JPS6117454Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a governor hydraulic pressure generating device applied to an automatic transmission.

In general, vehicle speed detection in an automobile transmission is performed using the hydraulic pressure generated by a governor device provided on the output shaft of the transmission.

However, the actual vehicle speed is obtained by rotating the wheels at the rotation speed after the rotation speed of the output shaft of the transmission has been finally reduced by the differential section. That is, even if the transmission is the same, if the final reduction ratio changes, the appropriate vehicle speed cannot be detected unless the governor device is changed accordingly.

Therefore, as commercial vehicles (trucks) and other vehicles are manufactured in a variety of ways by changing the final reduction ratio, or differential device, depending on the purpose of use of the vehicle, it is necessary to manufacture several types of governor devices accordingly. However, doing so would result in a significant cost increase.

Therefore, in the present invention, the output shaft and the governor device are engaged with gears via a support member, and each time the final reduction ratio changes, the number of teeth on the gear is changed to enable speed increase or deceleration with respect to the output shaft, and the vehicle speed can be detected. The present invention provides a governor hydraulic pressure generating device whose main feature is that the above-mentioned drawbacks are eliminated by making it possible to do so.

This invention consists of a fixed shaft member placed parallel to the output shaft of the transmission, a drive gear fixed to the output shaft of the transmission, and a fixed shaft member supported at both ends via bearings. A support member in which a driven gear that meshes with a drive gear is formed at a substantially external position of a bearing at one end, and a position that is substantially symmetrical with respect to the axis across the outer peripheral surface of the support member at approximately the center in the axial direction. A governor valve device consisting of first and second governor bodies, each housing a governor valve, is held in This is a governor hydraulic pressure generating device configured to include an oil passage that is connected to be relatively slidable and communicates the oil passage of the first and second governor bodies with an external hydraulic control device.

Hereinafter, embodiments of the present invention will be described based on the drawings. A governor drive gear 102 is mounted on the transmission output shaft 100 and fixed with a key 101 in its rotational direction. Governor support 103
has a substantially cylindrical shape, and has a toothed portion (driven gear portion) 103a that meshes with the drive gear 102 at one end in the axial direction. The governor body of the governor valve device 104 is held by the outer circumferential surface of the governor support 103, and the governor valves 105 and 106 are slidably fitted in the axial direction thereof. The fixed shaft member 107 fits into the inner circumferential surface of the governor support 103, rotatably supports both end portions of the governor support 103 via bearings 108 and 109, and connects to an oil path from the governor body 104 (not shown). Oil passage 107a, 1 communicating with the colander hydraulic control device
07b and 107c and are fixed to the transmission case or the like.

The governor body includes a first governor body 115 housing the governor valve 105 and a governor valve 106.
and a second governor body 116 that accommodates the governor support, and these two governor bodies are arranged at symmetrical positions across the governor support rotation axis.

Next, the connection relationship of the oil passages of this governor device will be explained with reference to the schematic diagram of FIG. 2. In Figure 2, the first
Governor body 115 has ports 104a, 104
b, 104c, and a governor valve 105
The second governor body 116 accommodates port 10.
4d, 104e, and 104f, and accommodates the governor valve 106. Ports 104c and 104f are discharge ports communicating with the oil reservoir, and can be controlled to open and close by large-diameter lands of valves 105 and 106, respectively. Port 104a connects oil passage 107a to a hydraulic source.
Governor valve 10 with an input port communicating through
5 small diameter lands can be opened and closed. An output port 104b located between the port 104a and the discharge port 104c is taken out to the outside via an oil passage 107b, used as first governor pressure, and communicated with an input port 104d of the second governor. The opening and closing of the port 104d can also be controlled by the small diameter land of the governor valve 106. A port 104e disposed between the port 104d and the discharge port 104f is taken out to the outside through an oil passage 104c and used as second governor pressure.

Thus, when the output shaft 100 rotates, the shaft 100
The governor drive gear 102 fixed to the drive gear 102 also rotates, and the governor support 103 meshing with the drive gear 102 is also changed to a set tooth ratio and rotates to drive the governor valve device 104. Governor valves 105 and 106 housed in the device 104 generate governor pressure (corresponding to the rotational speed of the output shaft 100, that is, the vehicle speed) that is balanced by the centrifugal force applied to the valves themselves, and directs the pressure to the oil passage of the governor body 104. The oil is then sent to the hydraulic control device via oil passages 107b and 107c of the fixed shaft member 107.

As is clear from the above explanation, according to the governor hydraulic pressure generating device of the present invention, there is no need to change the governor device unlike the conventional device even for vehicles with different final reduction ratios, and the governor drive gear is connected to the driven gear of the governor support. The fact that it is only necessary to change the numerical ratio, that is, the same governor device can be used in a variety of vehicles, which leads to cost reduction, and the fact that the governor hydraulic characteristics at low speed rotation of the output shaft (relationship between rotation speed and generated oil pressure) ), you can easily obtain it by increasing the rotational speed of the governor support relative to the output shaft by changing the ratio of the respective teeth, based on the relationship that the governor oil pressure is proportional to the square of the rotational speed. Furthermore, both ends of the governor support are supported by a fixed shaft member through bearings, and the driven gear is formed approximately on the outer periphery of the bearing at one end, and the shaft center is sandwiched approximately in the center in the axial direction. By arranging the first and second governor bodies in symmetrical positions, the entire device can be made compact.Even if the device of the present invention is attached to a transmission, its axial length will not be increased. It is effective. Furthermore, since the governor support is compatible with the first and second governor bodies, you can also change the governor body.
The governor support can also be changed, which has the effect of increasing the degree of freedom in changing the governor hydraulic characteristics relative to vehicle speed.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the device of the present invention, and FIG. 2 is a schematic diagram illustrating the relationship between oil passages and valves. 100: Output shaft of transmission, 107: Fixed shaft member, 102: Drive gear, 108, 109: Bearing,
103a: driven gear, 103: support member,
105, 106: Governor valve, 115: First governor body, 116: Second governor body, 10
4: Governor valve device.

Claims (1)

[Scope of utility model registration request] an output shaft of a transmission, a fixed shaft member disposed parallel to the output shaft, a drive gear fixed to the output shaft, supported at both ends by the fixed shaft member via bearings, and A support member formed by forming a driven gear that meshes with a driving gear at a substantially outer circumferential position of a bearing at one end, and held in a substantially symmetrical position with an axis sandwiched between the outer circumferential surface of the support member at a substantially central portion in the axial direction. The first and second valves each house a governor valve.
a governor valve device comprising a governor body; and a bearing for supporting the support member of the fixed shaft member at both ends, the first and second valves being connected to the inner circumferential surface of the support member in a sealing manner and slidable relative to each other; A governor hydraulic pressure generator comprising an oil passage that communicates an oil passage in a governor body with an external hydraulic control device.