JPH0551002U - Center drive type tiller - Google Patents

Abstract

(57) [Summary] [Purpose] A washer in which a tubular shaft that is fitted to the rotary shaft protruding from the transmission case so that torque can be transmitted is arranged at the outer end of the tubular shaft.
In addition, in the center drive type tiller which is inserted in the inner space of the cylinder shaft and fixed in a retaining state via bolts fixed to the rotary shaft, loosening of the bolts is suppressed. [Structure] A bolt 5 fixed to the rotary shaft 2 through an inner space of the cylindrical shaft 3 is abutted on the rotary shaft 2 by a step 5a.
The washer 4 is rotatably supported by the bolt 5 while being tightened and fixed in a predetermined posture via.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a walking-type or riding-type center drive type tiller, and more particularly, to a retaining structure for a tubular shaft for attaching a tilling claw that is externally fitted to a rotating shaft protruding from a transmission case so that torque can be transmitted.

[0002]

[Prior Art]

 Conventionally, when mounting a tubular shaft for mounting a plowing pawl on a rotary shaft protruding from the transmission case in a state where it is not pulled out, for example, as disclosed in Japanese Utility Model Laid-Open No. 63-89704, torque is applied to the rotary shaft of the transmission case. A tubular shaft for mounting a tillage claw that is fitted so as to be able to be transmitted is attached to the abutment plate member as a washer that is arranged at the outer end of the tubular shaft, and a bolt that penetrates the internal space of the tubular shaft. The member was pressed against the outer end of the cylinder shaft to be fixed.

[0003]

[Problems to be solved by the device]

 Since there is a fitting tolerance between the rotary shaft and the cylinder shaft, work load causes play in the rotation direction due to the fitting tolerance, and the play is transmitted to the bolt via the abutment plate member as a washer. There is an inconvenience that the bolt loosens and you come across an unexpected accident. An object of the present invention is to suppress the looseness of the bolt by devising a retaining structure for the tubular shaft of the rotary tiller.

[0004]

[Means for Solving the Problems]

 A characteristic configuration of the present invention for achieving the above-mentioned object is that a rotary shaft projecting from a transmission case is externally fitted onto a rotary shaft projecting laterally outward of the rotary shaft for mounting a tilling pawl so that torque can be transmitted. A center drive type tiller, in which this cylinder shaft is attached in a retaining state through a washer arranged at the outer end portion of the cylinder shaft and a bolt fixed to the rotary shaft by being inserted through the inner space of the cylinder shaft. In the device, the bolt is fastened and fixed to the rotary shaft through a contact step portion in a predetermined posture, and the washer is rotatably supported by the bolt.

[0005]

[Action]

 As shown in FIG. 1, since the clearance L is formed between the outer end surface of the cylinder shaft 3 and the washer 4, the outer end surface of the cylinder shaft 3 and the washer 4 rarely come into contact with each other, Further, since the bolt 5 is allowed to rotate slightly in the circumferential direction, even if the washer 4 contacting the outer end surface of the cylinder shaft 3 receives a rotational force in the circumferential direction via the cylinder shaft 3, Slip between the end surface of the shaft 3 and the washer 4 or between the washer 4 and the inner surface of the bolt 5 is prevented from being transmitted to the bolt.

[0006]

[Effect of the device]

 As a result of the above configuration, loosening of the bolt can be suppressed and an accident can be avoided.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to a retaining structure for a tubular shaft for mounting a tilling claw of a center drive type tilling device. As shown in FIG. 1, in the rotary cultivator R, a cylindrical shaft 3 provided with a hexagonal hole is externally fitted to a hexagonal rotary shaft 2 protruding from a rotary case C as a transmission case, and the rotary shaft 2 A washer 4 arranged at the outer end portion of the cylinder shaft 3 projecting laterally outwardly of the shaft is inserted through the inner space of the cylinder shaft 3 with respect to the rotary shaft 2, and the outer end portion of the cylinder shaft 3 and the washer are 4 is attached via a stepped bolt 5 having an abutment step portion 5a capable of forming a clearance L between them and the cylinder shaft 3 so as to prevent the cylinder shaft 3 from coming off in the axial direction. In this manner, the stepped bolt 5 which is tightened and fixed in a predetermined posture through the contacting step portion 5a allows the washer to be formed in the axial direction with respect to the bolt 5. As shown in FIG. 1, the rubber cover 7 attached to the inner surface of the side cover 6a of the rotary cover 6 for preventing the adhesion of mud has a locking section 7a formed in the outer peripheral edge and having a concave cross-sectional shape. When the rotary cover 6 is externally fitted and locked to the plate 8 and the rotary cover 6 is attached to the inner surface of the side cover 6a through the hollowed plate 8, the rubber cover 7 is vibrated by the vibration of the machine body. There is a suppression of mud adhesion to the. Further, a rubber cover 9 is attached to the inner surface of the upper portion of the rotary cover 6 to prevent the attachment of mud.

[Other Embodiments] In constructing a contact step portion for tightening the bolt in a predetermined posture with respect to the rotary shaft, as shown in FIG. 3, a collar is externally fitted to the straight bolt 5 to contact the contact step portion. You may comprise the part 5a.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a partially cutaway rear view showing a cultivator.

[Figure 2] Side view of the tiller

FIG. 3 is a cross-sectional view of a main part showing another embodiment.

[Explanation of symbols]

 2 Transmission case 3 Cylindrical shaft 4 Washer 5 Bolt 5a Contact step C Transmission case

Claims (1)

[Scope of utility model registration request] 1. A rotary shaft (2) projecting from a transmission case (C) is laterally outwardly projected from the rotary shaft (2) so that a tubular shaft (3) for mounting a plowing pawl can be externally transmitted with torque. Fit,
A washer (4) in which the cylindrical shaft (3) is arranged at the outer end of the cylindrical shaft (3), and a bolt fixed to the rotary shaft (2) through the inner space of the cylindrical shaft (3). A center drive type cultivator mounted via a (5) in a retaining state, wherein the bolt (5) is brought into a predetermined posture via a contact step (5a) with respect to the rotary shaft (2). A center drive type tiller which is fastened and fixed, and in which the washer (4) is rotatably supported by the bolt (5).