JP3530572B2 - Moore - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bevel gear mechanism in a bevel case in a bevel case mounted on an upper surface of a cutting blade housing from a traveling machine body via a joint shaft. And a mower for driving a center blade shaft in the cutting blade housing by the output shaft of (1). 2. Description of the Related Art In a conventional mower, Japanese Utility Model Laid-Open No. 5-4
As disclosed in Japanese Patent No. 3817, the output shaft of the bevel gear mechanism and the center blade shaft in the cutting blade housing are integrally formed. [0003] In the mower, there is a disadvantage that vibration caused by high-speed rotation of the universal joint and micro-vibration caused by the engagement of the bevel gear mechanism are transmitted to the cutting blade housing via the bevel case and the support stay. . Therefore, as disclosed in Japanese Utility Model Laid-Open No. 4-77727, a structure is adopted in which the bevel case is attached to the cutting blade housing via a vibration-proof rubber so that the vibration of the bevel case is not transmitted to the cutting blade housing. I have. In the structure described in Japanese Utility Model Laid-Open Publication No. 4-77727, vibration transmitted from the bevel case to the cutting blade housing via the support stay can be suppressed.
The vibration transmitted from the output shaft of the bevel gear mechanism, that is, the center blade shaft to the cutting blade housing via the bearing holder cannot be suppressed, and there is room for improvement. Therefore, as a means for solving the above-mentioned inconvenience, it is conceivable to mount the bearing holder on the cutting blade housing via a vibration isolating rubber. There is an inconvenience that changes the interval and induces the belt to slip. SUMMARY OF THE INVENTION It is an object of the present invention to suppress transmission of vibration of an output shaft of a bevel gear mechanism to a cutting blade housing without causing slippage of a belt, and to more effectively suppress vibration of a bevel case. And According to a first aspect of the present invention, there is provided a mower having blades mounted on lower ends of a center blade shaft and a side blade shaft in a cutting blade housing, respectively. An output pulley is mounted on the center blade shaft in an upper position, and an input pulley is mounted on the side blade shaft, and a belt is wound around the output pulley and the input pulley, and attached to the upper surface of the cutting blade housing. In the mower that drives the center blade shaft and the side blade shaft by the driving force input to the output shaft of the bevel case, the bearing holder of the center blade shaft is directly fixed to the cutting blade housing, and the bevel case is Attached to the upper surface of the cutting blade housing separately from the bearing holder via an elastic body, The output shaft of the case and the center blade shaft are interlockingly connected via an elastic coupling. According to the first aspect of the present invention, the minute vibration caused by the engagement of the bevel gear mechanism is absorbed by the elastic coupling, so that the minute vibration caused by the engagement of the bevel gear mechanism is not transmitted to the center blade shaft. According to the first aspect of the present invention, the vibration transmitted from the bevel case to the cutting blade housing is also suppressed by the vibration of the blade shaft and transmitted from the blade shaft to the cutting blade housing via the bearing holder. In addition, it is possible to avoid the inconvenience that the center blade shaft swings and the distance between the center blade shaft and the side blade shaft changes to induce belt slippage. Then, noise caused by the bite of the bevel gear mechanism is suppressed, and a quiet harvesting operation in a residential area becomes possible. An embodiment of the present invention will be described below with reference to a mid-mount type riding lawn mower having a mower M mounted between a front wheel 1 and a rear wheel 2. As shown in FIG. 1, a mower M is provided between a front wheel 1 and a rear wheel 2 of a traveling body A via a link mechanism R.
From the mid PTO shaft 4 projecting from the transmission case 3 to the bevel gear mechanism 6 in the bevel case B attached to the upper surface of the cutting blade housing Ma via the transmission shaft 5 having the universal joint. It is transmitting. As shown in FIGS. 2 and 3, the mower M is a three-blade type mower M in which three blades Mb are housed in a cutting blade housing Ma, and is driven by an output shaft 6a of a bevel gear mechanism 6. The belt 8 is wound around an output pulley 7A attached to the center blade shaft 7a and an input pulley 7B attached to both lateral side blade shafts 7b. The blade shaft 7b is driven. As shown in FIG. 4, the bevel case B is connected to the cutting blade housing Ma via a pair of left and right case support stays 9.
It is attached to the upper surface of. The bevel case B is supported on the case support stay 9 via a vibration-proof rubber 10 as an elastic body. The rubber cushion 10 is provided between the outer collar 10a and the inner collar 10b.
Is fixed to the structure. The outer diameter of the outer collar 10a is substantially the same as or slightly larger than the inner diameter of the fitting hole formed in the case support stay 9, and the inner diameter of the inner collar 10b is the same as or substantially equal to the outer diameter of the fixing bolt 11. They have the same diameter. As shown in FIG. 3, the center blade shaft 7a
The bearing holder 12 that rotatably supports the blade housing Ma is directly fixedly connected to the cutting blade housing Ma via bolts 13, and the cutting blade housing Ma is prevented from being wound around the bearing holder 12. Is provided with a cover 14 for preventing cutting grass wrapping. As shown in FIGS. 3, 4 and 5, the output shaft 6a of the bevel gear mechanism 6 and the center blade shaft 7a supported by the bearing holder 12 are elastic cups which allow relative displacement between the rotational shafts of the two. They are linked and connected via a rubber coupling C as a ring. [First Alternative Embodiment] In supporting the bevel case B on the case supporting stay 9 in a vibration-proof manner, the vibration-proof rubber 10 is fitted into a hole b provided in the bevel case B as shown in FIG. The left and right anti-vibration rubbers 10 may be fixed via one fixing bolt 11. [Second Alternative Embodiment] In supporting the bevel case B against vibration, as shown in FIGS. 7 and 8, the bevel case B is attached to a pair of left and right support arms 9 which are long in the front-rear direction and serve as support stays. Thus, a vibration-proof rubber 10 may be provided between the support arm 9 and the cutting blade housing Ma. [Third Alternative Embodiment] In FIGS. 7 and 8, the anti-vibration rubber 10 may be attached to the cutting blade housing B sideways as shown in FIG. 9. In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall side view of a riding lawn mower. FIG. 2 is an overall plan view of a mower. FIG. 3 is a longitudinal side view near a bevel case. FIG. 4 is a rear view near a bevel case. FIG. 5 is a cross-sectional plan view of a rubber coupling. FIG. 6 is a plan view showing an anti-vibration support structure of a bevel case in a first alternative embodiment. FIG. 7 is an anti-vibration support of a bevel case in a second alternative embodiment. FIG. 8 is a plan view showing the structure. FIG. 8 is a cross-sectional view of the second alternative embodiment, taken along the line AA in FIG. 7. FIG. 9 is a longitudinal sectional front view showing a vibration-proof support structure of a bevel case in the third alternative embodiment. 6a Output shaft 7a Center blade shaft 7b Side blade shaft 7A Output pulley 7B Input pulley 8 Belt 9 Case support stay 10 Vibration-proof elastic body 10a Outer collar 10b Inner collar 10c Rubber 12 Bearing holder B Bevel Case C resilient coupling Ma cutting blade housing Mb blade

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 4-77727 (JP, U) JP-A-60-57931 (JP, U) JP-A 64-24919 (JP, U) JP-A 3- 111154 (JP, U) Hira 3-22143 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) A01D 34/63 A01D 34/64 A01D 34/76

Claims (1)

(1) A blade (Mb) is attached to each of lower ends of a center blade shaft (7a) and a side blade shaft (7b) in a cutting blade housing (Ma). An output pulley (7A) is mounted on the center blade shaft (7a) and an input pulley (7B) is mounted on the side blade shaft (7b) while being positioned on the upper surface of the housing (Ma).
The belt (8) is wound around the output pulley (7A) and the input pulley (7B), and the cutting blade housing (M
a) a mower that drives the center blade shaft (7a) and the side blade shaft (7b) by a driving force input to an output shaft (6a) of a bevel case (B) attached to the upper surface of (a); Bearing holder (1) for blade shaft (7a)
2) While fixing directly to the cutting blade housing (Ma),
The bevel case (B) is mounted on the upper surface of the cutting blade housing (Ma) separately from the bearing holder (12) via an anti-vibration body (10), and an output shaft (6a) of the bevel case (B). And a center blade and a center blade shaft (7a) interlockingly connected via an elastic coupling (C).