JPH0415971Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a belt cover, and more specifically, to a cover for a belt used to transmit the rotational force of a crankshaft in an automobile engine to other parts. Regarding.

(Prior Art) As is well known, a belt is used to transmit the rotational force of a crankshaft of an automobile engine to other parts, such as a camshaft.

An example of a structure using such a belt is, for example, in a V-type engine. As shown in FIG. A first pulley attached to the side pulley 1 and a camshaft located on the cylinder head side.
A belt 4 is placed around the driven pulley 2 and a second driven pulley 3, which is included in one of the engine accessories such as a water pump and is located between the shafts of the first driven pulley 2, and is placed near the top of the driving pulley 1. There is one in which the tension of the belt 4 is adjusted by means of a tension roller 5 that contacts the belt 4 from the outside of the belt loop obtained by being hung on each pulley.

A belt cover 6 as shown in FIG. 6 is disposed around the belt 4 for the purpose of enclosing the belt 4 to make it waterproof and dustproof, or to prevent the belt from flying off when the belt breaks. .

That is, the belt cover 6 is a molded product having a dish-shaped cross section with the side facing the engine wall open and the bottom facing the side surface forming a flat surface, and surrounds the belt 4. The open bracket is bolted to the engine wall or to a stationary part near the wall.

(Problem to be solved by the invention) Inside the belt cover 6 described above, there is a belt 4.
A tension roller 5 for adjusting the tension of the tension roller 5 is housed in the tension roller 5. Although details are not shown, for example, an elastic member such as a spring is attached to a seat plate that pivotally supports the roller 5. is hooked, and is biased by this elastic member in a direction to abut against the belt 4 from the outside of the loop of the belt 4.

In addition, in FIGS. 5 and 6, for convenience, one end of an elastic member indicated by the reference numeral 7 is shown hooked to the support shaft of the tension roller 5 to express the presence of the elastic member.

By the way, this elastic member 7 is made to maintain sufficient durability and safety after having various characteristics such as durability including elastic force characteristics set in advance. If a load that exceeds the allowable strength is applied due to this situation, and the tension roller 5 is damaged, it will fall off the hook and fall toward the crankshaft located at the bottom of the tension roller 5, and will be attached to the crankshaft or the tension roller 5. There was a risk that the belt cover 6 would be damaged or the belt cover 6 would be caught between the pulley and the belt, causing the belt to break.

(Purpose of the invention) The object of the invention is to provide a cover for a belt that forms a drive transmission path having a structure in which an elastic member that gives the tension roller an elastic member is positioned above the crankshaft side. To obtain a belt cover capable of catching an elastic member when the member comes off from a latching position and tries to fall toward the crankshaft side, thereby preventing an accident in which the member is flipped off the crankshaft side.

(Means for Solving the Problem) In order to achieve the objective, the present invention has an elastic member for biasing the tension roller arranged above the drive unit such as the crankshaft inside the belt cover. In this case, a shelf is provided between the installation positions of the elastic member and the drive unit to catch the elastic member from falling.

(Example) The present invention will be explained below with reference to the illustrated example.

FIG. 1 is a perspective view corresponding to FIG. 6, and the same members as those shown in FIG. 6 are designated by the same symbols.

In FIG. 1, a spring 7 which is an elastic member
On the bottom inner wall surface of the belt cover 6, which corresponds to the area between the drive pulley 1 on the crankshaft side and the drive unit,
A shelf portion 6A whose protrusion height from the bottom of the belt cover 6 is set to match the coil diameter of the spring 7 is integrally molded.

As shown in FIG. 2, this shelf portion 6A has a length L that is approximately equal to or longer than the entire length of the spring 7.
, and both ends 6A1 in the length direction are set to the central part 6A.
The flat surface of 2 is inclined so that the spring 7 can be easily guided.

A reinforcing rib 6A3, one end of which is integrated with the bottom of the belt cover 6, is integrally molded into the bottom of the shelf 6A.

In the embodiment described above, the shelf portion 6A is obtained by integrally molding the belt cover 6, and after the belt cover 6 is mounted on the engine wall, the spring 7 is attached to the drive pulley 1 on the crankshaft side. When it tries to fall toward the direction, it is caught by the shelf section 6A and does not reach the drive pulley 1.

Moreover, the above-mentioned shelf 6A is not limited to setting its length so that it can receive a range corresponding to the entire length of the spring 7 by itself.
It is also possible to make a member located near the position of this shelf part 6A a part of the shelf part.

That is, as shown in FIG. 3, the belt cover 6 is penetrated with a pipe 8, which is a stationary member that connects, for example, a radiator (if shown) and a water jacket in the cylinder block of the engine. be.

As shown in FIG. 4, the position of this pipe 8 is taken as a part of the total length of the spring 7, and the length l including the position of this pipe 8 is made to correspond to the total length of the spring 7.

In the above-described embodiment, the length of the shelf itself may be short, and even when the length is short, it is possible to prevent the spring from falling, which is advantageous in terms of material cost.

(Effects of the invention) As described above, according to the invention, even if the elastic member for biasing the tension roller located above the drive part breaks, the elastic member that tries to fall toward the drive part Since the member can be caught before it reaches the drive unit, it is possible to prevent the fallen elastic member from being blown away by the rotational force of the drive unit.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a view taken along the - arrow in FIG. 3, FIG. 5 is a front view showing a belt drive configuration using an embodiment of the present invention, and FIG. 6 is a perspective view showing a conventional belt cover. 1... Drive pulley, 2, 3... Driven pulley, 4
... Belt, 5 ... Tension roller, 6 ... Belt cover, 6A ... Shelf section, 7 ... Elastic member.

Claims (1)

[Claims for Utility Model Registration] A belt that transmits driving force from a driving part such as an engine crankshaft to a pulley on a driven part such as a camshaft; and an elastic member that applies a bias in the direction of applying tension to the belt to a tension roller that comes into contact with the belt from the outside to adjust the tension of the belt, which is obtained by the belt that is attached to the belt. What is claimed is: 1. A belt cover that surrounds a belt, characterized in that a shelf is provided between the position of the drive unit and the position of the elastic member to catch the elastic member from falling.