JP2787030B2 - Agricultural work machine clutch operation structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission clutch operating arm and a manual operating lever which are linked via a release wire and urged inward by an urging mechanism. The present invention relates to a clutch operation structure of an agricultural work machine provided with an automatic clutch for forcibly moving a clutch operation arm from an on position to an off position. 2. Description of the Related Art As a clutch operating structure of this kind of agricultural working machine, the present applicant has previously filed an application (Japanese Utility Model Application No. 62-39).
No. 84), the clutch operation arm and the manual operation lever are linked via a release wire, and a spring as a mechanism for urging the clutch operation arm to the inward side is connected to the manual operation lever. It was provided between the release wire. [0003] As described above, in the case where the release wire and the spring are interposed in series,
As shown by the imaginary line in FIG. 5, it is necessary to output a required clutch operating force P at a predetermined elongation λ1 from a free state (biasing force = 0), and a large spring constant k1 is required. Therefore, in the on state in which the clutch operating force P appears ,
When the clutch disengaging operation force is applied to the spring by the automatic clutch mechanism against the spring in conjunction with the upward swing of the pre-processing device , the spring expands λ, and the clutch disengaging urging force P2 by the spring increases. It becomes large according to the constant k1. Therefore, the force acting on the wire and other members applied to the auto clutch mechanism becomes excessive, and the strength must be improved more than necessary. An object of the present invention is to rationally select an installation position of an urging mechanism with respect to a clutch operation arm, and to forcibly disengage a clutch by an automatic clutch mechanism so that the urging force of the urging mechanism is the same as that of the conventional configuration. The point is to provide a product that can be made smaller than a product. A feature of the present invention is that one of an inner end and an outer end of a release wire having one end connected to a manual operation lever is connected to a clutch operation arm and the other is connected to a clutch operation arm. Attaching the biasing mechanism to the relay swing arm so as to swing the relay swing arm such that the inner end and the outer end are separated by the biasing force of the biasing mechanism; The point of connection, the point of providing a swing limit of the relay swing arm to prevent the action of the biasing mechanism below the set biasing force, and the relay swing arm when the auto clutch mechanism is disengaged. Is linked to a relay swing arm so that the automatic clutch mechanism swings toward the clutch operation arm side. The operation and effect are as follows. [Operation] From the characteristic configuration, as shown in FIGS. 1 and 5, a spring as the urging mechanism 23 is given an initial urging force P0. First, as shown in FIG. 1, here, the manual operation lever 19 is moved to the initial urging force P0. In response to this, the clutch operating arm 15 is engaged because the inner wire end 21c is pulled, and the relay swing arm 22 which is in the swing limit by the spring 23 in the initial urging force P0 is moved to the outer side. It is pushed by the end 21d and swings in a direction approaching the clutch operation arm 15. Then, the spring 23 is pulled and the clutch operating force P appears. From this state, as shown in FIG. 2, when the auto clutch mechanism 25 operates in the clutch disengagement direction, the inner wire end 29 a of the release wire as the linking tool 29 constituting the auto clutch mechanism 25 is pulled, so that The relay swing arm 22 is swung in a direction in which the outer end 21d on the opposite side approaches the clutch operation arm 15, and the clutch operation arm 15 is returned to the clutch disengaged position. At this time, the spring 23 is further operated to pull out the urging force P1.
That is, the manual operation lever 19 and the clutch operation arm 15
By providing the relay swing arm 22 in the linkage mechanism with the relay mechanism, the urging mechanism 23 can be linked to the relay swing arm 22, and the linkage between the manual operation lever 19 and the clutch operation arm 15 as in the characteristic configuration. Initial tension can be set without affecting the mechanism. Therefore, the spring constant k2 may be smaller than the conventional spring constant k1 for producing the same clutch operating force P. As shown in FIG. 5, for this reason, the spring urging force P1 is actuated by the operation of the auto clutch mechanism 25 from the clutch engaged state. Is larger than the urging force P corresponding to the clutch engagement state, but can be smaller than P2 in the conventional case. [Effects of the Invention] As a result, the urging force acting on the clutch operating arm and the like can be reduced, and the structure can be advantageously deployed in terms of strength . DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1, 2, and 4, a pre-cutting device A having a raising device 1, a cutting device 2, a vertical transport device 3, etc. The main frame (4) is mounted on the main frame 4 in a posture, and the main frame (4) is mounted on the rear end so as to swing up and down with respect to a horizontal support shaft X provided at the front end on the fuselage side. The threshing device 5 and the driver's seat 6 are located on the side of the machine body behind the vertical transport device 3 and on the side of the vertical transport device 3.
Are arranged to form a combine. As shown in FIGS. 1 and 2, an engine and a transmission case 8 as a driving unit 7 are arranged at the front end of the fuselage, and a first belt transmission mechanism 9 is installed between an engine output shaft 7a and a transmission input shaft. In addition, a second belt transmission mechanism 11 is provided between the engine output shaft 7a and the threshing input shaft 10. On the other hand, the mowing device 2 and the raising device 1
A transmission shaft 12 for supplying a driving force to the transmission shaft is provided, and the transmission shaft 12 is operatively connected to the lateral support shaft X. The lateral support shaft X is provided with an input pulley 13 at a shaft end thereof and is provided between the transmission shaft and the transmission case 8 side output shaft. The third belt transmission mechanism 17 is provided with the power supply. The third belt transmission mechanism 17 is provided with a clutch operation arm 15 that supports a tension pulley 14.
6 are constituted. Similarly, a tension-type threshing clutch 1 having a clutch operation arm 18A supporting a tension pulley for the second belt transmission mechanism 11 is also provided.
8 are provided. The reaping clutch 16 is provided with the following operation mechanism. A manual operation lever 19 is provided on the lateral side of the driver's seat 6.
Takes a configuration linked to the manual operation lever 19 via a first release wire 21. A relay swing arm 22 is provided in the middle of the link. That is, the inner end 21a of the first release wire 21 is connected to the manually operated lever arm 19A.
, The outer end 21b is fixed, the inner end 21c at the other end is connected to the clutch operation arm 15, and the outer end 21d is connected to the relay swing arm 2.
It is fixed to 2. The relay swing arm 22 is provided with a spring as a biasing mechanism 23 for biasing the reaping clutch 16 toward the input side, and swings the relay swing arm 22 in a direction away from the clutch operation arm 15. An urging force is applied to make it work. Moreover, the relay swing arm 22
In contrast, a swing limit a is provided in a direction away from the clutch operation arm 15, and a stopper pin 24 is provided to make the swing limit a appear. The swing limit a sets the spring 23 to a length at which the initial tension appears. Therefore, a constant initial tension acts on the relay swing arm 22 at the swing limit a position, and a larger tension acts on the relay swing arm 22 as the clutch swings toward the clutch operation arm 15 side. Here, when the manual operation lever 19 is operated to the input side, first, the clutch operation arm 1 is moved by the inner wire.
5, the clutch operation arm 15 switches the mowing clutch 16 to the engaged state, and the relay swing arm 22 is pushed by the outer end 21d and swings toward the clutch operation arm 15 side. Then, the spring 23 is pulled, and a biasing force for biasing the reaping clutch 16 appears. The reaping clutch 16 is provided with an auto clutch mechanism 25 for forcibly disengaging the reaping clutch 16 from the engaged state by the upward swing of the pre-cutting device A, which will be described below. As shown in FIG. 3, a drive arm 26 for the clutch operation arm 15 is pivotally supported on a lateral side surface of the driver's seat 6 which avoids interference with the vertical transport device 3 so as to be vertically swingable. The drive arm 26 includes a roller 26A that contacts and follows a cam mechanism 27 described later, an arm 26B that supports the roller 26A, and a horizontal support shaft 26C to which the arm 26B is fixed. By linking a transmission arm 28 fixed to one end of the shaft 26C to the relay swing arm 22 via a second release wire as a linking tool 29, the reaping clutch 16
It is linked to As shown in FIG. 1 and FIG.
An inner end 29a at one end of the release wire 29 is connected to the transmission arm 28 through a connection fitting 30 having a long hole.
And the outer end 29b is fixed,
An inner end 29c at the other end of the release wire 29 is fixed, and an outer end 29d is connected to the relay swing arm 2.
2 are connected. At this time, a lateral transmission case 31 for the mowing device 2 is fixed to the front end of the main frame 4, and a support frame 32 connected to the rear surface of the raising device 1 located further forward than the lateral transmission case 31.
Has been erected. A cam mechanism 2 acting on the roller portion 26A of the drive arm 26 on the upper surface of the support frame 32
7 is fixed. The cam mechanism 27 has a cam surface 27A for obtaining a step required for the disengagement operation of the reaping clutch 16 and a circular arc surface centered on the horizontal support shaft X below the cam surface 27A for obtaining a step required for the disengagement operation of the reaping clutch 16 from the upper end side. 27B, and
After the clutch 16 is disengaged, the drive arm 26 does not substantially swing because the roller portion 26A is along the arc surface 27B. When the drive arm 26 is pivoted upward by the cam surface 27A, the relay pivot arm 22 is pivotally driven to the clutch operation arm 15 side. The operation arm 15 returns to the clutch off position. As described above, the automatic reaping clutch operating mechanism 25 that automatically turns on and off the reaping clutch 16 as the pre-cutting device A moves up and down.
Is configured. [Another embodiment] a. The above-described transmission clutch is a reaping clutch 1.
The present invention is not limited to 6, and is applicable as long as the manual operation mechanism and the automatic clutch mechanism are used in combination. The present invention is not limited to the combine, and can be applied to a clutch used for an agricultural work machine. B. The clutch operation arm 15 and the drive arm 26 may be linked by a connecting rod or the like, and the linking tool 29 is not limited to a wire. C. The urging mechanism 23 is not limited to a single spring but may be a plurality of springs, or a combination of a spring and another mechanism (such as a wire or a damper). D. The arm portion 26B of the drive arm 26 is composed of a tip end supporting the roller portion 26A and a base end portion extending and supporting the tip end, so that the relative positional relationship between the cam mechanism 27 and the roller portion 26A can be finely adjusted. A configuration may be adopted. 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 a side view showing a cutting clutch before an automatic clutch mechanism is activated. FIG. 2 is a side view showing a cutting clutch after an automatic clutch mechanism is activated. Front view of arm [FIG. 4] Plan view of cutting pre-processing device [FIG. 5] Graph showing spring characteristics of biasing mechanism for cutting clutch [Description of symbols] 15 Clutch operating arm 19 Manual operating lever 21 Release wire 21c Inner end 21d Outer end 22 Relay swing arm 23 Urging mechanism 25 Auto clutch mechanism 29 Coupler A Cutting pretreatment device a Swing limit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) A01D 34/00-34/28 A01D 69/00 F16D 23/12

Claims (1)

(57) Claims The transmission clutch operating arm (15) and the manual operating lever (19) are linked via a release wire (21), and are urged inward by an urging mechanism (23). Of the clutch operating arm (15) that has been cut,
A clutch operating structure of an agricultural work machine provided with an auto clutch (25) forcibly moving from an on position to an off position in conjunction with the upward swing of the release wire having one end connected to a manual operation lever (19). Either the inner end (21c) or the outer end (21d) at the other end of the clutch operating arm (1).
5) Attach the other end to the relay swing arm (22) and apply the urging force of the urging mechanism (23) to the inner end (2).
1c), the urging mechanism (23) is connected to the relay swing arm (22) so as to swing the relay swing arm (22) so that the outer end (21d) is separated from the outer swing end (21d);
When the swing limit (a) of the relay swing arm (22) is provided to prevent the action of the biasing mechanism (23) below the set biasing force, and the auto clutch mechanism (25) is disengaged, In order to swing the relay swing arm (22) toward the clutch operation arm (15), a linkage (29) constituting the auto clutch mechanism (25) is linked to the relay swing arm (22). Agricultural work machine clutch operation structure.