JPS5924315A - Fitting structure of governor valve shaft - Google Patents

Abstract

PURPOSE:To prevent the wear of a governor valve shaft against a stopper pin even while the shaft is revolving, by fitting a stopper pin piercing through from the outside of a housing into a groove having U-shaped section formed toward the circumference of the shaft. CONSTITUTION:A stopper pin 16 pierces through into a circular groove 9a formed toward the circumference of a governor valve shaft from the outside of a mission housing 1. The pin 16 is formed into a square form having a plane part 16a which touches the governor valve shaft. The bearing parts across the shaft are formed into columnar parts 16d and 16c; while the groove 9a formed to the shaft has a U-shaped section to have a contact with the part 16a of the pin 16. The parts 16b and 16c can have a certain amount of revolutions to the pin 16 in order to have an effective planar contact.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mounting structure suitable for rotatably engaging a governor pulp shaft with a transmission housing in a motor vehicle equipped with an automatic transmission.

Typically, a car equipped with a complete automatic transmission includes a torque converter based on the fluid coupling principle, a planetary gear system that increases/decelerates, neutralizes, and reverses rotational input, and a hydraulic control system based on a hydraulic circuit. is a component of the vehicle, but in addition to incorporating a gapana into the hydraulic control system to operate the shift pulp, it is also possible to accurately control the vehicle speed using the hydraulic link control system.
A configuration that communicates to the system is common. That is, as shown in the partial sectional view including the governor of the automatic transmission shown in FIG. a sun gear 3 constituting a low and reverse planetary unit formed adjacent to the sun gear 3; a pinion gear 4 meshing with the sun gear 3; and a pinion gear 5 meshing with the pinion gear.
A transmission mechanism is constructed via a parking gear 6 and a one-way clutch 7 attached to the unit, and a governor pulp shaft 9 is provided which meshes with a worm 8 provided outside the ring gear 5. As shown in the exploded perspective view of FIG. 2, the upper part of the governor pulp shaft 9 has a primary Kahana valve lO and a secondary governor valve 11 firmly attached to it, and is covered with 13 governor caps via a seal ring 12. 14 indicates a snap ring. A circumferential groove 9a is formed in the governor pulp shaft 9, and a stopper pin 15 is inserted from the outside so as to engage in the groove 9a to prevent the governor pulp shaft 9 from being pulled out in the axial direction. He's functionally rich. FIG. 3 shows a partially assembled state of the governor and is a partial sectional view taken along the line 1ll-1 in FIG. It is attached. That is, in the same figure, a worm 8 provided on the outside of the ring gear 5 and a self-closing nion 20 are connected to each other.
It is connected to the governor pulp shaft 9 and converts the rotation of the ring gear 5 into the rotation of the governor pulp shaft 9. The two governor valves rotate in response to the rotational force of the governor pulp shaft 90, and while controlling the governor pressure based on the action of centrifugal force, obtaining hydraulic pressure according to the vehicle speed and operating the shift valve by the hydraulic pressure; Controlling vehicle speed is a well-known principle. In the above configuration, the stopper bin 15 normally holds a cylindrical bottle portion 15a, so that the cylindrical pin-containing portion 15a is inserted into the circumferential groove 9a formed in the governor pulp shaft 9. When engaged, the parts that come into contact with the opposing planes in the groove form a line contact, so when the governor pulp shaft 9 contacts the stopper pin 15 during rotation, the wear is severe at the line contact part between the two. However, there is a problem in that the stopper pin 15 may be broken due to wear during long-term use. That is, the stopper pin I5 is connected to the cylindrical bottle portion 15.
Since a contacts the governor pulp shaft 9 within the circumferential groove 9a, the local surface pressure at the contact portion i becomes extremely high, which tends to promote the aforementioned wear phenomenon.

The present invention improves the shortcomings of the structure of the conventional stopper bin for retaining governor pulp as described above, and reduces the blood pressure at the contact part with the stopper pin even when the governor pulp shaft is rotating, thereby suppressing the above-mentioned wear phenomenon. The objective is to provide a structure that prevents this from occurring, and in order to achieve this objective, a mission nozzle is installed in a circumferential groove formed in the circumferential direction of the shaft with a U-shaped cross section. In a mounting structure that restricts the axial movement of the valve shaft by engaging a stopper pin inserted from the outside, the stopper pin is inserted into the opposing planes in the circumferential groove formed in the U-shaped cross section. The contact portion of the stopper pin is formed into a planar shape, and the bearing portions located toward both ends of the stopper pin are formed into a cylindrical shape, and the cylindrical bearing portion is rotatably mounted on the transmission housing. This structure increases the contact area at the contact area between the stopper pin and the governor pulp shaft, thereby reducing the surface pressure between them, extremely minimizing wear phenomena, and extending the life of the device. and high reliability can be obtained.

The mounting structure of the governor pulp shaft according to the present invention will be explained below with reference to FIGS. 4 to 8.

FIG. 4 is a plan sectional view showing a structure in which the cyst collar pin 16 is pushed through the circumferential groove 9a formed in the circumferential direction of the governor pulp shaft 9 from the outside of the mission housing 1. As shown in the enlarged plan view shown in FIG. 5 and the perspective view shown in FIG. The bearing portions are formed as cylindrical portions 16b and 16c. Sho 17,
17 indicates a pressure oil flow port, and 18 indicates a stopper pitch 160.
For assembly, bolt heads are shown. On the other hand, the circumferential groove 9a formed on the governor valve 9 side has a U-shaped cross section as shown in FIG. Flat portion 16 of stopper pin 16
cylindrical portions 161), 16
0 is inserted and supported on the mission housing 1 side,
Since the structure allows a certain degree of rotation with respect to the stopper bin 16, the governor pulp shaft 9 and the stopper bin 16 are configured to be able to make effective surface contact.

The present invention is based on the above-mentioned governor pulp shaft)? Regarding the mounting structure for rotatably supporting the transmission housing, the operation thereof will be fully explained below. The rotational force of the ring gear 5 located at the outermost side of the planetary gear unit configured inside the mission housing 1 is the worm 8.
, the rotational force of the governor pulp shaft 9 is converted through the pinion 20, and the governor pulp rotates. On the other hand, the stopper pin 16 is inserted from the outside of the transmission housing 1 into a circumferential groove 9a formed in the nano-lube shaft 9 and having a U-shaped cross section. 16a are positioned so as to abut on opposing planes within the circumferential groove 9a, and further, cylindrical portions 16b and 15a forming bearing portions located toward both ends of the stopper pin 16 are arranged. Since it is supported at one end of the mission housing 1 and is mounted to allow a certain degree of rotation of the stopper pin 16, when the governor pulp shaft 9 rotates, the circumferential shape @
9a and the flat portion 16a of the stopper pin 16 maintain surface contact at all times. For example, when the governor pulp shaft 9 is burnt into the stopper bin 16 during shipbuilding, and the load l shown by the arrow 0 in FIG. l is arrow C'
It is absorbed by feedback, and functions to maintain surface contact at all times. It goes without saying that lubricating oil always flows in the surface contact portion and acts to reduce frictional resistance. Therefore, in the above operation, the surface pressure between the stopper pin 16 and the governor pulp shaft 9 decreases, so that there is almost no wear on the contacting parts, which is extremely low compared to the wear based on conventional line contact. Amount of wear can be reduced. Therefore, even when used for a long period of time, there is almost no risk of breakage of the stopper pin due to the wear, and reliability is improved.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view including the governor in a normal automatic transmission, Fig. 2 is an exploded perspective view of the governor, and Fig. 3
The figure is a partial sectional view taken along the line l1l-1 in Fig. 1 with the governor assembled, Fig. 4 is a plan sectional view of the governor assembly to which the stopper pin according to the present invention is applied, and Fig. 5 is the stopper pin. FIG. 6 is a perspective view of the same part, FIG. 7 is a vertical cross-sectional view showing the relationship between the governor pulp shaft and the stopper pin, and FIG. 8 is an enlarged plan view of FIG. It is an enlarged view of the part. DESCRIPTION OF SYMBOLS 1...Mission housing, 9...Governor pulp shaft, 9a...Circumferential groove, 16...Stopper pi/, 16a...Plane part (contact part), 16b, 1(i
c...Cylindrical part (bearing part). Fig. 1 11λ-r Fig. 3 3

Claims (1)

[Claims] (1) A circumference formed in a U-shaped cross section in the circumferential direction of the governor pulp shaft in order to rotatably support the transmission housing for the governor valve shaft that rotates while supporting the governor valve installed in the automatic transmission. In the mounting structure in which a stopper pin pushed through from the outside of the mission housing is engaged in the shaped groove to restrict the movement of the governor pulp shaft in the axial direction, the circumferential groove is formed with a U-shaped cross section. The contact portions of the stopper pin that come into contact with the opposing planes of the stopper pin are formed into a flat shape, and the bearing portions located toward both ends of the stopper pin are formed into a cylindrical shape, so that the entire cylindrical bearing portion is rotated by the mission 7 housing. The mounting structure of the governor pulp shaft is characterized by the fact that it can be installed freely.