JPS5939233Y2 - Governor drive device in automatic transmission for vehicles - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a governor drive device in an automatic transmission for a vehicle.

In an automatic transmission device in which a governor is provided at a position intersecting the rotating shaft, conventionally, as shown in FIG. 1, the rotating shaft 1
A governor drive gear 2, which is a screw gear, is fixed to the key 3 by a key 3, and a driven gear 4 (fixed to the governor shaft) that meshes with the governor drive gear 2 is driven.

In this way, when a screw gear is used as the gear to drive the governor, the meshing is done by point contact, so when starting,
Rotational fluctuations that occur during gear changes or when driving on rough roads and the inertial force of the governor act as resistance, and excessive surface pressure is applied to the tooth surfaces of the screw gear, impairing its durability.

In order to improve this, if the screw gear is made of synthetic resin such as nylon to reduce the surface pressure, when large rotational fluctuations occur, the inertia force acts as resistance and damages the tooth surface. do.

In addition, deterioration of characteristics due to temperature changes and changes over time may cause damage to tooth surfaces and decrease in durability.

The present invention is intended to address the above-mentioned conventional problems, and will be described below with reference to the embodiment shown in FIG.

In the present invention, when attaching the governor drive gear 2 to the rotating shaft 1, the key 3 is not used as in the conventional case, but the governor drive gear 2 is fitted onto the rotating shaft 1 so as to be rotatable.

A friction piece 5 is interposed between one end surface 2a of the drive gear 2 and the flange surface 1a of the rotating shaft 1 facing thereto.

The friction piece 5 may be fixed to the flange surface 1a side or may be fixed to the one end surface 2a side of the drive gear 2.

Also, it does not need to be fixed.

Alternatively, separate friction pieces may be provided on both sides of 1a and 2a, or the two friction pieces may be brought into contact with each other.

An elastic member 6 such as a spring or a piece of rubber is interposed between the other end surface 2b of the drive gear 2 and the fixing ring 1b fixed to the rotating shaft 1 to press the drive gear 2 toward the flange surface 1a with an appropriate spring force. The drive gear 2 is always pressed against the flange surface 1a of the rotating shaft 1 via the friction piece 5 with a predetermined pressing force.

Note that the friction piece 5 may be made of a material that is somewhat elastically deformable.

In the above configuration, during normal rotation, the rotating shaft 1 and the drive gear 2 rotate together due to the frictional resistance of the friction piece 5, thereby rotationally driving the driven gear 4 directly connected to the governor.

However, if a torque exceeding a predetermined level is applied to the meshing part of the gear due to rotational fluctuations that occur when starting, shifting, etc., the friction piece 5
Sliding occurs on the friction surface of the drive gear 2, causing the drive gear 2 to rotate relative to the rotating shaft 1, and the drive gear 2 moves slightly in the axial direction, so that the surface pressure applied to the tooth surfaces of the drive gear 2 and the driven gear 4 is maintained at a constant value. I will explain it below.

As described above, according to the present invention, with a simple configuration, the surface pressure applied to the rotationally fluctuating tooth surface can be kept below a certain value to prevent damage to the governor drive section, and stable driving can be performed for a long period of time. The practical effects are extremely impressive.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional governor drive part, and FIG. 2 is a new view showing an example of the governor drive part according to the present invention. 1... Rotating shaft, 1a... Flange surface,
1b... Fixed ring, 2... Governor drive gear, 2a. 2b... End face, 4... Driven gear,
5...Friction piece, 6...Elastic member.

Claims (1)

[Scope of utility model registration request] A drive-side governor drive gear that intersects and meshes with a driven gear that is directly connected to the governor via a threaded gear is rotatably inserted into the rotating shaft of the automatic transmission, and one end face of the governor drive gear and a rotation opposite to the end face are rotatably inserted into the rotating shaft of the automatic transmission. An automatic transmission for a vehicle, characterized in that a friction piece is interposed between the flange surfaces of the shaft, and an elastic member is provided for pressing the governor drive gear against the flange surface of the rotating shaft with a predetermined pressure. governor drive device.