Valve arrangement of a control valve unit

Abstract

The present application provides a valve arrangement of a control valve unit, which improves oil pressure responsivity and oil pressure stability of a pressure regulating valve that takes line pressure as initial pressure. The valve arrangement of the control valve unit has a control valve body that supplies oil from a main pump. The valve arrangement has a pressure regulating valve that is arranged in the control valve body and regulates discharge oil of the main pump to line pressure, a pressure regulating valve that is arranged in the control valve body and regulates oil to required pressure with line pressure as initial pressure, and a first oil passage that is provided in the control valve body and links the main pump and the pressure regulating valve, the pressure regulating valve being arranged in a second oil passage that branches from the first oil passage.

Description

Technical Field

[0001] This invention relates to a valve configuration structure for a control valve unit. Background Technology

[0002] In patent document 1 Figure 2 A hydraulic circuit diagram showing the general layout of the control valve unit of a continuously variable transmission (CVT) has been disclosed. In Patent Document 1, as shown... Figure 1 , Figure 2 As shown, the pump pressure discharged from the oil pump (3) driven by the engine (1) is discharged into the oil circuit (401) and regulated to the line pressure by the pressure regulating valve (21). Then, the line pressure is introduced into the primary regulating valve (26), the secondary regulating valve (27), and the pilot valve (25), which use the line pressure as the initial pressure.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: International Publication No. 2016 / 006356 Summary of the Invention

[0006] The technical problem that the invention aims to solve

[0007] In patent document 1 Figure 2 The hydraulic circuit diagram shows that the primary regulating valve (26), the secondary regulating valve (27), and the pilot valve (25) are configured on the oil line branching off from the oil line of the connecting pump (3) and the pressure regulating valve (21).

[0008] However, Patent Document 1 Figure 2 The hydraulic circuit diagram provides an easy-to-understand schematic representation of the general layout of the control valve unit, i.e., the hydraulic circuit, without disclosing the actual valve configuration of the pressure regulating valve installed within the control valve body.

[0009] In contrast, when describing the actual configuration of the pressure regulating valve arranged in the control valve body, taking Patent Document 1 as an example, all or part of the primary regulating valve (26), secondary regulating valve (27), and pilot valve (25) are arranged in the oil circuit connecting the pump (3) and the pressure regulating valve (21) due to space limitations.

[0010] However, the pressure regulating valve (21) will discharge a portion of the oil supplied by the pump (3) and regulate the oil pressure to the pipeline pressure. Therefore, an oil flow will occur in the oil line connecting the pump (3) and the pressure regulating valve (21).

[0011] Therefore, in this case, the pressure regulating valve configured in the oil circuit connecting the pump (3) and the pressure regulating valve (21) is affected by the oil flow, and the sliding resistance of the valve core of the pressure regulating valve increases. Moreover, when the sliding resistance of the valve core increases, it affects the movement of the valve core, thus causing oil pressure vibration in the pressure regulating valve, that is, repeated up and down changes in oil pressure. As a result, it may affect the oil pressure responsiveness and oil pressure stability of the pressure regulating valve.

[0012] The present invention was made in view of the above-mentioned problems, and aims to improve the oil pressure response and oil pressure stability of pressure regulating valves that use pipeline pressure as initial pressure.

[0013] Technical solutions for solving technical problems

[0014] The valve configuration structure of a control valve unit according to a certain aspect of the present invention is a valve configuration structure of a control valve unit having a control valve body that supplies oil from a main pump, comprising: a pressure regulating valve disposed in the control valve body and regulating the pressure of the discharged oil from the main pump to the pipeline pressure; a pressure regulating valve disposed in the control valve body and regulating the oil pressure to the required pressure by using the pipeline pressure as the initial pressure; and a first oil passage disposed in the control valve body and connecting the main pump and the pressure regulating valve, wherein the pressure regulating valve is configured in a second oil passage branching from the first oil passage.

[0015] The effects of the invention

[0016] According to the above method, since the pressure regulating valve is configured outside the oil flow of the first oil circuit, the oil pressure responsiveness and oil pressure stability of the pressure regulating valve that uses the pipeline pressure as the initial pressure can be improved. Attached Figure Description

[0017] Figure 1 This is a diagram illustrating an example of the actual state of a pipeline pressure oil circuit.

[0018] Figure 2 This is a structural overview diagram of the valve configuration structure of the control valve unit.

[0019] Figure 3 It is a diagram that uses a partially cut model of the control valve body to represent the valve core.

[0020] Figure 4 This is an external view of an existing example of a control valve.

[0021] Figure 5 This is a diagram showing a modified example of the valve configuration structure of a control valve unit. Detailed Implementation

[0022] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0023] Figure 1This is a diagram illustrating an example of the actual state of the oil pressure circuit L in the pipeline. Figure 2 This is a structural overview diagram of the valve configuration structure of control valve unit 1. Figure 3 This diagram uses a partially cut model of the control valve body 2 to represent the valve core 41 of the pressure regulating valve 4. Figure 1 In the diagram, the control valve body 2, which forms the pipeline pressure oil circuit L, is schematically represented by two dashed lines, and the valve core 41 and other valve cores are also schematically represented by dashed lines. Figure 2 In order to conform Figure 1 The valve configuration shown in the diagram represents the actual state of the oil pressure circuit L, indicating the valve configuration structure of the control valve unit 1.

[0024] Control valve unit 1 is applied to a transmission. The transmission is, for example, a belt-driven continuously variable transmission (CVT). Control valve unit 1 includes: a control valve body 2, a partition 3, a pressure regulating valve 4, a primary pulley pressure control valve 5, a secondary pulley pressure control valve 6, and a pilot valve 7.

[0025] The control valve body 2 has a structure comprising a first body 2a and a second body 2b, with a partition 3 provided between the first body 2a and the second body 2b. The control valve body 2 can also be understood as having a structure that also includes the partition 3. In the control valve body 2, the first body 2a and the second body 2b constitute multiple laminated body parts, which are adjacent to each other in the lamination direction.

[0026] The partition 3 serves as a partition wall between the first main body 2a and the second main body 2b. The oil pipeline L consists of oil grooves formed on the opposing surfaces of the first main body 2a and the second main body 2b, and oil holes provided on the partition 3 and respectively connecting the oil grooves of the first main body 2a and the second main body 2b.

[0027] As indicated by arrow IN, oil is supplied to the control valve body 2 from the mechanical oil pump 11 via the check valve 12. The mechanical oil pump 11 is a pump driven by the engine 10 and is equivalent to the main pump. The control valve body 2 may also be a structure in which an electric oil pump is used as the main pump to supply oil. In this embodiment, instead of multiple pumps, a single mechanical oil pump 11 is used to supply oil to the control valve body 2; in this case, it can be understood that this single pump is the main pump. The check valve 12 allows oil flow from the mechanical oil pump 11 towards the control valve body 2 and prevents oil flow in the opposite direction.

[0028] The control valve body 2 is equipped with a pressure regulating valve 4, a primary pulley pressure control valve 5, a secondary pulley pressure control valve 6, and a pilot valve 7. In this example, the pressure regulating valve 4 and the pilot valve 7 are located in the first body 2a, and the primary pulley pressure control valve 5 and the secondary pulley pressure control valve 6 are located in the second body 2b.

[0029] Pressure regulating valve 4 adjusts the pressure of the oil discharged from mechanical oil pump 11 to the pipeline pressure. Pressure regulating valve 4 discharges a portion of the oil supplied from mechanical oil pump 11 and adjusts the oil pressure to the pipeline pressure. Therefore, an oil flow as indicated by arrow F is generated in the first oil passage L1 connecting mechanical oil pump 11 and pressure regulating valve 4 within the control valve body 2.

[0030] The first oil passage L1 is part of the pipeline pressure oil passage L installed within the control valve body 2. In addition to the first oil passage L1, the pipeline pressure oil passage L also has a second oil passage L2 branching off from the first oil passage L1. Figure 2 In the diagram, the thick line portion of the oil pressure line L represents the first oil line L1, and the thin line portion represents the second oil line L2. The second oil line L2, which branches off from the first oil line L1, includes multiple oil lines branching off from the first oil line L1, and also includes oil lines that further branch off from the first oil line L1.

[0031] The primary pulley pressure control valve 5, the secondary pulley pressure control valve 6, and the pilot valve 7 each constitute a pressure regulating valve that uses the pipeline pressure as the initial pressure to adjust the oil pressure to the required pressure. Oil is supplied from the primary pulley pressure control valve 5 to the primary pulley of the belt-driven continuously variable transmission (CVT), and oil is supplied from the secondary pulley pressure control valve 6 to the secondary pulley of the CVT. Oil is supplied from the pilot valve 7 to linear solenoid valves, for example, those generating signal pressures from the pressure regulating valve 4, the primary pulley pressure control valve 5, and the secondary pulley pressure control valve 6.

[0032] Under the control of the controller, the linear solenoid valve generates a signal pressure corresponding to the required pressure. The pressure regulating valve 4, primary pulley pressure control valve 5, and secondary pulley pressure control valve 6 each adjust the oil pressure to the required pressure based on the signal pressure generated by their respective linear solenoid valves. The primary pulley pressure control valve 5, secondary pulley pressure control valve 6, and pilot valve 7 are each pressure reducing valves; pilot valve 7 ensures the oil operates at the preset required pressure. The primary pulley pressure control valve 5 and secondary pulley pressure control valve 6 constitute the pulley pressure control valves of the belt-driven continuously variable transmission (CVT).

[0033] Pressure regulating valve 4 has the function of Figure 1 Valve core 41 is indicated by a dashed line. Similarly, the primary pulley pressure control valve 5, the secondary pulley pressure control valve 6, and the pilot valve 7 each have valve core 51, valve core 61, and valve core 71, respectively.

[0034] like Figure 3 As shown, the valve core 41 is disposed within the control valve body 2. The pressure regulating valve 4 is constructed by having the valve core 41 disposed in this manner, and a sleeve 42 formed by a portion of the control valve body 2, through which the valve core 41 slides. The pressure regulating valve 4 thus constructed has a structure disposed within the control valve body 2. The primary pulley pressure control valve 5, the secondary pulley pressure control valve 6, and the pilot valve 7 are also constructed in the same manner as the pressure regulating valve 4.

[0035] like Figure 1 As shown, valve cores 41, 51, 61, and 71 exist in the oil pressure passage L of the pipeline. The annular oil passage formed around valve core 41 corresponds to the oil inlet port formed in sleeve 42. The same applies to valve cores 51, 61, and 71.

[0036] Based on the actual state of the oil pressure line L in the pipeline. Figure 1 And a description that conforms to the actual state of the pipeline pressure oil circuit L. Figure 2 It can be seen that the primary pulley pressure control valve 5, the secondary pulley pressure control valve 6, and the pilot valve 7 are each configured in the second oil circuit L2.

[0037] In other words, the aforementioned pressure regulating valve uses the first oil circuit L1 as the main oil circuit and the second oil circuit L2 as a branch oil circuit, i.e., it is configured as a branch. Therefore, the aforementioned pressure regulating valve is configured outside the oil flow indicated by arrow F. It should be noted that, based on the branching of the oil circuit in the pipeline pressure oil circuit L depicted in actual condition, it can be seen that... Figure 1 The second oil passage L2, represented by the marker, is modeled as a line diagram and depicted in its actual state.

[0038] Next, the main effects of this embodiment will be explained.

[0039] Figure 4 This is an external view of the control valve unit 1X as a comparative example. The control valve unit 1X has a control valve body 2X. The control valve body 2X has a structure corresponding to a valve configuration different from that of this embodiment, and in this example, it is composed of three main parts. Therefore, in this example, a partition 3 is provided between each of the three main parts that are adjacent to each other in the lamination direction.

[0040] Solenoid valve 43 is a linear solenoid valve that supplies signal pressure to pressure regulating valve 4. Similarly, solenoid valve 53 is a linear solenoid valve that supplies signal pressure to primary pulley pressure control valve 5, and solenoid valve 63 is a linear solenoid valve that supplies signal pressure to secondary pulley pressure control valve 6.

[0041] In this example, solenoid valves 43, 53, and 63 are each configured in conjunction with the corresponding pressure regulating valve within the control valve body 2X. That is, in this example, the valve configuration is as follows: along the arrow F representing the oil flow in the first oil passage L1, from the upstream side, a primary pulley pressure control valve 5, a secondary pulley pressure control valve 6, and a pressure regulating valve 4 are sequentially arranged.

[0042] Therefore, in this example, the valve core 51 of the primary pulley pressure control valve 5 and the valve core 61 of the secondary pulley pressure control valve 6 are each affected by the oil flow indicated by arrow F. As a result, the sliding resistance of valve cores 51 and 61 increases, thus generating oil pressure vibration in the aforementioned pressure regulating valves. Consequently, this can lead to a situation that affects the oil pressure responsiveness and oil pressure stability of the aforementioned pressure regulating valves.

[0043] like Figure 1 , Figure 2 As shown, the valve configuration structure of the control valve unit 1 in this embodiment includes a control valve body 2 that supplies oil from the mechanical oil pump 11. This valve configuration structure includes: a pressure regulating valve 4 disposed within the control valve body 2 that regulates the pressure of the oil discharged from the mechanical oil pump 11 to the pipeline pressure; a primary pulley pressure control valve 5 disposed within the control valve body 2 that uses the pipeline pressure as an initial pressure to regulate the oil pressure to the desired pressure; a secondary pulley pressure control valve 6 and a pilot valve 7; and a first oil passage L1 disposed within the control valve body 2 and connecting the mechanical oil pump 11 and the pressure regulating valve 4. In this valve configuration structure, the primary pulley pressure control valve 5, the secondary pulley pressure control valve 6, and the pilot valve 7 are configured in a second oil passage L2 branching off from the first oil passage L1.

[0044] (1) According to this structure, the primary pulley pressure control valve 5, the secondary pulley pressure control valve 6, and the pilot valve 7 are configured outside the oil flow of the first oil circuit L1 indicated by arrow F. Therefore, the oil pressure responsiveness and oil pressure stability of the primary pulley pressure control valve 5, the secondary pulley pressure control valve 6, and the pilot valve 7, which use the pipeline pressure as the initial pressure, can be improved.

[0045] The valve configuration structure of control valve unit 1 can also be configured as follows.

[0046] Figure 5 This is a diagram showing a modified example of the valve configuration structure of control valve unit 1. In Figure 5 In the diagram, the valve configuration of pressure regulating valve 4, primary pulley pressure control valve 5, secondary pulley pressure control valve 6, and pilot valve 7 is shown to conform to the actual state.

[0047] In this example, in addition to the mechanical oil pump 11, oil is also supplied to the control valve body 2 from an electric oil pump 21 driven by an electric motor 20. The electric oil pump 21 supplies oil to the control valve body 2 via a check valve 22. The check valve 22 allows oil flow from the electric oil pump 21 towards the control valve body 2 and prevents oil flow in the opposite direction.

[0048] The electric oil pump 21 is connected to the primary pulley pressure control valve 5, the secondary pulley pressure control valve 6, and the pilot valve 7, which function as pressure regulating valves, via the second oil circuit L2 instead of the first oil circuit L1. In other words, the electric oil pump 21 is a so-called branch configuration. The electric oil pump 21 is used as an auxiliary pump to the mechanical oil pump 11, essentially functioning as an auxiliary pump.

[0049] (2) Based on this structure, compared to the case where the electric oil pump 21 is arranged in parallel with the mechanical oil pump 11 and supplies oil to the pressure regulating valve via the first oil passage L1, the electric oil pump 21 can quickly supply oil to the pressure regulating valve that requires oil. Therefore, the oil pressure responsiveness and oil pressure stability of pressure regulating valves such as the primary pulley pressure control valve 5, which uses the pipeline pressure as the initial pressure, can be further improved. In addition, in this case, by arranging the electric oil pump 21 as a branch, the pressure regulating valves such as the primary pulley pressure control valve 5 can be arranged away from the pressure regulating valve 4. Therefore, the spatial constraints of arranging the pressure regulating valve can be alleviated, and the layout of the valve arrangement is also improved.

[0050] The electric oil pump 21 is configured close to the primary pulley pressure control valve 5, which is an example of a pulley pressure control valve. In other words, the primary pulley pressure control valve 5 is a pressure regulating valve configured closest to the electric oil pump 21 in the second oil circuit L2.

[0051] (3) According to such a structure, oil can be quickly supplied by the electric oil pump 21 to the actuator of the primary pulley, which is an example of a pulley and is very important for the oil supply in the belt continuously variable transmission. It is also preferred from the perspective of the pressure loss of the oil supplied by the electric oil pump 21.

[0052] The embodiments of the present invention have been described above, but the above embodiments are only a part of the application examples of the present invention and are not intended to limit the technical scope of the present invention to the specific structure of the above embodiments.

[0053] Explanation of reference numerals in the attached figures

[0054] 1. Control valve unit; 1X control valve unit; 2. Control valve body; 2X control valve body; 4. Pressure regulating valve; 41. Valve core; 5. Primary wheel pressure control valve (pressure regulating valve, wheel pressure control valve); 51. Valve core; 6. Secondary wheel pressure control valve (pressure regulating valve, wheel pressure control valve); 61. Valve core; 7. Pilot valve (pressure regulating valve); 71. Valve core; 11. Mechanical oil pump; 21. Electric oil pump; L1. First oil circuit; L2. Second oil circuit

Claims

1. A valve configuration structure for a control valve unit, the control valve unit having a control valve body that supplies oil from a main pump, the valve configuration structure of the control valve unit being characterized by having: A pressure regulating valve, which is disposed within the control valve body, regulates the pressure of the oil discharged from the main pump to the pipeline pressure; A pressure regulating valve, which is disposed within the control valve body, adjusts the oil pressure to the required pressure by using the pipeline pressure as the initial pressure; The first oil circuit is located inside the control valve body and connects the main pump to the pressure regulating valve; The pressure regulating valve is configured in a second oil circuit branching off from the first oil circuit. Oil is also supplied to the control valve body from an auxiliary pump, which is driven by a different drive source than the main pump. The auxiliary pump is connected to the pressure regulating valve via the second oil circuit instead of the first oil circuit, with the first oil circuit being configured as the main oil circuit and the second oil circuit as a tributary flow path. The pressure regulating valve is configured on the second oil line in the interval between the branch point of the second oil line from the first oil line and the auxiliary pump.

2. The valve configuration structure of the control valve unit as described in claim 1, characterized in that, The pressure regulating valve includes a belt pulley pressure control valve for a belt-driven continuously variable transmission. The auxiliary pump is located close to the belt pressure control valve.

3. The valve configuration structure of the control valve unit as described in claim 2, characterized in that, The pulley pressure control valve includes a primary pulley pressure control valve. The primary pulley pressure control valve is the pressure regulating valve, and it is configured in the second oil circuit closest to the auxiliary pump.

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