JP3238333B2 - Riding lawn mower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling body having front and rear wheels, an engine at a front portion, a hydraulic continuously variable transmission at a rear portion, and a mower at a middle position between the front and rear wheels so as to be movable up and down. More specifically, the present invention relates to an improved technology for transmitting power to a continuously variable transmission and a mower.

[0002]

2. Description of the Related Art Conventionally, there is a riding lawn mower constructed as described above as disclosed in Japanese Patent Application Laid-Open No. Hei 7-156672. In this conventional example, an attitude in which an input shaft of a continuously variable transmission projects forward. And a pulley that rotates integrally with the input shaft.
The belt is wound around the TO and the pulley provided on the coaxial core, and further, P
The provision of the TO clutch allows the power from the engine to be transmitted to the continuously variable transmission and, at the same time, to be transmitted to the mower via the belt transmission system and the PTO clutch.

[0003]

In the configuration described in the prior art, the input shaft of the continuously variable transmission is disposed at a relatively upper position, and the mid PTO with respect to the mower is disposed relatively at a lower position. From the transmission shaft to the continuously variable transmission, the space for raising the mower can be widely secured, and at the same time, the mid PT having a height close to the mower during operation.
The mower can be driven by the driving force from O.

[0004] However, in the structure of transmitting power from the engine directly to the input shaft of the continuously variable transmission as in the conventional example, the portion supporting the input shaft is easily damaged by the vibration of the engine. In particular, in a device having a belt transmission system for transmitting power from the input shaft to the mid PTO as described in the conventional example, the input shaft vibrates while the belt tension is constantly applied to the input shaft. Therefore, the input shaft portion is more likely to be damaged, and there is room for improvement.

An object of the present invention is to rationally construct a riding lawn mower which is unlikely to cause damage to an input shaft portion of a continuously variable transmission.

[0006]

[Action]

According to the first aspect of the present invention, the power from the engine is transmitted to the intermediate case, and is also transmitted to the continuously variable transmission and the mower via the intermediate case. As a result, unlike the conventional example, the vibration from the engine is not directly transmitted to the continuously variable transmission, and the input system of the continuously variable transmission is hardly damaged. Further, since the intermediate case and the continuously variable transmission are arranged separately in the front and rear with respect to the transmission case, the intermediate case and the continuously variable transmission are arranged in front of the transmission case. However, the mower is less likely to protrude forward than the rear wheels, and a large space for elevating the mower can be secured. Nothing at the top of the middle case
Providing an output for a continuously variable transmission,
Since the transmission system passes through the upper part of the transmission case, for example,
Output part for continuously variable transmission is provided at the lower part of the intermediate case
The transmission system to the continuously variable transmission at the bottom of the transmission case.
When traveling on uneven terrain, such as when passing
Can be prevented from contacting the convex portion of the ground. [Effect] According to the present invention, a riding lawn mower that is unlikely to cause breakage at a portion of an input shaft of a continuously variable transmission is rationally configured, and an intermediate case with respect to a transmission case. And the step-and-step transmission can be allocated widely without increasing the wheelbase. To continuously variable transmission when traveling on uneven terrain
To prevent the transmission system of the
Damage to the transmission system to the transmission can be prevented.

[0007]

[0008] The present invention described in claim 2, serial to claim 1
In the above , the entire intermediate case including the output portion for the mower is disposed above the lower surface of the transmission case, and the operation is as follows. According to the second aspect of the present invention, in addition to the first aspect, the entire intermediate case including the output portion to the mower is disposed above the lower surface of the transmission case. Therefore, when traveling on uneven terrain, it is possible to prevent the output portion to the mower from contacting the convex portion of the ground. [Effect] According to the present invention described in claim 2 , in addition to the effect described in claim 1, it is possible to avoid that the output portion to the mower comes into contact with the convex portion of the ground when traveling on uneven terrain. , Can prevent damage to the transmission system to the mower.

[0009] The present invention described in claim 3 is based on claim 1 or
2. The transmission case according to claim 2 , wherein the transmission case and the continuously variable transmission are integrated. [Operation] According to this configuration, it operates in the same manner as the invention according to claim 1 or 2 , and since the transmission case and the continuously variable transmission are integrated, the transmission case and the continuously variable transmission are separated from each other. It is possible to arrange them both closer to the front and rear than in the case where they are performed. [Effect] According to the third aspect of the present invention, the above-described effects of the first or second aspect of the present invention are provided, and the longitudinal length of the fuselage can be reduced by integrating the transmission case and the continuously variable transmission.

[0010] The present invention described in claim 4 provides the invention according to claims 1 to
In the device described in Item 3 , the intermediate case, the transmission case, and the continuously variable transmission are configured to be substantially fit within the outer diameter of the rear wheel in a side view. [Operation] According to this configuration, the intermediate case, the transmission case, and the continuously variable transmission are configured to substantially fit within the outer diameter of the rear wheel in side view, while operating in the same manner as the invention according to claims 1 to 3. As a result, the intermediate case is less likely to protrude forward than the rear wheels, and a wider mower elevating space can be secured. [Effect] According to the invention according to claim 4 , the above effects of the inventions according to claims 1 to 3 can be obtained, and the wheel base can be made shorter while the space for elevating and lowering the mower can be secured widely. Can be.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a link is provided between the front wheel 1 and the rear wheel 2 of a traveling body A having a steering wheel 4 and a driven rear wheel 2 and a steering wheel 4 and a driving seat 5. A mower M is provided so as to be able to ascend and descend freely via a mechanism R, a lawn grass collecting bag B is provided behind a traveling machine body A via a support frame 6, and a lawn grass cut with the mower M is provided at the center of a discharge duct D. A riding lawn mower that sucks through the suction fan F and collects the collected grass in the grass collecting bag B is configured.

As shown in FIG. 2, the traveling body A has an engine 7, a radiator 8, a battery 9, a muffler 10 and the like arranged in a hood at a front part of the body, and a transmission case 11 at a rear part of the body. Power from an output shaft 7a of the engine 7 is transmitted via a transmission shaft 12 to an input shaft 1 of an intermediate case 13 disposed at a front portion of the transmission case 11.
3a, and the power from the intermediate case 13 is transmitted via a transmission belt 14 to a hydrostatic continuously variable transmission 15 integrally formed at the rear of the transmission case 11, and Transmission power of transmission case 11
The rear wheel 2 is configured to be able to drive by transmitting to a differential device (not shown) inside.

The step of the traveling body A and the rear fender 16 are formed as an integral body, and the front end of the integral body has a horizontal support shaft 1 with respect to the body frame 18.
7, and a pair of left and right suspension springs 19 with respect to the body frame 18 at the rear end.
The driver seat 4 is supported at an intermediate position between the left and right rear fenders 16.

The link mechanism R for suspending and supporting the mower M comprises a front link 21 having a U-shape in plan view and a pair of left and right rear links 22 as shown in FIGS. A lifting and lowering operation arm 23 that can swing around a horizontal axis P, which is provided with a rear end swingably on both lateral sides of the traveling body;
When a single lifting lever 26 that is separately connected to the lifting arm 23 via a link interlocking mechanism 25 is swingably operated via a suspension link 24, the operation force is increased. In addition, when the left and right lifting operation arms 23, 23 swing up and down, the mower M can be raised and lowered via the suspension link 24, and is fixed to a position where the lifting lever 26 is operated by a lock mechanism (not shown). By holding the left and right lifting operation arms 23 and 23 so that the hanging link 24 is not lowered by the weight of the mower M, the left and right rear links 22 and 22 can be held at the position where the vertical movement is adjusted.

[0015] As shown in FIG.
3 and the body frame 1 which rotate integrally with the frame 3
A gas damper 29 for reducing operating force is provided across the bracket 28 provided on the bracket 8. The gas damper 29 has a 48-inch wide mower mounted on the link mechanism R and a
The mounting position with respect to the rotating arm 27 and the bracket 28 can be changed according to the size of the inch width mower. That is, the 48-inch mounting hole 27a, the 54-inch mounting hole 27b, and the 48.5
A 4-inch mounting hole 27c is provided. On the other hand, the bracket 28 is also provided with a 48-inch mounting hole 28a, a 54-inch mounting hole 28b, and a 48 / 54-inch mounting hole 28c.

As shown in FIG.
Is connected to the left and right members of the body frame 18 via a horizontal support plate 30 and fixed to the body frame 1.
8, an input shaft 13a is provided at an upper part of the front surface and projects forward, and an output shaft 32 is provided in the inside in a vertical position in which power from the input shaft 13a is transmitted via a bevel gear mechanism 31. In the upper position, a traveling output pulley 33 and a blower output pulley 34 are provided as output portions for transmitting power from the upper end of the output shaft 32 to the continuously variable transmission 15. A mower output pulley 36 as an output unit is provided via an electromagnetic clutch 35 so as to transmit power from the lower end of the output shaft 32 to the mower M. In addition, the electromagnetic clutch 35 is turned on when the intermediate case 1 is turned on.
The power from the motor 3 is transmitted to the mower M, and the mower M is electrically turned on and off so that the mower M can be stopped by shutting off the power to the mower M by the turning operation.

The continuously variable transmission 15 is provided with an input pulley 38, a working output pulley 39, and a cooling fan 40 on an input shaft 37 having a vertical posture. The input pulley 38 and the traveling pulley 33 are provided between the input pulley 38 and the traveling pulley 33. The transmission belt 14 is wound. The output pulley 3 of the intermediate case 13
The transmission bell over 6 and the input pulley 41 of mower unit M
G is wound. A transmission belt 43 is wound around the output pulley 34 of the intermediate case 13 and the input pulley 42 of the suction fan F.

As shown in FIG. 3, the mower M has three blades 45 therein rotatably about a longitudinal axis with respect to the cutting blade housing 44 and a blade 45 at a central position.
Input pulley 41 and drive pulley 48
The drive pulley 48 and the other two blades 4
The endless belt 52 is wound around the driving pulley 50 and the fixed tension pulley 51 provided on the rotary shaft 49 of the fifth rotary shaft 49, and the three blades 45 are driven by the power transmitted to the input pulley 41.
Are simultaneously driven. When the input pulley 41 and the drive pulley 48 are provided above the rotation shaft 46 of the central blade 45, the drive pulley 4
The structure can be simplified compared to a four-shaft structure in which the shaft 8 is provided separately from the rotating shaft 46.

With the above configuration, the power from the engine 7 is transmitted to the continuously variable transmission 15 via the intermediate case 13, so that the phenomenon of transmitting the vibration from the engine 7 directly to the continuously variable transmission 15 can be avoided. 15 can be reduced, and since the intermediate case 13 and the continuously variable transmission 15 are arranged in front and rear with respect to the transmission case 11, the intermediate case 13 is provided at the front of the transmission case 11. 13 and the continuously variable transmission 15, the intermediate case 13 is less likely to protrude forward than the rear wheels 2, and a large space for raising and lowering the mower M can be secured. Since an output portion for the continuously variable transmission 15 is provided at the upper part of the transmission 42, the transmission system to the continuously variable transmission 15 is prevented from contacting the ground when traveling on uneven terrain. Because the whole intermediate case 42 including the output portion of the M are disposed above the lower surface of the transmission case 11, an output unit to mower unit M during rough terrain can avoid making contact with the ground.

[Brief description of the drawings]

FIG. 1 is an overall side view of a riding lawn mower.

FIG. 2 is a side view of the traveling body.

FIG. 3 is a plan view showing a transmission system to the mower.

FIG. 4 is a partially longitudinal side view showing the transmission structure at the rear of the aircraft.

FIG. 5 is a side view showing a mounting structure of the gas damper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front wheel 2 Rear wheel 7 Engine 11 Transmission case 13 Intermediate case 15 Continuously variable transmission 33 Output part 36 Output part A Traveling body M Mower

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Nobuyuki Yamashita 64 Ishizukita-cho, Sakai City, Osaka Prefecture Inside Kubota Sakai Works Co., Ltd. (72) Inventor Yoshio 64 Ishizukita-cho, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd. In-house (72) Inventor Kazuaki Kurohara 64 Ishizukita-cho, Sakai City, Osaka Prefecture Inside Kubota Sakai Factory Co., Ltd. (72) Inventor Shogo Murakawa 64-Ishizukita-machi Sakai City, Osaka Prefecture Kubota Sakai Factory Co., Ltd. (72) Invention Person Hiroki Nagai 64 Ishizu-Kitamachi, Sakai City, Osaka Prefecture, Japan (72) Inventor Masatoshi Yamaguchi 64 Ishizu-Kitamachi, Sakai City, Osaka Prefecture, Japan Kubota Sakai Factory, Inc. (72) Inventor Mikio Yuki Sakai, Osaka Prefecture 64 Ishizu-Kitacho, Ishizu-shi Kubota Sakai Factory (72) Inventor Seiya Harada 64 Ishizukita-cho, Sakai-shi, Osaka Kubo Co., Ltd. Sakai Works (56) References JP-A-61-81724 (JP, A) JP-A-4-35027 (JP, U) JP-A-62-25222 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) A01D 34/412-34/90

Claims (4)

(57) [Claims] An engine is provided at a front portion of a traveling body having front and rear wheels, a transmission case supporting a rear wheel and a hydraulic stepless transmission are provided at a rear portion of the traveling body, and are provided at an intermediate position between the front and rear wheels. A riding lawn mower provided with a mower so as to be able to move up and down, provided with an intermediate case that transmits power transmitted from the engine to the continuously variable transmission and the mower, and the intermediate case is provided on a front side of the transmission case. Each of the continuously variable transmissions is disposed on a rear rear surface of a transmission case, and a lower portion of a vertically oriented output shaft provided in the intermediate case,
An output unit with a power transmission belt that transmits power to the mower side.
And an output section composed of
On the upper part, an input shaft in a vertical position provided in the continuously variable transmission.
Runs a transmission belt that transmits power to the input pulley
A riding lawn mower provided with an output section constituted by a row output pulley . 2. The riding lawn mower according to claim 1, wherein an entire intermediate case including an output portion for the mower is disposed above a lower surface of the transmission case. 3. The riding lawn mower according to claim 1, wherein the transmission case and the continuously variable transmission are integrated. Wherein said intermediate case, transmission case, riding lawn mower according to any one of claims 1 to 3 with a continuously variable transmission are configured to substantially fit within the outer diameter of the rear wheel in side view.