JPS627897Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sealing device for a transmission case or the like.

In other words, in a transmission case, etc., in which a part of the mating surface that joins both split case bodies is formed with a corresponding semicircular recess into which the shaft is inserted, assembly is performed in which the shaft is inserted into the recess. In this case, the sealing between the two split case bodies can be ensured throughout the entire area, and the sealing effect is particularly effective in the recessed part, so that the sealing effect can be ensured in the split transmission case, etc. .

The embodiments shown in the drawings will be described below.

Reference numerals 1 and 1' indicate split case bodies, which are formed so that a transmission case can be assembled by joining corresponding mating surfaces 2 and 2' formed around the respective parts,
Bolt holes 6 for assembly are formed at predetermined intervals on both mating surfaces 2, 2', and corresponding circumferential groove-shaped semicircular recesses 4, 4' are formed in a part of both mating surfaces 2, 2'. 2 of each are formed side by side, and a mating surface 2,
A protrusion 5, 5' is formed to protrude from the end on the 2' side in the circular direction, and the inner part approaching the inner recess 4, 4' is a semicircle into which the bearing 7 can be fitted. Arc-shaped recesses 8 are formed respectively, and the shaft 3 to be fitted into the bearing 7 is inserted through the center of both recesses 4 and 4' to extend into and out of the transmission case so that transmission can be carried out.

Numerals a and a are annular packings made of rubber, which are formed so as to fit into the inner peripheral surfaces of the recesses 4, 4, 4', and 4', and are formed so that they can be fitted into the inner peripheral surfaces of the recesses 4, 4, 4', and 4'. From the corresponding circumferential surface portion, narrow band-like packings A are connected and extended as one body, forming a three-dimensional packing as a whole, and the narrow band-like packing A is formed to extend endlessly between the mating surfaces 2 and 2'. Bolt holes 6' are formed at predetermined intervals. Further, a circumferential groove 9 is formed on the inner circumferential surface of both annular packings a, a, and a core metal 1 is formed inside.
C-shaped oil seals 11, 11 having a diameter of 0 are fitted into circumferential grooves 9, 9, respectively.

Therefore, when assembling the transmission case, as shown in FIG. As shown in FIG. Both the recesses 4, 4' are fitted into the upper halves of the annular packings a, a, and the mating surfaces 2' are aligned above the strip-shaped packing A, and each bolt hole 6,
When a bolt is inserted into 6' and tightened, the three-dimensional packings of the annular packings a, a and the strip-shaped packing A can seal between the two divided case bodies 1, 1'.

When tightening, a part of the outer circumferential surface of the annular gaskets a, a is strongly pressed against the protrusions 5, 5' on the bottom wall of the recess, and due to elastic deformation due to this press, both lateral sides of the fitting part of the recess are also pressed into the recess, respectively. The sealing effect in the recesses 4 and 4' is further improved due to the pressure contact with the side wall, and the inner C-shaped oil seal 11 is pressed into the annular packing a by the pressing force of the core bar 10. This can further improve the sealing effect.

In this way, the present invention has two divided case bodies 1 and 1'.
In a transmission case, etc., in which semi-circular recesses 4, 4', through which the shaft 3 is inserted, are respectively formed in a part of the mating surfaces 2, 2' where the shafts 3 are inserted.
A narrow band-like packing A is provided so as to be clamped between both mating surfaces 2, 2', and extends continuously from the outer circumferential surface corresponding portions of the annular packing A fitted across both the recesses 4, 4'. The annular packing a has an inner circumference formed into a circumferential groove 9 that fits tightly into the oil seal 11, and an outer wall surface on three sides of the outer circumference formed into the recesses 4, 4'.
Formed so that the joint surface corresponds to the three-sided walls of
Furthermore, protrusions 5, 5' are formed protruding from the center of the bottom wall circumferential surface of both the recesses 4, 4' on the split case side, which are in contact with the outer circumferential surface of the annular packing a. The three outer wall surfaces of the annular packing A form the recesses 4, 4' due to elastic deformation due to the pressure contact between the surfaces.
Since the three-dimensional packing of the annular packing A and the narrow band-shaped packing A is made to come into close contact with the three-sided walls of the recessed portions 4 and 4' through which the shaft 3 is inserted, and the mating surfaces 2 and 2', a good seal is ensured by the three-dimensional packing. In addition, especially in the concave portions 4 and 4', which are prone to leakage, the annular packing fits into the three-sided walls of the concave portions 4 and 4', and the outer circumferential surface of the annular packing a is flush with the bottom of the concave portion. Since they are pressed against the raised parts of the walls, when the split cases are joined together, the raised parts 5 and 5' are strongly brought into close contact with the outer periphery of the annular packing, and due to the elastic deformation of the annular packing due to this pressure contact, both lateral sides of the ring-shaped packing are also pressed against the lateral walls of the recessed part. The sealing effect can be ensured by being strongly pressed against the casing, and the sealing effect can be ensured in split transmission cases and the like.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a top view of one split case body with a buttkin aligned with it, Fig. 2 is a sectional view of the transmission case taken along the - line in Fig. 1, and Fig. 3 is a cross-sectional view of the transmission case taken along the - line in Fig. The figure is a front view of the main parts, Figure 4 is an enlarged view of a part of Figure 2, Figure 5 is a top view of one split case body, Figure 6 is a top view of the packing, and Figure 7 is a partial view. FIG. 3 is an exploded view showing a broken view, and FIG. 8 is an exploded view of FIG. 2. 1, 1'...Divided case body, 2, 2'...Matching surface, 3...Shaft, 4, 4'...Concave portion, a...Annular packing, A...Striped packing, 5, 5'... ...ridge.

Claims (1)

[Scope of utility model registration request] A mating surface 2 for joining both split cases 1 and 1';
In a transmission case, etc., in which semi-circular recesses 4, 4', through which the shaft 3 is inserted, are respectively formed in a part of 2', an annular recess 4, 4' is fitted and joined across both recesses 4, 4'. Narrow band-like packings A are provided so as to be sandwiched between both mating surfaces 2 and 2', each extending in a continuous manner with the outer circumferential surface corresponding portion of the packing A,
The annular packing a is formed so that its inner circumferential portion becomes a circumferential groove 11 that fits tightly into the oil seal 11, and the three outer wall surfaces of the outer circumferential portion serve as joint surfaces corresponding to the three-sided walls of the recesses 4 and 4'. Furthermore, both recesses 4 on the split case side are in contact with the outer peripheral surface of the annular packing a.
Protrusions 5, 5' are formed protrudingly at the center of the bottom wall circumferential surface of 4', and the three-sided outer wall surface of the annular packing a is elastically deformed when the outer circumferential surface is pressed against the protrusions 5, 5'. A sealing device for a transmission case, etc., characterized in that it is in close contact with the three walls of the recesses 4, 4'.