Lubrication – Systems – Gearing
Patent
1983-06-29
1985-09-17
Brown, David H.
Lubrication
Systems
Gearing
74467, 184 619, F16H 5704, G05G 300
Patent
active
045415102
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a transmission of a vehicular engine or the like and, more particularly, to a shift fork lubricating system for the shift gear of the transmission.
BACKGROUND ART
In a transmission of a vehicular engine or the like, generally speaking, shift forks borne on a shift fork shaft in a manner to slide axially thereof are desired partly to supply a sufficient amount of lubricating oil between the forked pawl portions formed at the leading ends thereof and shift gears engaging with the pawl portions irrespective of the positions of shift forks on the shift fork shaft thereby to ensure smooth rotations of the shift gears, partly to supply a sufficient amount of lubricating oil between the shift fork shaft and the bearing portions of the shift forks thereby to ensure smooth and light sliding motions of the shift forks to the right or left, and partly to accurately move in parallel on the shift fork shaft at all times, whereby the operations of the transmission and the gear changing operations may always be conducted properly and efficiently as a whole.
DISCLOSURE OF THE INVENTION
It is a major object of the present invention to provide a shift fork lubricating system for use in a transmission, which is enabled to satisfy the aforementioned desires although it has a simple construction.
In order to achieve the aforementioned object, according to the present invention, there is provided a shift fork lubricating system for a transmission of the type wherein shift forks have their bearing portions slidably fitted and supported on a shift fork shaft and their forked pawl portions formed at their leading ends for engagement with the circumferential grooves of shift gears so that the shift gears are shifted by the sliding controls of the shift forks, the shift fork lubricating system being characterized in that the bearing portions of the shift forks have their inner circumferences formed at their center areas with annular oil grooves, respectively, which are axially elongated and which are always in communication with oil ports opened to the outer circumference of the shift fork shaft; that the shift forks have their inner circumferences formed at both the sides of the annular oil grooves with pairs of sliding faces which have a substantially equal axial length and which are made slidable on the shift fork shaft; and that the shift forks are formed therein with oil passages, respectively, which are opened to the forked pawl portions thereof and which communicate with the annular oil grooves.
According to the construction thus far described, the shift forks can always be controlled to accurately slide in parallel on the shift fork shaft, while being prevented from falling in the sliding direction, so that the sliding controls of the shift forks to the right or left can always be performed properly, smoothly and lightly.
Moreover, the sliding faces formed on the bearing portions of the shift forks are made to have a substantially equal length in the axial direction so that they can be uniformly bored by a turning or the like operation.
Still moreover, since the shift forks are provided therein with oil passages which are opened into the forked pawl portions thereof and which are communicated with the annular oil grooves, lubricating oil can be supplied through the oil ports, the annular oil grooves and the oil passages to the engagement portions between the forked pawl portions and the shift gears, no matter where the shift fork may be shifted, so that the shift forks can have their sliding faces effectively lubricated.
Furthermore, if the aforementioned forked pawl portions are formed with notched grooves which are in communication with the oil passages and which are opened into the end faces and both the side surfaces thereof, the lubricating oil flows through the oil passages to the notched grooves, from which the oil is then supplied simultaneously to the bottom faces and both the side surfaces of the circumferential grooves of the shift gears so that it can
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Itoh Kazuhito
Kondo Makoto
Brown David H.
Griffiths John E.
Honda Giken Kogyo Kabushiki Kaisha
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