Hydraulic transmission stepless speed change drive axle

Abstract

The utility model particularly relates to a hydraulic transmission stepless speed change drive axle. Comprising a shell, a transmission gear set, a hydraulic pump and a hydraulic motor are arranged in the shell, and a hydraulic base is arranged between the hydraulic pump and the hydraulic motor; the hydraulic base comprises a base body, and the base body is provided with a hydraulic flow channel, a hydraulic pump connecting end and a hydraulic motor connecting end; the hydraulic runner comprises a hydraulic pump port, a hydraulic motor port and a channel for communicating the hydraulic pump port and the hydraulic motor port, and the channel is a round channel which is formed by drilling and has a smooth and straight inner wall; the hydraulic pump port is located at the hydraulic pump connecting end, and the hydraulic motor port is located at the hydraulic motor connecting end. According to the scheme, the hydraulic transmission stepless speed change drive axle has the advantages of being easy to manufacture, small in flowing resistance of hydraulic fluid, high in output rotating speed torque, stable in performance and longer in service life.

Description

Technical Field

[0001] This utility model specifically relates to a hydraulic transmission continuously variable transmission drive axle. Background Technology

[0002] A hydraulic drive axle is a bridging device driven by a hydraulic transmission system. In a hydraulic drive axle, a hydraulic pump provides pressurized oil, which is regulated in flow and direction by a control valve, thus driving a hydraulic motor. Its efficiency is clearly related to the pressurized oil flow rate. The hydraulic base is located between the hydraulic pump and the hydraulic motor. Existing hydraulic bases are manufactured using aluminum alloy, with the internal liquid flow channels produced through casting. Because the channels for liquid flow are curved and require high precision, existing hydraulic bases typically employ lost foam casting. The casting process in lost foam casting is a crucial and highly demanding step in the entire process. Hydraulic bases manufactured using this material and casting process, such as… Figure 5 As shown, the main disadvantages are as follows: 1) The fluid flow channel is curved, making manufacturing relatively difficult and resulting in a high scrap rate. 2) The curved and rough fluid flow channel increases the flow resistance of the hydraulic fluid, reducing system efficiency. 3) Aluminum alloy has low hardness and is not wear-resistant, affecting the reliability and service life of the system. 4) The fluid flow channel in the existing technology is narrow, further increasing the flow resistance of the hydraulic fluid. Utility Model Content

[0003] The present invention aims to provide a hydraulic transmission continuously variable transmission drive axle, which has the advantages of simple manufacturing, low flow resistance of hydraulic fluid, high output speed and torque, stable performance and longer service life.

[0004] The hydraulic continuously variable transmission (CVT) drive axle in this solution includes a housing, within which a transmission gear set, a hydraulic pump, and a hydraulic motor are housed. A hydraulic base is provided between the hydraulic pump and the hydraulic motor. The hydraulic base has a hydraulic pump connection end and a hydraulic motor connection end, and a hydraulic flow channel is provided within the hydraulic base. The hydraulic flow channel includes a hydraulic pump port and a hydraulic motor port, as well as a channel connecting the two. The hydraulic pump port is located at the hydraulic pump connection end, and the hydraulic motor port is located at the hydraulic motor connection end. This channel is a circular channel with a smooth and straight inner wall, formed by drilling, resulting in low flow resistance; at the same time, it shortens the channel length and improves the transmission efficiency of the system.

[0005] Furthermore, the hydraulic flow channel has two independent channels.

[0006] Furthermore, the bottom of the first hydraulic pump port is inclined to one side, and there are two hydraulic motor ports with different depths; the bottom of the hydraulic pump port is inclined to one side, and the channel passes through the side wall of the hydraulic pump port and connects to the bottom of the corresponding hydraulic motor port. This spatial misalignment ensures that the two channels do not interfere with each other; and the hydraulic pump port and hydraulic motor port on two mutually perpendicular planes can be connected through only a straight channel.

[0007] Furthermore, the base body is made of wear-resistant material. Specific wear-resistant materials may include ductile iron, alloy steel, etc.

[0008] Furthermore, the end face of the hydraulic motor connection extends beyond the side wall of the hydraulic pump port, resulting in a larger cross-sectional area for the drilling channel.

[0009] The advantages of this invention are: 1) The cross-section of the channel is formed by drilling, which is not only simple to manufacture but also results in a smooth inner wall. 2) When liquid flows through the channel, the channel is short and the flow resistance is low, thereby improving system efficiency. 3) Since the channel can be machined using an easy-to-process drilling process, a wider range of materials can be selected for the base body, preferably wear-resistant materials such as ductile iron and alloy steel, which significantly improves its reliability and service life. 4) The bottoms of the hydraulic pump port and the hydraulic motor port are inclined in a specific direction, utilizing spatial misalignment, allowing the hydraulic pump port and the hydraulic motor port on two mutually perpendicular planes to be connected through only a straight channel. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the hydraulic transmission continuously variable transmission drive axle of this utility model;

[0011] Figure 2 This is a perspective view of the hydraulic base in the hydraulic transmission continuously variable transmission drive axle of this utility model.

[0012] Figure 3 This is a schematic diagram of the hydraulic base in the hydraulic transmission continuously variable transmission drive axle of this utility model;

[0013] Figure 4 This is a schematic diagram of the hydraulic base in the hydraulic transmission continuously variable transmission drive axle of this utility model.

[0014] Figure 5 This is a structural diagram of the hydraulic base in the hydraulic transmission continuously variable transmission drive axle of this utility model;

[0015] Figure 6 This is a structural diagram of a hydraulic base in the prior art.

[0016] In the diagram, 1 is the hydraulic base, 2 is the hydraulic pump connection end, 2a is the first hydraulic pump port, 2b is the second hydraulic pump port, 3 is the hydraulic motor connection end, 3a is the first hydraulic motor port, 3a-1 is the bottom of the first hydraulic motor port, 3b is the second hydraulic motor port, 3b-1 is the bottom of the second hydraulic motor port, 4-1 is the first channel, 4-2 is the second channel, 4-3 is the machining port, 5 is the positioning pin, 6 is the housing, 7 is the hydraulic pump, 8 is the hydraulic motor, 9 is the transmission gear set, 02 is the hydraulic pump port, 03 is the hydraulic motor port, and 04 is the curved channel. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0018] according to Figures 1 to 4 As shown, the hydraulic continuously variable transmission (CVT) drive axle in this scheme includes a housing 6, and a transmission gear set, a hydraulic pump 7, and a hydraulic motor 8 disposed within the housing 6. A hydraulic base 1 is provided between the hydraulic pump 7 and the hydraulic motor 8. The hydraulic base 1 has a hydraulic pump connection end 2 and a hydraulic motor connection end 3, and a hydraulic flow channel is provided inside the hydraulic base 1. Hydraulic fluid enters the hydraulic base through the hydraulic pump 7, and is then converted into mechanical energy by the hydraulic motor 8. The hydraulic flow channel includes the port of the hydraulic pump 7 and the port of the hydraulic motor, as well as a channel connecting the two. This channel is a circular channel with a smooth and straight inner wall formed by drilling. The port of the hydraulic pump 7 is located at the hydraulic pump connection end 2, and the port of the hydraulic motor is located at the hydraulic motor connection end 3. The machined openings 4-3 of the channel can be sealed with a sealing component (such as a plunger).

[0019] As a further improvement to this plan, based on Figure 3 , 4As shown, the hydraulic flow channel includes a first hydraulic flow channel and a second hydraulic flow channel. The first hydraulic flow channel includes a first hydraulic pump port 2a, a first hydraulic motor port 3a, and a first channel 4-1. The bottom 3a-1 of the first hydraulic motor port is inclined to one side, and the first channel 4-1 passes through the side wall of the first hydraulic pump port 2a and communicates with the bottom 3a-1 of the first hydraulic motor port. The second hydraulic flow channel includes a second hydraulic pump port 2b, a second hydraulic motor port 3b, and a second channel 4-2. The bottom 3b-1 of the second hydraulic motor port is inclined to one side, and the second channel 4-2 passes through the side wall of the second hydraulic pump port 2b and communicates with the bottom 3b-1 of the second hydraulic motor port. The depth of the first hydraulic pump port 2a is greater than that of the second hydraulic pump port 2b. By utilizing spatial misalignment, the hydraulic pump port 7 and the hydraulic motor port, located on two mutually perpendicular planes, are connected by only a straight channel, while ensuring that the first channel 4-1 and the second channel 4-2 do not interfere with each other. This not only shortens the length of the channel but also makes the inner wall of the channel smooth. Preferably, the machining openings 4-3 of the two channels are located on the same end face of the hydraulic base 1.

[0020] As a further improvement to this plan, based on Figure 5 As shown, the end face of the hydraulic motor connection end 3 extends beyond the side wall of the first hydraulic pump port 2a, resulting in a larger cross-sectional area for the drilling channel. A locating pin 5 is also integrally provided on the base body 1, preferably a hollow structure. The base body 1 is made of wear-resistant material. Specific wear-resistant materials may include ductile iron, alloy steel, etc.

[0021] Figure 6 The diagram shows a prior art hydraulic base. The curved channel 04 (shown as a dotted line in the diagram) between the hydraulic pump port 02 and the hydraulic motor port 03 is excessively long due to its curvature. Furthermore, due to limited internal space, a section of the curved channel 04 has a small cross-section, severely affecting the liquid flow rate. The rapid change in the liquid flow area of ​​the curved channel 04 also affects the liquid flow rate. In this invention, the liquid flows through the channel as follows... Figure 3 As shown, the dashed lines in the sectional view AA represent the first channel 4-1 and the second channel 4-2, respectively. Figure 6 Compared with the existing technology shown, the channel is straight and short, and the liquid flow area remains unchanged; this not only makes the driving force of the hydraulic transmission continuously variable transmission drive axle stronger, but also ensures the stability of the hydraulic transmission continuously variable transmission drive axle during operation.

[0022] The above description is merely an embodiment of this utility model, and common knowledge such as specific structures and characteristics of the solution is not described in detail here. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these should also be considered within the protection scope of this utility model. These modifications and improvements will not affect the effectiveness of the implementation of this utility model or the practicality of the patent.

Claims

1. A hydraulically driven continuously variable transmission (CVT) drive axle, characterized in that: The device includes a housing, within which a transmission gear set, a hydraulic pump, and a hydraulic motor are housed, with a hydraulic base positioned between the hydraulic pump and the hydraulic motor. The hydraulic base has a hydraulic pump connection end and a hydraulic motor connection end, and a hydraulic flow channel is provided within the hydraulic base. The hydraulic flow channel includes a hydraulic pump port, a hydraulic motor port, and a channel connecting the two, the channel being formed by drilling. The hydraulic pump port is located at the hydraulic pump connection end, and the hydraulic motor port is located at the hydraulic motor connection end.

2. The hydraulic continuously variable transmission drive axle according to claim 1, characterized in that: The hydraulic flow channel has two independent channels.

3. The hydraulic transmission continuously variable transmission drive axle according to claim 2, characterized in that: The hydraulic motor port has two ports with different depths; the bottom of the hydraulic pump port is inclined to one side, and the channel passes through the side wall of the hydraulic pump port and communicates with the bottom of the corresponding hydraulic motor port.

4. The hydraulic transmission continuously variable transmission drive axle according to claim 1, characterized in that: The hydraulic base is made of wear-resistant material.

5. The hydraulic continuously variable transmission drive axle according to claim 1, characterized in that: The end face of the hydraulic motor connection extends beyond the side wall of the hydraulic pump port.

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