External shell oil supplementing overflow valve assembly of HST assembly

Abstract

The utility model relates to an external shell oil supplement overflow valve assembly of an HST assembly, which comprises a mounting seat and a valve core, the bottom of the mounting seat is provided with a mounting groove used for mounting the valve core, the valve core is inversely inserted on the mounting seat, and the mounting groove is provided with an oil inlet and an oil outlet. The valve element comprises a working cylinder, a connecting block arranged at one end of the working cylinder and a movable column arranged on the other side of the connecting block, the movable column is sleeved with a spring, an oil spilling channel is formed in the bottom of the working cylinder, and an oil spilling hole communicated with the oil spilling channel is formed in the working cylinder. According to the utility model, the structure is simple, the components can be purchased in bulk, the mechanical seal of the low-cost valve core is changed into a surface seal structure by reducing the processing procedures of the rear cover, compared with a sealing mechanism with a conical core and a conical hole, the sealing performance is better, and the oil supplementing overflow valve is arranged in the shell, so that the oil leakage risk is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of continuously variable transmission (CVT) technology and relates to an external housing oil overflow valve assembly for an HST assembly. Background Technology

[0002] In the agricultural machinery market, the housing oil replenishment relief valve assembly of HST hydraulic continuously variable transmissions is mostly embedded in the side of the rear cover. It branches in the oil inlet pipeline to replenish the housing oil for hydraulic circulation, lubrication, and heat dissipation. Therefore, the housing oil replenishment relief valve is a necessary hydraulic oil control device.

[0003] The HST hydraulic continuously variable transmission (CVT) assemblies commonly used in the domestic agricultural machinery market currently employ cartridge-type relief valves mounted on the outer side of the rear cover. While this facilitates disassembly and assembly, it requires pre-cast oil passages in the cast rear cover, increasing casting complexity. Even with a fully machined solution, ensuring the dimensional accuracy of the valve core hole, O-ring seal mounting groove, and threaded hole increases machining costs. The main disadvantages of cartridge valves are: 1. The plug requires an O-ring seal to prevent hydraulic oil leakage from the pipeline. O-ring seals are easily damaged during installation and maintenance, increasing the risk of oil leakage in the HST hydraulic CVT assembly; 2. Cartridge valve components must be procured as a whole. Hydraulic testing of the valve body assembly requires component performance testing. Purchasing cartridge valve components piecemeal makes it difficult to guarantee quality, resulting in higher costs. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing an external housing-type oil replenishment overflow valve assembly for the HST assembly.

[0005] The objective of this utility model can be achieved through the following technical solution: an external housing oil overflow valve assembly for an HST assembly, comprising a mounting base and a valve core, wherein the bottom of the mounting base is provided with a mounting groove for mounting the valve core, the valve core is inserted upside down into the mounting base, the valve core comprises a working cylinder, a connecting block disposed at one end of the working cylinder, and a movable column disposed on the other side of the connecting block, a spring is sleeved on the movable column, an overflow channel is provided at the bottom of the working cylinder, and an overflow hole communicating with the overflow channel is provided on the upper part of the working cylinder.

[0006] In the external housing oil replenishment overflow valve assembly of the aforementioned HST assembly, the connecting block matches the mounting groove.

[0007] In the aforementioned external housing oil replenishment overflow valve assembly of an HST assembly, fixing bolts are provided on both sides of the mounting base, and the mounting base is fixed to the HST assembly by the fixing bolts.

[0008] In the external housing oil overflow valve assembly of the above-mentioned HST assembly, the mounting base has a movable hole that communicates with the mounting groove, and one end of the movable column is located in the movable hole.

[0009] Compared with the prior art, this utility model has a simple structure and the components can be purchased in bulk. By reducing the processing steps of the back cover, the cost is reduced again. The mechanical seal of the valve core is a surface seal structure, which has better sealing performance than the sealing mechanism of conical core and conical hole. The oil replenishment overflow valve is installed inside the housing, eliminating the risk of oil leakage. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model;

[0011] Figure 2 This is a side view of the present invention;

[0012] Figure 3 This is a schematic diagram of the valve core structure of this utility model;

[0013] Figure 4 This is a schematic diagram of the HST assembly structure;

[0014] Figure 5 This is a schematic diagram of the lower housing of the HST assembly;

[0015] Figure 6 This is an installation diagram of this utility model.

[0016] In the diagram, 1. Mounting base; 2. Valve core; 21. Working cylinder; 22. Connecting block; 23. Movable column; 3. Spring; 4. Overflow channel; 5. Overflow hole; 6. Mounting groove; 7. Fixing bolt; 8. Movable hole; 9. HST assembly; 10. Mounting hole; 11. Oil filler port; 12. Bolt fixing hole. Detailed Implementation

[0017] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments. Example

[0018] like Figures 1 to 3As shown, an external housing oil overflow valve assembly for an HST assembly includes a mounting base 1 and a valve core 2. The valve core 2 is made of high-quality low-carbon alloy steel and is heat-treated by carbonitriding. The bottom of the mounting base 1 has a mounting groove 6 for mounting the valve core 2. The valve core 2 is inserted upside down into the mounting base 1. The valve core 2 includes a working cylinder 21, a connecting block 22 at one end of the working cylinder 21, and a movable column 23 on the other side of the connecting block 22. A spring 3 is sleeved on the movable column 23. An oil overflow channel 4 is provided at the bottom of the working cylinder 21, and an oil overflow hole 5 communicating with the oil overflow channel 4 is provided on the upper part of the working cylinder 21. The oil overflow hole 5 horizontally penetrates the working cylinder 21.

[0019] Furthermore, the connecting block 22 is matched with the mounting groove 6.

[0020] Furthermore, fixing bolts 7 are provided on both sides of the mounting base 1, and the mounting base 1 is fixed to the HST assembly 9 by the fixing bolts 7.

[0021] Furthermore, the mounting base 1 has a movable hole 8 that communicates with the mounting groove 6, and one end of the movable column 23 is located inside the movable hole 8.

[0022] like Figure 4 and Figure 6 As shown, it also includes HST assembly 9. The lower housing of HST assembly 9 has an oil filling hole 11 on its side and a mounting hole 10 on its top. When the oil filling overflow valve assembly is installed on HST assembly 9, the working cylinder 21 of valve core 2 is inserted into the mounting hole 10, and the overflow hole 5 is located in the mounting hole. The mounting seat 1 is fixed to HST assembly 9 by fixing bolts 7 on both sides. When the pressure in the oil filling hole reaches 5-7 bar, the oil filling overflow valve assembly is in the open state. The oil pressure pushes valve core 2 to move upward, and spring 3 is compressed, so that the overflow hole 5 on valve core 2 moves upward to the outside of mounting hole 10. At this time, the oil mist in the oil filling hole 11 can flow from the overflow hole 5 into the cavity of HST assembly 9 to lubricate the components in HST assembly.

[0023] This utility model has a simple structure, and the components can be purchased in bulk. By reducing the processing steps of the back cover, the cost is reduced again. The mechanical seal of the valve core 2 is a surface seal structure, which has better sealing performance compared with the sealing mechanism of the cone core and cone hole. The oil replenishment overflow valve is installed inside the housing, eliminating the risk of oil leakage.

[0024] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An external housing-type oil replenishment relief valve assembly for an HST assembly, characterized in that, The device includes a mounting base (1) and a valve core (2). The bottom of the mounting base (1) is provided with a mounting groove (6) for mounting the valve core (2). The valve core (2) is inserted upside down into the mounting base (1). The valve core (2) includes a working cylinder (21), a connecting block (22) provided at one end of the working cylinder (21), and a movable column (23) provided on the other side of the connecting block (22). A spring (3) is sleeved on the movable column (23). An oil overflow channel (4) is provided at the bottom of the working cylinder (21), and an oil overflow hole (5) connected to the oil overflow channel (4) is provided on the upper part of the working cylinder (21).

2. The external housing-type oil overflow valve assembly for an HST assembly according to claim 1, characterized in that: The connecting block (22) is matched with the mounting slot (6).

3. The external housing-type oil overflow valve assembly for an HST assembly according to claim 2, characterized in that: The mounting base (1) is provided with fixing bolts (7) on both sides, and the mounting base (1) is fixed to the HST assembly (9) by fixing bolts (7).

4. The external housing-type oil overflow valve assembly for an HST assembly according to claim 3, characterized in that: The mounting base (1) is provided with a movable hole (8) that communicates with the mounting groove (6), and one end of the movable column (23) is located in the movable hole (8).

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