JPH0435810Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotation take-out device for a travel speedometer, which has a gear housing in which a boss member having an axle insertion hole is cast and molded from a light alloy material or a synthetic resin material.

This type of rotary take-out device is a gear in which a boss member made of cast iron, iron-based sintered alloy, etc., having an axle insertion hole is cast and molded with a light alloy material such as an aluminum alloy or a synthetic resin material such as a thermoplastic resin. A rotatable gear that receives rotation of the axle is inserted into the boss member, and a pinion shaft that meshes with the gear and rotates at a predetermined reduction ratio is pivotally supported in the gear housing, and the wheel and axle support arm are connected to each other. is sandwiched between.

By the way, since the end face of the gear housing facing the axle support arm is made up of the end face of the boss member 1 and the end face of the cast part 2 of the gear housing as shown in FIG. In the case of molding, the gear housing is molded by casting a boss member made of cast iron, iron-based sintered alloy, etc. against a mold with a moderate pressing force and casting. Due to the minute gaps caused by this, the light alloy portion causes a slight overflow of hot water on the end face of the boss member. Moreover, a similar problem may occur in injection molding.

In such a gear housing, the end surface that comes into pressure contact with the axle support arm is made of a relatively soft light alloy such as aluminum alloy or synthetic resin such as thermoplastic resin, so sufficient tightening strength cannot be ensured. The tightening and fixing parts tend to loosen due to vibrations during driving. Furthermore, the boss member may collapse during casting, making it impossible to securely attach it to the wheel. Furthermore, after the molding, the end surface of the gear housing is subjected to a cutting process such as milling to expose the end surface of the boss member, but in this case, the manufacturing cost increases.

An object of the present invention is to solve the above-mentioned problems and provide a rotation take-out device for a travel speedometer that can be reliably attached to a wheel and that does not cause loosening of the fastened portion due to vibrations during driving.

The present invention will be described below based on embodiments. Second
The figure shows an embodiment of the invention. 3 is an axle, and a rolling bearing 4 is inserted into the axle 3.
The wheel hub 5 is fitted concentrically with the axle 3 through the wheel hub 5, and a boss member 6 made of cast iron, iron-based sintered alloy, or the like having an insertion hole for the axle 3 is provided on one side of the wheel hub 5.
is connected from the vehicle body to the gear housing 7 of the speedometer rotation take-out device, which is cast and molded from a light alloy material such as an aluminum alloy or a magnesium alloy, or a synthetic resin material such as a thermoplastic resin or a thermosetting resin. An axle support arm 8 is inserted into the axle 3 and fixed together by tightening a nut 9. The extraction device consists of the gear housing 7 and a gear device 10 provided within the gear housing 7. The gear housing 7 has a cylindrical portion 11, and the cylindrical portion is connected to an oil seal provided in the wheel hub 5. 12 to prevent dust, muddy water, etc. from entering the gear device 10 and the rolling bearing 4 in the gear housing 7. The gear device 10 also has a gear 10a that is connected to and rotates with the wheel hub 5 via a transmission member 13 that transmits the rotation of the wheel hub 5, and a traveling speedometer ( (not shown) and a pinion gear 10b that transmits rotation to the motor (not shown).

The end face of the gear housing 7 of the speedometer rotation take-out device facing the axle support arm 8 is formed by making the end face of the boss member 6 protrude by a slight distance l from the end face of the cast-in part 7a.

From the above, the present invention suggests that the gear housing is
Since this is a speedometer rotation take-out device that has an end face facing the axle support arm with a boss member slightly protruding from the end face of the cast part, the light alloy part or the synthetic resin part covers the end face of the boss member. There is no need to put it away, the boss member does not fall down, and it can be reliably attached to the wheel. Further, a large tightening strength can be ensured, and the tightening and fixing portion does not loosen due to vibrations during running. Furthermore, it can be easily manufactured without increasing manufacturing costs.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a gear housing of a conventional speedometer rotation take-out device, and FIG. 2 is a longitudinal sectional view of an embodiment of the present invention. Explanation of symbols, 3...Axle, 6...Boss member, 7
...Gear housing, 7a... Casting part, 8...
...Axle support arm.

Claims (1)

[Scope of utility model registration request] For a traveling speedometer, a gear housing of a rotary take-out device and an axle support arm, in which a boss member having an axle insertion hole is cast and molded from a light alloy material or a synthetic resin material, are inserted into the axle and tightened together. A rotation take-out device for a traveling speedometer, characterized in that the gear housing has an end face facing an axle support arm with a boss member slightly protruding from the end face of a cast-in part thereof.