JPH02104201A - Lower link connection structure - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lower link connection structure connected to the rear end of a tractor body.

(Prior Art) As a structure for connecting a lower link such as a three-point link mechanism to a tractor body, as shown in FIG. 4, a mounting plate (102) is welded to a lower link mounting pin (101), and a transmission case is attached. Fit the inner end of the mounting pin (101) into the insertion hole (104) formed in the mounting plate (103).
2) is bolted to the side of the transmission case (103) to attach the mounting pin (101), and the four parts of the lower link (105) are inserted and fitted onto the mounting pin (101). There was a structure.

(Problem to be Solved by the Invention) However, with the above connection structure, since the lower link mounting pin 101 has a cantilevered structure, there is a large possibility that the mounting pin 101 will bend.
In order to improve the strength of the 01, it was necessary to use high-strength materials, make it larger in diameter, and finish it by heat treatment, making it expensive.

Therefore, as shown in FIG.
The support wall 1 is attached to the brake case 106 mounted on the outside of the brake case 106
If the mounting pin 101 is provided with a double-supported structure in which both ends are supported by the mission case 103 and the support wall 107, bending of the mounting pin 101 can be effectively prevented. Since the support wall 107 is made of aluminum, there is a drawback that the base side of the support wall 107 is easily broken.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a lower link connection structure that is inexpensive and has excellent durability.

(Means for Solving the Problem) The technical means is that the lower link 12 is inserted and connected to lower link attachment bins 9 provided on both sides of the rear end of the transmission case 1 in an outwardly protruding manner. In the lower link connection structure, the inner end side of each lower link mounting bin 9 is fitted and supported in a fitting hole 11 formed in the transmission case 1, and an overhanging flange provided on the outer end side of each lower link mounting bin 9 is supported. The portion 1O is fixedly attached to the transmission system case 3 mounted on both outer sides of the transmission case 1, respectively.

(Function) According to the present invention, the inner end side of the lower link mounting pin 9 to which the lower link 12 is connected in an insertion manner is supported by the insertion hole 11 formed in the transmission case 1, and the outer end side of the mounting pin 9 is supported by the insertion hole 11 formed in the transmission case 1. It has a double-sided structure supported by the case 3 of the transmission system via the overhanging flange portion 10, and the support strength of the lower link attachment pin 9 is improved.

(Embodiment) Hereinafter, embodiments of the present invention will be described based on the drawings. In Figs. is built-in.

Reference numeral 3 denotes a transmission system case, which consists of a brake case 4 and a rear axle case 5 made of cast iron.The brake case 4 and the rear axle case 5 are provided with a plurality of circumferential stand bolts 6 and Each is attached using a Nando 7. 8 is the rear axle.

Reference numeral 9 designates a lower link mounting bin, and a mounting plate 10 made of a substantially triangular plate-shaped SS material or the like is welded to the outer end thereof, and the mounting plate 10 constitutes an overhanging flange portion. The inner end of the mounting bin 9 is fitted and supported in the fitting hole 11 formed on both sides of the rear end of the transmission case 1, and the mounting plate 10 on the outer end side
are fastened together using a pair of stud bolts 6 and nuts 7 that attach the brake case 4 and rear axle case 5.

Here, the mounting plate 10 is fixedly attached to the case 3 side.

At this time, the stand bolts 6 for mounting and fixing the mounting plate 10 are longer than the other stand bolts 6, as shown in FIG. Further, the ball joint portion of the lower link 12 is inserted into the intermediate portion of the mounting bin 9, and intermediate adjustment collars 13 of different widths are fitted onto both sides of the lower link 12, respectively.

By exchanging the left and right positions of this width adjustment collar 13, it is possible to change the lower links 12 on both sides during installation.
By preparing medium adjustment collars 13 of various widths in advance,
Categories such as category 1, category 2, category 3, etc. can be changed.

The embodiment of the present invention is configured as described above, and has a double-supported structure in which the inner part and the outer end of the mounting bin 9 are supported.
The support strength of the mounting bin 9 is improved, and bending of the mounting bin 9 can be effectively prevented.1. ] It does not require high-strength materials or large diameter construction, and can be provided at low cost with a simple construction. Furthermore, the mounting plate 10 made of SS material or the like can be used and has excellent durability.

Figures 6 to 8) J traction equipment; shows a connection structure in which the J traction equipment 20 is attached using the lower link attachment bin 21, and the traction equipment 7120 includes the cross member 22, the swing draw bar 23, and the side plate 24. etc. will be provided. Attachment portions 26 are provided on both sides of the front end of the cross member 22 and are provided with insertion holes 25 through which the attachment pins 21 are inserted.

Further, a support wall 27 is integrally provided on the brake case 4 attached to the transmission case 1, and the support wall 27
The mounting portion 26 of the cross member 22 is fitted into the mounting pin 21 which is supported on both sides by the fitting hole 28 and the fitting hole 28, and the lower link 12 is fitted therein. A pair of left and right side plates 24 are mounted between the cross member 22 and the mixer case 1. 3o is a fixing bolt for fixing the mounting plate 29 of the mounting bin 21. With the above configuration, the lower link mounting pin 21 can also be used to attach the cross member 22, and the cross member 22 can be configured more compactly than a structure in which the cross member 22 is bolted to the lower surface of the mission case 1, and can be fixed. No additional bolts are required. Further, as shown in FIG. 9, if the present invention is used to connect the cross member 22 and the lower link 12, there is an advantage that the durability is excellent.

(Effects of the Invention) According to the present invention, in the lower link connection structure in which the lower link is connected in a manner such that the lower link is inserted through the lower link mounting pins provided on both sides of the rear end of the transmission case in a manner that projects outwardly, each The inner ends of the lower link mounting pins are fitted into the insertion holes formed in the transmission case, and the projecting flange portions provided on the outer ends of each lower link mounting pin are
The mounting is fixed to the transmission case mounted on both outsides of the transmission case, and has a double-supported structure in which both ends of the mounting pin are supported, which effectively prevents the mounting pin from bending. It has a simple configuration and can be provided at low cost. Furthermore, the mounting pin is provided with an overhanging flange portion, and the overhanging flange portion is attached and fixed to the case of the transmission system, thereby improving durability.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional rear view of the main part showing an embodiment of the present invention, Fig. 2 is a side view of the same, Fig. 3 is an exploded view of the same, and Figs. 4 and 5 are cross-sectional rear views of main parts showing a conventional example. , Fig. 6 is a side view of the main parts showing the connection structure of the traction device, Fig. 7 is a rear view of the main parts, Fig. 8 is an exploded perspective view of the same, and Fig. 9 shows how the traction device is installed using the present invention. FIG. 1...Mission case, 3...Case, 9...
Lower link mounting pin, 10... Mounting plate, 11... Fitting hole, 12... Lower link.

Claims (1)

[Claims] (1) In a lower link connection structure in which a lower link (12) is inserted and connected to lower link mounting pins (9) provided outwardly protruding on both sides of the rear end of a mission case (1), The inner end of each lower link mounting pin (9) is fitted into and supported by the insertion hole (11) formed in the transmission case (1), and the tensioner provided at the outer end of each lower link mounting pin (9) is supported. A lower link connection structure characterized in that a protruding flange portion (10) is attached and fixed to a transmission system case (3) mounted on both outer sides of a transmission case (1).