JPH0131776Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a flexible shaft that connects, for example, a vehicle drive source and a speedometer and transmits the rotational force of the drive source to the speedometer. This invention relates to a lubricating oil leak prevention device for a flexible shaft that can prevent lubricating oil from flowing into the speedometer side.

[Background of the idea]

Regarding this type of lubricant oil leakage prevention device, for example, the inventor of the present invention has already developed and proposed it.
-There is No. 14571. This is because, as shown in FIG. 5, lubricating oil, ie, grease 38 is filled between the inner shaft 36 of the flexible shaft 31 and the outer tube 35. Reference numeral 37 denotes a connecting fitting fixed to one end of the outer tube 35, and the connecting fitting 37 is connected to the stem portion 34 of the speedometer 32 via a cap nut 33. Also, when connecting the connecting fitting 37 and the stem portion 34, the inner shaft 36
The tip thereof is connected to the rotating shaft 39 of the speedometer 32 so that rotational force can be transmitted thereto. 40 is the rotation axis 3
The oil seal 40 is fitted between the outer peripheral surface of the flexible shaft 31 and the inner peripheral surface of the connecting fitting 37. 32 to prevent it from flowing into the interior. Reference numeral 41 denotes a retaining bush that is tightly fitted onto the outer peripheral surface of the rotating shaft 39. However, in the lubricating oil leakage prevention device of the prior application, there is a gap between the inner circumferential surface of the connecting fitting 37 and the outer circumferential surface of the stem portion 34 of the speedometer 32 into which this connecting fitting 37 is fitted. Because of this, when the speedometer 32 and the flexible shaft 31 are connected, the oil seal 4
0 and the center line of the rotating shaft 39 may not match, and in such a case, the oil seal 4
There was a problem in that the grease was pushed eccentrically, making it impossible to effectively prevent grease from rising.

[Purpose of invention]

The present invention was developed by focusing on these conventional problems, and even if the center lines of the oil seal and the rotating shaft do not match, the entire side of the oil seal is aligned with the side of the seal member on the speedometer side. It is an object of the present invention to provide a lubricating oil wicking prevention device that can effectively prevent grease wicking by being able to come into elastic contact with the lubricant.

[Example of idea]

The present invention will be explained in detail below based on embodiments shown in the drawings.

1 and 2, 1 is a speedometer, and an annular groove 3 is formed on the outer peripheral surface of a stem portion 2 of this speedometer 1, and a bush 4 is formed inside the stem portion 2. A rotating shaft 5 is pivotally supported through the rotating shaft 5, and a center hole 6 having a square cross section is formed inside the rotating shaft 5. Reference numeral 7 denotes a deflection shaft, and the tip of an inner shaft 9 rotatably housed in an outer tube 8 of the deflection shaft 7 is formed into an angled portion 10 having a rectangular cross section. By fitting this angled portion 10 into the center hole 6, the rotation of the inner shaft 9 is transmitted to the rotating shaft 5. A brass bushing 11 is tightly fitted onto the outer periphery of the tip of the rotating shaft 5, and the bushing 11 and the stem portion 2
An oil seal 12 is press-fitted into the gap between the two. This oil seal 12 includes an elastic ring 13 made of an elastic body such as rubber, and an elastic ring 13 made of an elastic material such as rubber.
An annular lip portion 15 provided on this elastic ring 13 is in sliding contact with the outer peripheral surface of the bush 11, and lubricating oil is supplied into the stem portion 2. It is constructed in such a way that it cannot be penetrated. 16 is a washer interposed between the end surface of the bush 11 and the end surface of the bush 4. Reference numeral 17 denotes a resin connector fitted to the outside of the end of the outer tube 8, and this connector 17 includes:
An arm 18 having an engaging claw 19 at its tip is provided. Reference numeral 20 denotes a fitting step portion of a seal member provided inside the connector 17, and this fitting step portion 20
An annular elastic ring member 21 made of a flexible elastic material such as rubber is fitted into the ring. This elastic ring material 21 has concentric annular protrusions 22 formed on both end faces thereof, and an annular groove 23 formed on the circumferential surface of the ring material 21.

The structure of this embodiment has been described above. Next, the operation will be described. In the connector 17 of the above structure,
When the stem portion 2 of the speedometer 1 is fitted, the connector 17
The engaging claw 19 of the arm 18 provided in the arm 18 enters the annular groove 3 of the stem portion 2, and as a result, the connection between the stem portion 2 and the connector 17 is maintained, and the inner shaft 9 and the speedometer 1 are The rotating shaft 5 is maintained in a connected state through the square center hole 6 and the angular part 10. When the stem portion 2 and the connector 17 are fitted together, one protrusion 22 of the elastic ring material 21 fitted to the step 20 of the connector 17 is connected to the step 20 of the connector 17. The other protrusion 22 is in contact with the side end surface of the oil seal 12 attached to the stem part 2. That is, the elastic ring material 21 is in contact with the step part 2 of the connector 17.
Since the grease 2 in the flexible shaft 7 is elastically sandwiched between the elastic ring material 21 and the oil seal 12, the ridges 22 provided on both sides of the elastic ring material 21
4 is prevented from flowing into the speedometer 1.
As described above, according to this embodiment, since the grease rising inside the flexible shaft is prevented on both sides of the elastic ring material 21, the center of the elastic ring material 21 and the center line of the rotating shaft 5 are Even if there is a mismatch,
Grease build-up can be effectively prevented.

FIGS. 3 and 4 show another embodiment of this invention. In this embodiment, except for the elastic seal, the parts are the same as those in FIGS. The explanation will be omitted. In this elastic ring material 21, the outer diameter of the lip portion 25 on the stem portion side defined by the annular groove 23 is made small so as not to come into contact with the inner diameter surface of the connector 17. Therefore, this elastic ring material 2
According to No. 1, the lip portion 25 is not brought into contact with the inner circumferential surface of the connector 17, so it is relatively easily bent, and as a result, the stem portion 2 of the speedometer is connected to the connector 1.
The elastic ring material 21 has the effect of weakening the elastic pressure resistance when it is fitted into the stem 7, thereby making it possible to easily and reliably fit the stem 2 and the connector 17 completely.

[Summary of the idea]

As described above, in the present invention, a flexible inner shaft 9 is rotatably inserted into the outer tube 8, and the end portion of the outer tube 8 is connected to the stem of the speedometer 1. A connecting tool 17 to be connected to the section 2 is fixed, and an elastic ring 21 made entirely of an elastic material and having an annular groove 23 on the circumferential surface and annular protrusions 22 on both sides is inserted into the connecting tool 17. The oil seal 12 is mounted on the stem portion 2, and the annular lip 15 of the oil seal 12 is attached to the circumferential surface of the rotating shaft 5, which is pivotally supported by the stem portion 2, and which is connected to the inner shaft 9 and rotates by its rotation. When the connector 17 is attached to the stem portion 2 so as to be in sliding contact with each other, the oil seal 12 and the connector 17 are in contact with the protrusion 22 and sandwich the elastic ring material 21. This is a device for preventing lubricating oil from rising on a flexible shaft.

[Effect of idea]

Therefore, according to this device, since both side surfaces of the annularly formed elastic ring material 21 are held between the connector 17 and the stem portion 2, even if the center of the elastic ring material 21 Even if the center line of the rotary shaft 5 located in the stem portion 2 does not match, the feature is that grease buildup can be effectively prevented.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an embodiment of the flexible shaft lubricating oil leak prevention device according to the present invention, Fig. 2 is a cross-sectional view showing the state of its connection, and Fig. 3 is a cross-sectional view showing another embodiment of the present invention. 4 is a sectional view showing the state of the coupling action, and FIG. 5 is a sectional view of a conventional example. DESCRIPTION OF SYMBOLS 1... Speedometer, 2... Stem part, 3... Annular groove, 4... Bush, 5... Rotating shaft, 6... Center hole, 7... Deflection axis, 8... Outer tube, 9... Inner shaft, 10...Corner part, 11...Button, 12
...Oil seal, 13...Elastic seal, 14...
...Hard ring, 15...Rip portion, 16...Washer, 17...Connector, 18...Arm, 19...
...Engaging claw, 20... Fitting step, 21... Elastic ring material, 22... Projection, 23... Annular groove, 24...
Grease, 25... lip part.

Claims (1)

[Scope of utility model registration request] A connector 17 that connects the end of the flexible shaft 7 to the stem portion 2 of the speedometer 1 at the end of the outer tube 8 of the flexible shaft 7 into which the inner shaft 9 having flexibility is rotatably inserted. The elastic ring 21, which is entirely made of an elastic material and has an annular groove 23 on its circumferential surface and annular protrusions 22 on both sides, is attached to the connector 1.
7, and an oil seal 1 is attached to the stem portion 2.
2 is attached so that its annular lip 15 is pivotally supported by the stem portion 2 and slides on the circumferential surface of the rotating shaft 5 which is connected to the inner shaft 9 and rotates by the rotation of the inner shaft 9, and the connecting tool 17 When connected to the stem portion 2, the oil seal 12 and the connecting tool 17
A lubricating oil leak prevention device for a flexible shaft, characterized in that the elastic ring member 21 is held between the elastic ring member 21 while contacting the protrusion 22.