DE3229166A1 - Bottom bracket ball bearing for pedal-driven vehicles, in particular for bicycles - Google Patents

Abstract

A bottom bracket ball bearing for pedal-driven vehicles, in particular for bicycles is to be simplified in terms of construction and assembly possibilities according to the invention in that the bottom bracket shaft, the roller bearings at both ends, a plastic sheath which is divided in two if appropriate and bearing lid form a premounted, compact constructional unit which can be pressed in its entirety into the bottom bracket ball bearing housing fixed to the frame.

Description

NEUWEG production GmbH for precision technology, 7932 Kunderkingen

Crank bearings for pedal-powered vehicles, especially for bicycles

The invention relates to a pedal crank bearing of the above type. Such bearings consist of a metallic bearing housing, a crankshaft supporting the cranks / two roller bearings and two bearing caps. With the well-known builders, the roller bearings and the pedal crankshaft are successively in a more or less complex configuration inserted into the bottom bracket housing already connected to the frame and there using additional Bearing locks mounted as a whole. High assembly time and assembly inaccuracies. are the consequence. According to the invention, a production simplification and a reduction in manufacturing costs in connection with an improvement in quality be achieved that the crankshaft is arranged with the two-ended roller bearings in a plastic sleeve are and all components together with the bearing caps form a pre-assembled compact unit, which in turn can be pressed into the bottom bracket housing. Further details of the invention are detailed in the subclaims marked.

The invention is explained by way of example with the aid of the drawing. Show it :

Figure 1 in a simplified perspective view of a bicycle frame part with a bottom bracket and rear wheel .and

FIG. 2, half in section and half in view, that which is used according to the invention, Compact component with crankshaft that can be pushed into the metal bottom bracket housing and storage.

With the reference numerals 1; 1 ^f ; 1 ″ and 1 ¹ ″ denote frame parts of a bicycle, the rear wheel of which bears the reference number 2. 3 is the metallic housing connected to the frame parts by welding or the like for receiving the crankshaft 4 and its bearing 5 placed on which pedals 6 are rotatably attached.

According to the invention, the crankshaft 4 forms with the roller bearings 7, two nested bearing sleeves 8; 8 ¹ and the bearing caps 9 a preassembled, compact structural unit 10 which can be pushed into the frame-fixed metallic bottom bracket housing 3 and can be fixed there. Structure and mounting options for the structural unit 10 can be seen in detail in FIG. 2. Thereafter, sleeves 8; 8 ′, a metallic outer race 11 for the two roller bearings 7 is let into the ends facing away from one another. The InnaäLauffläche 12 for the roller bearings 7 is machined directly into the crankshaft without cutting or cutting. Ball cages 13 secure in known

Way the distance between the rolling elements of the rolling bearings 7. Bearing caps 9 made of plastic can be pressed into the sleeve ends and protect against the ingress of dirt and foreign bodies after permanent lubrication. Is. a sleeve, e.g. B. the sleeve 8, mounted on the bearing side with the shaft 4, the second sleeve 8 is completely pushed into the sleeve 8 in order to complete the bearing 7 belonging ^{to the sleeve 8 1 by inserting the individual rolling elements and fixing the ball cage.} The final bearing spacing is then determined by pulling the sleeves 8; 8 ^f produced and by a still open compensating ring 14 in the joint area of the sleeves 8; 8 'fixed. This plastic ring gets its end position either by choosing a fine cross-section (self-locking) or by welding its ends. It goes without saying that the contact surfaces of the sleeves 8; 8 'are inclined for the ring 14 according to the profile slope of the ring.

The fixing of the structural unit 10 in the metallic bottom bracket housing 3 is finally used in shell grooves of the sleeves 8; 8 'fixed "tolerance rings" 15 made of metal, the elevations 15 'of which lead to a press fit in the bottom bracket shell 3.

List of reference symbols

1 '' '= frame parts

2 = rear wheel

3 = metal. Bottom bracket shell

4 = crankshaft

5 = cranks

6 = pedals

7 = roller bearing

8.8 * = bearing sleeve or sleeve parts

9 = bearing cover = assembly 11 = outer race = Inner running surface = ball cage 14 = compensation ring = tolerance rings

15 '= elevations

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Claims (5)

NEUWEG production GmbH for precision technology, 7932 Munderkingen claims 1.) Pedal crank bearings for pedal-driven vehicles, especially for bicycles, consisting of the pedal bearing housing connected to the vehicle frame, pedal crankshaft, roller bearings and bearing caps, characterized in that the pedal crankshaft (4) with the two-ended roller bearings (7) in a plastic sleeve (8; 8 ¹ ) are arranged and all components (4; 7; 8; 8 ') together with the bearing caps (9) form a pre-assembled compact structural unit (10) which in turn can be pressed into the bottom bracket housing (3). 2.) bearing according to claim 1, characterized in that the plastic ^{sleeve (8; 8 1} ) is constructed in two parts, the sleeve parts (8; 8 ') can be plugged into one another and that an open compensating ring (14) with a preferably trapezoidal cross-section is provided to determine the exact distance between the roller bearings (7) , which in turn can be inserted into a groove formed by correspondingly beveled adjacent sleeve end faces. 3.) Bearing according to Claims 1 and 2, characterized in that the inner running surfaces (12) for the roller bearings (7) are incorporated into the pedal crankshaft (4) and the metallic outer races (11) for the bearings (7) in corresponding recesses of the Plastic sleeve parts (8; 8 ¹ ) are inserted. 4.) bearing according to claims 1 - 3, characterized in that that the bearings (7) can be pressed outwards through into the front ends of the sleeve parts (8; 8 ') Bearing cover (9) are sealed. 5.) Bearing according to claims 1-4, characterized in that each plastic ^{sleeve part (8; 8 1} ) is assigned an outer metallic tolerance ring (15) secured against axial displacement in a casing recess, the two tolerance rings (15) via their elevations ( 15 ¹ ) can be fixed in the bore of the bottom bracket housing (3) with a press fit.