JP2562045Y2 - High and low speed switching type belt transmission for walking type mobile agricultural machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a high-low speed switching type belt for a walking type mobile agricultural machine which can be transmitted from a drive shaft to a driven shaft by high-low speed switching with two belts. It relates to a transmission.

[Conventional technology]

Conventionally, in a walking-type mobile agricultural machine configured to be capable of high-low speed transmission by mounting both belts on a drive pulley on the drive shaft side having a large and small diameter pulley and a driven shaft side, the driven pulley on the driven shaft side Has a structure in which both pulleys respectively supporting both belts are integrally fitted and fixed to a driven shaft.

[Problems to be solved by the invention]

Therefore, in such a structure, the double tension system is adopted, but the tension structure for tensioning both belts separately and the operation structure for selecting and operating two wires with a lever at hand are complicated. And the surrounding structure becomes large, and the belt on the side where the tension clutch is turned off is rotated from the driven pulley side, causing the belt to rotate and causing damage to the belt. Was presented.

[Means for solving the problem]

The present invention solves such a problem and, moreover, enables the clutch body to be reliably operated in a narrow space. Therefore, the engine (13) is mounted in front of the transmission case (12). Mission case (12)
Extend the handles (15) and (15) to the rear of the engine (1
In a walking type mobile agricultural machine in which power can be transmitted from the drive shaft (2) of (3) to the driven shaft (3) which is an input shaft of the transmission case (12), a large and small diameter pulley (1a) is mounted on the drive shaft (3).
A drive pulley (1b) composed of (1b) is provided, and a driven pulley (5a) (5b) is provided substantially parallel to a driven shaft (3) as an input shaft, and the drive pulley (1) and the driven pulley (5a) (5b) are provided. ) With the belts (4a) and (4b), respectively, and engaging one of the driven pulleys (5a) and (5b) with the driven shaft (3) between the driven pulleys (5a) and (5b) provided substantially in parallel. Possible clutch body (8)
Is slidable in the axial direction, and a stay (7a) for sliding the clutch body (8) is mounted on the driven shaft (3) in a direction substantially orthogonal to the driven shaft (3), and the stay (7a) is connected to the handle (15). (15) and a stay (7a) on one side of the stay (7a).
a) is provided with a rotatable first pivot member (25), and the first pivot member (25) is provided with a protruding body (26), and the stay (7a) is pivoted around a pivot. A second rotating member (27) operable to move is provided, a rotating operation member (10) is provided on the second rotating member (27), and the protruding body (26) and the rotating operation member (10) are provided.
An elastic body (28) is stretched over the handle, and the turning operation member (10) is turned from the handle gripping side, so that the stay (7a) is
, And the clutch body (8) is slid to switch freely between high and low speeds.

[Action]

Therefore, when shifting from a high speed to a low speed or from a low speed to a high speed, the operator rotates the stay extending from the handle gripping side to the gripping side so that the clutch body is connected to one of the driven pulleys. The transmission can be switched to one of high and low speeds by switching the transmission.

〔Example〕

 Next, an embodiment shown in the drawings will be described.

FIG. 2 is a side view of a management machine which is an example of a walking type mobile agricultural machine. An engine (13) is mounted in front of a transmission case (12) having both wheels (11) mounted on a lower portion thereof. Both handlebars (15) are connected to a handle frame (14) extending from the upper part of (12), and the drive shaft (2), which is the engine shaft of the engine (13), is closer to the transmission case (12). It is configured in the same manner as the conventional structure so that it can be transmitted to the driven shaft (3) which is the input shaft.

A drive pulley (1) including a large-diameter pulley (1a) and a small-diameter pulley (1b) is fitted and fixed to the drive shaft (2), and the driven shaft (3) has two driven pulleys (5a) having the same diameter. ) (5b)
Are spaced apart and locked so as not to move in the axial direction, and are loosely fitted with bearings (16) interposed therebetween, and the large and small diameter pulleys (1a) (1b) and the driven pulleys (5a) (5b) And a support frame plate (17) fixed on the engine (13) in the lateral direction, and a support frame fixed on the lateral side of the transmission case (12). Board (1
On the outer side of 8), a belt cover (20) which can be attached and detached with a mounting screw (19) is attached, and the drive pulley is moved from a support plate (21) fixed to the support frame plate (17) so as to be vertically movable. A belt presser (22) extends downward in the vicinity of (1).

The driven pulleys (5a) and (5b) are made of aluminum die-cast, and three bosses (3) are formed on the outer periphery of the boss and penetrate in the axial direction and are concentrically elongated. In addition, a narrow clutch wheel (8) serving as a clutch body is spline-fitted to a portion of the driven shaft (2) between the driven pulleys (5a) and (5b). An outer circumferential groove (8a) is formed on the outer circumference, and three projections (9) that can be fitted into the elongated holes (6) are formed at three equally-spaced positions on both outer circumferential sides. I do.

A round bar stay (7a) extending in a direction perpendicular to the driven shaft (3) is rotatably mounted between the driven pulleys (5a) and (5b). Board (18)
The other end is inserted into the belt cover (20) and fitted to the support plate (24) fixed to the transmission case (12) side, and the stay (7a) The upper part of both shifters (7) formed by bending a round bar into a U-shape so that the lower end can be fitted into the outer peripheral groove (8a) of the clutch wheel (8) is fixed to the middle part of (2). An arm (25), which is a first rotating member, is suspended from the lower portion of the arm (25), and can project into a recess (24a) formed in a lower portion of the support plate (24). Extend the body pin (26),
A lower portion of an operation arm (27) serving as a second rotating member is loosely fitted to a distal end of a stay (7a) protruding outward from the support plate (24), and an upper portion of the operation arm (27) is , Tip (10
The lever (10), which is a rotating member, is inserted so that a) can abut on the upper edge (24b) of the support plate (24), and the lever (10) and the pin (26) are Both ends of a tension spring (28) which is an elastic body are continuously formed.

A support cylinder (31) is rotatably fitted to a support shaft (29) fixed to the support plate (18) side, and an operation arm (32) extending from the support cylinder (31). The hole (32
In (a), an operation wire (33) capable of being pulled upward is continuously connected, and a tension arm is provided on the other end of a support shaft (34) having one end mounted on the tip of the operation arm (32). The intermediate part of (35) is mounted on a shaft, and the attention arm (35)
Tension rollers (30a) (30b), which can contact from below the both belts (4a) (4b), are mounted on the support shafts (36a) (36b) mounted on both ends of the It is fitted.

Therefore, when switching to low-speed transmission, as shown in FIG. 7, when the lever (10) is largely operated in the direction of the arrow (a), the tip (10a) of the lever (10) is moved to the support plate (2).
4) The operation arm (27) is rotated by abutting against the upper edge (24b), where the tension spring (28) goes over the fulcrum and the pin (26) is moved to the concave notch (24a). The arm (25) is slightly rotated in the direction of the arrow (b) until it abuts on one end of the shifter (7), and at the same time, the stay (7a) rotates slightly and engages the shifters (7) and (7). The driven clutch wheel (8) can be moved to the driven pulley (5b) side, and each protrusion (9) on one side fits into each elongated hole (6) of the driven pulley (5b). The clutch is engaged and low speed transmission is possible.

In this case, when the operation wire (33) is pulled in the direction of arrow (C), the operation arm (32) is rotated about the support cylinder (31), and the tension roller (30a) ( 30b) acts on a seesaw type and both belts (4a)
(4b) can be given tension.

When switching to high-speed transmission, when the lever (10) is largely operated in the reverse arrow (a) direction, as shown by the phantom line in FIG. 7, the distal end (10a) of the lever (10) is moved to the support plate. At the point where it abuts against the upper edge (24b) of the (24), the tension spring (2
The arm (25) pivots slightly in the direction of the arrow (b) until the pin (26) abuts the other end of the recess (24a) after the fulcrum 8) is over the fulcrum. 7) The clutch wheel (8) is moved to the driven pulley (5a) side by (7), and each projection (9) fits into each long hole (6), and the clutch is engaged.

FIG. 10 shows another embodiment, in which stays (37a) (37b) extending right and left from the rear of the handle frame (14) are connected with the distal ends of both handle bars (15) (15) by connecting pins (38a) ( 38b)
Are rotatably connected to each other via both handlebars (1
5) At the inside of the front part of (15), the ends of both screw rods (39a) (39b), which are oppositely screwed, are connected via connecting pins (40a) (40b), respectively. (39a) (39b) is formed by screwing into a hexagonal turnbuckle (41). By simply turning the turnbuckle (41), the width of the left and right handlebars (15) (15) The adjustment can easily be made always equally divided with respect to the center.

[Effect of the invention]

Thus, in the present invention, the engine (13) is mounted in front of the transmission case (12), and the handles (15) and (15) extend to the rear of the transmission case (12).
In a walking-type mobile agricultural machine in which power can be transmitted from the drive shaft (2) to the driven shaft (3) which is an input shaft of the transmission case (12), the drive shaft (3) has large and small diameter pulleys (1a) (1b).
And a driven pulley (5a) (5b) is provided substantially in parallel with a driven shaft (3) as an input shaft, and the driving pulley (1) and the driven pulley (5a) (5b) are (4a)
(4b) and the driven pulley (5) and the driven shaft (3) between the driven pulleys (5b) provided substantially in parallel with the driven pulley (5
a) A clutch body (8) engageable with one of (5b) is made slidable in the axial direction, and a stay (7a) for sliding the clutch body (8) is substantially moved with respect to the driven shaft (3). The stay (7a) is extended on the handle (15) (15) side, and the stay (7a) is rotatable on one side of the stay (7a) using the stay (7a) as a fulcrum. A first rotating member (25),
The first rotating member (25) is provided with a protruding body (26), and the stay (7a) is provided with a second rotating member (27) that can be rotated around a rotating fulcrum. 27) is provided with a rotation operation member (10), and the protruding body (26) and the rotation operation member (10) are provided.
An elastic body (28) is stretched around the handle (7a) by rotating the rotation operating member (10) from the handle grip side.
By rotating the clutch body (8), the clutch body (8) is slidably switched between high and low speeds, so that the clutch body (8) is engaged with one of the driven pulleys (5a) and (5b) in a narrow space. The belt transmission that can be operated at either high speed or low speed can be reliably switched, and a compact structure that is smaller than a conventional complicated structure can be achieved. become. In addition, since the stay (7a) extending to the handle grip side can be rotated to switch between high and low speeds, the operator does not need to move to and operate the handle other than the handle grip side, and the operator can handle the handle with one hand. The gears can be shifted while holding the grip, thereby improving operability. Also, as a result of the elastic body (28) stretched over the protruding body (26) and the rotating operation member (10) exceeding the stay (7a) as a fulcrum, the stay (7a) is rotated to move the clutch body (8). To slide
The clutch body (8) can be reliably engaged with one of the driven pulleys (5a) and (5b). Furthermore, the rotation operation member (1
0) and the elastic body (28) stretched over the protruding body (26)
As long as the clutch body (8) does not exceed the fulcrum, the clutch body (8) does not move from one driven pulley to the other driven pulley. Even if the clutch body (8) rotates and disengages from one driven pulley, if the elastic body (28) does not exceed the fulcrum, the clutch body (8) is again coupled to the disengaged driven pulley. And the operator again operates the clutch body (8).
This eliminates the need for an operation for sliding, and has the effect of increasing efficiency.

[Brief description of the drawings]

FIG. 1 is a plan cross-sectional view of a main part of an embodiment of the present invention, FIG. 2 is a side view of a walking type mobile agricultural machine, FIG. 3 is a side view of a part of FIG. 1, and FIG. 5 is an enlarged view of a part of FIG. 5, FIG. 5 is a side view of FIG. 4, FIG. 6 shows a part of FIG. 3, and FIG.
FIG. 8 is a sectional view taken along the line VII-VII of FIG. 8, FIG. 8 shows a part of FIG. 1, and FIG. 9 shows a side view thereof. (1a) ... large diameter pulley, (1b) ... small diameter pulley (2) ... drive shaft, (3) ... driven shaft (4a) (4b) ... belt (5a) (5b) ... driven pulley (7) ... shifter, (7a) ... stay (8) ... clutch body, (10) ... rotating operation member (25) ... first rotating member, (26) ... projecting body (27) ... second rotating member

Claims (1)

(57) [Scope of request for utility model registration] An engine (13) is mounted in front of a transmission case (12), and handles (15) and (15) are extended rearward of a transmission case (12), from a drive shaft (2) of the engine (13). In a walking-type mobile agricultural machine capable of transmitting power to a driven shaft (3) serving as an input shaft of a transmission case (12), a driving pulley (1) including large and small diameter pulleys (1a) and (1b) on a driving shaft (3). The driven pulleys (5a) and (5b) are provided substantially parallel to the driven shaft (3), which is the input shaft, and the driving pulley (1) and the driven pulleys (5a) (5b) are connected to the belts (4a) (4b).
And driven pulleys (5a) (5) between driven pulleys (5a) and (5b) provided substantially parallel to each other.
b) A clutch body (8) that can be engaged with one of them is slidable in the axial direction, and a stay (7a) for sliding the clutch body (8) is moved in a direction substantially orthogonal to the driven shaft (3). A shaft is mounted, the stay (7a) is extended toward the handle (15) (15), and one side of the stay (7a) is rotatable about the stay (7a). A rotating member (25);
A protruding body (26) is provided on the turning member (25), and a second turning member (27) that can be turned around the stay (7a) is provided, and the second turning member (27) is provided on the second turning member (27). A rotating operation member (10) is provided, an elastic body (28) is stretched over the protruding body (26) and the rotating operation member (10), and the rotating operation member (10) is rotated from the handle grip side. A high-low speed switching type belt transmission device for a walking-type mobile agricultural machine, wherein a stay (7a) is rotated by operating the clutch body (8) so that the clutch body (8) slides so as to be freely switchable between high speed and low speed.