CN202391505U - Engine timing chain anti-drop device - Google Patents

Abstract

The utility model provides an engine timing chain anti-drop device, belonging to the technical field of vehicles. Through the utility model, the technical problems of tooth deviation of a crankshaft-end chain, wrong timing, inconvenient mounting and the like easily occurring in the process of mounting and replacing the timing chain system accessories of the existing engine timing chain anti-drop device are solved. The engine timing chain anti-drop device comprises a limiting block which is arranged below the timing chain and can prevent the timing chain from moving downwards; and the limiting block is fixed on an engine main bearing cover. The device provided by the utility model can prevent the crankshaft end of the timing chain from dropping and ensure correct timing of the timing chain; and meanwhile, the device has the advantages of simple structure, high reliability and the like, and is convenient to mount.

Description

A kind of engine timing chain chain-drop-proof device

Technical field

The utility model belongs to the vehicle technology field, relates to a kind of engine timing chain chain-drop-proof device.

Background technique

In the motor car engine working procedure; Air inlet, compression, acting, four processes of exhaust constantly take place in cylinder; And all will match with the motion state position of piston the opportunity of each step; The up-down of air inlet and exhaust and piston is coordinated each other, and this just must regulate through timing system.Timing system is given camshaft with energy transfer under the drive of engine crankshaft; Make the inlet and outlet door of motor open in due course or close; Guarantee cylinder ability normal suction and exhaust; Make fresh mixed gas or air be able in time get into cylinder, waste gas is able in time remove from inblock cylinder.

Existing automobile timing system normally drives the distribution device of motor through " Timing Belt " or " timing chain ", band transmission and the chain-driven promptly said usually.When adopting the band transmission; Because Timing Belt belongs to rubber components; Along with the increase of engine operating duration, wearing and tearing and aging all can take place like Timing Belt wheel, timing belt tensioner etc. in the annex of Timing Belt and Timing Belt; General working life is all at 4～80,000 kilometers, surpass 80,000 kilometers after user cost will increase greatly.Therefore in recent years; Chain drive system has been adopted in the transmission in correct time of motor car engine more and more widely; Chain-driven can overcome the many deficiencies on the band transmission performance; Have simultaneously that compact structure, transmitted power are high, reliability with wear resistance is high, design type is various, maintenance less, remarkable advantage such as long service life, chain-driven has demonstrated its wide market application prospect day by day.

But when adopting chain-driven, existing motor car engine is installing and is changing in the process of linkwork annex in correct time; When timing chain was lax, the timing chain crankshaft end was prone to cause crankshaft end chain to run tooth because the action of gravity meeting is dropped downwards; Cause the mistake in correct time, brought inconvenience to installation process.

Summary of the invention

The purpose of the utility model is to have the problems referred to above to existing technology, has proposed a kind of engine timing chain chain-drop-proof device, and this device can prevent that the timing chain crankshaft end from falling, and guarantees timing chain correct time.

The purpose of the utility model can realize through following technical proposal: a kind of engine timing chain chain-drop-proof device; This device comprises that being arranged at described timing chain below also can limit the limiting stopper that described timing chain moves down, and described limiting stopper is fixed on described main bearing of engine and covers.

Through limiting stopper is set below timing chain, installing and changing in the process of linkwork annex in correct time, when timing chain was lax, limiting stopper can limit the timing chain crankshaft end and move down, and guaranteed timing chain correct time to make installation process become convenient; When the timing chain tensioning, do not interfere between limiting stopper and the timing chain, do not influence the proper functioning of timing chain.In addition, limiting stopper directly is fixed on main bearing of engine and covers, and need not set up other fixing device and fix, and therefore has the advantage of compact structure, helps the integral layout of motor.

In above-mentioned engine timing chain chain-drop-proof device, described limiting stopper is positioned at the side-lower of described timing chain.This device is installed in main bearing of engine and covers; The underpart of timing chain is meshed with crankshaft timing gear, owing to be used to arrange that the space of this device is limited between main bearing cap and the engine timing chain, and therefore; Limiting stopper is arranged at the side-lower of timing chain; Make limiting stopper be positioned at crankshaft timing gear gravitational direction one side, can increase the space that is used for this device of layout, make on the basis that does not change the original design size of main bearing cap; Realize arranging this device, help the excellent quantification design of main bearing cap size.

In above-mentioned engine timing chain chain-drop-proof device, described limiting stopper comprises working part and positioning part, and described working part has a confined planes, and described confined planes is relative with described timing chain.The confined planes and the timing chain of working part are relative, and restriction timing chain crankshaft end moves down.

In above-mentioned engine timing chain chain-drop-proof device, described confined planes is curved.

In above-mentioned engine timing chain chain-drop-proof device, the inner concave of described confined planes is relative with described timing chain.Confined planes is designed to arc, makes confined planes parallel with the timing chain lower end surface, has increased the position-limiting action area of limiting stopper, thus castering action effect to a great extent, and can prevent better that timing chain from falling to producing and take off chain.

In above-mentioned engine timing chain chain-drop-proof device, described positioning part is positioned at described main bearing of engine and covers.

In above-mentioned engine timing chain chain-drop-proof device, described positioning part is fastened on described main bearing of engine through bolt and covers.Bolt is conveniently carried out dismounting, maintenance to this engine timing chain chain-drop-proof device and is followed and change.

In above-mentioned engine timing chain chain-drop-proof device, described positioning part is fastened on described main bearing of engine through rivet and covers.

Compared with prior art, this engine timing chain chain-drop-proof device has the following advantages:

1, this engine timing chain chain-drop-proof device is through being provided with limiting stopper below timing chain, and restriction timing chain crankshaft end moves down, thereby guarantees timing chain correct time, makes the installation of linkwork in correct time and replacing become convenient.

2, the limiting stopper of this engine timing chain chain-drop-proof device is arranged at the side-lower of timing chain; Therefore can on the basis that does not change the original design size of main bearing cap, carry out the layout of this device; Have compact structure, convenient installation, help the integral layout of motor.

3, the confined planes of limiting stopper is designed to arc, and the active area through increasing confined planes has improved the reliability of this device to a great extent to promote service behaviour.

4, this engine timing chain chain-drop-proof device have simple in structure, reliability is high, advantage such as easy for installation.

Description of drawings

Fig. 1 is the main TV structure schematic representation of this engine timing chain chain-drop-proof device.

Fig. 2 is the sectional structure schematic representation of A-A among Fig. 1.

Fig. 3 is the assembly relation schematic representation of this engine timing chain chain-drop-proof device and main bearing cap.

Fig. 4 is the assembly relation schematic representation of this engine timing chain chain-drop-proof device and timing chain.

Fig. 5 is the ssembly drawing of this engine timing chain chain-drop-proof device.

Among the figure, 1, limiting stopper; 2, main bearing cap; 3, timing chain; 4, working part; 5, positioning part; 6, confined planes; 7, bolt.

Embodiment

Below be the specific embodiment of the utility model and combine accompanying drawing, the technological scheme of the utility model is done further to describe, but the utility model is not limited to these embodiments.

Like Fig. 1, shown in Figure 2, this engine timing chain 3 chain-drop-proof devices comprise limiting stopper 1, and limiting stopper 1 comprises working part 4 and positioning part 5.

Specifically, like Fig. 3, Fig. 4, shown in Figure 5, limiting stopper 1 is arranged on the main bearing cap 2; And limiting stopper 1 is positioned at timing chain 3 belows; Usually for easy for installation, design limiting stopper 1 is positioned at the side-lower of timing chain 3, makes limiting stopper be positioned at crankshaft timing gear gravitational direction one side; Thereby on the basis that does not change main bearing cap 2 original design sizes, just can realize arranging this device, and then help the integral layout of motor.The working part 4 of limiting stopper 1 has a confined planes 6; This confined planes 6 is curved and inner concave confined planes 6 is relative with timing chain 3; When timing chain 3 crankshaft ends produce under weight; Confined planes 6 can limit timing chain 3 crankshaft ends and move down, thereby guarantees 3 correct time of timing chain.When timing chain 3 tensionings, confined planes 6 is not interfered with timing chain 3, does not influence timing chain 3 work.Limiting stopper 1 is fixed on the main bearing cap 2 through its positioning part 5; Positioning part 5 can adopt modes such as bolt 7 connections, rivet connection to be fixed on the main bearing of engine lid 2; But as preferred; This engine timing chain 3 chain-drop-proof devices adopt bolt 7 ways of connecting that the positioning part 5 of limiting stopper 1 is fixed on the main bearing cap 2, so that in case of necessity this device is carried out dismounting, maintenance and follow and change.

Specific embodiment described herein only is that the utility model spirit is illustrated.The utility model person of ordinary skill in the field can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from the spirit of the utility model or surmount the defined scope of appended claims.Although this paper has used terms such as limiting stopper 1, working part 4, positioning part 5, confined planes 6 morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain the essence of the utility model more easily; It all is contrary with the utility model spirit being construed to any additional restriction to them.

Claims (8)

1. engine timing chain chain-drop-proof device; It is characterized in that; This device comprises that being arranged at described timing chain (3) below also can limit the limiting stopper (1) that described timing chain (3) moves down, and described limiting stopper (1) is fixed on the described main bearing of engine lid (2).

2. engine timing chain chain-drop-proof device according to claim 1 is characterized in that described limiting stopper (1) is positioned at the side-lower of described timing chain (3).

3. engine timing chain chain-drop-proof device according to claim 2; It is characterized in that; Described limiting stopper (1) comprises working part (4) and positioning part (5), and described working part (4) has a confined planes (6), and described confined planes (6) is relative with described timing chain (3).

4. engine timing chain chain-drop-proof device according to claim 3 is characterized in that described confined planes (6) is curved.

5. engine timing chain chain-drop-proof device according to claim 4 is characterized in that, the inner concave of described confined planes (6) and described timing chain (3) are relative.

6. according to claim 3 or 4 or 5 described engine timing chain chain-drop-proof devices, it is characterized in that described positioning part (5) are positioned on the described main bearing of engine lid (2).

7. engine timing chain chain-drop-proof device according to claim 6 is characterized in that, described positioning part (5) are fastened on the described main bearing of engine lid (2) through bolt.

8. engine timing chain chain-drop-proof device according to claim 6 is characterized in that, described positioning part (5) are fastened on the described main bearing of engine lid (2) through rivet.

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