim 2, belt guides 22a, 22b for suppressing the spread of the first transmission belt 11 and the second transmission belt 15 wound around both sides of the first driven pulley 10 and the second driven pulley 14, and Providing 23a, 23b further enhances the effect of preventing the turning phenomenon as described above.
[0019]
Furthermore, if belt guides 42 and 43 are provided on the outer circumferences of the first driving pulley 9 and the second driving pulley 13, the first transmission belt 11 and the second driving belt 11 in the first driving pulley 9 and the second driving pulley 13 are provided. The spread of the winding portion of the transmission belt 15 can be effectively suppressed.
[0020]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is an overall perspective view of an interlocking belt tension clutch device according to an embodiment of the present invention, FIG. 2 is a schematic plan view showing a “clutch disengaged” state of the interlocking belt tension clutch device, and FIG. 3 is an interlocking belt tension clutch device. FIG. 4 is a perspective view of the second tension roller portion, FIG. 5 is a perspective view of the first tension roller portion, and FIG. 6 is an overall perspective view showing an example of a grass mower. It is.
[0021]
6 includes a horizontal traveling portion X having a flat cutting blade 1 for cutting grass and the like on the upper surface of the shore and a prime mover 2 composed of an air-cooled gasoline engine, and the like. It has a tilting portion Y having a sloped cutting blade 3 for cutting grass or the like. In the figure, 4 is a front guide wheel, 5 is a rear drive wheel, 6 is an operation handle, 7 is a travel clutch lever, and 8 is an auxiliary wheel.
[0022]
Although not shown in detail in detail, the rear drive wheel 5 passes through a speed reducer comprising a propeller shaft, a transmission, a sprocket fixed to the output shaft of the transmission, a speed reduction sprocket, and a speed reduction chain. Driven.
[0023]
The power transmission to the flat cutting blade 1 in the grass mower having the above-described configuration is fixed to the first driving pulley 9 fixed to the output shaft 2a of the prime mover 2 and the rotating shaft 1a of the flat cutting blade 1. Between the first driven pulley 10 and the first driven belt 11 such as a V-belt that is loosely wound so that the power cannot be transmitted as it is. Between the second driving pulley 13 fixed to the output shaft 2a of the prime mover 2 and the second driven pulley 14 fixed to the rotary shaft 3a for transmitting power to the slope cutting blade 3, the state is not changed. This is performed by a second transmission belt 15 such as a V-belt which is wound loosely so that power cannot be transmitted.
[0024]
More specifically, the first tension roller 12 that is press-contacted to the outer surface of one span of the first transmission belt 11 and the outer surface of the one span of the second transmission belt 15. The first transmission belt 11 and the second transmission belt 15 are tensioned and released by the second tension roller 16 that is press-contacted to the power transmission (clutch) to be turned on and off. .
[0025]
The interlocking belt tension clutch device of the illustrated example is configured such that the tension of the first transmission belt 11 and the second transmission belt 15 and the release of the tension can be performed by operating one clutch lever. It is shown in FIGS.
[0026]
In the figure, reference numeral 17 denotes a support plate, which supports each member of the interlocking belt tension clutch device around the output shaft 2a of the prime mover 2, and is used as a clutch unit, for example, in the main body frame of a mowing mower. It is configured to be detachable.
[0027]
Reference numeral 18 denotes a clutch operation lever which is swingably operated by a cutting blade clutch lever 20 provided on the operation handle 6, and a tip end portion 18 c is wound between the second driving pulley 13 and the second driven pulley 14. A cutting blade clutch attached to the operation handle 6 is provided at the rear end portion 18b of the second transmission belt 15 so as to be rotatable about the pin 18a in the outer surface direction of one of the spanning portions of the second transmission belt 15. An operation wire 21 extended from the lever 20 is connected.
[0028]
In the embodiment of the drawings, the both sides of the first driven pulley 10 and the second driven pulley 14 are expanded so as to return to the natural annular shape of the wound first transmission belt 11 and second transmission belt 15. Belt guides 22a and 22b and 23a and 23b to be suppressed are provided.
[0029]
That is, in the clutch “disengaged” state, the first drive belt 11 and the second drive belt 15 are restored to the original state before being wound around the outer periphery of the first driven pulley 10 and the second driven pulley 14, that is, in an annular shape. Spread trying to return to. As a result, the first transmission belt 11 and the second transmission belt 15 are in pressure contact with the winding ends, that is, the outer ends of the first driven pulley 10 and the second driven pulley 14, and the clutch is disengaged. In addition, the rotation of the first driving pulley 9 and the second driving pulley 13 is transmitted to the first driven pulley 10 and the second driven pulley 14 and may rotate together. Therefore, the belt guides 22a, 22b and 23a, 23b are provided so as to suppress the spread of the first transmission belt 11 and the second transmission belt 15 and appropriately prevent the pressure contact state.
[0030]
In the case of the illustrated example, a clutch is provided on the outer side of the other transfer portion of the first transmission belt 11 and the second transmission belt 15 at a position substantially opposite to the first tension roller 12 and the second tension roller 16. At the time of “off”, the first transmission belt 11 and the second transmission belt 15 are lightly abutted to suppress the original restoring force of the first transmission belt 11 and the second transmission belt 15, that is, swell, and further, the clutch At the time of “ON”, the first transmission belt 11 and the second transmission belt 15 are interlocked with the first tension roller 12 and the second tension roller 16 that tension the first transmission belt 11 and the second transmission belt 15. The first belt guide roller 24 and the second belt guide roller 25 that are spaced apart from each other are linked to the clutch operating lever 18 to link mechanisms 26 and 27. It is provided through.
[0031]
That is, in addition to the belt guides 22a, 22b and 23a, 23b, the first tension roller 12, the first belt guide roller 24, the second tension roller 16, and the second belt guide roller 25 can also A means for suppressing the original restoring force of the transmission belt 11 and the second transmission belt 15, that is, swelling is configured.
[0032]
Describing the one link mechanism 26, a substantially intermediate portion of an inverted L-shaped rotation plate 28 is rotatably provided by a pin 28a on the side of the first transmission belt 11 of the support plate 17. The first belt guide roller 24 is provided at the end 28 b of the rotating plate 28 on the first transmission belt 11 side.
[0033]
The rear end portion 28c of the rotating plate 28 and the vicinity of the rear end portion 18b of the clutch operating lever 18 are connected by a link 29. Further, the rear end portion 28c of the rotating plate 28 and the clutch operating lever 18 are connected to each other. A tension coil spring 30 is interposed between the rear end portions 18b, and when the clutch is turned off, the first belt guide roller 24 provided at the first transmission belt 11 side end portion 28b of the rotating plate 28 is It is configured to lightly abut against the outer surface of the first transmission belt 11 and be separated when the clutch is “engaged”.
[0034]
Next, the other link mechanism 27 will be described. The distal end portion 18c of the clutch operating lever 18 has a support 31 that is erected on the support plate 17 as shown in FIG. A tip end portion 32 b of the first swing plate 32 that is rotatably supported is pivotally connected by a pin 33.
[0035]
Further, a first torsion coil spring 34 is wound on the upper surface side of the first swing plate 32 of the support column 31, and a second swing plate 35 is rotatably supported on the upper portion of the first torsion coil spring 34. The lower end 34a of the one torsion coil spring 34 is locked to the connection side of the clutch operating lever 18 of the first swing plate 32, and the upper end 34b is the rear end of the second swing plate 35 on the second transmission belt 15 side. Locked to the portion 35a.
[0036]
Further, the second tension roller 16 adapted to the second transmission belt 15 is rotatably provided on the upper surface of the distal end portion 35b of the second swing plate 35.
[0037]
As described above, the first tension plate 16, the first torsion coil spring 34, and the second swing plate 35 are not provided directly on the distal end portion 18 c of the clutch operation lever 18. The pressure contact force of the second tension roller 16 to the second transmission belt 15 is automatically adjusted by the first torsion coil spring 34, and the second transmission belt 15 is tensioned more than necessary. There is no effect.
[0038]
Further, one end 36 a of the interlocking rod 36 is rotatably connected by a pin 37 between the support 31 of the first swing plate 32 and the connecting portion of the clutch operating lever 18. The other end 36b is extended to the first tension roller 12 and the second belt guide roller 25 portion.
[0039]
Next, details of the first tension roller 12 and the second belt guide roller 25 will be described. The details are shown in FIG.
[0040]
That is, a third swing plate 38, a second torsion coil spring 39, and a fourth swing plate 40 are provided in order from below on a support column 37 erected on the support plate 17, and the second torsion coil spring 39. The lower end 39a of the third rocking plate 38 is engaged with the connecting side of the interlocking rod 36 to the other end 36b of the third rocking plate 38, and the upper end 39b is attached to the first tension roller 12 of the fourth rocking plate 40. It is locked to the side.
[0041]
The fourth swing plate 40 rotatably supports the first tension roller 12 adapted to the first transmission belt 11, and the other of the second transmission belt 15 when the clutch is turned off. A second belt guide roller 25 that is lightly brought into contact with the outer surface of the spanning portion and suppresses the swelling of the second transmission belt 15 is rotatably supported.
[0042]
Also in the first tension roller 12, as described with respect to the second tension roller 16, the pressure contact force against the first transmission belt 11 is automatically adjusted by the second torsion coil spring 39, and the first transmission belt 11 is It is not something that makes you more nervous than necessary.
[0043]
In the figure, 41 is a pin that rotatably connects the interlocking rod 36 and the tip end portion 38a of the third swing plate 38, and 38b is raised at the rear end of the third swing plate 38, Stoppers 42 and 43 for restricting the relative positional relationship between the third swing plate 38 and the fourth swing plate 40 are provided on the outer circumferences of the first driving pulley 9 and the second driving pulley 13, respectively. It is a belt guide that suppresses the spread of the first transmission belt 11 and the second transmission belt 15.
[0044]
【The invention's effect】
According to the present invention, the power transmission to the two driven pulleys and the release of the power transmission can be reliably performed by operating one clutch lever, and the durability of the transmission belt is not impaired. can get.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of an interlocking belt tension clutch device according to an embodiment of the present invention.
FIG. 2 is a schematic plan view showing a “cut” state of the interlocking belt tension clutch device of FIG. 1;
3 is a schematic plan view showing an “on” state of the interlocking belt tension clutch device of FIG. 1; FIG.
FIG. 4 is an enlarged perspective view of a main part of a second tension roller portion (indicated by an arrow IV in FIG. 2).
FIG. 5 is an enlarged perspective view of a main part of a first tension roller part (viewed by an arrow V in FIG. 2).
FIG. 6 is an overall perspective view showing an example of a straw mower.
[Explanation of symbols]
2a Output shaft 9 First driving pulley 10 First driven pulley 11 First transmission belt 12 First tension roller 13 Second driving pulley 14 Second driven pulley 15 Second transmission belt 16 Second tension roller 18 Clutch operating levers 22a and 22b Belt guides 23a and 23b Belt guide 24 First belt guide roller 25 Second belt guide rollers 26 and 27 Link mechanism

Claims (2)

From the first driving pulley (9) and the second driving pulley (13) fixed to the output shaft (2a) to the first driven pulley (10) and the second driven pulley (14), the first transmission belt (11) and the second driving pulley (11). Two transmission belts (15) are wound around, and a single clutch operation lever (18) is provided on the outer side of one of the first transmission belt (11) and the second transmission belt (15 ). wherein the first transmission belt (11) and the second transmission the first belt guide roller (24) which lightly abuts the belt (15) and a second belt guide roller (25) is provided in the clutch switching state by said first transmission The single clutch operating lever (18) displaces the outer portion of the other spanning portion facing the outer portion of the one spanning portion of the belt (11) and the second transmission belt (15). First tensi Nrora (12) and a second tension roller (16) is provided, the first belt guide roller (24) and the second belt guide roller (25), said first tension roller (12) and a second tension roller ( In association with the tension operation of the first transmission belt (11) and the second transmission belt (15) by 16), the first transmission belt (11) and the second transmission belt via the link mechanism (26 , 27). The interlocking belt tension clutch device is configured to be separated from (15). Belt guides (22a , 22b, 23a, 23b) that suppress the spread of the first transmission belt (11) and the second transmission belt (15) wound around the first driven pulley (10) and the second driven pulley (14). The interlocking belt tension clutch device according to claim 1, further comprising:

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