JP5815683B2 - Tension applying device for applying tension to pulling means - Google Patents

Description

The present invention relates to a tension applying device for applying tension to a pull-type winding means or pulling means (Zugmittel) of an internal combustion engine, which is a rail supported by a turning point on the end side, A rail formed so that a back surface of the rail opposite to the pulling means forms, together with an abutment surface extending along the internal combustion engine, a chamber that tapers toward the turning point of the rail; The present invention relates to a tension applying device that applies tension to a pulling means of an internal combustion engine, and includes a pressurized slider that is applied with a spring force in a tapering direction of the chamber along a contact surface.

BACKGROUND ART A tension applying device of the above type is known from JP2009-257455A. The above patent specification shows a tensioning device that compensates for the elongation of the pulling means by means of a rail supported at the pivot point on the end side. In this case, a slider to which a spring force is applied is disposed between the rail and the contact surface of the internal combustion engine. The contact surface and the rail form a chamber that tapers toward the pivot point of the rail. The spring that pushes the slider in the taper direction of the chamber is formed as a compression spring. One end of the compression spring is supported by an additional contact surface of the internal combustion engine, and the other end is supported by a slider.

The problem underlying the present invention is to provide a tensioning device that is inexpensive and easy to assemble.

SUMMARY OF THE INVENTION In order to solve the above-described problems, in the configuration according to the present invention, a spring is attached to the end of the rail on the pivot point side at the first spring end, and at the second spring end. , So that it is attached to the slider. A special advantage in this case is that no additional contact surfaces need to be attached to the internal combustion engine. The tensioning device can be supplied and assembled as one complete structural part.

  According to another advantageous aspect of the invention, the rail has two side surfaces adjacent to its back surface, such that at least one of the side surfaces has a guide tongue. It has become. The guide tongue engages in at least one guide groove extending in the longitudinal direction processed laterally on the slider. This prevents lateral movement or rotation of the rail. In inexpensive manufacturing of the tension applying device, both the rail and the slider are manufactured from plastic by an injection molding method.

  In an advantageous embodiment of the invention, the spring pulling the slider in the taper direction of the chamber is a tension spring. According to another advantageous aspect of the invention, the rail is placed on the abutment surface between a rail end supported at the pivot point and a rail end located on the opposite side of the rail end. It has a projecting protrusion that extends toward it. This projecting portion is formed so as to form a chamber that tapers toward the turning point of the rail together with the contact surface. Rotational non-uniformity (Drehungleichfoermigkeit) caused by the combustion process of an internal combustion engine frequently causes alternating acceleration and deceleration phases. This results in an oscillating movement of the pulling means. In order to damp vibrations of the pulling means, rails made from a flexible material are used. Furthermore, in order to achieve sufficient rigidity of the rail, it is desirable that the rail is partially reinforced. Since the protruding portion extending in a convex shape on the back surface of the rail increases the rigidity of the rail, excessive bending during pressurization is avoided.

  The embodiment of the present invention will be described in detail with reference to FIGS.

It is the schematic of the winding transmission device which has a tension | tensile_strength provision apparatus. FIG. 2 is a schematic view of a winding transmission device having a tension applying device with an additional guide device; It is detail drawing which shows a guide apparatus in a cross section.

  FIG. 1 schematically shows a winding transmission (Zugmitteltrieb) provided in an internal combustion engine. The winding transmission has a drive wheel 12, a driven wheel 13, and a pull-type winding means or pulling means (Zugmittel) 2 wound around both wheels. Based on the wear, stretching of the pulling means 2 may occur, that is, the pulling means 2 may become long. This elongation must be compensated by applying a tension to the pulling means 2 later using a tensioning device 1 as illustrated in FIG. The tension applying device 1 has a rail 3 that is rotatably supported at a turning point on the end side. The pulling means 2 slides along the front of the rail 3. The back surface of the rail 3 forms a chamber that tapers in the direction of the turning point 14 of the rail 3 together with the contact surface 8 provided in the internal combustion engine. On the back surface of the rail 3, an additional protrusion 9 is disposed between the rail end 6a supported at the turning point and the rail end 6b located on the opposite side of the rail end 6a. Yes. This protrusion 9 extends towards the contact surface 8, whereby the chamber between the rail 3 and the contact surface 8 is additionally narrowed. A slider 7 is movably disposed between the protruding portion 9 and the contact surface 8. In this case, the slider 7 is in contact with the protruding portion 9 and the contact surface 8. The slider 7 is further coupled via a tension spring 4 to a rail end 6a supported at the turning point. As a result, a force is applied to the slider 7 in the direction of the turning point 14 of the rail 3.

  Further, the functional form of the tension applying device 1 will be described in detail. The pulling means 2 presses the rail 3 in a tension state. On the other hand, the rail 3 presses the slider 7 applied to the contact surface 8. As long as the frictional force acting on the slider 7 related to the force acting on the rail 3 is stronger than the pulling force of the spring 4 acting on the slider 7, the slider 7 is held in that position. Only when the pulling means 2 is extended and the force acting on the rail 3 is weakened, the frictional force is reduced, and the slider 7 is pulled in the taper direction of the chamber by the spring force. The slider 7 is formed in a wedge shape. In this case, the tapered end of the slider 7 faces the direction of the turning point 14 of the rail 3. Since the applied slider 7 is pressed between the contact surface 8 and the back surface of the rail 3, the rail 3 turns around the turning point 14 toward the pulling means 2 to be tensioned. Thereby, the tension | tensile_strength means 2 provided with the tension presses the rail 3 anew. Since the force transmitted from the rail 3 to the slider 7 increases the frictional force in the slider 7, the slider 7 is held at a new position. As a result, it is possible to dynamically and continuously apply tension to the pulling means 2 later.

  FIG. 2 shows another form of the tensioning device 1 described in FIG. 1 according to the invention. In this embodiment, the slider 7 of the tension applying device 1 is additionally linearly guided. The linear guide has a guide tongue 11. This guide tongue 11 is arranged on the rail 3 on the side, and in this case extends in the direction of the slider 7. The guide tongue 11 engages in the guide groove 10 laterally, thereby preventing the slider 7 from losing frictional contact with the rail 3 or the protrusion 9.

  FIG. 3 shows a cross-sectional view of the linear guide described in FIG. In this embodiment, the rail 3 has two guide tongues 11. These guide tongues 11 engage laterally with guide grooves 10 provided for the guide tongues 11 of the slider 7. With this device, the protrusion 9 of the rail 3 is applied to the slider 7 in a planar shape, and it is guaranteed that the rotation of the slider 7 is prevented.

DESCRIPTION OF SYMBOLS 1 Tension applying device 2 Pulling means 3 Rail 4 Spring 5a Spring end 5b Spring end 6a Rail end 6b Rail end 7 Slider 8 Abutment surface 9 Projection 10 Guide tongue 11 Guide groove 12 Drive wheel 13 Driven wheel 14 Turning point

Claims (3)

A rail (3) supported at a turning point on the end side, and a back surface of the rail (3) located on the side opposite to the pulling means (2) extends along the internal combustion engine. (8) and a rail (3) formed to form a chamber that tapers toward the pivot point (14) of the rail (3);
A pressurized slider (7) with a spring (4) force applied in a tapering direction of the chamber along the abutment surface (8),
In the tension applying device (1) for applying tension to the pulling means (2) of the internal combustion engine,
Said spring (4) is a first spring end (5a), said rail (3) have been pivoted to an end portion of the pivot point side, the second spring end (5b), said slider It is pivotally connected to the (7),
The rail (3) has two side surfaces adjacent to the back surface thereof, each side surface has a guide tongue piece (11), and each guide tongue piece (11) has the slider ( 7) Engage in the longitudinally extending guide grooves (10) each machined laterally to
Both ends of each guide groove (10) terminate in the slider (7), and the tension applying device for applying tension to the pulling means of the internal combustion engine.   2. The tensioning device according to claim 1, wherein the spring (4) is a tension spring. The rail (3) is disposed between the rail end (6a) supported at the turning point and the rail end (6b) located on the side opposite to the rail end (6a). The projection (9) extends toward the surface (8), and the projection (9) includes the contact surface (8) and the turning point (14) of the rail (3). 3. The tension applying device according to claim 1, wherein the tension applying device is formed so as to form the chamber that is tapered toward the outer surface.

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