JPS5824018Y2 - Bearing retainer - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a bearing retaining device.

For example, as shown in FIG. 1, in a horizontal engine equipped with a two-shaft balancer, a pair of bearings 2A and 2B that support both balancer shafts IA and IB are connected to one bolt 4.
At the same time, it was fixed to prevent it from coming off by the retainer 3 which is fixed at the same time.

In this case, in order to prevent the stopper 3 from rotating, a stopper protrusion 5 is protruded between the bearing support bosses, and the circumferential wall of the stopper 3 is held against the stopper protrusion 5.

However, in this case, the locking protrusion 5 was cast integrally with the front wall of the crankcase and was used as a raw material, so there was a large error in the distance between the locking surface 5a and the center of the bolt 4. When I tightened bolt 4, the plate stopper came loose.
It was not possible to securely stop the removal, or the distance was too short to attach the removal stopper 3.

This idea involves forming a notch on the periphery of the retainer, making the pair of abutting surfaces of the notch face each other at an appropriate distance in the circumferential direction with the bolt as the center point, and attaching the inner abutting surface to the locking protrusion. The feature is that by externally engaging, the displacement of the retainer due to formation errors and positional errors of the rotation prevention protrusion is eliminated, and the retainer can be securely retained.

Examples of this invention will be described below based on the drawings.

FIG. 2 is a longitudinal sectional front view of essential parts of a horizontal diesel engine equipped with a two-shaft balancer, and FIG. 3 is a sectional view taken along the line 11-1 in FIG.

In the figure, 11 is a crankcase, 12 is a crankshaft,
13 is a gear case.

A two-shaft balancer 14 configured with a pair of upper and lower balancer shafts 14A and 14B is disposed outside the bottom dead center of the crankshaft 12.

Balancer gears 15A and 15B are mounted near the front ends of both balancer shafts l4A and 14B, respectively, and both shafts 14A and 14B are interlocked by their meshing.

An input gear 16 is attached to the outer surface of the lower balancer gear 15B, and this is interlocked with the crank gear 18 via the idle gear 17, so that the crankshaft 12 and the balancer 14 rotate synchronously.

The balancer shafts 14A and 14B are supported by bearings 19 on both the front and rear walls of the crankcase 11, respectively.

This bearing 19 is fixed by a retainer 20 to prevent it from coming off.

As shown in FIG. 2, the retainer 20 is formed into a trapezoidal shape as a whole, and has a hole 20a through which the bolt 21 is inserted in the center near the top, and a U-shaped notch 2 in the center of the bottom.
2 is formed.

This removal stopper 20 is attached to the front wall of the crankcase 11 with the bolt 2.
1, the retaining parts 2 at both ends of the bottom
0b presses the outer ring end face of the bearing 19.

The above-mentioned notch 22 has its two opposing end surfaces serving as contact surfaces 22a, which are received by the locking protrusion 23.

The width between the two liquid contact surfaces 222 is formed to be slightly larger than the maximum width of the formation error in the vertical width of the rotation stopper projection 23.

Further, in order to reliably absorb the formation error in the left and right width of the projection 23, the notch 22 is formed sufficiently deep, and the bottom thereof and the locking projection 23 are separated from each other by a relatively large distance.

The rotation stopper projection 23 is formed by protruding the front wall of the crankcase 11 between both bearings 19.

As shown in FIG. 4A, when the locking protrusion 23 is formed to have the minimum size, when the bolt 21 is tightened, the retainer 20 is displaced only outside the gap between the protrusion 23 and the contact surface 22a.

The deviation angle α at this time is much smaller than the deviation angle β of the conventional retainer '3 shown in FIG. 4B.

Therefore, the retaining part 20a of the retainer 20 is attached to the bearing 1.
No. 9 will not move outside the outer ring end surface.

In addition to the embodiments described above, the shape of the notch 22 may be changed to a semicircular shape, a dogleg shape, etc., and the location of the notch 22 may be formed on the upper side or the side side of the extraction tool 20. I can think of something to do.

As explained above, in this invention, a notch is formed on the periphery of the retainer, and the pair of abutting surfaces of the notch are opposed to each other at an appropriate distance in the circumferential direction around the bolt, so that both liquid contacting surfaces are rotated. Since the retainer is externally fitted onto the retaining protrusion to prevent it from rotating, the contact between the circumferential wall of the retainer and the pipe is reduced directly to the retaining protrusion. The wall comes into contact with the rotation stopper projection at a slight deviation angle, and the amount of deviation can be made extremely small.

Therefore, the retainer does not move to the outer end needle of the bearing, and the bearing can be reliably prevented from coming off.

In addition, since the amount of displacement of the retainer is small, the retainer and the rotation retainer can be machined with relatively low precision, and the standard gap between the two parts can be set large, allowing machining and Assembly can be done easily and inexpensively.

[Brief explanation of drawings]

Fig. 1 is a sectional view of main parts of an engine showing a conventional example, Fig. 2 is a longitudinal sectional front view of main parts of an engine showing an embodiment of this invention, Fig. 3 is a sectional view taken along the line 1-1 in Fig. FIG. A1B is an explanatory view of the usage state of the retainer according to the embodiment of the present invention and the conventional example. 14A, 14B... Balancer shaft, 19...
... Bearing, 20 ... Removal stopper, 21 ...
...Bolt, 22...Notch, 22a...
...22 contact surface, 23... rotation stopper projection.

Claims (1)

[Scope of utility model registration request] A plurality of bearings 19 fitted to a fixed wall are fixed simultaneously by - number of retainers 20, in which the retainers 20 are fixed to the fixed wall with one bolt 21,
A notch 22 is formed on the periphery of this retainer 20, and the notch 22
A pair of abutment surfaces 22a are opposed to each other at an appropriate distance in the circumferential direction with the bolt 21 as the center point, and the inner abutment surfaces 22a are externally engaged with a locking protrusion 23 formed integrally bulging from the fixed wall. A bearing retaining device featuring the following features.