CN204900746U

CN204900746U - Crankshaft timing gear

Info

Publication number: CN204900746U
Application number: CN201520694509.0U
Authority: CN
Inventors: 王晓辉; 李国红; 陈美娟
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2015-09-09
Filing date: 2015-09-09
Publication date: 2015-12-23
Anticipated expiration: 2025-09-09

Abstract

The utility model discloses a crankshaft timing gear. This crankshaft timing gear includes: the gear body, its and camshaft timing gear meshing assembly, and the sign recess, set up the addendum face of gear body is used for aiming at camshaft gear's sign assembly in right time. This crankshaft timing gear observes the sign assembly in right time that sign groove position (having played the effect of mark in right time) aimed at camshaft gear through having beaten a sign recess above the tooth at crankshaft timing gear when the assembly, avoided crankshaft timing gear's mark in right time to be blocked by the rear end flange, can't observe the problem of crankshaft timing gear mark in right time at the built -up crankshaft in -process with regard to meetting, and then bring right time inaccurate, the unable working problem of engine.

Description

Crankshaft timing gear

Technical field

The utility model relates to engine assembly field, particularly a kind of crankshaft timing gear.

Background technique

In view of gear-driven reliability and convenience, gear structure is widely applied on the engine, because the bent axle of diesel engine and camshaft need to have certain phase relationship, generally print at the outside root portions of crankshaft timing gear 11 and camshaft timing gear 12 and have " 0 ", " 1 " or the mark 13 such as to get ready, convenient according to mark installment, ensure correct phase relationship, as shown in Figure 1.

For the starting of rear gear chamber of medium-sized discharge capacity, crankshaft timing gear 11 is assemblied on crankshaft rear end microcephaly, due to the needs that restriction and the bolt of flywheel of apparent size are arranged, after needing to increase by one on crankshaft rear end microcephaly, end flange 14 is used for installing and flywheel driven rotation (as shown in Figure 2) simultaneously.Comparatively large in view of flywheel output torque, rear end flange with bent axle adopt the mode of interference fit connect (crankshaft rear end flange be assembled to crankshaft rear end microcephaly upper after cannot pull down).Need crankshaft timing gear and rear end flange first to adopt the mode of heating to be assemblied in after on bent axle, then be assembled to together on complete machine.Because the size of rear end flange is comparatively larger than crankshaft timing gear external diameter, in installation process, the timing marks of crankshaft timing gear is blocked by rear end flange, just runs into the problem cannot observing crankshaft timing gear timing marks in built-up crankshaft process.Timing can be brought according to this inaccurate, the problem that motor cannot run well.

The information being disclosed in this background technique part is only intended to increase the understanding to general background of the present utility model, and should not be regarded as admitting or imply in any form that this information structure has been prior art that persons skilled in the art are known.

Model utility content

The purpose of this utility model is to provide a kind of simple and reasonable crankshaft timing gear, this crankshaft timing gear by being equipped with an indicia grooves above the tooth of crankshaft timing gear, the timing mark assembling of indicia grooves position (serving the effect of timing marks) alignment cam shaftgear is observed when assembling, the timing marks avoiding crankshaft timing gear is blocked by rear end flange, the problem cannot observing crankshaft timing gear timing marks is just run in built-up crankshaft process, and then bring timing inaccurate, the problem that motor cannot run well.

For achieving the above object, the utility model provides a kind of crankshaft timing gear, comprising: gear, and it engages with camshaft timing gear and assembles; And indicia grooves, be opened in the Topland of described gear, for aiming at the timing mark assembling of described camshaft gear wheel.

Preferably, in technique scheme, indicia grooves is opened in the neutral position of the Topland of this gear.

Preferably, in technique scheme, indicia grooves is half slot.

Preferably, in technique scheme, the width of indicia grooves is 0.7mm, and the degree of depth is 0.3mm.

Compared with prior art, the utility model has following beneficial effect: this crankshaft timing gear by being equipped with an indicia grooves above the tooth of crankshaft timing gear, the timing mark assembling of indicia grooves position (serving the effect of timing marks) alignment cam shaftgear is observed when assembling, the timing marks avoiding crankshaft timing gear is blocked by rear end flange, the problem cannot observing crankshaft timing gear timing marks is just run in built-up crankshaft process, and then bring timing inaccurate, the problem that motor cannot run well.

Accompanying drawing explanation

Fig. 1 is the structural representation of existing crankshaft timing gear.

Fig. 2 is the assembly structure schematic diagram of existing crankshaft timing gear.

Fig. 3 is the assembly structure schematic diagram of crankshaft timing gear of the present utility model.

Fig. 4 is the partial enlargement structural representation of crankshaft timing gear of the present utility model.

Embodiment

Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail, but is to be understood that protection domain of the present utility model not by the restriction of embodiment.

Clearly represent unless otherwise other, otherwise in whole specification and claims, term " comprise " or its conversion as " comprising " or " including " etc. by be understood to include the element of stating or constituent element, and do not get rid of other element or other constituent element.

Timing gear be in mechanical device to complete relevant control function play time scale location gear.Air inlet system and exhaust system in internal-combustion engine, all timing gear are introduced to the local system completing mechanical function and exist ordinal relation in clock and watch etc.Three kinds of kinds of drive of timing gear: chain transmission, Toothed Belts Gearing, gear transmission.

The positive and negative gear of current motorcar engine all adopts Toothed belt transmission, this kind of drive has that structure is simple, noise is little, the advantages such as smooth running, transmission accuracy are high, synchronism is good, but its intensity is lower, easily aging, tensile buckling or fracture after Long-Time Service, this Toothed belt is in outer cover, and in closed state, its working condition is observed in inconvenience.Have Mitsubishi's car, without starting sign, through oil, circuit investigation, fault still exists, and opens cyclinder head cover afterwards, finds that valve rocker does not work, predicates timing Toothed belt and fracture.After changing new product, motor still cannot start.Because be in operation once Toothed belt fractures, namely camshaft shuts down, bent axle will be rotated further certain angle or the number of turns under the rotator inertia of flywheel or the effect of transmission device inertia.Now motor can not work, and more seriously destroys port timing, and bending just at the valve stem of enable possition, causes the valve-closing be bent not tight by piston.So the motor of some Toothed belt that fractures, even if calibration timing gear marks again, after the timing Toothed belt more renewed, motor still not easily starts, or can start reluctantly, but it is abnormal to work, occurs that " tempering ", silencing apparatus " are blown out ", be short of power, phenomenon that noise increases.Only pull down cylinder head in the case, change valve, thoroughly could recover condition of the engine.

As shown in Figure 3 and Figure 4, according to specifically comprising of the crankshaft timing gear of the utility model embodiment: gear 21 and be opened in the indicia grooves 22 of Topland of this gear 21, this indicia grooves is opened in the Topland of this gear 21, the timing mark assembling of indicia grooves position (serving the effect of timing marks) alignment cam shaftgear is observed when assembling, the timing marks avoiding crankshaft timing gear is blocked by rear end flange 23, the problem cannot observing crankshaft timing gear timing marks is just run in built-up crankshaft process, and then bring timing inaccurate, the problem that motor cannot run well.

Specifically, indicia grooves 22 is opened in the neutral position of the Topland of this gear 21, observes the timing mark assembling of groove location (serving the effect of timing marks) alignment cam shaftgear when assembling.Indicia grooves 22 is opened in the neutral position of the Topland of gear 21, observes during convenient installation.Preferably, indicia grooves 22 is half slot, and the width of indicia grooves 22 is 0.7mm, and the degree of depth is 0.3mm, sees Fig. 3 and Fig. 4.The degree of depth of the indicia grooves 22 of this scheme is more shallow, can not cause gear cost increase, can not impact the strength of gear teeth and reliability.

To sum up, this crankshaft timing gear by being equipped with an indicia grooves above the tooth of crankshaft timing gear, the timing mark assembling of indicia grooves position (serving the effect of timing marks) alignment cam shaftgear is observed when assembling, the timing marks avoiding crankshaft timing gear is blocked by rear end flange, the problem cannot observing crankshaft timing gear timing marks is just run in built-up crankshaft process, and then bring timing inaccurate, the problem that motor cannot run well.

The aforementioned description to concrete exemplary of the present utility model is to illustrate and the object of illustration.These descriptions not want the utility model to be defined as disclosed precise forms, and obviously, according to above-mentioned instruction, can much change and change.The object selected exemplary embodiment and describe is to explain certain principles of the present utility model and practical application thereof, thus those skilled in the art can be realized and utilize various different exemplary of the present utility model and various different selection and change.Scope of the present utility model is intended to limited by claims and equivalents thereof.

Claims

1. a crankshaft timing gear, is characterized in that, comprising:

Gear, it engages with camshaft timing gear and assembles; And

Indicia grooves, is opened in the Topland of described gear, assembles for the timing mark of aiming at described camshaft gear wheel.

2. crankshaft timing gear according to claim 1, is characterized in that, described indicia grooves is opened in the neutral position of the Topland of this gear.

3. crankshaft timing gear according to claim 1, is characterized in that, described indicia grooves is half slot.

4. crankshaft timing gear according to claim 1, is characterized in that, the width of described indicia grooves is 0.7mm, and the degree of depth is 0.3mm.