US2175433A - Hydraulic brake - Google Patents

Description

0a. 10, 1939. H. D. GEYQER 2,175,433

HYDRAULIC BRAKE Filed Jan. 16, 1939 I Bmaentot g 27% q (Ittomegs Patented 10, 1939 HYDRAULIC BRAKE Harvey D. Geyer, Dayton, Ohio, asaignor to Gen- Mctol's Corporation, Detroit, Micln, a corporation of Delaware Application January 16, 1939, Serial No. 251,103

:Olaims.

This invention relates to brakes and has been designed particularly as an improvement in the mounting of the wheel cylinders of hydraulic brake systems as used on vehicles.

An object of the invention is to prevent the chattering or rattling which sometimes occurs when the brakes are applied.

.Other objects, such as the accomplishment of the above major object in a way which shall be efl'ective and comparatively inexpensive, will be understood from the following description.

The invention is illustrated by the accompanying drawing in which:

Figure l is a view in elevation andl5 Figure 21s a section on line {-2 of Figure 1.

Referring to the drawings brake drum ,is shown at i. This is the drum which rotates with the wheel of the vehicle. At 1 is a cover plate. It does not rotate with the wheel but is fixedly carried by the rear axle housing or the front axle steering knuckle as the case may be. Within the drum are shoes 8 and II. The shoes are adaptedto frictionally engage the drum and may be anchored in any convenient way to the cover 1. To spread the shoes into. contact with the drum there is a. so-called wheel cylinder II of the conventional hydraulic brake system. As

is usual, this cylinder is secured to the cover plate between one pair of adjacent ends of the shoes. It is equipped adjacent each end with a piston l5 and a packing ll. The outward movement of the pistons is transmitted by pins 19 havin notches 2i engaging the webs II of the shoes. Adjusting cup shaped nuts 25 embrace the ends of the cylinder, are threaded on the pins [8, and are adapted to abut the ends of the cylinders under the influence of a retracting spring 21. The packings ii are separated and held against the pistons by a spring 20.

o Fluid is forced by a master cylinder, not shown,

through the usual conduit and aninlet II to the space between the pistons. To hold the nuts 28 in adjusted position, a spring clip 33 is securedto the cylinder at 35 and engages at its ends notched portions 31 on the nuts 25.

The notched ends of the pins are somewhat 6 flared and chattering noises have been found to occur between the web of the shoe and the notch. of the pin resulting from a relative sidewise movement of the web in the notch. In the present installation, the axis of cylinder It and 10 its pins is shown by line 11-12. This axis is arranged at a small angle, a few degrees, to the line 0-0 representing the plane of'the shoe webs. /In this way the webs of the shoe not only engage the bottom wall of the notches of the pins '15 but also engage side wallsas shown and the chattering caused by a movement of the shoe web within the notch is avoided. The pressure of the pins has a small component holding the webs against side walls of the slots as will be seen by 20 reference to Figure 2.

I claim:

1. Brake mechanism including a rotatable drum, shoes to engage the drum, said shoes having webs. a cylinder between spaced ends of said shoes. 25

pistons reciprocable within said cylinder, pins interposed between said pistons and said shoe webs, said pins having slots to engage said webs, the axis of said cylinder and pins being angularly related to the plane of said shoe webs.

2. Brake mechanism including a rotatable drum, shoes to engage the drum, said shoes having webs. a cylinder between spaced ends of said shoes pistons reciprocable within said cylinder,

pins interposed between said pistons and .said shoe webs, said pins having slots to engage said webs, the vertical plane containing the axis of said cylinder being angularly related to the vertical plane of the shoe webs.

HARVEY D. em.

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