CN201425084Y

CN201425084Y - Automatic chain tightener

Info

Publication number: CN201425084Y
Application number: CN 200920081244
Authority: CN
Inventors: 谭建伟; 阳宇; 李严帅
Original assignee: Mianyang Fulin Precision Machinery Co Ltd
Current assignee: Mianyang Fulin Precision Machinery Co Ltd
Priority date: 2009-05-31
Filing date: 2009-05-31
Publication date: 2010-03-17
Anticipated expiration: 2019-05-31

Abstract

The utility model discloses an automatic chain tightener, which relates to a chain tightener used for an engine, and aims to provide an automatic chain tightener which can well ensure the valve distribution phase of the distribution structure of the engine and effectively reduce vibration of the engine chain. The automatic chain tightener adopts the following technical scheme: by designing an airdrain on the casing, air can be rapidly drained when the automatic chain tightener enters the working state; in addition, a retaining angle is arranged between the inner screw plug and the plunger, sothat the plunger and the inner screw plug can be retained, and the valve distribution phase timing of the distribution mechanism of the engine is ensured; moreover, the opposite force borne by the plunger is larger than the opposite force borne by various prior tighteners, thereby well avoiding the valve distribution phase misplacement caused by the damage to the tightener. The automatic chain tightener is mainly applied for tightening the chain of the engine.

Description

Automatic chain tensioning device

Technical field

The utility model relates to a kind of chain tensioning device, particularly relates to a kind of automatic chain tensioning device that is used on the motor.

Background technique

The hydraulic chain automatic tensioner that available engine adopts, exhaust is very difficult before reaching normal working, it is slow to enter working state, and the turbidity test of this type of stretcher inner body require very high, and particularly the requirement of the turbidity test of one-way valve system structure is high, may cause stretcher to feel like jelly or catching phenomenon when the turbidity test of product are overproof, stretcher was lost efficacy, cause the vibration of chain to strengthen, noise strengthens, port timing dislocation when serious.On the other hand, the automatic chain tensioning device of pawl structures formula that available engine adopts, the plunger amount of axial movement of this structure is bigger, the vibration of chain, noise is big; The strength deficiency of ratchet damages that easily stretcher was lost efficacy.

The model utility content

For overcoming the shortcoming in the middle of the prior art, the utility model will provide a kind of automatic chain tensioning device that can well guarantee the port timing of engines distribution structure and can effectively reduce the engine chain vibrations.

The purpose of this utility model realizes by following technical proposal: automatic chain tensioning device, the shell that comprises hollow structure, the enclosure bottom is provided with a unidirectional valve seat, be provided with an one-way valve in the unidirectional valve seat, import one side of one-way valve is provided with the oil input channel that is used for enclosure and external means connection, one end and the one-way valve seated connection of interior plug screw touch, the part outer wall of the other end of interior plug screw is inserted in the inside of plunger and is connected by screw thread on the interior plug screw outer wall and the mutual spiral of screw thread on the plunger inwall, slidably cooperate for sealing between the outer wall of plunger place part in shell and the outer casing inner wall, the other end of plunger from enclosure stretch out and its top end face with lead carrier bar and contact, also comprise a return spring, plug screw was near the inner tip of a side of unidirectional valve seat in one end of return spring was connected, the other end of return spring passes and withstands on the close inner tip of leading carrier bar one side of plunger from the opposite side top of interior plug screw, be formed with a housing cavity between shell and the interior plug screw, comprise that also is positioned at an air outlet flue that is used for the gas of housing cavity is discharged to housing exterior on the shell.

The outlet end of described air outlet flue is provided with a screw, and the position of screw and housing contacts is provided with a spring pad.

Design on the outer wall thread of plug screw in described to have and prevent that already installed interior plug screw from continuing to enter into the anti-back corner of plunger inside under the effect that is subjected to the plunger end thrust.

From structure characteristic of the present utility model as can be seen, advantage of the present utility model is: make its exhaust fast when entering working state by the designing and arranging air flue, reduce the engine start vibration of chain just; The utility model requires relatively the end of than the turbidity test of oil product simultaneously, avoids causing chain system to lose efficacy because of the turbidity test of oil product; Anti-back corner by being provided with between interior plug screw and plunger makes to have retaining between plunger and the interior plug screw in addition, has guaranteed the port timing timing of engine valve actuating mechanism; And the opposite force that plunger bears is bigger than existing various stretchers, has well avoided stretcher to damage the port timing that is caused and has misplaced.

Description of drawings

Fig. 1 is a structural representation of the present utility model

Wherein reference character 1 is that shell 2 is that unidirectional valve seat 3 is that one-way valve 4 is oil input channels

The 5th, interior plug screw 6 is that plunger 7 is that to lead carrier bar 8 are return springs

The 9th, housing cavity 10 is that air outlet flue 11 is that screw 12 is spring pads

The 13rd, anti-back corner

Embodiment

Below in conjunction with accompanying drawing the utility model is described further:

Preferred embodiment

Automatic chain tensioning device as shown in Figure 1, the shell 1 that comprises hollow structure, shell 1 inner bottom is provided with a unidirectional valve seat 2, be provided with an one-way valve 3 in the unidirectional valve seat 2, import one side of one-way valve 3 is provided with the oil input channel 4 that is used for shell 1 inside and outside device connection, one end of interior plug screw 5 contacts with unidirectional valve seat 2, the part outer wall of the other end of interior plug screw 5 is inserted in the inside of plunger 6 and is connected by screw thread on interior plug screw 5 outer walls and the mutual spiral of screw thread on plunger 6 inwalls, slidably cooperate for sealing between the outer wall of plunger 6 place part in shell 1 and shell 1 inwall, the other end of plunger 6 stretch out from shell 1 inside and its top end face with lead carrier bar 7 and contact, also comprise a return spring 8, plug screw 5 was near the inner tip of a side of unidirectional valve seat 2 in one end of return spring 8 was connected, the other end of return spring 8 passes and withstands on the close inner tip of leading carrier bar 7 one sides of plunger 6 from the opposite side top of interior plug screw 5, be formed with a housing cavity 9 between shell 1 and the interior plug screw 5, comprise that also is positioned at an air outlet flue 10 that is used for the gas of housing cavity 9 is discharged to shell 1 outside on the shell 1.

The outlet end of described air outlet flue 10 is provided with a screw 11, and the position that screw 11 contacts with shell 1 is provided with a spring pad 12.

Design on the outer wall thread of plug screw 5 in described to have and prevent that already installed interior plug screw 5 from continuing to enter into the anti-back corner 13 of plunger 6 inside under the effect that is subjected to plunger 6 end thrusts.

Claims

1, automatic chain tensioning device, the shell (1) that comprises hollow structure, shell (1) inner bottom is provided with a unidirectional valve seat (2), be provided with an one-way valve (3) in the unidirectional valve seat (2), import one side of one-way valve (3) is provided with the oil input channel (4) that is used for the inside and outside device connection of shell (1), one end of interior plug screw (5) contacts with unidirectional valve seat (2), the part outer wall of the other end of interior plug screw (5) is inserted in the inside of plunger (6) and is connected by the mutual spiral of screw thread on screw thread on interior plug screw (5) outer wall and plunger (6) inwall, slidably cooperate for sealing between the outer wall that plunger (6) is positioned at shell (1) place part and shell (1) inwall, the other end of plunger (6) stretch out from shell (1) inside and its top end face with lead carrier bar (7) and contact, also comprise a return spring (8), one end of return spring (8) is connected the inner tip of interior plug screw (5) near a side of unidirectional valve seat (2), the other end of return spring (8) passes and withstands on the close inner tip of leading carrier bar (7) one sides of plunger (6) from the opposite side top of interior plug screw (5), be formed with a housing cavity (9) between shell (1) and the interior plug screw (5), it is characterized in that also comprising one and be positioned at the air outlet flue (10) that is used for the gas of housing cavity (9) is discharged to shell (1) outside on the shell (1).

2, automatic chain tensioning device according to claim 1 is characterized in that the outlet end of described air outlet flue (10) is provided with a screw (11), and the position that screw (11) contacts with shell (1) is provided with a spring pad (12).

3, automatic chain tensioning device according to claim 1, it is characterized in that described on the outer wall thread of plug screw (5) design have prevent already installed in plug screw (5) under the effect that is subjected to plunger (6) end thrust, continue to enter into the inner anti-back corner (13) of plunger (6).