JPS62124344A - Thrust applying device - Google Patents

Abstract

PURPOSE:To prevent a change of the total capacity of a cavity portion by forming an adjusting chamber to cancel the increase and decrease of the capacity of the cavity portion with the increase and decrease of the capacity of the adjusting chamber. CONSTITUTION:A partition plate 90 is formed in such a manner that the outside diameter thereof is substantially equal to the inside diameter of a pressing element 40, whereby when the partition plate is installed in a guide shaft 50, the outer peripheral surface is brought into contact with the inner surface of the pressing element 40. Thus, an adjusting chamber 91 is formed between the partition plate 90 and the pressing element 40. Accordingly, the adjusting chamber 91 is increased and decreased in its capacity according to sliding of the pressing element 40, so that a change of the total capacity of a cavity portion can be prevented.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention applies a constant tension to the engine drive gears or timing belts of two-wheeled automobiles, four-wheeled automobiles, and RJJ cars. The present invention relates to a propulsive force imparting device.

<Prior art> When the propulsion force imparting device 1 is used as a chain tension thinner or belt tensioner, for example, and the chain or belt becomes loose during use or becomes loose due to wear and stiffness, the chain or belt can be Although it maintains a constant tension by pressing in a certain direction, the pressing acts in a manner similar to that of a rigid body in response to a reaction force in the opposite direction.

Figure 4 shows a longitudinal sectional view of a conventional example of the force applying device, and Figure 5 shows a longitudinal sectional view of the device in its operating state.

This sui-L advancing force applying device consists of a horizontally long casing 1, a rotary body 2 and a pressing body 3 which are screwed into the casing 1, and a r-sing l so as to penetrate through these insides. The rotating body 2 is provided with a guide shaft 4 inserted into the rotating body 2, and a spring 5 that urges the rotating body 2 to rotate.

The tip of the pressing body 3 (the right end in FIG. 4) has an O
A cap 7 is fitted through the ring 6, and this cap 7 comes into contact with a chain, belt, etc.
L1- maintains a constant tension. When this contact occurs, the pressing body 3 moves 1-1 in the axial direction, but this sliding of the pressing body 3 is caused by the screwing of the pressing body 3 into the screw ai7.
The guiding shear throat 4 is provided to convert the rotational force of the rotating body 2 into the propulsive force of the pressing body 3. This guide shaft 4)1-
- Penetrates the song 1 t: The connecting body 8 is inserted into the proximal end and its own rotation is made into a mouth t, and the small diameter part 4a on the distal end side is formed with a non-circular cross section and penetrates into the pressing body 3. The rotation of the pressing body 3 is restrained 17 by the small diameter portion 4a, and the rotational force of the rotating body 2 is converted into the propulsive force of the pressing body 3.
.

The inside of such a propulsive force applying device is filled with a lubricant such as grease or engine oil to lubricate each member. The hollow part A in the longitudinal direction of the 'r-sing 1, the hollow part 13J3 between the rotating body 2 or the guide shaft 4 and the pressing body 3 and the guiding shirt 4, the pressing body 3,
A cavity C formed by the cap 7 is filled with lubricant, and the lubricant flows to lubricate each member.

<Problems to be Solved by the Invention> However, in the conventional propulsion force applying device, when the pressing body 3 slides forward from the Nori-renge 1,
As shown in FIG. 5, the total volume of the internal cavity increases. In other words, the hollow parts B and C are placed in the direction of the advancing part of the pressing body 3.
When the cavity A is enlarged, the tip of the cavity A also expands. When the volume of the cavity expands in this way, the inside becomes a negative pressure state, which impedes the smooth flow of the lubricant, resulting in a good d'' JJ sliding action cannot be obtained.Furthermore, the propulsive force of the pressing body 3 is weakened, resulting in the problem that the desired tension cannot be applied to the bell or chain.

The present invention (in consideration of the above-mentioned circumstances) provides a propulsion device having a structure in which the inside does not become negative pressure even when the pressing body advances.

Means for Solving Problems> The present invention provides an adjustment chamber whose volume changes between the partition plate and the partition plate by attaching a partition plate to the end of the guide shaft so as to be in contact with the inner surface of the press body. Wait until the change in the volume of the cavity part, which changes due to the sliding of the chamber, is offset by the increase or decrease in volume of the adjustment chamber, and the change in the total volume of the cavity part 11'4 is prevented by adjusting it to L. I'm 17 years old with Atsushi.

<Example> Hereinafter, an embodiment of the propulsion force imparting device according to the present invention will be described with reference to the vertical cross-sectional view 11n shown in FIG. 1, the vertical cross-sectional view J5 in the operating state shown in FIG. 2, and the line ■-■ shown in FIG. 3゜IT advancing force applying device of this embodiment, horizontally elongated casing 2, which will be specifically explained with reference to a sectional view.
0, the rotating body 30 and the pressing body 40 inserted into the Jl-thong 20 in a screwed state, and the tl, f, -guiding shear inserted into the Jl-thong 20 so as to be located inside these. y I-50, a spring 60 for rotationally biasing the rotating body 30, and a connecting body 70 inserted from the proximal end of the 1-thong 20 (the left tl part in FIG. 1). There is. The outer periphery of the cane and ge 20 is formed into a circular shape, making it a cicada.
Its tip (right end in FIG. 1) is open. Further, a support member (not shown) is attached to this distal end portion, and the first filter is attached to equipment such as an engine (not shown) via this support member. In addition, a flange (not shown) that is perpendicular to the axial direction is extended to the tip, and a hole is made in the 1st 7th flange (the 7th lamp is brought into contact with the outer wall of the device and fixed with bolts). 17 may be done 1, this installation is in good condition, then) r-song 2
The right end of 0 is located inside the device, and the left end is outside the machine. In addition, there is a 9 mark on the left end of the JR-Astragalus 20.
A threaded hole 25 into which the slot 24 in the mB direction and the seal port 1-80 for sealing the sleeve I/24 are screwed together.
and are formed.

The rotating body 30 and the pressing body 40 are inserted into the 11-thong 20 in a screwed state. The rotating body 30 is inserted so as to be located on the left side of the pressing body 40, and its left end outer circumferential direction is fitted into the 1-thong 20 and pivotally supported. This rotating body 30 is formed into a cylindrical shape (in).
is extended, and the abutment 7 flange 31 contacts the inner side of the )1-sing 20. In addition, the rotation is performed stably. In addition, a male threaded portion 32 is formed in the longitudinal direction on the outer circumferential surface of the right side of the abutment flange 31, and a lugs (
Seven parts 41 are screwed together. The pressing body 40 is a cylindrical body with a partition wall 42 formed approximately in the center so that the vertical cross-sectional shape is approximately r-1 shape, and a cap 81 made of an elastic material is fitted to the right end of the cylinder. ], this cap 81 comes into contact with a belt, chain, etc. inside the device 17, presses the belt, chain, etc., and maintains a constant tension. 1. In this case, a through hole 82 in the axial direction is formed in the cap 81. As shown in FIG. 3, a rectangular guide hole 43 is formed in the gap g42 of the pressing body 40, and the outer peripheral surface of the pressing body 40 is formed into a circular shape.

The guide shear y I-50 is inserted into the interior of the rotating body 30 and the pressing body 40 screwed together in this way, and its left end is formed on the left end surface of the cavity 21 of the 11-nong 20. It is inserted into the support hole 26 and pivotally supported by the Nori-renge 20. The right side portion of this guide gloss 71-50 has a guy 1 portion 51 that is formed 8 times thinner than the left side portion, and this guy 1 portion 51 passes through the guide hole 43 of the pressing body 40. There is. In this case, the guide part 5111
As shown in FIG. 3, it is formed into a rectangular shape and penetrates into a guide hole 43 of the same shape, thereby restraining the pressing body 40 from relative rotation and suppressing the rotational force of the rotating body 30. This is converted into a propulsive force in the axial direction of the body 40.

Furthermore, when the pressing body 40 moves in the axial direction, the guy 1 portion 51 functions as a guide to ensure stable movement in the same direction. A receiving groove 52 in the axial direction is formed on the 45th edge, but this is done once when tightening the spring 60 as will be described later.

The spring 60 t, t, which rotates the rotating body 30, is a torsion spring Lt in this embodiment, and its coil portion 61 is inserted onto the rotating body 30, and one end 62 is folded back to form the second part of the casing 20. Formed t: horizontally long rJl groove 27
The other end 63 is in contact with the rotating body 3° 7 run 3
1 is passed.

The I'+iJ connecting body 70 consists of a flat plate, and has 11-
Thin))' 24
Attach it to the landing guide so that it is inserted completely and reaches the left end surface of the guide shafts 71 and 50. By attaching this connecting body 7°, the guide shafts 71 and 50 can be rotated in a straight forward manner. Therefore, the guide shaft 5o penetrates the t-pressing body 4 so that the relative rotation with the guide shafts 71 and 50 is restricted.
0 also operates in such a way that rotation is the first and only axial sliding occurs.

In FIG. 1, 84 is a lock bin inserted from the outside of the R-thong 2o in a direction intersecting the axial direction 1a, and its tip is formed on the rotating body 30 and inserted into the T-notch 33. , the rotation of the rotating body 30 is locked. 6, 85 is a sealing stopper made of an elastic body, 1J
Pull out the recycle bin 84 and unroll the two parts.Furthermore, 83 is made at the tip of the no-runge 20.Tlt, 2nd layer +l, g Insert into 213-1 1st part The C-L liner is in close contact with the outer peripheral surface of the pressing body 4o to prevent dust and the like from entering the device.

In this embodiment, the guide shafts 71 and 50
A partition plate 90 is attached to the tip of the holder. The partition plate 9o is attached by forming a stepped portion at the tip of the guide portion 51 of the guide yarn 71-50, and fitting the partition plate 90 into the TF4F portion 51 so as to abut the stepped portion. . This partition plate 90 is formed so that its outer diameter is approximately the same as the inner diameter of the pressing body 40, and when attached to the guide shaft 50, the outer peripheral surface comes into contact with the inner surface of the pressing body 40. ing. As a result, an adjustment chamber 91 is formed between the (-I cutting plate 90 and the pressing body 40).
Its volume increases or decreases depending on J+.

In the initial state of operation shown in FIG. 1, the volume of the adjustment chamber 91 is large. In Figure 2,
When the partition wall 42 of the pressing body approaches the partition plate 90, the volume of the adjustment chamber 91 decreases. Although the volume is reduced by 11'l, the adjustment is made so that the sum of the volume of the chamber 91 and the volume inside the casing 20 remains constant. Press the LE body 40 as shown in Figure 2.
11 - The volume of the hollow part A in the longitudinal direction of the ring 20, L, and the rotating body 30 or the guide shafts '71 and 50.
Although the volume of the hollow part B between the press body 40 and the press body 40 gradually increases, the volume of the adjustment chamber 91 gradually decreases to offset these increases, so that there is no change in volume as a whole. As a result, even if the pressing body 40 advances, the internal pressure does not become negative, and a reliable propulsion force can be obtained.In addition, the lubricant in the part where the volume decreases is used in the part where the volume increases. The lubricant flows smoothly between each member,
The lubrication effect is improved and wear of the members can be effectively suppressed. Note that 92 is the outer circumference 1f of the partition plate 90.
This is an O ring fitted into the yi, and prevents the leakage of ds'l slip from the adjustment chamber 91 and the intrusion of dust from inside the equipment.

Next, the assembly of such a propulsion device will be explained. First, after inserting the guide shafts 71 to 50 into the casing 20, the spring 60 is inserted into the rotating body 30, the pressing body 40 is screwed onto the rotating body 30, and the guide shafts 71 to 50 are inserted from the open right end of the casing 20. .

During this insertion, the cavities A, B and the adjustment chamber 91 are filled with lubricant, and then the seal ring 83 is fitted into the circumferential groove 28 of the casing 20. First, insert a tool such as a screwdriver into the receiving groove 52 on the right end surface of the guide shafts 71-50 to remove the guide shafts 71-50.
Rotate. Due to this rotation, the guide shaft 50 penetrates t: so that the pressing body 40 is pulled into the casing 20 while rotating in the same direction fi! J movement, pressing body 40
The left Q portion of the rotating body 30 comes into contact with the contact 7 flange 31 and stops LF. In this state, when the guide shaft 50 is further rotated, the rotating body 30 screwed into the pressing body 40 rotates dependently, the torsion spring 60 is tightened, and energy for rotating the rotating body 30 is stored. 1) After that, the connector 7
0 to lock the rotation of the guide shaft 50,
While screwing together the seal bolt 80, the lock pin 84
is inserted to lock the rotation of the rotating body 30, and then the cap 81 is fitted onto the right end of the pressing body 40. The assembly is completed as described above, so when the lock pin 84 is handled after being attached to the outer wall of the device, the rotating body 30 rotates due to the force of the torsion spring 60, and the pressing body 40 advances and moves forward.
-7″81 suppresses 1,000L-no or belt etc. 3
Note that various modifications can be made to the present invention. Guide gloss 7
The guide portion of 1. and the guide hole of the pressing body may have an irregular cross section other than circular, and are not limited to a rectangular shape. Alternatively, instead of a torsion spring, use a 9-wrap spring (7 coils are also acceptable).

<Effects of the Invention> As described above, according to the present invention, a partition plate is attached to the guide gloss 71- to form an adjustment chamber between it and the pressing body. Since the volume is kept constant by canceling out changes, it prevents negative pressure inside and provides reliable propulsion.In addition, the lubricant flows well, so it is smooth. It is effective because it has a lubricating effect.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view of its operation, FIG. A vertical cross-sectional view of the device, and FIG. 5 is a vertical cross-sectional view of its operation. 20]] r-ring 30 rotating body, 40 pressing body, 50 guide shaft,

Claims (1)

[Scope of Claims] A rotating body inserted into a casing and urged to rotate by a spring force, and a pressing body inserted into the casing in a screwed state with the rotating body and sliding in the axial direction by the rotation of the rotating body. , a guide shaft that is inserted between the rotating body and the pressing body in a locked rotation state to restrain the rotation of the pressing body and guide the sliding in the axial direction; and a guide shaft that is attached to the end of the guide shaft and whose outer peripheral surface is pressed. What is claimed is: 1. A propulsive force imparting device comprising: a partition plate inscribed in a body; and an adjustment chamber whose volume increases or decreases due to sliding of the press body is formed between the partition plate and the press body.