JP2006122009A - Transmission case of walking type tiller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems of conventional walking type tillers which require many parts, many manufacturing processes and high manufacturing costs, because transmission mechanisms comprising travel system transmission mechanisms and working system transmission mechanisms are disposed in different transmission cases, respectively, followed by connecting both the cases to each other, or because transmission cases are manufactured with different molds in response to the transmission form of a transmission shaft. <P>SOLUTION: The transmission case (C) of the walking type tiller is manufactured in a single case comprising the first case portion having the travel system transmission mechanism (LI) therein and the second case portion having the working system transmission mechanism therein. Cores (B2a, B2b, B3a, B3b) in the lower end portion of the second case (C2) having the working system transmission mechanism therein, in a mold for forming the transmission case (C), are exchanged to form various lower cases, thus manufacturing different forms of tilling shaft transmission mechanisms (L1a, L1b). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a configuration of a transmission case of a walking type tiller.

Conventionally, for walk-type tillers, the simplest model in which the tiller shaft is normally rotated between series, a type in which the tiller shaft is inclined in a reverse V shape when viewed from the front, and a part of the tiller shaft are rotated in reverse. It is necessary to configure a plurality of types according to various operations such as a so-called partial forward / reverse rotation type.
Utility Kaihei 4-17060

  The power transmission cases of these tillers are made up of molds. In the conventional structure, each of the power transmission mechanisms of the traveling system transmission mechanism and the work system transmission mechanism can be switched according to the drive mode of each tillage shaft. Since both cases are connected to each other and the transmission case is manufactured with different molds according to the transmission form of the tillage shaft, the number of parts and production processes are increased, and the manufacturing cost is reduced. There was a problem of being expensive.

In view of the above problems, the present invention has taken the following technical means.
That is, the rotational power of the engine (E) is transmitted to the tilling shaft (2) that drives the tilling claw (1) through the work machine system transmission mechanism (L1) and travels through the traveling system transmission mechanism (L2). In the walking type tiller that transmits to the axle (4) that drives the wheel (3), the transmission case (C) of the tiller and the first case part (C1) that houses the traveling transmission mechanism (L1) The second case portion (C2) has a second case portion (C2) in which the work system transmission mechanism (L2) is housed, and the lower case portion (C2) has a different lower end portion. It was set as the transmission case of the walk type tiller characterized by having formed the unusual form tillage shaft transmission mechanism (L1a, L1b ...) by changing the lower end part formed with the casting_mold | template, or comprised separately.
(Operation of claim 1)
In the walking type tiller of claim 1 configured as described above, the work machine system transmission mechanism (L1) and the traveling system transmission mechanism (L2) are housed in a single transmission case (C). During production, the second case part (C1) that houses the work machine system transmission mechanism (L1) is partially replaced with a lower end mold (B2a, B2b, B3a, B3b), so that a transmission case with a different shape can be obtained. Constitute. Or the lower end part of a 2nd case part (C2) is comprised separately, and this is changed and the transmission case of a different form is comprised.

  In the walk-type field cultivator according to claim 1 configured as described above, each of the transmission cases in which the work machine system transmission mechanism (L1) and the traveling system transmission mechanism (L2) are housed are different from each other. Compared to the method of connecting with the case and the method of connecting the transmission case and the method of producing the entire transmission case according to the drive mode of the tillage shaft, the number of parts and production man-hours can be reduced and the cost can be reduced. .

Hereinafter, the walking type tiller of the present invention will be described based on the drawings.
First, the overall configuration of the walking type tiller T will be described.
As shown in FIG. 2, the walking type tiller has an engine mounting frame 11 disposed in the front part of the machine body, a bumper 12 provided in the front part of the frame 11, and a plate member bridged over the upper surface of the frame 11. The engine E is installed. In addition, a transmission case C formed in the shape of a letter “F” in a side view is provided in the rear upper part of the engine E, and a fuel tank 13 is provided in the upper part, and fuel in the tank 13 is burned to burn the engine E. Is driven, and the rotatory power of the engine E is driven through the various transmission mechanisms in the transmission case C to drive the axle 4 that supports the traveling wheels 3 and the tilling shaft 2 that supports the tilling claws 1.

  Further, a muffler 14 and a belt case 15 are provided on the side of the engine E, and the rotational power of the engine E is transmitted to the input shaft 30 of the transmission case C via a transmission belt V in the belt case 15. It has a configuration.

  Further, as shown in FIG. 3, a box-shaped case cover 16 is attached to the rear portion of the transmission case C, and a guide hole 23A for inserting the speed change lever 17 and a handle fixing lever 18 are provided on the rear surface of the cover 16. The guide hole 23B to be inserted is opened, and a bifurcated handle 19 is rotatably attached to the left and right side surfaces of the cover 16.

  Further, as shown in FIG. 4, the base portion 19a of the handle 19 is welded to the left and right side portions of the plate member 20 that bypasses the guide hole G23B. The body 21 is welded and supported, and the handle fixing lever 18 is slidably urged toward the guide hole 23B. Thus, the lower end portion of the handle fixing lever 18 is locked to the plurality of handle fixing holes 22a, 22b... Provided on the cover 16 side, and the handle position is adjusted.

  Further, as shown in FIG. 5, the front end portion 19b of the handle 19 bulges the left and right rear end portions into a large diameter, and a “U” -shaped pipe (hereinafter referred to as a grip frame 19c) in a plan view is formed inside thereof. The left and right ends are inserted and connected by bolts. A grip 19d made of urethane is attached around the grip frame 19c so as to be flush with the large diameter portion of the handle 19.

  Further, as shown in FIG. 6, on the left and right of the front end portion 19b of the handle 19, a clutch lever 25 having a belt-like plate member formed in a “U” shape in plan view is supported while being urged upward. By grasping the lever 25 with the handle 19, the structure is configured such that the body travels with the clutch Cr of the cultivator T being engaged.

Next, the transmission case C of the cultivator T, which is a main part of the present invention, will be described with reference to FIGS. 1, 7, and 8.
The transmission case C is a cast case in which right and left substantially symmetrical cases are combined and connected by bolts and nuts, and a traveling transmission mechanism L1 is provided in a projecting portion at the front (hereinafter referred to as a first case portion C1). When the working system transmission mechanism L2 is installed inside the rear extension portion (hereinafter referred to as the second case portion C2) and the integrated case is manufactured, the lower end portion C2a of the second case portion C2, that is, By exchanging the nests around the bearing portion of the tillage shaft 2, various different forms of tillage portions are formed.

  Specifically, when producing a transmission case C of a walking tiller T having a horizontal and uniaxial tiller shaft 2 as shown in FIG. 7, as shown in FIG. The molds B1a and B1b are opposed to each other, and the left and right first inserts B2a and B2b are opposed to and attached to the inside of the main molds B1a and B1b and located at the lower end C2a of the second case part C2. Accordingly, when a molten metal such as an aluminum alloy is filled between the left and right molds, the left and right sides (right side in FIG. 7) of the transmission case C shown in FIG. 7 can be manufactured. Since the manufacturing method is the same for the cases on the left and right other sides, the description thereof is omitted. 7 and FIG. 8 indicate a portion cast with the insert.

  Moreover, when producing the transmission case C of the walking type tiller T having the horizontal tiller shaft 2 that rotates horizontally and forward and backward as shown in FIG. 8, as shown in FIG. The same type main molds B1a and B1b are made to face each other, and inside the main molds B1a and B1b, a portion that is located at the lower end C2a of the second case part C2 is formed with a different shape and bearing support part. Install the two nestings B3a and B3b facing each other. Thereby, like the above, when the molten metal is filled, the left and right side portions (right side in FIG. 8) of the transmission case C shown in FIG. 8 can be manufactured. In addition, since the manufacturing method is the same also about the transmission case of right and left other side part, description is abbreviate | omitted.

  As described above, in the transmission case C of the walking type tiller T, the transmission case C in which the work machine transmission mechanism L1 and the traveling transmission mechanism L2 are housed is configured as a separate case. Compared with the method of connecting this, or producing the entire transmission case in a separate type according to the drive mode of the tillage shaft, the number of parts such as bolts and nuts and assembly man-hours are reduced, and the production cost is reduced. Can be reduced.

  In the transmission case C, the place where the inserts B2a, B2b, B3a, and B3b are replaced is the flat surface of the recess 5 of the transmission case C that allows the tip of the claw 1 to pass when the tilling claw 1 rotates. When constructing the lower part of the transmission case among the series of cultivators T that share the same, the inserts B2a, B2b, B3a, B3b can be made as lightweight and small as possible, so that the insert replacement work during casting is also possible It is simple and, like the above, it is possible to reduce the number of steps and reduce the production cost.

Next, the transmission structure comprised in the said transmission case is demonstrated.
First, the transmission configuration of the walking type tiller shown in FIG. 7 will be described as a first mode.
In the transmission case C, an input shaft 30 for inputting power from the belt and the pulley and a transmission shaft 31 provided along with the belt and the pulley are mounted on the transmission case C. As the system transmission mechanism L1, two transmission shafts (first shaft 32 and second shaft 33) in order from the top of the transmission, and the differential mechanism 34 and the differential mechanism 34 are extended from side to side and the traveling wheel 3 is mounted. It has a configuration in which the axles 4 and 4 and gears, chains, and the like meshing between the respective shafts are internally provided.

  More specifically, a slide gear 36 having large, medium, and small three-stage gears G1, G2, and G3 is provided on the tip end side of the input shaft 30, and a counter having the large and small two-stage gears G4 and G5 on the transmission shaft 31. The shaft 37 is configured to rotatably support the shaft 37. Further, the first shaft 32 is provided with a spline gear G9 that always meshes with the flat gear G7 and the flat gear G8 on the second shaft 33 side, and is configured to always transmit power from the second shaft 33 to the differential mechanism 34 via a chain 38. It has become.

Further, as shown in FIG. 9, the differential mechanism 34 is configured to drive the left and right bevel gears 34a and 34b with a pinion gear 35b only from one of the upper and lower sides.
In the traveling system transmission mechanism L1 of the tiller T configured as described above, when the shift lever 17 is operated to the left and right, the slide gear 36 is slid on the shaft 30 through the movement of the shift shifter. When the slide gear 36 is positioned at the center of the case, the large gear G1 of the three-stage gear meshes with the large gear G4 of the countershaft 37 to become “second speed”, and the input shaft 30 rotates. Are sequentially transmitted to the input shaft 30, the large gear G1 on the slide gear 36, the large gear G4 on the counter 37 shaft, the counter shaft 37, the small gear G5 on the counter shaft 37, and the flat gear G7 on the first shaft 32. Further, it is transmitted to the spline gear G9 of the first shaft 32, the flat gear G8 of the second shaft 33, the second shaft 33, and the chain 38, and is transmitted to the differential mechanism 34 and the axles 4 and 4.

  When the slide gear 36 is positioned slightly on the right side (solid line portion in the figure), the medium-diameter gear G2 and the flat gear G7 on the first 32-axis of the three-stage gear mesh with each other, The rotation of the input shaft 30 is sequentially transmitted to the input shaft 30, the intermediate gear G2 of the slide gear 36, and the flat gear G7 on the first shaft 32, and, similarly to the above, the spline gear G9 of the first shaft 32, It is transmitted to the flat gear G8 of the second shaft 33, the second shaft 33, and the chain 38, and is transmitted to the differential mechanism 34 and the axles 4 and 4.

  Further, when the slide gear 36 is further slid to the right side and is positioned at the innermost end in the case, the small-diameter gear G3 and the flat gear G8 on the second shaft 33 are engaged with each other among the three-stage gears. The rotation speed of the input shaft 30 is transmitted to the small gear G3 on the slide gear 36, the flat gear G8 of the second shaft 33, the second shaft 33, and the chain 38 in order, and the differential mechanism 34, axle 4 and 4.

Thus, the traveling system transmission mechanism L1 is configured to switch the vehicle speed in three stages including the reverse speed.
The slide gear 36 is slid through the movement of the travel shifter by operating the shift lever 17 shown in FIG. 3 to the left and right along the upper side of the guide hole 23A. .

  Further, the work system transmission mechanism L2 configured in the transmission case C second case portion of the tillage device T is provided with the input shaft 30 and the transmission shaft 31, and two transmission shafts (third shaft 40 in order from the top of transmission). And the fourth shaft 41), the tilling shaft 2, and a gear, a chain and the like meshing between the shafts.

  More specifically, the case input portion of the input shaft 30 is provided with a spline gear G10, and the slide gear 42 having the large and small two-stage gears G11 and G12 is supported on the transmission shaft 31. The third shaft 40 includes two flat gears G13 and G14, and is configured to always mesh with one gear G14 and the flat gear G15 on the fourth shaft 41 side. Further, the fourth shaft 41 and the tilling shaft 2 are configured to always transmit via the chain 43.

  In the work system transmission mechanism L2 of the first cultivator T configured as described above, when the shift lever 17 is operated to the left and right, the slide gear 42 is slid on the shaft 31 through the movement of the work shift shifter. Monkey. When the slide gear 42 is positioned at the inner end of the case, the large-diameter gear G11 and the flat gear G13 of the third shaft 40 of the two-stage gears mesh with each other to be "reverse rotation", and the input shaft 30 Of the input shaft 30, the spline gear G10, the large diameter gear G11, the flat gear G13 of the third shaft 40, the third shaft 40, the flat gear G14 of the third shaft 40, the flat gear G15 of the fourth shaft 41, It is transmitted to the fourth shaft 41, the chain 43, and the tilling shaft 1.

  When the slide gear 42 is positioned at the center of the case, the small-diameter gear G12 and the flat gear G15 of the fourth shaft 41 of the two-stage gears mesh with each other, resulting in “forward rotation” and the rotation of the input shaft 30. Are sequentially transmitted to the input shaft 30, the spline gear G10, the small diameter gear G12, the flat gear G15 of the fourth shaft 41, the fourth shaft 41, the chain 43, and the tilling shaft 1.

Thereby, in the work type transmission mechanism L1 of the first form, the tilling shaft 2 and the tilling claw 1 attached thereto are forwardly rotated or reversed.
The slide gear 42 is slid through the movement of the work shift shifter by operating the shift lever 17 shown in FIG. 3 to the left and right along the lower side of the guide hole 23A. .

Moreover, the recessed parts 44 and 45 of the transmission case C in the said FIG. 7 show the bearing support part in case the transmission case C is comprised in a 2nd form.
Next, based on FIG. 8, it demonstrates about the transmission structure of the walking type tiller of said 2nd form. The traveling system transmission mechanism L1 of the second form is the same as the traveling system transmission mechanism of the first form, and the description thereof is omitted.

  The field cultivator T of the second form has a so-called partial reversal type tiller that reverses the left and right bases of the tiller shaft 1, and this work system transmission mechanism L2 is connected to the second case part C2 with the third shaft. 40 to the seventh shaft 53 and gears and chains between the respective shafts, and further, the rotation is branched from the seventh shaft 53 to the forward rotation shaft 1a and the reverse rotation shaft 1b.

  Specifically, the structure includes the large and small two-stage gears G16, G17 and the transmission flat gear G18 on the third shaft 40, and the flat gear G19 that meshes with the flat gear G18 on the fourth shaft 41. It has become. In addition, a chain 51 is bridged between the fourth shaft 41 and the fifth shaft 50, and between the fifth shaft 50, the sixth shaft 52, and the seventh shaft 53, constant meshing gears G20 to G22 are provided. It is configured to be equipped. The seventh shaft 53 has a structure in which the chains 55a and 55b are bridged on both the left and right sides, and the rotation of each chain 55a and 55b is transmitted to the reverse rotation shaft 1b that rotates around the normal rotation shaft 1a.

  In the work system transmission mechanism L2 of the field cultivator T of the second form configured as described above, when the shift lever 17 is operated to the left and right, the slide gear 42 is slid on the shaft 31 through the movement of the work shift shifter. To do. When the slide gear 42 is positioned at the inner end of the case, the large-diameter gear G11 and the flat gear G16 of the third shaft 40 mesh with each other to become “second speed”, and the rotational power is sequentially input to the input shaft 30, Spline gear G10, large-diameter gear G11, flat gear G16 on third shaft 40, third shaft 40, flat gear G18 on third shaft, flat gear G19 on fourth shaft 41, fourth shaft 41, chain 51, first shaft The transmission is transmitted to the fifth shaft 50, the fifth shaft flat gear G20, the sixth shaft 52 flat gear G21, the sixth shaft 52, and the seventh shaft 53 flat gear G22. Power is transmitted to the reverse rotation shaft 1b via the seventh shaft 53 and the chains 551 and 55b.

  When the slide gear 42 is positioned at the center of the case, the small-diameter gear G12 and the flat gear G17 of the third shaft 40 mesh with each other to become "first speed", and the rotational power is in turn the input shaft 30, the spline gear G10. , Small gear G12, flat gear G17 on the third shaft 40, third shaft 40, flat gear G18 on the third shaft, flat gear G19 on the fourth shaft 41, fourth shaft 41, chain 51, fifth shaft 50, Transmission to the fifth shaft flat gear G20, the sixth shaft 52 flat gear G21, the sixth shaft 52, and the seventh shaft 53 flat gear G22 is transmitted to the forward rotation shaft 1a via this flat gear G23. At the same time, power is transmitted through the seventh shaft 53 to the reverse shaft 1b through the chains 551 and 55b.

Thereby, in the work type | system | group transmission mechanism L2 of a 2nd form, forward / reverse each tilling shaft 1a, 1b can be switched between high and low two steps.
Similarly to the above, the position of the slide gear 42 is configured to slide through the movement of the work shift shifter by operating the shift lever 17 shown in FIG. 3 to the left and right along the lower side of the guide hole 23A. It has become.

  Further, when the transmission case is configured as described above, the forward and reverse tilling shafts 1a and 1b may be reversely rotated as another form, or the tilling shaft 1 is inclined in an inverted V shape. You may comprise a part. Moreover, it is good also as a structure which switches the tilling axis | shaft 1 to several steps in a normal rotation direction. Moreover, it is good also as a structure which comprises separately the lower end part of the 2nd case part C2 manufactured with the said core, and connects with a bolt nut.

(A) Sectional drawing which shows the casting_mold | template of the lower case of a 1st form. (B) Sectional drawing which shows the casting_mold | template of the lower case of a 2nd form. The whole perspective view of a cultivator. The perspective view of a handle cover. The perspective view of a handle base. Sectional drawing of a grip part. The perspective view of a clutch lever. The power transmission mechanism figure in the gear case of a 1st form. The transmission mechanism figure in the gear case of a 2nd form. The enlarged view of a differential mechanism.

Explanation of symbols

B Mold B1a Main mold (mold)
B1b Main mold (mold)
B2a Core (mold)
B2b Core (mold)
B3a Core (mold)
B3b Core (mold)
E engine L1 traveling system transmission mechanism L2 working system transmission mechanism T cultivator 1 tilling claw 2 tilling shaft 3 traveling wheel 4 axle

Claims (1)

The rotational power of the engine (E) is transmitted to the tilling shaft (2) that drives the tilling claw (1) via the work machine system transmission mechanism (L1), and the traveling wheels ( 3) In the walking type tiller that transmits to the axle (4) that drives, the transmission case (C) of the tiller, the first case part (C1) that houses the traveling transmission mechanism (L1), and the work A side case “F” -shaped single case having a second case part (C2) for internally enclosing the system transmission mechanism (L2), and the lower end part of the second case part (C2) with a different mold A transmission case for a walk-type field cultivator, characterized in that a different form of tillage shaft transmission mechanism (L1a, L1b,...) Is formed by changing the lower end formed or formed separately.

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