CN201363169Y

CN201363169Y - Nested camshaft

Info

Publication number: CN201363169Y
Application number: CNU2008201714475U
Authority: CN
Inventors: 徐志江; 朱国富; 沈建英; 徐洪海; 金国成
Original assignee: SHANGYU INTERNAL-COMBUSTION ACCESSORIES Co Ltd
Current assignee: SHANGYU INTERNAL-COMBUSTION ACCESSORIES Co Ltd
Priority date: 2008-12-30
Filing date: 2008-12-30
Publication date: 2009-12-16
Anticipated expiration: 2018-12-30

Abstract

The utility model relates to a nested camshaft, which is mainly characterized in that the camshaft comprises a mandrel, a timing gear bush, an end bearing bush, cams, a bearing bush, locating sleeves, key pins, a tail bearing bush and the like which are assembled together in a nesting way. The timing gear bush, the tail bearing bush and the mandrel are fixed together, and the rest of the nested parts are located by the locating sleeves with different lengths, and are connected with the mandrel through key slots and key pins. The phase angles of the inlet cam and the exhaust cam are changed by the change of the positions of the key slots of the inner holes of the cams. The nested parts can be separately machined, consequently, the nested parts can be flexibly produced according to the various properties of the camshaft, the product performance and the production efficiency can be notably increased, and the production cost can be notably reduced.

Description

The nesting type camshaft

Technical field

The utility model belongs to the mechanical technique territory, particularly a kind of nesting type camshaft.

Background technique

Camshaft is an important spare part in the engine air distribution system, be responsible for driving valve opening and closing on time, can regularly suck fresh air when cooperating engine operation, and in time waste gas after burning be discharged, require camshaft should have certain toughness that very high wear resistance is arranged again.

At present, most of camshaft is taked solid forging or casting, and material is medium carbon low alloy steel or spheroidal graphite cast iron etc.Processing technology comprises roughing, semi finishing and fine finishing.Operation is various, requires machining allowance big, and cost of production is big, and manufacturing efficiency is low.Especially because used material is single, the processing back is difficult to satisfy simultaneously the requirement to the camshaft each side.

Many shortcomings at one-piece camshaft production existence, develop various assembled cam shafts in the industry, key technology all is the connecting means at cam or other functor and axle, as rolling expansion method, annular knurl connection method etc. in hot jacket method, internal high pressure forming method, the pipe.All these methods respectively have deficiency, or the implementation methods complex structure, or each component-assembled reaches precision prescribed certain difficulty is arranged.

Summary of the invention

The purpose of this utility model puts forward at the present situation of present assembled cam shaft, and major character is a nesting type structure, and is specific as follows:

1, the camshaft nested unit comprises mandrel, timing gear axle sleeve, step bearing cover, cam, supporting sleeve, setting sleeve, pin key, tailing axle bearing sleeve etc.

2, there is screw at the mandrel two ends, are used for fastening timing gear axle sleeve and tailing axle bearing sleeve, and length direction has keyway.

3, endoporus such as timing gear axle sleeve, step bearing cover, cam, supporting sleeve, setting sleeve, pin key, tailing axle bearing sleeve have keyway.

4, the length root a tree name of setting sleeve will be asked for different length.

Embodiment of the present utility model is:

The embedded pin key of mandrel keyway, nested successively timing gear axle sleeve (fastening), step bearing cover, setting sleeve, intake cam, setting sleeve, exhaust cam, supporting sleeve with fastening screw trip bolt ... last nested tailing axle bearing sleeve is also fastening with fastening screw trip bolt, finishes whole nested camshaft assembling.The phase angle variations of intake cam and exhaust cam realizes by the change of cam inner hole key slot position.

Obviously, the related nested unit of the utility model can be processed respectively, so just can be according to the various performance flexible production of camshaft, and product performance, cost of production, manufacturing efficiency can be significantly improved.

Description of drawings

Fig. 1 is the utility model generalized section

Fig. 2 is that the utility model setting sleeve links cross sectional representation

Fig. 3 is that the utility model axle journal links cross sectional representation

Fig. 4 is that the utility model cam links cross sectional representation

Fig. 5 is the utility model intake and exhaust cam shaft section schematic representation

Among the figure: 1-timing gear axle sleeve, 2-step bearing cover, 3-intake cam, 4-setting sleeve, 5-exhaust cam, 6-supporting sleeve, 7-key pin, 8-mandrel, 9-tailing axle bearing sleeve

Embodiment

In conjunction with the accompanying drawings 1, Fig. 2, Fig. 3, Fig. 4 the utility model specific embodiment are described as follows:

The related nested camshaft of the utility model comprises mandrel 8, timing gear axle sleeve 1, step bearing cover 2,

cam

3,5 ... supporting sleeve 6, setting sleeve 4, pin key 7, tailing axle bearing sleeve 9 etc.Described mandrel 8 two ends have fastener hole respectively, and at length direction keyway are arranged, embedded pin key 7.

During assembling, at first nested timing gear axle sleeve 1, and fastening with fastening screw trip bolt, nested successively then step bearing cover 2, setting sleeve 4, intake cam 3, setting sleeve, exhaust cam 5, setting sleeve, a bearing housing 6 ..., last nested tailing axle bearing sleeve 9, and fastening with fastening screw trip bolt.

Described timing gear axle sleeve, tailing axle bearing sleeve and mandrel can be fastening without key pin and fastening screw trip bolt, and it is fastening directly to use modes such as left-hand thread instead, and promptly described mandrel end cylindrical, timing gear axle sleeve and tail hold axle sleeve endoporus car left-hand thread.

Described setting sleeve length is selected for use according to each function shelves of camshaft (cam, bearing guard etc.) spacing.It is the C type that while setting sleeve cross section can change the O type, promptly adopts open loop structure, and institute's gap width is key pin 7 width.

The phase angle variations of intake cam and exhaust cam realizes (Fig. 5) by the change of cam inner hole key slot position.

The related nested unit of the utility model can be processed respectively, so just can be according to the various performance flexible production of camshaft, and product performance, cost of production, manufacturing efficiency can be significantly improved.

Claims

1, a kind of nesting type camshaft, by comprising that mandrel, timing gear axle sleeve, step bearing cover, cam, supporting sleeve, setting sleeve, pin key, tailing axle bearing sleeve etc. constitute, major character is a nesting type structure, there is screw at described mandrel two ends, length direction has keyway, endoporus such as described timing gear axle sleeve, step bearing cover, cam, supporting sleeve, setting sleeve, pin key, tailing axle bearing sleeve have keyway, are nested on the mandrel that embeds pin key.

2, must ask 1 described nesting type camshaft according to power, it is characterized in that mandrel and timing gear axle sleeve are fastening with screw by the screw of mandrel end.

3,, it is characterized in that mandrel and tailing axle bearing sleeve are fastening with screw by the screw of mandrel end according to the described nesting type camshaft of claim 1.