JPS59200866A - Lubricating oil supplying mechanism for automatic speed change device - Google Patents

Abstract

PURPOSE:To permit to supply the lubricating oil by a necessary amount by a method wherein a pressure regulating valve, generating a line pressure at the side of an oil pressure source and flowing out excess oil to the necessary part of the lubricating oil, and a non-return valve, opening at a pressure higher than set pressure, are provided in a parallel between the oil pressure source and the necessary part of the lubricating oil. CONSTITUTION:The pressure regulating valve 4, generating an operating oil pressure for an oil pressure servo at the side of oil pressure source 11 and flowing out the excess oil to the necessary part of lubricating oil, and the non-return valve 5, opening at a pressure higher than the set pressure and leaking the pressure oil at the side of the oil pressure source 11 to the necessary part of lubricating oil, are provided in parallel between the oil pressure source 11 and the necessary part of lubricating oil. According to this method, the amount of the lubricating oil may be reduced when a prime mover is rotating at a low speed and the oil pressure at the side of the oil pressure source 11 is low. In case the prime mover is rotating at a high speed, the oil pressure at the side of the oil pressure source 11 is high and a plenty of lubricating oil is necessitated for cooling or the like of the speed change device rotating at a high speed, plenty of lubricating oil may be supplied. Accordingly, the lubricating oil may be supplied by the necessary amount.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lubricating oil supply mechanism for supplying lubricating oil to parts of an automatic transmission that require lubrication.

Conventionally, in automatic transmissions, a hydraulic power source generates line pressure in four oil passages to generate, for example, the control hydraulic pressure of a hydraulic control circuit or the operating hydraulic pressure of a hydraulic servo for a frictional engagement element, and the excess oil is used for lubrication. A pressure regulating valve is used to drain the oil into the oil supply line. In addition, if a throttle valve is installed in parallel with this pressure regulating valve, and the hydraulic pressure in the oil passage is low and the supply of lubricating oil from the pressure regulating valve is stopped, the 1 (7J =I It is possible to supply the minimum amount of lubricating oil necessary to prevent injury.However, with a tie valve, the flow rate from the tie valve is adjusted to an appropriate level according to the operating conditions such as the rotational speed of the prime mover. Because it is difficult to
Even at low rotation speeds of the transmission, where less lubrication &t+ m is required, the amount of lubricating oil is greater than the required amount o''t.

For this reason, the rotational speed of the prime mover is low, and as a result, more than the required Ln of oil leaks into the lubricating oil supply oil path through the throttle valve, even on the platform where the oil pressure of the oil pressure source is low. In some cases, the oil pressure of the engine became even lower, making it difficult to maintain the required oil pressure.

The purpose of the present invention is to reduce the amount of lubricating oil when the prime mover rotates at a low speed and the hydraulic pressure of the hydraulic source is low, and to reduce the amount of lubricating oil used when the prime mover rotates at high speed and the hydraulic pressure of the hydraulic source is high. An object of the present invention is to provide a lubricating oil supply mechanism for a transmission that can supply a large amount of lubricating oil under operating conditions where the transmission rotates at high speed and requires a large amount of lubricating oil for cooling and the like.

The present invention provides a pressure regulating valve that is provided between a hydraulic power source oil passage and a lubricating oil supply oil passage, and that increases or decreases the degree of communication between these oil passages in accordance with at least an input oil pressure related to a prime mover output; A check valve is arranged in parallel with the pressure valve, and when the oil pressure in the oil passage is higher than a set value, the oil pressure source leaks the pressure oil in the oil passage to the lubricating oil supply passage.

Next, the present invention will be explained based on embodiments shown in the drawings.

FIG. 1 shows the hydraulic adjustment device part of the hydraulic control system of an automatic transmission, where 1 is an oil strainer provided in an oil reservoir, 11 is an oil pump (hydraulic source) driven by a prime mover, A hydraulic source discharges oil in an oil reservoir through an oil strainer 1 to a first oil passage 12 which is an oil passage.

3 is a first pressure regulating valve installed between the first oil passage 12 and a second oil passage to be described later; 13 is a lubricating oil supply oil passage for the first oil passage 12; , a second oil passage which is an oil passage beside the hydraulic source for the lubricating oil supply passage to be described later; 4 is provided between the second oil passage and the lubricating oil supply passage to be described later; A second pressure regulating valve, 14 is a lubricating oil supply oil passage, 15 is a throttle valve provided between the first oil passage and the second oil passage in parallel with the first pressure regulating valve, and 1G is a second oil passage. 17 is a relief valve provided in the first oil passage 12; 5 is the gist of the present invention; 2 oil passage 13 and d) 1 lubricant supply oil passage 14
The second oil passage 13 and the lubricating oil supply oil passage 14 are installed in parallel with the second pressure regulating valve i3J and the shoring valve 16 between the
A check valve 6 is installed between the check valve 5 and the lubricant supply line 14 to flow the pressure oil in the second oil line 13 to the lubricant supply line 14 when the oil pressure difference is greater than or equal to a set value. In this example, the restriction valves 15 and 1G each have an orifice having a set diameter.

The first pressure regulating valve 3 includes a spool 31 having a spring 32 on one side (lower side in the figure) and a plunger 33 arranged in series below the spool 31. The spool 31 receives the hydraulic pressure of the first oil passage from the other side (upper side in the figure) through the orifice 311 to the effective pressure receiving surface of the upper land 312, and on the other hand receives the spring load of the spring 32 and the pressing force of the plunger v-33. is displaced to adjust the degree of communication between the first oil passage 12 and the second oil passage 13, and generate a line pressure in the first oil passage 12 that is used as the control pressure of the hydraulic control device and the operating pressure of the hydraulic servo. Then, the excess oil flows out into the second oil passage 13. The plunger 33 receives line pressure from a hydraulic control device via an oil passage 21 to a large-diameter land 331 in the upper part of the figure.
At the same time, the small diameter land 3 shown in the lower part of the figure is connected via the oil passage 22.
At 32, the spool 31 is pushed upward in the drawing in response to an input hydraulic pressure related to the output of the prime mover, such as a throttle pressure from a hydraulic control device. The second oil passage is an oil passage that supplies hydraulic oil to a fluid coupling such as a torque converter or a fluid coupling.

The second pressure regulating valve 4 is a spool 4 on which a spring 41 is installed on its back.
Equipped with 3. The spool 43 is connected to the lower end land 4 from the bottom in the figure.
Input oil pressure related to the output of the prime mover, such as throttle pressure, is applied to 11 via the front oil distribution path 22, and the spring load of the spring 41 is applied to the orifice 45 from above in the figure.
The oil pressure of the second oil passage is applied to the illustrated upper end land 433 through the 433 to adjust the degree of communication between the second oil passage 13 and the lubricating oil supply oil passage 14, and the second oil passage is connected to the IC, for example, as described above. A torque converter pressure is generated as shown in FIG.

The throttle valve 15 constantly communicates the first oil passage 12 and the second oil passage 13, and always supplies the minimum necessary pressure oil from the first oil passage 12 to the second oil passage 13. . The throttle valve 1G constantly communicates the second oil passage 13 and the lubricating oil supply oil passage 14, and supplies the pressure oil of the second oil passage 13 directly to the oil passage 14 to prevent burning in parts that require lubrication. The minimum necessary pressure oil is supplied to the lubricating oil supply oil passage 14.

The check valve 5 has a spring 52 on its back and a check ball 53 for opening and closing the valve port 51. When the oil pressure in the second oil passage 13 is higher than a set value, the check valve 5 opens the valve opening 51 to reduce the pressure in the oil passage 13. The oil is prevented from flowing into the oil passage 14 through the squeeze valve 6.

The lubricating oil supply mechanism of this transmission operates as follows.

When the rotational speed of the prime mover is high and the amount of oil discharged by the oil pump 11 is large, the oil pressure in the oil passage 12 becomes high, and the spool 31 of the first pressure regulating valve 3 is moved as shown in FIG. It is pushed down to increase the degree of communication between the oil passages 12 and 13. As a result, the oil pressure in the first oil passage 12 (line pressure) is lowered and the pressure in the line I is adjusted to the adjusted value, and a large amount of hydraulic oil flows out into the second oil passage 13. In addition, when the engine speed is low and the amount of oil discharged by the oil pump 11 is small, the oil pressure in the first oil passage 12 decreases, so the spool is displaced upward in the figure as shown in the left half of the figure. The degree of communication of the passage 13 is reduced to prevent a drop in the oil pressure of the first oil passage 12, thereby preventing an excessive drop in line pressure. At this time, the first oil passage 12 and the second oil passage 13 communicate with each other via the throttle valve 15, so that the minimum necessary amount of hydraulic oil is supplied to the oil passage 13.

When a large amount of hydraulic oil is supplied to the second oil passage 13 and the oil pressure is high, the spool 43 of the second pressure regulating valve 4 is not pushed downward as shown on the right hand side of the figure. Communication with the oil passage 13 is increased.

Further, when the pressure difference between the oil passage 13 and the oil passage 14 is equal to or higher than a set value, the check valve 5 is opened, and the oil passage 14 is communicated with the U ground passage 13 via the check valve 5. As a result, when the pressure regulation exceeds the set value, the tie valves 1G, which are connected in parallel to the oil passage 14,
A large amount of lubricating oil is supplied through the second pressure regulating valves 4 and d5 and the check valve 5, and a large amount of lubricating oil is supplied to the transmission, which is required during the high speed rotation of the first gear. Also, the second oil path 1
When the oil pressure difference in the third lubricating oil supply path 14 is less than the set value, the check valve 5 closes the valve port, and lubricating oil is supplied to the lubricating oil path 13 via the second pressure regulating valve 4 and the throttle valve 1G. When the oil pressure of the second oil passage 13 is lower, the spool of the second pressure regulating valve 4 blocks the communication between the second oil passage 13 and the lubricating oil supply oil passage 14 as shown in the left half of the figure. Almost no lubricating oil flows from the oil passage 13 to the oil passage 14 via the pressure regulating valve, and is supplied to the lubricating oil supply oil passage 14 only via the throttle valve 16.

In the above embodiment, the case where the pressure regulating valve, the throttle valve, and the check valve are all arranged in parallel in J3 has been described, but when the pressure regulating valve and the check valve are arranged in parallel, This has a considerable effect, and by inserting the throttle valve C in series with the check valve, the ability to adjust the amount of lubricating oil supplied when the oil pressure in the oil passage is high can be increased.

As described above, in the lubricating oil supply mechanism of the transmission of the present invention, the hydraulic source is installed between the first oil passage and the lubricating oil passage, and the first oil passage and the second oil passage are communicated with each other according to the input horn. It consists of a pressure regulating valve that increases or decreases the area, and a check valve that is parallel to the pressure regulating valve and that leaks the pressure oil in the first oil passage to the second oil passage when the oil pressure in the first oil passage is equal to or higher than a set value. , Is there lubrication when the prime mover is at low rotation speed and the oil pressure in the oil pressure source is low? The amount of lubricant can be reduced, the pressure in the first oil path 12 can be maintained, the prime mover can rotate at high speed, the hydraulic pressure of the hydraulic source is high, and the speed change (in some cases, a large amount of lubricating oil is required for cooling, etc.) Under such operating conditions, a large amount of lubricating oil can be supplied.

[Brief explanation of the drawing]

FIG. 1 is a hydraulic circuit diagram showing a lubricating oil supply mechanism for a transmission according to the present invention. In the figure 2...1st pressure regulating valve 3...281st. ν pressure valve 4...Check valve 15.16...Squeeze valve

Claims (1)

[Scope of Claims] A pressure regulating valve in which a hydraulic pressure source is provided between the oil passage and the lubricating oil supply passage, and increases or decreases the degree of communication between these oil passages in accordance with at least the input oil pressure related to the output of the prime mover. and a check valve which is parallel to the pressure regulating valve and which leaks the pressure oil in the oil passage from the oil pressure source to the lubricating oil supply oil passage when the oil pressure in the oil passage from the oil pressure source exceeds a set value. Lubricating oil supply mechanism. 2) A hydraulic pressure source is provided between the lubricating oil path and the lubricating i+1+ path, and a pressure regulating valve that increases or decreases the degree of communication between these hydraulic pressures according to at least an input hydraulic pressure related to the prime mover output, and the pressure regulating valve is arranged in parallel; When the oil pressure in the oil passage is higher than the set value, the oil pressure in the oil passage is reversed (L) without leaking into the lubricating oil supply oil passage.
A lubricating oil supply mechanism for an automatic transmission, comprising a valve, and a throttle valve that is arranged in parallel with the pressure regulating valve and the check valve and connects a hydraulic pressure source oil passage and a lubricating oil supply oil passage. 3) Provided in the hydraulic control device of the automatic transmission, the hydraulic pressure supplied from the hydraulic source is regulated in accordance with at least the input hydraulic pressure related to the prime mover output, and the first hydraulic pressure is generated in the first oil path. a first pressure regulating valve that causes oil to flow out into a second oil passage;
A second pressure regulating valve that regulates the hydraulic pressure of the second oil passage to generate a second oil pressure in the second oil passage and causes excess oil to flow out to a third oil passage that is a lubricating oil supply oil passage. In the lubricating oil supply mechanism of the device, a valve is arranged between the second oil passage and the third oil passage in parallel with the second pressure regulating valve, and when the second oil pressure is equal to or higher than a set value, the pressure oil of the second and first passages is supplied to the second oil passage. 3. A lubricating oil supply mechanism for an automatic transmission, characterized in that a check valve for leakage is provided in three oil passages. 4) It is installed in an automatic variable and quick-change hydraulic pressure control device, and regulates the hydraulic pressure supplied from the hydraulic source according to at least the input hydraulic pressure related to the prime mover output, generates the first hydraulic pressure in the first oil path, and removes excess oil. a first pressure regulating valve that causes oil to flow out into a second oil passage; Lubricating oil for an Al pressure regulating M device, which is equipped with a second pressure regulating valve that causes the oil to flow into the third oil passage, and a squeezing valve that is parallel to the second pressure regulating valve and communicates the pressure oil in the second oil passage with the third oil passage. In the supply mechanism, between the second oil passage and the third oil passage, the second g+,! l
A check valve is installed in parallel with the J-l-valve to prevent the pressure oil in the second oil path from leaking into the third oil path when the second oil pressure is above the set value J.
A lubricating oil supply mechanism for an automatic transmission characterized by J. 5) A system is installed in the hydraulic control circuit of the automatic transmission to adjust the hydraulic pressure supplied from the hydraulic source to a low level according to the input hydraulic pressure related to the prime mover output, and supply the first to third pressure to the first oil path. a first pressure regulating valve that generates excess oil and causes excess oil to flow into a second oil passage;
a second pressure regulating valve that generates hydraulic pressure and causes excess oil to flow into a third oil passage, which is a lubricating oil supply oil passage; In the lubricating oil supply mechanism of the hydraulic pressure regulating device, the lubricating oil supply mechanism includes a throttle valve that communicates with Lubrication of an automatic transmission characterized by providing an IC check valve to prevent pressure oil in the second oil path from leaking to the third oil path in the above case, and a throttle valve connected in series with the check valve. Oil supply machine (j'j.