JPH0237500B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a lubricating oil supply structure for an automatic transmission, and more particularly, to a lubricating oil supply structure for an automatic transmission, and more specifically, for supplying lubricating oil to a speedometer gear mounted on an output shaft of an automobile transmission. It relates to a structure that supplies

[Prior Art] An automobile transmission has a speedometer gear on its output shaft, and lubricating oil is supplied to the meshing portion of the speedometer gear from an oil hole provided in the output shaft. . In the lubricating oil supply device shown in Japanese Utility Model Application Publication No. 55-173745, the oil hole is located along the axial direction of the center of the output shaft at the axial position where the speedometer gear is mounted, or at the axial position thereof. The lubricating oil supplied to the oil hole extends in the radial direction as a vertical hole, and then extends in the radial direction as a horizontal hole to the outer peripheral surface of the output shaft near the location where the speedometer gear is disposed. The oil immediately flows out from the horizontal hole through the vertical hole toward the location where the speedometer gear is disposed, and lubricates the meshing portion of the speedometer gear.

Japanese Utility Model Application Publication No. 53-53272 discloses that the end of the portion of the shaft having a vertical hole and a horizontal hole as described above, where the horizontal hole is provided, extends along one chord along a part of its circumferential surface. A notch is formed in the axial direction, and a cylindrical sleeve is attached around the notch to form a space along the axial direction between the inner surface of the sleeve and the notch, and the space is supplied through the vertical hole and the horizontal hole. The lubricating oil is further routed axially along the shaft through the passage and toward a bearing located adjacent the open end thereof.

[Problems to be Solved by the Invention] If the axial mounting position of the speedometer gear is axially far away from the lubricating oil supply end of the vertical hole, the axial length of the vertical hole becomes long;
As a result, the drilling length of the vertical hole becomes longer, leading to an increase in processing time, a reduction in the life of the drilling tool, and a reduction in processing accuracy. In particular, in addition to the speedometer gear, if a vehicle speed detection member such as a magnetic rotor is installed on the lubricating oil supply end side of the output shaft, the speedometer gear will be located on the output shaft accordingly. The vertical hole is further away from the lubricating oil supply end, and the length of the vertical hole in the axial direction becomes even longer.

In addition, in a structure in which a part of the outer surface of the shaft is cut out to extend a part of the passage for supplying lubricating oil, as in the above-mentioned Japanese Utility Model Publication No. 53-53272, the strength of the shaft or Due to the balance of rotating mass,
If it is not desirable to provide such a notch, it may not be possible.

The present invention addresses the above-mentioned problems and provides a lubricating oil supply passage for the speedometer gear without providing a notch in the output shaft, avoiding an increase in the length of the vertical hole. The object of the present invention is to provide a lubricating oil supply structure for the speedometer gear of an automatic transmission.

[Means for Solving the Problems] According to the present invention, this problem is solved by the above-mentioned speed control in an automatic transmission in which a vehicle speed detection member and a speedometer gear are mounted adjacent to each other in the axial direction on an output shaft. The lubricating oil supply structure for the meter gear includes a vertical hole extending in the axial direction within the output shaft, a horizontal hole extending from the terminal end of the vertical hole to the outer peripheral surface of the output shaft, and a horizontal hole for detecting the vehicle speed. A lubricating oil supply passage is formed in the inner surface of the hub portion adjacent to the speedometer gear of the member along the axial direction so as to provide mass balance to the key guide groove for locking the key in the hub portion. This is achieved by a lubricating oil supply structure characterized in that it is formed.

[Operations and Effects of the Invention] As described above, in the automatic transmission in which the vehicle speed detection member and the speedometer gear are mounted adjacent to each other in the axial direction on the output shaft, the speedometer gear of the vehicle speed detection member is When a key guide groove for locking a key is formed in an adjacent hub part, it is preferable that the hub part is provided with a mass reducing part that provides mass balance. The vertical hole is formed as a groove extending in the axial direction along the inner surface of the output shaft, and this groove is used to form a lubricating oil passage that continues to the vertical hole and the horizontal hole formed in the output shaft. By shortening the length accordingly, an oil supply passage for supplying lubricating oil to the speedometer gear can be secured.

[Example] The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional view showing, in particular, an extension housing portion of a vehicle transmission in which a lubricating oil supply structure according to the present invention is implemented, and FIGS. 2 and 3 are cross sections taken along lines - and - in FIG. 1. It is a diagram.

In the figure, reference numeral 1 indicates an extension housing that is generally attached to the rear of a gear case of a transmission, and an output shaft 2 of the transmission extends through the center of the extension housing. The output shaft 2 is rotatably supported by the extension housing 1 via a bearing bush 4 by a propeller shaft sleeve yoke 3 spline-coupled to its rear end. Further, an oil seal member 5 is attached to the rear end of the extension housing 1 to provide a fluid-tight seal between the extension housing 1 and the output shaft 2.

On the outer periphery of the output shaft 2 located inside the extension housing 1, a rotor (magnetic rotor) 6 for vehicle speed detection and a speedometer drive gear 7 are adjacent to each other in the axial direction by two snap springs 8a and 8b. is installed. Rotor 6
is prevented from rotating relative to the output shaft 2 by a half-moon key 10 engaged in its keyway 9, and the drive gear 7
is prevented from rotating relative to the output shaft 2 by a ball key 12 engaged in a keyway 11 thereof.

A magnet 13 is attached to the rotor 6, and a reed switch 14 is attached to the extension housing 1 adjacent to the rotor 6. It is designed to open and close repeatedly as the target approaches. The rotational speed of the output shaft 2 is detected from the opening/closing period of the reed switch 14.

A worm gear 15 meshes with the speedometer drive gear 7, as best shown in FIG. The worm gear 15 has its shaft portion 16 rotatably supported by the extension housing 1 through a sleeve-shaped bearing member 17, and is rotationally driven by a drive gear 7 that rotates together with the output shaft 2, so that the vehicle speed is determined by the rotation speed of the worm gear 15. It is now being detected.

In the output shaft 2, an oil hole for supplying lubricating oil is drilled in the center thereof as a blind vertical hole 18 extending in the axial direction from the end surface (not shown) on the left side in the figure by drilling or the like. There is. This vertical hole 18 communicates with a lubricating oil supply port 19 provided on the output shaft 2 at the left end in the figure, and extends from this part to the axial position where the rotor 6 is mounted. There is. That is, the vertical hole 18 extends in the axial direction of the output shaft 2 and terminates at the position where the rotor 6 is disposed. Vertical hole 1
A diaphragm element 21 is provided near the left end of the diaphragm 8 . Further, the output shaft 2 has a horizontal hole 2 which extends in the radial direction from the end of the vertical hole 18 to the outer peripheral surface of the output shaft 2.
It has 0.

The rotor 6 has a hub portion 6a, and the inner peripheral portion of the hub portion 6a has a key guide hole 22 extending in the axial direction, and a key guide hole 22 located symmetrically with respect to the key guide hole 22 and having the same shape as the key guide groove 22. A groove (hollow portion) 23 is formed. The groove 23 is necessary to obtain rotational balance of the rotor 6, and the groove 23 and the key guide groove 22 are formed when the rotor 6 is cast. Groove 23
is connected to the horizontal hole 20 at one end, opens to one side of the drive gear 7 at the other end, and connects to the teeth of the drive gear 7 through a notch 24 provided at the end of the hub portion 6a. It's summery. Thus, the groove 23 defines a lubricating oil passage extending in the axial direction of the output shaft 2 between the groove 23 and the outer peripheral surface of the output shaft 2 .

The lubricating oil supplied to the lubricating oil supply port 19 is
It flows into the vertical hole 18 while its flow rate is adjusted by the throttle element 21, and after passing through the vertical hole, after passing through the horizontal hole 20, it flows in the groove 23, and from there it flows into the notch 24.
The lubricant flows out toward the teeth of the drive gear 7 and lubricates the meshing part between the drive gear 7 and the worm gear 15.

As described above, a lubricating oil passage extending along the axial direction of the output shaft 2 is constituted by the groove 23 for mass balance with respect to the key guide groove 22 provided in the hub portion 6a for keying the rotor 6. By doing so, the length in the axial direction of the vertical hole 18 bored in the output shaft 2 is shortened, thereby improving the workability of the vertical hole 18.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited thereto, and various embodiments are possible within the scope of the present invention. It will be clear to those skilled in the art.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an extension housing portion of a vehicle transmission incorporating a lubricating oil supply structure according to the present invention, and FIGS. 2 and 3 are sectional views taken along lines - and - in FIG. 1. Out. 1... Extension housing, 2... Output shaft, 3... Propeller shaft sleeve yoke,
4...Bearing bush, 5...Oil seal member,
6...Rotor, 7...Speedometer drive gear, 8a, 8b...Snat spring, 9...Keyway, 10...Half-moon key, 11...Keyway, 12...
...Ball key, 13...Magnet, 14...Reed switch, 15...Worm gear, 16...
Shaft portion, 17...Bearing member, 18...Vertical hole, 19...
... Lubricating oil supply port, 20 ... Horizontal hole, 21 ... Throttle element, 22 ... Key guide groove, 23 ... Groove, 24
...Notch, 25...Oil gutter.

Claims (1)

[Claims] 1. A lubricating oil supply structure for the speedometer gear in an automatic transmission in which a vehicle speed detection member and a speedometer gear are mounted adjacent to each other in the axial direction on the output shaft, and the inside of the output shaft is moved in the axial direction. an extending vertical hole; a horizontal hole extending from the terminal end of the vertical hole to the outer circumferential surface of the output shaft; and an inner surface of the hub portion of the vehicle speed detection member adjacent to the speedometer gear. A lubricating oil supply structure characterized in that a lubricating oil supply passage is formed by connecting with a groove formed along an axial direction so as to provide mass balance to a key guide groove for locking a key.