JP3719960B2 - Cutting mechanism seal structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, an operation shaft that is eccentric with respect to the support shaft is provided on a moving member that moves around the support shaft, and the movable blade reciprocates relative to the fixed blade in conjunction with the movement of the moving member around the support shaft. The present invention relates to a seal structure of a cutting mechanism in which the operating shaft is engaged with an engaging groove that reciprocally slides integrally with the movable blade through a bearing so as to be driven dynamically.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a sealing structure for a reaping mechanism as described above, for example, as disclosed in Japanese Patent Application Laid-Open No. 2000-201517, a disk body and a bearing are provided on the outer surface of a disk body that receives and supports an inner race of the bearing. By attaching a resin or metal lip material formed so as to seal between the outer race and the outer race, the intrusion of foreign matter such as chips into the bearing is prevented.
[0003]
[Problems to be solved by the invention]
However, according to the above prior art, since a dedicated lip material formed so as to prevent the entry of foreign matter into the bearing is provided, the manufacturing cost increases, and the lip material swells with long-term use. Since peeling easily occurs, there is room for improvement in terms of durability and reliability.
[0004]
An object of the present invention is to provide a durable and reliable seal structure for a cutting mechanism that can prevent foreign matter from entering a bearing over a long period of time while reducing the manufacturing cost.
[0005]
[Means for Solving the Problems]
[Constitution]
In order to achieve the above object, according to the first aspect of the present invention, the moving member that moves around the support shaft is provided with an operation shaft that is eccentric with respect to the support shaft, and the moving member has a portion around the support shaft. The operating shaft is engaged with an engaging member that reciprocates and slides integrally with the movable blade via a bearing so that the movable blade is reciprocally slidably driven with respect to the fixed blade in conjunction with the movement of the movable blade. In the seal structure of the reaping mechanism, the operation shaft or the retaining member is provided between the moving member or the operation shaft and the bearing, and between a retaining member and the bearing for preventing the bearing from being detached from the operation shaft. A disc spring that is externally fitted to the operating shaft or the retaining member is interposed in a state of going from the tool toward the outer race of the bearing . Between the first receiving surface that receives and supports the inner race of the bearing in the moving member and the stopper, and the second receiving surface that receives and supports the inner periphery of the disc spring in the moving member and the stopper. A step having a dimension larger than the thickness of the spring was formed.
[0006]
[Action]
According to the first aspect of the invention, due to the elasticity of each disc spring, the relative rotation of the bearing outer race with respect to each disc spring by the contact pressure with the engaging member, or the moving member of each disc spring accompanying the rotation of the outer race, The outer peripheral edge of each disc spring can be brought into close contact with the outer race of the bearing and the inner peripheral edge of the disc spring can be brought into close contact with the moving member, the operating shaft or the stopper while allowing relative rotation with respect to the operation shaft or the stopper. Become. Further, each disc spring follows the movement of the outer race in the tilt direction with respect to the operation shaft generated by the centering function of the bearing, so that the outer peripheral edge and the outer race are kept in close contact with each other.
[0007]
In other words, a smooth cutting operation can be obtained by effectively using a generally used disc spring without providing a dedicated member formed to prevent the entry of foreign matter such as chips into the bearing. However, it is possible to reliably prevent foreign matter from entering the bearing.
[0008]
It is also possible to enclose grease between the bearing and each disc spring, which makes it possible to smoothly rotate the outer race or disc spring of the bearing with less wear.
[0009]
[0010]
[0011]
According to the present invention according to the first aspect, even by increasing the contact pressure between the inner race and the first supporting surface of the bearing, the suppression force of the disc spring, the outer peripheral edge of each disc spring is bearing outer race In addition, the outer periphery of the bearing smoothly rotates relative to each disc spring by the contact pressure with the engaging member while the inner peripheral edge of the disc spring is in close contact with the moving member, the operating shaft or the retaining member, or the outer race. With this rotation, the disc spring can be maintained in a state of smoothly rotating relative to the moving member, the operation shaft, or the stopper. That is, the outer race of the bearing when the stopper is attached to the operating shaft, which occurs when the elastic force of the disc spring against the outer race of the bearing is increased as the contact pressure of the bearing against the inner race is increased. Therefore, it is possible to avoid the rotation failure of the bearing outer race and the reversal of the disc spring due to the excessively high elastic pressure of the disc spring against the disc spring.
[0012]
[effect]
Accordingly, it is possible to provide a durable and reliable seal structure for a cutting mechanism that can reliably prevent foreign matter from entering the bearing over a long period of time without impairing a smooth cutting operation while reducing the manufacturing cost. Became. While ensuring the assembly of the bearing to the operating shaft without any slack, it is possible to easily ensure a smooth cutting operation that can avoid wear between the bearing and the engaging member due to the rotation failure of the outer race, and to secure the inside of the bearing. It is now possible to provide a sealing structure for a cutting mechanism that can reliably prevent foreign matter from entering the ridge and is excellent in assembling, durability, and reliability.
[0013]
[Constitution]
According to a second aspect of the present invention, in the invention according to the first aspect , the disc spring is bent to prevent the disc spring from being reversed.
[0014]
[Action]
According to the second aspect of the invention, it is possible to prevent the disc spring from reversing due to contact or winding of other objects, and to secure a suitable sealing state by the disc spring.
[0015]
[effect]
Accordingly, it is possible to provide a seal structure for a cutting mechanism that is more excellent in terms of reliability and can more reliably prevent foreign matter from entering the bearing.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an overall plane of the harvesting mechanism 1 installed in the harvesting and conveying section of the combine, FIG. 2 shows an enlarged plane of the main part of the harvesting mechanism 1, and FIG. 3 shows a longitudinal side surface of the harvesting mechanism 1. In this cutting mechanism 1, a plurality of fixed blades 4 are arranged in a row in the left-right direction, which is the longitudinal direction of the receiving blade base 3, on a single receiving blade base 3 that is supported left and right by the cutting frame 2. The single knife bar 5 is mounted so as to slide in the left-right direction with respect to the receiving blade base 3 with its front end edge being slidably guided by the rear end edge of each fixed blade 4. A plurality of movable blades 6 are slid on the knife bar 5 in the left-right direction with respect to the fixed blade 4 as the knife bar 5 slides in a state where the movable blades 6 are arranged in a line in the left-right direction which is the longitudinal direction of the knife bar 5. And a guide plate 7 that slides and guides the rear end edge of the knife bar 5 and is movable. A plurality of knife clips 8 that hold the 6 toward the fixed blade 4 are mounted and fixed on the receiving blade base 3 at a predetermined interval in the left-right direction, and the vertical engagement groove 9A is formed. A single knife head 9 (an example of an engaging member) provided is fixed to a knife bar 5 together with a predetermined movable blade 6 to form a clipper shape.
[0017]
The engaging groove 9A of the knife head 9 is formed in a front-rear direction integrally formed in a state of being eccentric with respect to the support shaft 10 on a turntable 11 (an example of a moving member) that is driven to rotate about the support shaft 10 in the front-rear direction. The operation shaft 12 is engaged via a bearing 13 that is externally fitted to the operation shaft 12.
[0018]
That is, the mowing mechanism 1 is slidably driven in the left-right direction with respect to each fixed blade 4 together with the knife head 9 in conjunction with the rotation of the rotating disk 11 around the support shaft 10. The planted cereal is harvested.
[0019]
A balance weight 14 for stabilizing the rotation of the rotating disk 11 around the support shaft 10 is integrally formed on the rotating disk 11 on the opposite side of the operation shaft 12 across the support shaft 10.
[0020]
As shown in FIGS. 2 to 5, a stopper 15 for preventing the bearing 13 from coming off from the operation shaft 12 is connected to the operation shaft 12 via a bolt 16.
[0021]
A disc spring 17 is provided between the turntable 11 and the bearing 13 so as to be externally fitted to the large-diameter portion 12A of the operation shaft 12 from the operation shaft 12 toward the outer race 13A of the bearing 13. A disc spring 18 that is externally fitted to the small-diameter portion 15 </ b> A of the retaining member 15 is interposed between the retaining member 15 and the bearing 13 in a state from the retaining member 15 toward the outer race 13 </ b> A of the bearing 13.
[0022]
That is, since the disc springs 17 and 18 are interposed between the rotating disk 11 and the bearing 13 and between the retaining member 15 and the bearing 13, the elasticity of the disc springs 17 and 18, The relative rotation of the outer race 13A with respect to the disc springs 17 and 18 by the contact pressure with the engagement groove 9A of the knife head 9 or the rotating disc 11 or the stopper of the disc springs 17 and 18 accompanying the rotation of the outer race 13A. 15, the outer peripheral edges 17A and 18A of the disc springs 17 and 18 are used as the outer race 13A of the bearing 13, the inner peripheral edge 17B of one disc spring 17 is used as the rotary disc 11, and the other The inner peripheral edge 18 </ b> B of the disc spring 18 can be brought into close contact with the stopper 15, and each disc spring 17, 18 is generated by the alignment function of the bearing 13. Following the movement of the outer race 13A with respect to the operating shaft 12 in the falling direction, the outer peripheral edges 17A, 18A and the outer race 13A are maintained in close contact with each other, and as a result, the smooth cutting operation can be achieved. The entrance of foreign matter such as soil and chips can be reliably prevented.
[0023]
4 and 5, the large-diameter portion 12A of the operation shaft 12 and the small-diameter portion 15A of the retaining member 15 have a fitting width w that is larger than the thickness t of the disk springs 17 and 18 that are externally fitted. Accordingly, the first receiving surface 19 formed on the operating shaft 12 so as to receive and support the inner race 13B of the bearing 13 and the inner peripheral edge 17B of the disc spring 17 are rotated so as to receive and support the inner race 13B. A first receiving surface 21 formed between the second receiving surface 20 formed on the board 11 and the inner peripheral side of the retaining member 15 so as to receive and support the inner race 13B of the bearing 13; Dimensions w larger than the thickness t of the corresponding disc springs 17 and 18 between the second receiving surfaces 22 formed on the outer peripheral side of the stopper 15 so as to receive and support the inner peripheral edge 18B of the spring 18 With steps 23 and 24 It has become way.
[0024]
As a result, even if the contact pressure between the inner race 13B of the bearing 13 and the first receiving surfaces 19 and 21 is increased, the elastic force of the disc springs 17 and 18 is increased outside the disc springs 17 and 18. The peripheral edges 17A and 18A are in close contact with the outer race 13A of the bearing 13, and the inner peripheral edges 17B and 18B of the disc springs 17 and 18 are in close contact with the rotating disk 11 or the stopper 15, and the contact pressure with the engaging groove 9A of the knife head 9 is The outer race 13A of the bearing 13 rotates smoothly relative to the disc springs 17 and 18, or the disc springs 17 and 18 rotate smoothly relative to the turntable 11 or the stopper 15 as the outer race 13A rotates. It can be maintained in the state to do.
[0025]
In other words, the bearing 13 and the pair of disc springs 17 and 18 are externally fitted to the operation shaft 12, and the assembly of the bearing 13 to the operation shaft 12 is not loosened by simply assembling the stopper 15 with the bolt 16. While being sure, it is possible to obtain a smooth cutting operation capable of avoiding wear between the bearing 13 and the engagement groove 9A of the knife head 9 due to the rotation failure of the outer race 13A, and to prevent foreign matter from entering the bearing 13 Can be surely prevented from entering.
[0026]
The disc springs 17 and 18 are reinforced by heat treatment, so that the outer race 13A of the bearing 13 and the disc springs 17 and 18 rotate in fine mud particles. Even if it is in a state, the disc springs 17 and 18 are not damaged, and the disc springs 17 and 18 and the disc 11 or the retaining plate 11 are not removed between the bearing 13 and the disc springs 17 and 18 as they rotate. It is possible to more reliably prevent dirt particles and the like from entering the bearing 13 side from between the tool 15.
[0027]
[Another embodiment]
Hereinafter, other embodiments of the present invention will be listed.
(1) As a cutting mechanism, you may equip with a binder, a mower, etc.
(2) The moving member 11 may be a swinging arm that is driven to swing in the left-right direction around the vertical support shaft 10.
(3) The disc spring 17 may be interposed between the steering Sakujiku 12 and the bearing 13.
(4) The inner peripheral edges 17B and 18B of the disc springs 17 and 18 may be configured to be in intimate contact with the moving member 11 or the operation shaft 12 or the stopper 15 via a spacer or the like.
(5) In example embodiment the operating shaft 12 by fitted a spacer having a first supporting surfaces 19 and 21, the first supporting surface 19 and 21 for supporting receiving the inner race 13B of the bearing 13, the disc spring 17 Steps 23 and 24 having a dimension w larger than the thickness t of the corresponding disc springs 17 and 18 are formed between the second receiving surfaces 20 and 22 that receive and support the inner peripheral edges 17B and 18B. May be.
(6) Grease may be enclosed between the bearing 13 and the disc springs 17 and 18 so that the outer race 13A of the bearing 13 and the disc springs 17 and 18 can be smoothly rotated with less wear.
(7) As shown in FIG. 6, the disc springs 17 and 18 are bent to prevent the disc springs 17 and 18 from reversing due to contact or winding of other objects. You may enable it to ensure a suitable sealing state.
[Brief description of the drawings]
[Fig. 1] Overall plan view of the mowing mechanism [Fig. 2] Enlarged plan view of the main part of the mowing mechanism [Fig. 3] Vertical side view of the mowing mechanism [Fig. 4] Vertical side view of the main portion showing the structure of the seal portion [ FIG. 5 is an exploded perspective view showing the configuration of the seal part. FIG. 6 is a longitudinal side view of the main part showing the shape of the disc spring in another embodiment.
DESCRIPTION OF SYMBOLS 4 Fixed blade 6 Movable blade 9 Engagement member 10 Support shaft 11 Moving member 12 Operation shaft 13 Bearing 13A Outer race 13B Inner race 15 Stopper 17 Disc spring 17B Inner periphery 18 Disc spring 18B Inner periphery 19 First receiving surface 20 Second Receiving surface 21 First receiving surface 22 Second receiving surface 23 Step 24 Step t Thickness w Dimension

Claims (2)

An operating shaft that is eccentric with respect to the support shaft is provided on the moving member that moves around the support shaft, and the movable blade is reciprocally slidably driven relative to the fixed blade in conjunction with the movement of the moving member around the support shaft. In this way, the operating shaft is engaged with an engaging member that reciprocally slides integrally with the movable blade via a bearing, and a sealing structure for a cutting mechanism is provided.
Between the moving member or the operating shaft and the bearing, and between the retaining member and the bearing for preventing the bearing from coming off from the operating shaft, the outer shaft of the bearing is moved from the operating shaft or the retaining member. With a disc spring fitted to the operation shaft or the retaining member in a state of facing ,
Between the first receiving surface that receives and supports the inner race of the bearing in the moving member and the stopper, and the second receiving surface that receives and supports the inner periphery of the disc spring in the moving member and the stopper. A seal structure of a cutting mechanism in which a step having a dimension larger than the thickness of the spring is formed . The seal structure for a cutting mechanism according to claim 2, wherein the disc spring is bent to prevent the disc spring from being reversed .

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