JP4795983B2 - Transmission oil system - Google Patents

Description

  The present invention relates to an oil system for a transmission, which is applied to a transmission of a vehicle and the like, and is provided with a hydraulic pressure adjusting valve for adjusting the hydraulic pressure of the torque converter oil passage in a torque converter oil passage connecting an oil pump and a torque converter.

FIG. 4 is a system diagram of an oil system that supplies and discharges hydraulic oil and lubricating oil (hereinafter collectively referred to as oil) in a vehicle transmission.
In FIG. 4, the oil in the oil tank denoted by reference numeral 106 is sent to the torque converter 102 through the transmission control valve 104 and the torque converter relief valve 103 by the oil pump 105. The oil discharged from the torque converter 102 is returned to the oil tank 106 through the oil discharge passage 112. The relief oil discharged from the torque converter relief valve 103 is returned to the oil tank 106 through a return oil passage 109 connected to the relief oil outlet of the torque converter relief valve 103.

  FIG. 5 is a schematic longitudinal sectional view showing the structure around the transmission of the vehicle. In FIG. 5, in the transmission case denoted by reference numeral 107, a PTO case 3 of a PTO (external output extraction) device 1 is formed integrally with the transmission case by fixing with a plurality of bolts or casting. The PTO chamber 2 in the PTO case 3 accommodates a PTO gear 2 for taking out the output, and the PTO gear 2 is lubricated by splashing oil spilled from the transmission case 107.

  In Patent Document 1 (Japanese Patent Application Laid-Open No. 2002-130447), there is a front chamber in which a relatively large gear such as an idler gear is accommodated by a partition, a small gear and an output shaft in the transmission case. It is divided into rear chambers to be arranged, and repellent oil from idler gears etc. is guided to the rear chambers by the projections provided in the front chambers and the lubricating oil passage holes provided in the partition walls. A lubricating structure for a transmission configured to lubricate a seal portion is disclosed.

JP 2002-130447 A

  However, in the conventional transmission oil system shown in FIGS. 4 and 5, the lubrication of the PTO gear 2 and the bearings that support the PTO gear 1 in the PTO device 1 is caused by the spilled oil from the inside 107 a of the transmission case 107. Since it is performed by repelling, the amount of lubricating oil to the tooth part of the PTO gear 2 and the bearings supporting it may be insufficient as a whole. Therefore, a meshing portion that is not lubricated at all occurs due to the insufficient amount of the lubricating oil, and this portion tends to be worn or seized.

  Further, in the technique disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2002-130447), a transmission chamber includes a front chamber that is a main gear chamber in which relatively large gears are accommodated by a partition wall. Lubricating the output shaft and small diameter gears provided in the rear chamber is divided into a rear chamber in which the output shaft and small diameter gears are housed. Lubricating oil passage holes provided in the projections and partition walls provided in the front chamber Therefore, there is a concern that the amount of lubricating oil may be insufficient as in the prior art shown in FIGS. 4 and 5.

  In view of the problems of the prior art, the present invention makes it possible to secure a sufficient amount of lubricating oil to the PTO (output take-out) device of the transmission, such as the PTO gear 2 in the PTO device and the bearings that support it. It is an object of the present invention to provide an oil system for a transmission that prevents an insufficient amount of lubricating oil in a portion requiring lubrication and prevents the occurrence of wear and seizure.

The present invention achieves such an object, and a hydraulic pressure adjusting valve that adjusts the hydraulic pressure of the torque converter oil passage is connected to a torque converter oil passage through which oil is connected to an oil pump and the torque converter. In the transmission oil system provided, the return of the relief oil is connected to the relief oil outlet of the hydraulic pressure regulating valve and guides all of the relief oil from the hydraulic pressure regulating valve into the PTO chamber of the transmission PTO (output take-out) device. An oil passage is provided, and the relief oil introduced into the PTO chamber is jetted into the PTO chamber and the PTO gears and bearings are splashed and lubricated by lubrication , and the drained oil after lubrication is oiled from the PTO chamber. it characterized in that a PTO discharge oil passage leading to the tank.

  Further, the present invention includes a configuration in which an orifice for restricting the passage area of the return oil passage is installed in the upstream portion of the PTO device in the return oil passage of the relief oil.

According to the present invention, the relief oil from the hydraulic pressure adjusting valve that adjusts the hydraulic pressure of the torque converter oil passage is introduced into the PTO (output take-out) device of the transmission, and the relief oil is ejected into the PTO chamber, thereby causing the gear of the PTO device. Since the oil is repelled and lubricated by refueling and the oil discharged from the PTO chamber is led to the oil tank, the gear of the PTO device and the gear are supported by the relief oil from the hydraulic pressure regulating valve that can obtain a sufficient amount of lubricating oil. The bearings can be lubricated.
As a result, it is possible to reliably avoid the lack of lubricating oil amount in the tooth portion of the PTO gear and the bearings supporting it, and wear of the gear meshing portion and bearings and the shaft seal portion of the PTO device due to the lack of lubricating oil amount. It can prevent the occurrence of burn-in.

  Conventionally, the relief oil from the hydraulic pressure adjusting valve for adjusting the hydraulic pressure of the torque converter oil passage has been returned to the oil tank as it is. In the present invention, the oil tank is used after this relief oil is used for lubrication of the PTO device. Therefore, the relief oil can be used effectively without connecting a return oil pipe from the hydraulic control valve to the PTO device and providing a special device.

  In addition, if an orifice that restricts the passage area of the return oil passage is installed upstream of the PTO device in the return oil passage of the relief oil, the oil amount of the relief oil is increased to an appropriate value by the orifice. It is possible to limit the oil amount of the relief oil to the PTO device, and the rotational resistance of the PTO gear accompanying the stirring of the oil in the PTO chamber by the PTO gear due to the excessive relief oil amount. And increase in power loss can be prevented.

  Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this example are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only.

FIG. 1 is a system diagram of an oil system for supplying and discharging transmission oil in a vehicle transmission according to a first embodiment of the present invention. FIG. 2 is a schematic longitudinal sectional view showing the structure around the transmission in the first embodiment.
In FIG. 2 showing the structure around the transmission, the transmission is denoted by reference numeral 100, and the PTO case of the PTO (external output extraction) device 1 is provided on the rear end surface of the transmission case 107 in which the gears of the transmission 100 are accommodated. 3 is fixed by a plurality of bolts (107a indicates the inside of the transmission case 107). A PTO chamber 2 in the PTO case 3 accommodates a PTO gear 2 for taking out the output. 102 is a torque converter, and 115 is an output shaft of the torque converter 102.
A transmission control valve 104 and a torque converter relief valve 103 are attached to the transmission case 107.

The basic configuration of the transmission 100 described above is the same as that of the conventional one. In the present invention, the lubrication system of the PTO device 1 in the transmission 100 is improved.
In FIG. 1 showing the oil system of the transmission, the oil in the oil tank 106 indicated by reference numeral 106 is conveyed by the oil pump 105 through the transmission control valve 104 and the torque converter oil passage 113, and passes through the torque converter relief valve 103. It is sent to the torque converter 102. Oil discharged from the torque converter 102 is returned to the oil tank 106 through the oil discharge passage 112 or by lubricating and cooling each part of the transmission.

In the present invention, as shown in FIGS. 1 and 2, a leaf valve drain passage 109, which is a passage for relief oil discharged from the torque converter relief valve 103, is connected to the PTO device 1, and the relief oil is supplied to the PTO device 1. By spraying into the chamber 4, the PTO gear 2, the bearings supporting it, the output shaft 115, etc. are repelled and lubricated by lubrication.
The oil discharged after lubricating the PTO device 1 is returned to the oil tank 106 through the PTO oil discharge passage 120.

According to the first embodiment, the relief oil from the torque converter relief valve (hydraulic pressure regulating valve) 103 that adjusts the hydraulic pressure of the torque converter oil passage 113 to the torque converter 102 is supplied to the PTO (output extraction) device 1 of the transmission 100. By introducing and ejecting the relief oil into the PTO chamber 4, the PTO gear 2 of the PTO device 1, the output shaft 115 and the like are repelled and lubricated by lubrication, and the oil discharged from the PTO chamber 4 is supplied to the oil tank 106. Since it is configured to guide, the PTO gear 2 of the PTO device 1 and the bearings that support it, the output shaft 115, and the like can be lubricated by the relief oil from the torque converter relief valve 103 that provides a sufficient amount of lubricating oil. .
Thereby, the shortage of the lubricating oil amount to the tooth portion of the PTO gear 2 can be reliably avoided, and the occurrence of wear and seizure of the meshing portion of the gear and the shaft seal portion of the output shaft 115 due to the shortage of the lubricating oil amount can be prevented.

  Conventionally, the relief oil from the torque converter relief valve 103 that adjusts the hydraulic pressure of the torque converter oil passage is returned to the oil tank 106 as it is. In the present invention, this relief oil is used to lubricate the PTO device 1. Since it is configured so as to be returned to the oil tank 106 after being used for the above, only a return oil pipe (relief valve drain passage 109) from the torque converter relief valve 103 is connected to the PTO device 1 to provide a special device. The relief oil can be used effectively.

FIG. 3 is a system diagram of an oil system in a vehicle transmission according to a second embodiment of the present invention.
In the second embodiment, the orifice 5 that restricts the passage area of the return oil passage 109 to the upstream portion of the PTO device 1 of the return oil passage (relief valve exhaust passage 109) of the relief oil from the torque converter relief valve 103. Is installed. Other configurations are the same as those of the first embodiment shown in FIGS. 1 and 2, and the same members are denoted by the same reference numerals.

  According to the second embodiment, the oil amount of the relief oil from the torque converter relief valve 103 can be limited to an appropriate value by the orifice 5, and the oil amount of the relief oil to the PTO device 1 can be limited. Can be suppressed, and an increase in rotational resistance of the PTO gear 2 and an increase in power loss due to the stirring of the oil in the PTO chamber 4 by the PTO gear 2 due to the excessive amount of relief oil can be prevented.

  According to the present invention, it is possible to ensure a sufficient amount of lubricating oil to the PTO (output take-out) device of the transmission. It is possible to provide a transmission oil system that prevents the occurrence of burn-in.

1 is a system diagram of an oil system for supplying and discharging transmission oil in a transmission of a vehicle according to a first embodiment of the present invention. It is a longitudinal direction cross-sectional schematic diagram which shows the structure around the transmission in the said 1st Example. FIG. 3 is a view corresponding to FIG. 1 showing a second embodiment of the present invention. It is a figure corresponding to FIG. 1 which shows a prior art. It is a figure corresponding to FIG. 2 which shows a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 PTO (outside output extraction device) 2 PTO gear 3 PTO case 4 PTO chamber 5 Orifice 100 Transmission 102 Torque converter 103 Torque converter relief valve 104 Transmission control valve 105 Oil pump 106 Oil tank 107 Transmission case 109 Leaf valve oil passage 113 Torque converter oil passage 115 Output shaft 120 PTO oil drain passage

Claims (2)

In an oil system for a transmission in which an oil pressure adjusting valve for adjusting the oil pressure of the torque converter oil passage is provided in a torque converter oil passage that connects an oil pump and a torque converter and through which oil flows to the torque converter.
Connected to the relief oil outlet of the hydraulic pressure regulating valve, a relief oil return oil passage is provided for guiding all of the relief oil from the hydraulic pressure regulating valve into the PTO chamber of the transmission PTO (output take-out) device. The guided relief oil is jetted into the PTO chamber and the PTO gear and bearings are repelled and lubricated by lubrication , and a PTO exhaust oil passage is provided for guiding the drained oil after lubrication from the PTO chamber to the oil tank. An oil system for transmissions. 2. The transmission oil system according to claim 1, wherein an orifice for restricting a passage area of the return oil passage is installed at an upstream portion of the PTO device in the return oil passage of the relief oil .

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