RU35662U1 - Hydromechanical chain tensioner - Google Patents

Description

M88 and M11F 16 H 7/08

Hydromechanical chain tensioner

The invention relates to mechanical engineering and can be applied to the camshaft drive of internal combustion engines.

A hydromechanical device for tensioning chains is known, comprising a cfpus in the form of a hollow cylinder, on the inner surface of which annular grooves are made, a threaded cover, a spring-loaded plunger forming a plunger pair with a housing and having a groove with a stop element mounted to interface with the annular grooves of the housing, a cover has a channel for supplying oil and a ball check valve, while at the same time at least one annular groove with a stop element is installed on the plunger with the possibility of interfacing with the annular grooves of the housing, the pitch of the annular grooves of the plunger is not a multiple of the pitch of the grooves of the housing, and the annular grooves of the housing are made with a uniform step, in addition, the pitch of the grooves of the plunger is connected with the pitch of grooves of the housing in the following relation:

t is the pitch of the plunger grooves;

k is the step of the grooves of the housing;

p - the number of grooves of the plunger. RF patent No. 2156901 MShS7; F16 H 7/08 date publ. 09/27/2000

The closest analogue to the present invention is a hydromechanical device for chain tension, comprising a housing in the form of a hollow cylinder, a housing cover with an oil supply channel and a check valve.

t k + k / n,

a plunger coupled with a housing spring-loaded and forming a housing with annular elements to form a mounting capsule and a step mechanism for fixing the reverse stroke, while the housing cover is movable to form a second plunger pair with the housing, and a throttle hole is made in the housing from its lid side with the possibility of overlapping its outer surface of the housing cover. RF patent No. 2163986 IPC7: F 16 H 7/08 date publ. 03/10/2001

The technical result of the invention is to increase the availability and reliability of the hydromechanical device.

This result is achieved due to the fact that the hydromechanical device for tensioning the chain includes a housing in the form of a hollow cylinder, a housing cover with an oil supply channel and a check valve, spring-loaded and forming a plunger pair with the housing, a plunger with ring elements to form an assembly capsule and a step locking mechanism backstop. The housing is equipped with a throttle hole with a spring half ring and with the possibility of overlapping the throttle hole with the outer surface of the housing cover when moving it. The stop element of the mounting capsule is made in the form of a retaining ring interacting with the grooves of the housing, and the stepping mechanism for fixing the reverse stroke of the plunger is made in the form of two grooves on the plunger with fixed elastic rings installed in them. The rings interact with the grooves on the housing and the retaining ring. The pitch of the plunger grooves is associated with the pitch of the grooves of the housing as follows:

t 2k + k / n, and 1 h + 0.5S, where

t is the pitch of the grooves;

k is the step of the grooves of the housing;

h is the height of the lid; S is the stroke of the lid;

d is the diameter of the throttle hole;

d vn is the inner diameter of the housing;

a - coefficient 800

The hydromechanical device for chain tension is illustrated by the drawing of FIG. 1

and consists of a housing 1 in the form of a hollow cylinder, a housing cover 2 with a low-feed channel 3 and a check valve 4, a plunger 5 with a spring 6, forming a plunger pair. The housing 1 is equipped with a throttle hole 7 and a spring half ring 8, limiting the axial movement of the cover. Kryshkhka 2 during movement can block the throttle hole 7. In the housing 1, grooves 9, 10 are made and a stop element 11 is installed, which acts as a retaining ring. The stop element 11 and the groove 10 form a mounting capsule. On the plunger 5 in the annular grooves 12, 13 are fixed elastic rings 14, 15. The locking rings 14, 15 and grooves 9 form a stepped backward fixation mechanism.

The hydromechanical device for chain tensioning works as follows: before mounting the device in the product, the plunger 5 is fixed in the housing by means of a stop element 11 and a groove 10.

After installing the device in the product, the plunger 5 is released and the spring 6 through the plunger 5 and the shoe pulls the chain. In this case, the locking elastic rings 14, 15 occupy a position in the annular grooves 12, 13 of the housing 1 or in an intermediate position. After the start of the gas distribution mechanism, dynamic loads from the camshaft drive begin to move the plunger 5, the retaining rings 14.15 to the cover 2. At the same time, oil from the internal cavity enters through the opening 7 into the lubrication system, providing smooth damping of dynamic loads. If the hydraulic resistance of the hole 7 is not enough to ensure smooth damping, then there is an increase in its hydraulic

d dv / a, where

resistance by reducing its bore by the outer surface of the cover 2. Thus, the damping system automatically adjusts to the shock-free mode of operation. Oil losses are compensated from the engine lubrication system through the oil supply channel 3 and the check valve 4. In the event of a weakening of the force of the spring 6 from the oil pressure of the lubrication system, the housing 1 rests on the plunger 5 through the locking mechanism and the device starts to work in soft damping mode.

Thus, the proposed design solution limits the free return stroke of the plunger, provides soft damping of dynamic loads at any engine operating conditions, which increases the reliability and operability of the hydromechanical device for chain tension.

Claims (1)

A hydromechanical device for chain tension, including a housing in the form of a hollow cylinder, a housing cover with an oil supply channel and a check valve, spring-loaded and forming a plunger pair with the housing, a plunger with ring elements to form a mounting capsule and a step mechanism for fixing the reverse stroke, the housing is equipped with a throttle hole with spring semi-ring and with the possibility of overlapping the throttle hole with the outer surface of the housing cover when moving it, characterized in that the thrust element is mounting the first capsule is made in the form of a retaining ring interacting with the grooves of the housing, and the stepping mechanism for fixing the reverse stroke of the plunger is made in the form of two annular grooves on the plunger with fixing elastic rings installed in them, interacting with the grooves on the body and the retaining ring, while the pitch of the grooves of the plunger connected with the step of the grooves of the housing as follows: t≥2k + k / n, a l≥h + 0.5s, where t is the pitch of the grooves; k is the step of the grooves of the housing; n is the number of plunger grooves; l is the distance to the axis of the throttle hole; h is the height of the cover; s is the stroke of the lid; d≤ d _ext / α, where d is the diameter of the throttle hole; d _vn is the inner diameter of the housing; α - coefficient ≥800.