阅读说明：本技术 传动液压系统和工程机械 (Transmission hydraulic system and engineering machinery ) 是由 丁平芳 于世成 张书杰 于 2021-09-23 设计创作，主要内容包括：本发明公开一种传动液压系统和工程机械。传动液压系统包括变矩器、变矩器闭锁阀、变速箱控制阀组、第一液压泵、第二液压泵和润滑冷却油路。变矩器具有进油口、出油口以及闭锁控制油口。变矩器闭锁阀与闭锁控制口连接以控制变矩器是否闭锁。变速箱控制阀组用于控制变速箱挡位变换且包括变速箱控制油口。第一液压泵的出油口与变矩器的进油口连接以驱动变矩器动作。润滑冷却油路与第一液压泵的出油口连接且润滑冷却油路中设置有旋转件以使得从第一液压泵流出的油液对旋转件进行冷却。第二液压泵与变速箱控制阀组的变速箱控制油口以及变矩器闭锁阀连接以控制变速箱控制阀组和变矩器闭锁阀动作。本发明改善润滑冷却的油液流量不足。(The invention discloses a transmission hydraulic system and engineering machinery. The transmission hydraulic system comprises a torque converter, a torque converter locking valve, a gearbox control valve group, a first hydraulic pump, a second hydraulic pump and a lubricating and cooling oil way. The torque converter is provided with an oil inlet, an oil outlet and a lock control oil port. The torque converter lockup valve is connected with the lockup control port to control whether the torque converter is locked. The gearbox control valve group is used for controlling gear shifting of the gearbox and comprises a gearbox control oil port. An oil outlet of the first hydraulic pump is connected with an oil inlet of the torque converter to drive the torque converter to act. The lubricating and cooling oil path is connected with an oil outlet of the first hydraulic pump, and a rotating part is arranged in the lubricating and cooling oil path, so that oil flowing out of the first hydraulic pump cools the rotating part. The second hydraulic pump is connected with a gearbox control oil port of the gearbox control valve group and a torque converter locking valve to control the action of the gearbox control valve group and the torque converter locking valve. The invention improves the insufficient oil flow of lubrication and cooling.)

1. A transmission hydraulic system, comprising:

the torque converter (7) is provided with an oil inlet (A), an oil outlet (B) and a lock control oil port (C);

the gearbox control valve group (4) is used for controlling gear shifting of the gearbox and comprises a gearbox control oil port (D);

the converter locking valve (6) is connected with the locking control port (C) to control whether the converter (7) is locked or not; an oil outlet of the first hydraulic pump (31) is connected with an oil inlet (A) of the torque converter (7) to drive the torque converter (7) to act;

a lubricating and cooling oil path which is connected with an oil outlet of the first hydraulic pump (31) and is provided with a rotating part, so that the oil flowing out of the first hydraulic pump (31) cools the rotating part; and

and the second hydraulic pump (32) is connected with a gearbox control oil port (D) of the gearbox control valve group (4) and the torque converter locking valve (6) to control the actions of the gearbox control valve group (4) and the torque converter locking valve (6).

2. The transmission hydraulic system according to claim 1, comprising a first oil path connecting the first hydraulic pump (31) and an oil inlet (a) of the torque converter (7), a second oil path connecting the first oil path and the transmission control oil port (D), and an on-off valve (12) disposed on the second oil path, wherein the on-off valve (12) controls on-off of the second oil path.

3. The transmission hydraulic system according to claim 1, further comprising a pressure regulating valve (11), the pressure regulating valve (11) being disposed between the transmission control oil port (D) and the oil inlet port (a) of the torque converter (7).

4. The transmission hydraulic system of claim 1, further comprising a throttling element disposed on the lubrication cooling oil path upstream of the rotating member.

5. The transmission hydraulic system according to claim 1, characterized in that the gearbox control valve block (4) comprises at least two clutch control valves connected with the gearbox control port (D) for controlling at least two gear clutch engagements.

6. The transmission hydraulic system according to claim 1, characterized in that it comprises a double gear pump (3), said double gear pump (3) comprising said first hydraulic pump (31) and said second hydraulic pump (32).

7. The transmission hydraulic system according to claim 1, further comprising a first oil tank (1) and a cooler (8), the first hydraulic pump (31) drawing oil from the first oil tank (1), the cooler (8) being arranged between an oil outlet (B) of the torque converter and the first oil tank (1).

8. The transmission hydraulic system according to claim 7, further comprising a second oil tank (10), the second hydraulic pump (32) having two oil inlets, one of the two oil inlets drawing oil from the second oil tank (10).

9. The transmission hydraulic system according to claim 8, characterized in that the other of the two oil inlets of the second hydraulic pump (32) draws oil from the first oil tank (1) or from another oil tank.

10. A working machine, characterized by comprising a transmission hydraulic system according to any one of claims 1 to 9.

Technical Field

The invention relates to the field of hydraulic mechanical transmission, in particular to a transmission hydraulic system and engineering machinery.

Background

At present, a transmission system of a construction machine generally includes a torque converter, a transmission case, a drive axle, and the like, and the torque converter uses transmission oil as a working medium, realizes energy exchange through the flow of the oil, and generates a large amount of heat in the energy exchange process, so that low-pressure lubricating oil is required for cooling. And shifting of the transmission is achieved by electrically controlling the high pressure transmission oil to engage or disengage the clutch. The main function of the gearbox and the transaxle is to transmit power to the drive wheels, which is accomplished by rotating members consisting of gears, bearings, etc., which naturally heat up during operation due to power consumption. In the related art known to the inventor, the torque converter and the transmission are generally cooled forcibly, and the transaxle is naturally cooled due to space limitation or cost.

It is important to note here that the statements in this background section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

Disclosure of Invention

The invention provides a transmission hydraulic system and engineering machinery, aiming at solving the problem of insufficient oil flow for lubricating and cooling.

A first aspect of the present invention provides a transmission hydraulic system comprising:

the torque converter is provided with an oil inlet, an oil outlet and a lock control oil port;

the gearbox control valve group is used for controlling gear shifting of the gearbox and comprises a gearbox control oil port;

the torque converter locking valve is connected with the locking control port to control whether the torque converter is locked or not; an oil outlet of the first hydraulic pump is connected with an oil inlet of the torque converter to drive the torque converter to act;

the lubricating and cooling oil way is connected with an oil outlet of the first hydraulic pump and is internally provided with a rotating part so that oil flowing out of the first hydraulic pump cools the rotating part; and

and the second hydraulic pump is connected with a gearbox control oil port of the gearbox control valve group and the torque converter locking valve so as to control the actions of the gearbox control valve group and the torque converter locking valve.

In some embodiments, the transmission hydraulic system comprises a first oil path connecting the first hydraulic pump and an oil inlet of the torque converter, a second oil path connecting the first oil path and a control oil port of the gearbox, and an on-off valve arranged on the second oil path and controlling on-off of the second oil path.

In some embodiments, the transmission hydraulic system further includes a pressure regulating valve disposed between the transmission control oil port and the torque converter oil port.

In some embodiments, the transmission hydraulic system further includes a throttling element disposed on the lubrication cooling oil path upstream of the rotating member.

In some embodiments, the transmission control valve group comprises at least two clutch control valves connected with the transmission control oil port, and the at least two clutch control valves are used for controlling the engagement of at least two gear clutches.

In some embodiments, the transmission hydraulic system includes a duplicate gear pump including a first hydraulic pump and a second hydraulic pump.

In some embodiments, the transmission hydraulic system further includes a first oil tank from which the first hydraulic pump draws oil, and a cooler disposed between an oil outlet of the torque converter and the first oil tank.

In some embodiments, the transmission hydraulic system further includes a second oil tank, the second hydraulic pump having two oil inlets, one of the two oil inlets drawing oil from the second oil tank.

In some embodiments, the other of the two oil inlets of the second hydraulic pump draws oil from the first oil tank or from another oil tank.

The invention provides engineering machinery comprising the transmission hydraulic system.

Based on aspects provided by the invention, the transmission hydraulic system comprises a torque converter, a torque converter locking valve, a gearbox control valve group, a first hydraulic pump, a second hydraulic pump and a lubricating and cooling oil way. The torque converter is provided with an oil inlet, an oil outlet and a lock control oil port. The torque converter lockup valve is connected with the lockup control port to control whether the torque converter is locked. The gearbox control valve group is used for controlling gear shifting of the gearbox and comprises a gearbox control oil port. An oil outlet of the first hydraulic pump is connected with an oil inlet of the torque converter to drive the torque converter to act. The lubricating and cooling oil path is connected with an oil outlet of the first hydraulic pump, and a rotating part is arranged in the lubricating and cooling oil path, so that oil flowing out of the first hydraulic pump cools the rotating part. The second hydraulic pump is connected with a gearbox control oil port of the gearbox control valve group and a torque converter locking valve to control the action of the gearbox control valve group and the torque converter locking valve. The transmission hydraulic system of the invention is provided with two hydraulic pumps which are respectively a first hydraulic pump and a second hydraulic pump, wherein oil liquid flowing out of an oil outlet of the first hydraulic pump is divided into two branch paths to flow out, one branch path as transmission working oil liquid flows into a torque converter, the other branch path as lubricating and cooling oil liquid flows into a lubricating and cooling flow path to lubricate and cool a rotating member, the oil liquid flowing out of an oil outlet of the second hydraulic pump as control oil liquid flows into a lock valve of the torque converter and a control valve group of a gearbox to control the actions of the lock valve of the torque converter and the control valve group of the gearbox, so that the lubricating and cooling oil liquid and the control oil liquid are respectively provided by different hydraulic pumps, and the control oil liquid used for executing the gear shifting or locking process of the transmission hydraulic system and the lubricating and cooling oil used for lubricating and cooling the rotating member completely come from different oil sources, therefore, the problem of insufficient oil flow for lubrication cooling can be improved.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a schematic diagram of a transmission hydraulic system according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously positioned and the spatially relative descriptors used herein interpreted accordingly.

In the research process, the inventor of the present invention finds that in the related art, when the gear shifting action of the transmission and the locking state of the torque converter are simultaneously executed, the oil needs to satisfy the dosage of the gear shifting action of the transmission and the locking state of the torque converter, and the residual oil can be cooled to lubricate and cool the rotating member, so that the problem of insufficient lubrication and cooling oil can occur. Especially, when the shift clutch and the lockup clutch are frequently operated and there is leakage, the problem of insufficient lubrication cooling oil is more serious.

Referring to fig. 1, in some embodiments, the transmission hydraulic system includes a torque converter 7, a torque converter lockup valve 6, a transmission control valve group 4, a first hydraulic pump 31, a second hydraulic pump 32, and a lubrication cooling oil circuit. The torque converter 7 is provided with an oil inlet A, an oil outlet B and a lock control oil port C. The torque converter lock-up valve 6 is connected to the lock-up control port C to control whether the torque converter 7 is locked up. The gearbox control valve group 4 is used for controlling gearbox gear shifting and comprises a gearbox control oil port D. An oil outlet of the first hydraulic pump 31 is connected with an oil inlet A of the torque converter 7 to drive the torque converter 7 to act. The lubrication cooling oil passage is connected to an oil outlet of the first hydraulic pump 31 and a rotary member is provided in the lubrication cooling oil passage so that the oil flowing out of the first hydraulic pump 31 cools the rotary member. The second hydraulic pump 32 is connected with the transmission control port D of the transmission control valve group 4 and the torque converter locking valve 6 to control the actions of the transmission control valve group 4 and the torque converter locking valve 6.

The transmission hydraulic system of the embodiment of the invention is provided with two hydraulic pumps, namely a first hydraulic pump 31 and a second hydraulic pump 32 respectively, wherein oil flowing out of an oil outlet of the first hydraulic pump 31 is divided into two branches to flow out, one branch flows into a torque converter 7 as transmission working oil, the other branch flows into a lubricating and cooling flow path as lubricating and cooling oil to lubricate and cool a rotating member 9, the oil flowing out of an oil outlet of the second hydraulic pump 32 flows into a torque converter locking valve 6 and a gearbox control valve group 4 as control oil to control the actions of the torque converter locking valve 6 and the gearbox control valve group 4, so that the lubricating and cooling oil and the control oil are respectively provided by different hydraulic pumps, and the control oil used by the transmission hydraulic system for executing a gear shifting or locking process and the lubricating and cooling oil used for lubricating and cooling the rotating member 9 completely come from different oil sources, therefore, the problem of insufficient lubricating and cooling flow can be solved.

In some embodiments, the torque converter locking valve 6 is an electromagnetic on-off valve, and when the torque converter locking valve 6 is powered on, the oil path where the torque converter locking valve is located is opened, so that the oil output by the second hydraulic pump 32 can flow to the locking control port C through the oil path to realize locking control on the torque converter body 71. When the power is cut off, the torque converter locking valve 6 cuts off the oil path, so that the oil output by the second hydraulic pump 32 cannot flow to the locking control port C of the torque converter body 71, that is, when the locking operation of the torque converter body 71 is not required, the torque converter locking valve 6 can be controlled to be cut off.

The above rotary member 9 refers to a gear, a bearing, and the like, which are required in the power transmission process.

In some embodiments, the transmission hydraulic system further comprises a pressure regulating valve 11. The pressure regulating valve 11 is arranged between a gearbox control oil port D and an oil inlet A of the torque converter 7. The pressure regulating valve 11 is used to regulate the pressure of the control oil flowing out of the second hydraulic pump 31.

Specifically, the pressure regulating valve 11 may be a relief valve. In other embodiments, the pressure regulating valve may be a pressure reducing valve or the like.

In some embodiments, the transmission hydraulic system includes a first oil passage connecting the first hydraulic pump 31 and the oil inlet a of the torque converter 7, a second oil passage connecting the first oil passage and the transmission control port D, and the on-off valve 12 provided on the second oil passage. The on-off valve 12 controls on-off of the second oil path. When the on-off valve 12 controls the second oil path to be communicated, the oil output by the second hydraulic pump 32 and the oil output by the first hydraulic pump 31 can be converged and input to the oil inlet a of the torque converter 7 or flow to the lubricating and cooling oil path to lubricate the rotating member 9, so that when the gear shifting operation and the locking operation of the torque converter are not required, the oil output by the second hydraulic pump 32 can be converged to the torque converter 7 or the lubricating and cooling oil path 9, the oil output by the second hydraulic pump 32 is not required to be kept in a high-pressure state, and the energy consumption of the system is further effectively reduced.

In particular, the on-off valve 12 may be a solenoid on-off valve.

In some embodiments, the transmission hydraulic system further comprises a throttling element disposed on the lubricating cooling oil circuit upstream of the rotary member 9. The throttling element is used for adjusting the flow speed and the oil pressure of oil in the lubricating and cooling oil way.

Specifically, when the oil pressure of the lubricating and cooling oil path is smaller than the oil pressure at the oil inlet a of the torque converter 7, the oil output from the first hydraulic pump 31 and the second hydraulic pump 32 may merge into the lubricating and cooling oil path, and be used for lubricating and cooling the rotary member 9 together.

In some embodiments, the transmission control valve block 4 comprises at least two clutch control valves connected to the transmission control port D. The at least two clutch control valves are used for controlling the engagement of the at least two gear clutches. As shown in fig. 1, the transmission control oil port D is correspondingly connected to at least two clutch control valves through at least two branches, respectively. Fig. 1 shows, by way of example, that the transmission control valve block 4 comprises six clutch control valves. Each clutch control valve is an electromagnetic control valve and is switched on and off under the control of an electromagnetic control end.

In some embodiments, the transmission hydraulic system includes a double gear pump 3. The double gear pump 3 includes a first hydraulic pump 31 and a second hydraulic pump 32. This makes the entire transmission hydraulic system compact.

In some embodiments, the transmission hydraulic system further comprises a first oil tank 1 and a cooler 8. The first hydraulic pump 31 sucks oil from the first oil tank 1, and the cooler 8 is arranged between an oil outlet B of the torque converter and the first oil tank 1. Since the torque converter 7 converts the hydraulic energy into mechanical energy and the lost energy is converted into thermal energy, the temperature of the oil flowing out of the torque converter 7 increases. The cooler 8 is arranged between an oil outlet B of the torque converter and the first oil tank 1, so that the oil returns to the first oil tank 1 after being cooled by the cooler 8, and the lubricating and cooling functions of the first oil tank 1 are prevented from being influenced by the temperature rise of the oil in the first oil tank 1.

In some embodiments, the transmission hydraulic system further comprises a second oil tank 10. The second hydraulic pump 32 has two oil inlets. One of the two oil inlets draws oil from the second oil tank 10. That is, the first hydraulic pump 31 and the second hydraulic pump 32 may respectively suck oil from different oil tanks. For example, the first oil tank 1 is a torque converter oil pan, and the second oil tank 2 may be a common oil pan for a transmission and a drive axle, so that oil can be sucked respectively without being limited by the installation manner.

In other embodiments, the other of the two oil inlets of the second hydraulic pump 32 draws oil from the first oil tank 1 or from another oil tank. For example, the transmission hydraulic system further comprises a third oil tank, wherein the first oil tank 1 is a torque converter oil pan, the second oil tank 2 may be a transmission oil pan, and the third oil tank is a drive axle oil pan.

The structure of one embodiment of the transmission hydraulic system is described in detail below with reference to fig. 1.

In the present embodiment, the transmission hydraulic system includes a first oil tank 1, a coarse filter 2, a double gear pump 3, a transmission control valve group 4, a fine filter 5, a torque converter lock-up valve 6, a torque converter 7, a cooler 8, a rotary member 9, a second oil tank 10, a pressure regulating valve 11, and a cut-off valve 12.

The double gear pump 3 includes a first hydraulic pump 31 and a second hydraulic pump 32. The gearbox control valve group 4 comprises a first clutch control valve 41, a second clutch control valve 42, a third clutch control valve 43, a fourth clutch control valve 44, a fifth clutch control valve 45 and a sixth clutch control valve 46. Each clutch control valve 44 has a corresponding clutch control port (in operation, each clutch control port is in fluid communication with a corresponding clutch, in non-operation, the clutch control port is in communication with the oil tank, and in the non-operation state shown in the figure), and the torque converter 7 includes a torque converter body 71, an inlet relief valve 72, and a back pressure valve 73.

The specific working principle is as follows:

the first hydraulic pump 31 sucks oil from the first oil tank 1 through the coarse filter 2, and oil output by the first hydraulic pump 31 is divided into two paths: one path reaches the rotating part 9 to be lubricated and cooled, the other path enters the torque converter body 71 through the inlet safety valve 72, as the torque converter body 71 converts the hydraulic energy into mechanical energy, the lost energy is converted into heat energy, the oil temperature is increased, hot oil from the torque converter body 71 reaches the cooler 8 through the variable back pressure valve 73, and the oil cooled by the cooler 8 returns to the first oil tank 1. The second hydraulic pump 32 sucks oil from the first oil tank 1 and the second oil tank 10, the output oil enters the gearbox control valve group 4 after being subjected to fine filtration 5, when the on-off valve 12 is not electrified, pressure regulation is carried out through the pressure regulating valve 11, and the oil after pressure regulation simultaneously enters the gearbox control valve group 4 or the torque converter locking valve 6. When the gear operation of the gearbox needs to be executed, at the moment, any one or any two clutch control valves in the gearbox control valve group 4 are electrified, and oil enters the clutch through the clutch control valves to be engaged in the gears. When the torque converter needs to be locked, the torque converter locking valve 6 is electrified, the oil enters the torque converter body 71 through the torque converter locking valve 6, and the torque converter body 71 is in a locking state. When the shift position operation or the lock operation is not performed, the on-off valve 12 is energized, and the oil sucked by the second hydraulic pump 32 and the oil sucked by the first hydraulic pump 31 are merged at this time. Because of the duplicate gear pump 3 has three oil suction ports, the three oil suction ports can respectively suck oil from the torque converter oil pan, the gearbox oil pan and the drive axle oil pan, and can also be respectively combined as required, namely the first oil tank 1 is a common oil tank for the gearbox oil pan and the drive axle oil pan.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.