A SHOCK ABSORBER WHICH IS SENSITIVE TO TEMPERATURE CHANGES TECHNICAL FIELD

The present invention relates to a shock absorber which is sensitive to temperature changes and which is particularly used in industrial furnaces which are subject to high temperatures in order to be used in pluralities of fields of industry and in different products like motorized vehicles.

PRIOR ART

It is known that shock absorbers are used for mitigating the intensity and effect of vibrations occurring during operation of the motorized vehicles or machines. The shock absorbers, which function according to the non-compression principle of the liquids, generally comprise a helical spring, shaft and piston members connected to each other downwardly inside an outer body in cylindrical form comprising liquid therein. Piston moves downwardly and upwardly inside the body, and it compresses the liquid existing therein. This liquid, passing through pluralities of circular openings provided on the piston, moves between the front side and the back side of the piston. Impact absorbance is realized by means of compression of the liquid, and the piston returns to the prior position thereof by means of the spring. Oil is used as the liquid, and there are embodiments which function by means of gas. The shock absorbers, where oil is used, are named as hydraulic shock absorber, and in summary, as the piston compresses the oil provided at the front and at the back during the upward- downward movement of the piston, a resistance is formed as oil flows through the openings provided thereon, and the impact is dampened as a result of the effect of this resistance.

The viscosity, in other words, the liquidity of the oil passing through the openings during the upward-downward movement of the piston is very important. Since the viscosity of the oil is influenced due to the temperature differences which may occur, the resistance, which is formed during passage thereof through the openings provided on the piston, will be influenced depending on this. Due to this, the dampening of the incoming impact by the shock absorber will be deteriorated, and thus, the functions of the shock absorber will be deteriorated. Particularly in processes which function at high temperature differences, the shock absorber design is substantially difficult. For instance, soft close shock absorber system, which provides soft closing, is used on furnace doors particularly on industrial furnaces. The impact dampening oil, provided in these shock absorbers, loses its viscose effect at high temperatures. This prevents soft closing of the furnace cover. In order to prevent this problem, in other words, in order to protect the function of the shock absorbers from high temperatures, a limited and inefficient design is made which is isolated against temperature or which provides keeping in regions which are not effected by temperature, and this reduces the temperature difference limitation to the material resistance axis, and leads to nonfunctioning of the shock absorber at long operation durations.

As a result, because of all of the abovementioned problems, an improvement is required in the related technical field.

BRIEF DESCRIPTION OF THE INVENTION

The present invention relates to a shock absorber which is sensitive to temperature changes, for eliminating the above mentioned disadvantages and for bringing new advantages to the related technical field.

The main object of the present invention is to provide a shock absorber which is sensitive to temperature changes which can fulfil its function at different temperatures.

In order to realize all of the abovementioned objects and the objects which are to be deducted from the detailed description below, the present invention is a shock absorber which is sensitive to temperature changes in order to be used in different products like motorized vehicles and in pluralities of fields of industry and particularly used in industrial furnaces which are subject to high temperatures, said shock absorber comprising a pressure tube including oil therein; a carrier which firstly meets the impact applied from outside; a spring positioned between said pressure tube and said carrier; a shaft connected to the carrier and extending into the pressure tube; and a piston having at least one opening positioned into the pressure tube in order to dampen the impact applied from outside in a connected manner to said shaft; characterized in that said piston comprises a chamber housing wherein a chamber including liquid expanding as a result of temperature increase is positioned; at least one tunnel extending from said chamber housing towards said opening; at least one movement rod positioned in said tunnel and moving linearly between the opening and the chamber housing inside the tunnel as a result of expansion of said chamber; and at least one pressure spring positioned between the chamber and said movement rod. Thus, the chamber expands at high operating temperatures, and pushes the movement rods towards the opening, and leads to narrowing of the diameter of the opening, and thus, it provides passage of the low viscosity oil. This provides the shock absorber to dampen the impacts also at high temperatures.

In a preferred embodiment of the subject matter invention, the piston comprises an upper block and a lower block and a connection element encircling in order to provide interconnection of said upper block and said lower block.

In another preferred embodiment of the subject matter invention, the upper block comprises an upper groove on the side thereof facing the lower block, at least one upper rod channel, and at least one upper channel provided on the outer wall thereof.

In another preferred embodiment of the subject matter invention, the lower block comprises a lower groove on the side thereof facing the upper block, at least one lower rod channel, and at least one lower channel provided on the outer wall thereof.

In another preferred embodiment of the subject matter invention, said connection element comprises at least one channel provided on the inner wall thereof.

In another preferred embodiment of the subject matter invention, the chamber housing is provided by joining said upper groove, provided on the upper block, to said lower groove provided on the lower block corresponding thereto. Thus, a gap is provided wherein the temperature sensitive liquid can be put.

In another preferred embodiment of the subject matter invention, the tunnel is provided by joining said upper rod channel, provided on the upper block, to said lower rod channel provided on the lower block corresponding thereto. Thus, a gap is provided wherein the movement rod can be positioned.

In another preferred embodiment of the subject matter invention, the opening is provided by means of connection of said lower channel, provided on said lower block and of said upper channel provided on the upper block, in a manner corresponding to said channel provided on the inner wall of the connection element. Thus, a gap is provided through which the oil passes as a result of the effect of the pressure applied by the piston to the oil.

BRIEF DESCRIPTION OF THE FIGURES In Figure 1 , a representative general view of a shock absorber which is sensitive to temperature changes is given.

In Figure 2, an exploded representative view of the piston is given. REFERENCE NUMBERS

10 Pressure Tube

20 Spring

30 Shaft

40 Piston

41 Connection Element

411 Channel

42 Upper Block

421 Upper Groove

422 Upper Rod Channel

423 Upper Channel

43 Chamber

44 Pressure Spring

45 Movement Rod

46 Lower Block

461 Lower Groove

462 Lower Rod Channel

463 Lower Channel

47 Opening

48 Tunnel

49 Chamber Housing

50 Carrier

THE DETAILED DESCRIPTION OF THE INVENTION

In this detailed description, the subject matter shock absorber which is sensitive to temperature changes used in industrial furnaces which are particularly subject to high temperatures in order to be used in various fields of industry and in motorized vehicles, is explained with references to examples without forming any restrictive effect in order to make the subject more understandable. The subject matter shock absorber, whose representative is given in Figure 1 and which is sensitive to temperature changes, generally comprises a cylindrical pressure tube (10), at least one carrier (50) positioned on said pressure tube (10) by means of at least one spring (20), and a piston (40) connected to a shaft (30) extending into the pressure tube (10) from the middle of said spring (20) in a manner connected to said carrier (50). A liquid is positioned into the pressure tube (10), and the upper section thereof is covered by a cover (not illustrated in the figure) comprising a sealing element (not illustrated in the figure). Preferably oil is used as liquid, and it will be described as mentioned in the following descriptions.

The spring (20) is positioned on the pressure tube (10), and the carrier (50) is positioned on the spring (20), and said shaft (30) connected to the carrier (50) extends into the pressure tube (10). The shaft (30) is connected to said piston (40), which is in disc form, inside the pressure tube (10). The piston (40) is positioned in the pressure tube (10) such that there is oil above and under or at the front and at the rear with respect to the position of the pressure tube (10).

The piston (40), whose exploded view is given in Figure 2, comprises the main items of a connection element (41) in ring form which provides bedding for the pieces, and an upper block (42) positioned in the middle of said connection element (41), and a lower block (46). Said upper block (42) and said lower block (46) are joined at the center of the connection element (41) so as to be under each other, and it is connected to the carrier (50) through the upper block (42) by means of the shaft (30). By means of said embodiment of the connection element (41), the upper block (42) and the lower block (46) in diskette form, the piston (40) embodiment is provided which moves inside the pressure tube (10).

At least one channel (411) is provided on the inner wall of the connection element (41), at least one upper channel (423) is provided on the lateral wall of the upper block (42) in a manner corresponding to said channel (411), and at least one lower channel (463) is provided on the side wall of the lower block (46) in a manner corresponding to the channel (411 ). In other words, at least one opening (47) is formed in a place which is close to the edges of the piston (40) which is formed by means of the connection of the upper block (42) and the lower block (46) to the connection element (41). Thus, oil passage through said opening (47) is provided in the downward-upward movement of the piston (40).

At the center of the upper block (42) facing the lower block (46), an upper groove (421) is provided and at least one upper rod channel (422) is provided extending from said upper groove (421) to the outer wall and which joins with said upper channel (423). Again, in the same manner, a lower groove (461) is provided at the center of the lower block (46) facing the upper block (42), and at least one lower rod channel (462) is provided which joins with said lower channel (463) and which extends from said lower groove (461) towards the outer wall. By means of mutual positioning of the upper block (42) and the lower block (46), a tunnel (48) is provided which is formed by mutual positioning of said upper rod channel (422) and said lower rod channel (462) which extends towards the opening (47) from a chamber housing (49) provided by the upper groove (421) and by the lower groove (461).

In said chamber housing (49) provided by means of connecting the upper block (42) and the lower block (46) by means of the connection element (41 ), there is a chamber (43) including liquid therein which expands or contracts depending on temperature and formed by polymer material which is resistant to heat. Said chamber (43) is connected by means of at least one press spring (44). Inside said tunnel (48), there is at least one movement rod (45) connected to said press spring (44). Said movement rod (45) moves inside the tunnel (48) between the chamber housing (49) and the opening (47) according to the expansion or contraction condition of the liquid provided inside the chamber (43). In other words; depending on the movement of the movement rod (45), the diameter of the opening (47), through which the oil passes, narrows or expands. When the viscosity of the oil increases at high temperatures, the liquid inside the chamber (43) expands, and it provides pushing of the movement rods (45) towards the opening (47) by means of the press springs (44) of the chamber (43). Thus, since the opening (47) will be ^' narrowed, the passage of the oil, whose fluidity has increased, becomes difficult. This provides the hydraulic shock absorber to fulfill its function also at high temperatures.

In the present shock absorber embodiments, since the viscosity of the oil increases at high temperatures, the passage of the oil through the openings (47), provided on the piston (40), is facilitated thanks to the pressure formed on the oil by the piston (40) in order to dampen the effect of the impact applied on the carrier (50). This prevents the shock absorber from realizing the sufficient dampening. However, by means of the subject matter shock absorber embodiment which is sensitive to temperature changes, the shock absorber can also function at high temperatures. In case the ambient temperature decreases, the liquid, provided in the chamber (43), returns to the prior volumetric structure again, and it provides the movement rods (45) to return to the prior position thereof thanks to the press spring (44). Thus, the shock absorber completely fulfills its function under normal ambient conditions. As a result, the design limitations, which are required for enclosing the shock absorber, are prevented due to the high ternperature differences by means of a shock absorber which is sensitive to temperature changes. The shock absorber can function without dampening loss also at very high temperatures. The doors of furnaces, which function at high temperatures, are closed in a compliant manner to the soft closing technology, and the impact dampening characteristic of the shock absorber becomes long-termed.

The protection scope of the present invention is set forth in the annexed Claims and cannot be restricted to the illustrative disclosures given above, under the detailed description. It is because a person skilled in the relevant art can obviously produce similar embodiments under the light of the foregoing disclosures, without departing from the main principles of the present invention.