CN104214206B

CN104214206B - A kind of engine cam thrust brake

Info

Publication number: CN104214206B
Application number: CN201410428866.2A
Authority: CN
Inventors: 刘丕人; 王黎明; 季永会; 吴亚龙
Original assignee: Henan Diesel Engine Industry Co Ltd
Current assignee: Henan Diesel Engine Industry Co Ltd
Priority date: 2014-08-28
Filing date: 2014-08-28
Publication date: 2016-05-25
Anticipated expiration: 2034-08-28
Also published as: CN104214206A

Abstract

The invention belongs to field of mechanical technique, propose a kind of engine cam thrust brake. A kind of engine cam thrust brake proposing includes supporter and thrust assembly; Supporter includes gear housing (4), bear box (2) and bearing insert (3); The bear box (2) connecting firmly with gear housing (4) is the flange-like structure with ladder endoporus; The outer diametric plane of bearing insert (3) of tubular structure and the small diameter bore interference fit of bear box ladder endoporus, aperture surface and camshaft (1) matched in clearance; Thrust assembly includes thrust cover plate (6), locating ring (7) and the thrust ring (8) of multidiameter shape structure; And there is the gap in order to camshaft axial float between the left side of the locating ring (7) that camshaft (1) connects firmly and the small diameter shaft right side of thrust cover plate (6). The present invention has avoided camshaft edge bush eccentric wear problem, and provides lubricated to thrust brake, has feature simple in structure, convenient disassembly.

Description

A kind of engine cam thrust brake

Technical field

The invention belongs to field of mechanical technique, relate to a kind of engine cam thrust brake.

Background technology

Camshaft is the important moving component of engine, and it drives rocking arm valve mechanism, for engine provides essential fresh air. On the engine of many enhanced types, camshaft is arranged in the body hole of engine, and active oblique gear drives the driven helical gear that is arranged on camshaft termination, and camshaft is run up. Camshaft is in operation process, be subject to the axial thrust from active oblique gear, under axial thrust effect, camshaft is vibration vertically, departs from home position, and this increases camshaft driven gear mechanical load, when serious, can cause gear to depart from transmission system, cause engine to damage, therefore must on engine, arrange camshaft thrust brake, the axial float of restriction camshaft.

At present, the camshaft thrust scheme that many engines are taked is: in the driven helical gear periphery on camshaft termination, annular groove is set, on body end face, thrust plate is installed, thrust plate snaps in annular groove, realize the thrust of camshaft with this, as (CN102330728A) described structure of patent " a kind of thrust structure of engine cam ". Thrust brake in this structure is arranged in the gear housing of body termination, and camshaft stretches out longer, and camshaft termination, without supplemental support, causes gear at camshaft upper cantilever, has affected the reliability of camshaft; On the other hand, thrust plate is easy to wear, needs to check, change after running some cycles, and this thrust structure is arranged in gear-box, when dismounting, must first pulls down gear housing and be arranged on the part on gear housing, dismounting inconvenience, working strength is very large, and wastes time and energy.

Summary of the invention

For solving the problems of the technologies described above, the present invention proposes a kind of engine cam thrust brake.

The present invention adopts following technical proposals to complete its invention task:

A kind of engine cam thrust brake, described camshaft thrust brake includes supporter and thrust assembly; Described supporter includes gear housing, bear box and bearing insert; Described gear housing and diesel engine using bolt connect firmly, and thrust brake is played a supportive role; Described bear box is the flange-like structure with ladder endoporus; Described bear box and described gear housing adopt bolt to connect firmly; Described camshaft stretches in the ladder endoporus of bear box, the described bearing insert of tubular structure is nested with on described camshaft and between the small diameter bore and described camshaft of described bear box ladder endoporus, the small diameter bore interference fit of the outer diametric plane of described bearing insert and bear box ladder endoporus, the aperture surface of bearing insert and camshaft matched in clearance; Described thrust assembly includes thrust cover plate, locating ring and thrust ring; Described thrust cover plate is multidiameter shape structure, described thrust cover plate and described bear box adopt bolt to connect firmly, and the small diameter shaft right-hand member of thrust cover plate is positioned at the large diameter hole of bear box shoulder hole, matched in clearance between the large diameter hole inwall of shoulder hole in the outer diametric plane of the small diameter shaft of described thrust cover plate and bear box; Described locating ring be nested with on the locating shoulder at camshaft left side middle part and with the locating shoulder matched in clearance of camshaft, described locating ring and camshaft adopt bolt to connect firmly, between the small diameter shaft right side of the left side of described locating ring and thrust cover plate, there is the gap in order to camshaft axial float, in the outer diametric plane of described locating ring and bear box, between the large diameter hole inwall of shoulder hole, there is gap; Described thrust ring is between described bearing insert and described locating ring and be fixed on the cascaded surface of shoulder hole in bear box, between the left side of described thrust ring and the right side of described locating ring, has gap; Between the right side of described thrust ring and described bearing insert, there is gap; The outer diametric plane matched in clearance of the aperture surface of described thrust ring and camshaft.

Having with thinking that camshaft thrust brake provides axial oil duct and the radial direction oil of lubricating oil of described camshaft; Described axial oil duct is the axially extending bore that is positioned at camshaft center; Described radial direction oil is perpendicular to described axial oil duct setting, and the gap between the corresponding bearing insert of described radial direction oil and camshaft arranges; On described bear box, there is the inclined oil hole of air that is communicated with the interior shoulder hole of bear box and gear-box.

The present invention proposes a kind of engine cam thrust brake, camshaft thrust brake is installed on the gear housing of engine, camshaft has been played to supporting role, avoided camshaft edge bush eccentric wear problem, reliability is higher compared with other camshaft thrust brake; Because thrust ring is easy to wear, need periodic replacement, can become some shelves by thickness different designs, when replacing, only need pull down thrust cover plate and locating ring, just can take out thrust ring, the gear-box of need not dismantling, dismantles very convenient; It is lubricated that this device utilizes on camshaft original oil duct to carry out pressure oil to thrust cover plate, locating ring and thrust ring, effectively reduces the wearing and tearing of thrust parts.

Brief description of the drawings

Fig. 1 is structural representation of the present invention;

In figure: 1, camshaft; 2, bear box; 3, bearing insert; 4, gear housing; 5, bolt I; 6, thrust cover plate; 7, locating ring; 8, bolt II; 9, thrust ring; 10, bolt III; 11, inclined oil hole of air; 12, straight pin; 13, axial oil duct; 14, radial direction oil.

Detailed description of the invention

Below in conjunction with accompanying drawing and concrete enforcement, the present invention is illustrated:

As shown in Figure 1, a kind of engine cam thrust brake, described camshaft thrust brake includes supporter and thrust assembly, described supporter includes gear housing 4, bear box 2 and bearing insert 3, described gear housing 4 connects firmly with diesel engine using bolt, and thrust brake is played a supportive role, described bear box 2 is for having the flange-like structure of ladder endoporus, described bear box 2 adopts bolt I to connect firmly with described gear housing 4, described camshaft 1 stretches in the ladder endoporus of bear box, the described bearing insert 3 of tubular structure is nested with on described camshaft and between the small diameter bore and described camshaft 1 of described bear box ladder endoporus, the small diameter bore interference fit of the outer diametric plane of described bearing insert 3 and bear box ladder endoporus, the aperture surface of bearing insert 3 and camshaft 1 matched in clearance, described thrust assembly includes thrust cover plate 6, locating ring 7 and thrust ring 9, described thrust cover plate 6 is multidiameter shape structure, described thrust cover plate 6 adopts bolt III to connect firmly with described bear box 2, and the small diameter shaft right-hand member of thrust cover plate 6 is positioned at the large diameter hole of bear box shoulder hole, described locating ring 7 be nested with on the locating shoulder at camshaft left side middle part and with the locating shoulder matched in clearance of camshaft, described locating ring 7 adopts bolt II to connect firmly with camshaft 1, between the small diameter shaft right side of the left side of described locating ring 7 and thrust cover plate, there is the gap in order to camshaft axial float, in the outer diametric plane of described locating ring 7 and bear box, between the large diameter hole inwall of shoulder hole, there is larger gap, described thrust ring 9 is between described bearing insert 3 and described locating ring 7 and be fixed on the cascaded surface of shoulder hole in bear box, between the left side of described thrust ring 9 and the right side of described locating ring 7, has gap, between the right side of described thrust ring 9 and described bearing insert 3, there is gap, the outer diametric plane matched in clearance of the aperture surface of described thrust ring 9 and camshaft 1.

Described camshaft has with thinking that camshaft thrust brake provides axial oil duct 13 and the radial direction oil 14 of lubricating oil; Described axial oil duct 13 is for being positioned at the axially extending bore at camshaft center; Described radial direction oil 14 arranges perpendicular to described axial oil duct 13, and the gap between the corresponding bearing insert 3 of described radial direction oil 14 and camshaft 1 arranges; On described bear box, there is the inclined oil hole of air 11 that is communicated with shoulder hole, gear-box in bear box.

Camshaft thrust brake thrust principle: the installation dimension by appropriate design thrust cover plate 6, locating ring 7 and thrust ring 9 with bear box 2 and camshaft 1, make to retain suitable gap between thrust cover plate 6 right sides and locating ring 7 left sides, camshaft 1 axial motion in interstice coverage, for ensureing to obtain good lubricating between each thrust parts mating surface, conventionally the length C in gap is controlled within the scope of 0.1～0.25mm. When engine operation, camshaft 1 is side-to-side movement vertically under axial thrust effect, when camshaft 1 is during to left movement, drives locating ring 7 together left, and the thrust cover plate 6 being now fixed on bear box 2 has limited camshaft 1 freely-movable left; In the time that camshaft 1 moves right, drive locating ring 7 together to the right, the thrust ring 9 being now fixed on bear box 2 has limited camshaft 1 freely-movable to the right, has realized thus the thrust of camshaft 1.

Camshaft thrust brake is lubricated: enter the pressure lubrication oil in longitudinal oil duct 13 at camshaft center, the one road radial direction oil 14 of flowing through, entering the outer diametric plane mating surface of bearing insert 3 aperture surfaces and camshaft 1 is lubricated, the gap of then flowing through between thrust ring 9 aperture surfaces and the outer diametric plane of camshaft 1 along mating surface, enter thrust ring 9 left sides, the mating surface of lubricated locating ring 7 and thrust ring 9; Another road binders enters the cavity in thrust cover plate 6 through the centre bore of longitudinal oil duct 13, locating ring 7, then flows into thrust cover plate 6 and realizes and lubricating with the mating surface of locating ring 7, and last, the inclined oil hole of air 11 that two road binders warp beams are held housing 2 flows into gear housing 4 inside.

Claims

1. an engine cam thrust brake, is characterized in that: described camshaft thrust brake includes supporter and thrust assembly; Described supporter includes gear housing (4), bear box (2) and bearing insert (3); Described gear housing (4) connects firmly with diesel engine using bolt, and thrust brake is played a supportive role; Described bear box (2) is for having the flange-like structure of ladder endoporus; Described bear box (2) adopts bolt I to connect firmly with described gear housing (4); Described camshaft (1) stretches in bear box ladder endoporus, the described bearing insert (3) of tubular structure is nested with at described camshaft (1) and goes up and be positioned between the small diameter bore and described camshaft (1) of described bear box ladder endoporus, the small diameter bore interference fit of the outer diametric plane of described bearing insert (3) and bear box ladder endoporus, the aperture surface of bearing insert (3) and camshaft (1) matched in clearance; Described thrust assembly includes thrust cover plate (6), locating ring (7) and thrust ring (9); Described thrust cover plate (6) is multidiameter shape structure, described thrust cover plate (6) adopts bolt III to connect firmly with described bear box (2), and the small diameter shaft right-hand member of thrust cover plate (6) is positioned at the large diameter hole of bear box ladder endoporus, matched in clearance between the outer diametric plane of the small diameter shaft of described thrust cover plate (6) and the large diameter hole inwall of bear box ladder endoporus; Described locating ring (7) be nested with on the locating shoulder at camshaft left side middle part and with the locating shoulder matched in clearance of camshaft, described locating ring (7) adopts bolt II to connect firmly with camshaft (1), between the small diameter shaft right side of the left side of described locating ring (7) and thrust cover plate (6), there is the gap in order to camshaft axial float, between the outer diametric plane of described locating ring (7) and the large diameter hole inwall of bear box ladder endoporus, there is gap; Described thrust ring (9) is positioned between described bearing insert (3) and described locating ring (7) and is fixed on the cascaded surface of bear box ladder endoporus, between the left side of described thrust ring (9) and the right side of described locating ring (7), has gap; Between the right side of described thrust ring (9) and described bearing insert (3), there is gap; The outer diametric plane matched in clearance of the aperture surface of described thrust ring (9) and camshaft (1).

2. a kind of engine cam thrust brake according to claim 1, is characterized in that: described camshaft has with thinking that camshaft thrust brake provides axial oil duct (13) and the radial direction oil (14) of lubricating oil; Described axial oil duct (13) is for being positioned at the axially extending bore at camshaft center; Described radial direction oil (14) arranges perpendicular to described axial oil duct (13), and the gap between the described corresponding bearing insert of radial direction oil (14) (3) and camshaft (1) arranges; On described bear box (2), there is the inclined oil hole of air (11) that is communicated with bear box ladder endoporus, gear housing.