Hydraulic base and wheel-side hydrostatic transmission continuously variable transmission

Abstract

The utility model relates to a hydraulic base which comprises a base body, a hydraulic flow channel is arranged in the base body, and the hydraulic flow channel comprises a hydraulic pump port connected with a hydraulic pump, a hydraulic motor port connected with a hydraulic motor and a channel enabling the hydraulic pump port and the hydraulic motor port to be communicated. And the channel is a round channel which is formed by drilling and has a smooth and straight inner wall. The utility model further relates to a wheel-side hydrostatic transmission continuously variable transmission which comprises a shell, a hydraulic pump, a hydraulic motor and a transmission gear set are arranged in the shell, and the hydraulic pump and the hydraulic motor are installed on the hydraulic base. According to the scheme, the hydraulic base and the wheel-side hydrostatic transmission continuously variable transmission have the advantages of being easy to manufacture, small in resistance of a liquid flowing channel and high in transmission efficiency, and are stable in performance and longer in service life.

Description

Technical Field

[0001] This utility model specifically relates to a hydraulic base and a continuously variable transmission with hydrostatic transmission at the wheel side. Background Technology

[0002] The hydraulic base is a crucial component of a hydrostatic continuously variable transmission (CVT). Existing hydraulic bases are manufactured using aluminum alloy for the base body, with the internal fluid flow channels produced through casting. Due to the curved structure of the fluid flow channels and the high precision requirements of the channel inner walls, existing hydraulic bases typically employ lost foam casting. The casting process in lost foam casting is a critical and demanding step in the entire process. Hydraulic bases manufactured using this material and casting process have three main disadvantages: 1) The fluid flow channels are curved and narrow, making manufacturing relatively difficult and resulting in a high scrap rate. 2) The curved and rough fluid flow channels increase the flow resistance of the hydraulic fluid, reducing system efficiency. 3) Aluminum alloys have low hardness and are not wear-resistant, affecting the reliability and service life of the system. Utility Model Content

[0003] This utility model aims to provide a hydraulic base and a wheel-side hydrostatic transmission continuously variable transmission, which has the advantages of simple manufacturing, low resistance in the fluid flow channel, stable performance and longer service life.

[0004] One hydraulic base in this solution includes a base body, the base body having a hydraulic flow channel, the hydraulic flow channel including a hydraulic pump port connected to a hydraulic pump, a hydraulic motor port connected to a hydraulic motor, and a channel connecting the hydraulic pump port and the hydraulic motor port, the channel preferably being a circular channel with a smooth and straight inner wall formed by drilling.

[0005] Furthermore, the channel includes a first channel section and a second channel section; the first channel section is connected to the hydraulic pump port, and the second channel section is connected to the hydraulic motor port; the first channel section and the second channel section intersect and are connected. Preferably, the channel section can be two or more channels depending on the base body structure, and adjacent channels can be perpendicular to each other for ease of processing.

[0006] Furthermore, 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, a first hydraulic motor port and a first channel; the second hydraulic flow channel includes a second hydraulic pump port, a second hydraulic motor port and a second channel.

[0007] Furthermore, the bottom of the first hydraulic pump port is tilted to one side to facilitate communication with the first channel; the bottom of the second hydraulic pump port is recessed downwards in the middle and communicates with the second channel. This prevents interference between the first and second channels.

[0008] Furthermore, the base body is made of wear-resistant material. Specifically, the wear-resistant material can be selected from high-hardness materials such as ductile iron and alloy steel.

[0009] The advantages of this invention are: 1) The channel is manufactured using a drilling process, which not only simplifies manufacturing but also results in a smooth inner wall. 2) When liquid flows through the channel, the channel is shorter and the flow resistance is lower, thereby improving transmission efficiency. 3) Because the channel can be manufactured using drilling, the base body can be made of wear-resistant materials such as ductile iron or alloy steel, significantly improving its reliability and service life.

[0010] A wheel-side hydrostatic continuously variable transmission (CVT) includes a housing, within which a transmission gear, a hydraulic pump, and a hydraulic motor are housed. A hydraulic base, as described in the preceding claims, is disposed between the hydraulic pump and the hydraulic motor. Due to the smooth and shorter internal channels of the hydraulic base, the wheel-side hydrostatic CVT generates a stronger driving force. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the hydraulic base of this utility model;

[0012] Figure 2 This is a perspective view of the hydraulic base of this utility model;

[0013] Figure 3 This is a schematic diagram of the hydraulic flow channel in the hydraulic base of this utility model;

[0014] Figure 4 This is a cross-sectional view of the first hydraulic flow channel in the hydraulic base of this utility model;

[0015] Figure 5 This is a cross-sectional view of the second hydraulic flow channel in the hydraulic base of this utility model;

[0016] Figure 6 This is a structural diagram of the wheel-side hydrostatic transmission continuously variable transmission of this utility model;

[0017] Figure 7 for Figure 6 Enlarged view of M;

[0018] Figure 8 This is a cross-sectional view of a hydraulic base in the prior art.

[0019] In the diagram, 1 is the base body, 2 is the first hydraulic flow channel, 2-1 is the first hydraulic pump port, 2-11 is the bottom of the first hydraulic pump port, 2-2 is the first hydraulic motor port, 2-3 is the first channel, 3 is the second hydraulic flow channel, 3-1 is the second hydraulic pump port, 3-11 is the bottom of the second hydraulic pump port, 3-2 is the second hydraulic motor port, 3-3 is the second channel, 4a is the first channel section, 4b is the second channel section, 5 is the positioning pin, 6 is the machining port, 7 is the sealing component, 8 is the transmission gear set, and 9 is the hydraulic pump. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0021] according to Figures 1 to 5 As shown, a hydraulic base includes a base body 1, which is made of wear-resistant materials such as ductile iron or alloy steel. The base body 1 has a hydraulic flow channel, including a hydraulic pump 9 port connected to a hydraulic pump 9, a hydraulic motor port connected to a hydraulic motor, and a channel connecting the hydraulic pump 9 port and the hydraulic motor port. This channel is a circular channel with a smooth and straight inner wall, formed by drilling. Specifically, the channel includes a first channel 4a and a second channel 4b; the first channel 4a connects to the hydraulic pump 9 port, and the second channel 4b connects to the hydraulic motor port; the first channel 4a and the second channel 4b intersect and connect. The base body 1 also has a locating pin 5 integrally formed with the base body 1, which is preferably a hollow structure. The machined opening 6 of the channel can be sealed using a sealing component 7 (such as a plunger).

[0022] As a further improvement of this utility model, the hydraulic flow channel includes a first hydraulic flow channel 2 and a second hydraulic flow channel 3; the first hydraulic flow channel 2 includes a first hydraulic pump port 9-1, a first hydraulic motor port 2-2, and a first channel 2-3; the second hydraulic flow channel 3 includes a second hydraulic pump port 9-1, a second hydraulic motor port 3-2, and a second channel 3-3. The bottom 2-11 of the first hydraulic pump port 9 is tilted to one side to facilitate communication with the first channel 2-3; the bottom 3-11 of the second hydraulic pump port 9 is recessed downwards in the middle and communicates with the second channel 3-3. This structure prevents interference between the first channel 2-3 and the second channel 3-3.

[0023] In this invention, the channel through which the liquid flows is as follows: Figure 3 As shown, the dashed line in the cross-sectional view AA represents the channel length, which is the sum of the first channel 4a and the second channel 4b. (Compared to existing technology) Figure 8 Compared to the curved channel shown, the channel of this utility model is shorter, further improving transmission efficiency; and the external structural volume of the base body 1 remains unchanged, but the manufacturing difficulty is reduced, greatly shortening the processing cycle.

[0024] Depending on the application scenario, the hydraulic base can be divided into a left hydraulic base and a right hydraulic base, which are mirror images of each other.

[0025] according to Figure 6 , 7 As shown, a wheel-side hydrostatic continuously variable transmission (CVT) includes a housing. Inside the housing are a transmission gear set 8, a hydraulic pump 9, and a hydraulic motor. A hydraulic base is provided between the hydraulic pump 9 and the hydraulic motor. Because this wheel-side hydrostatic CVT only requires replacement of the hydraulic base, eliminating the need to replace major components such as the transmission gear set 8, hydraulic pump 9, and hydraulic motor, it extends the service life of the CVT while also saving production costs and time.

[0026] 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, without affecting the effectiveness of the implementation of this utility model and the practicality of the patent.

Claims

1. A hydraulic base, characterized in that: The device includes a base body, which has a hydraulic flow channel inside. The hydraulic flow channel includes a hydraulic pump port connected to a hydraulic pump, a hydraulic motor port connected to a hydraulic motor, and a channel connecting the hydraulic pump port and the hydraulic motor port. The channel is formed by drilling.

2. A hydraulic base according to claim 1, characterized in that: The channel includes a first channel section and a second channel section; the first channel section is connected to the hydraulic pump port, and the second channel section is connected to the hydraulic motor port; the first channel section and the second channel section intersect and are connected.

3. A hydraulic base according to claim 1 or 2, characterized in that: 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, a first hydraulic motor port and a first channel; the second hydraulic flow channel includes a second hydraulic pump port, a second hydraulic motor port and a second channel.

4. A hydraulic base according to claim 3, characterized in that: The bottom of the first hydraulic pump port is tilted to one side to facilitate communication with the first channel; the bottom of the second hydraulic pump port is recessed in the middle and communicates with the second channel.

5. A hydraulic base according to claim 1, characterized in that: The base body is made of wear-resistant material.

6. A wheel-side hydrostatic transmission continuously variable transmission, comprising a housing, wherein a transmission gear, a hydraulic pump, and a hydraulic motor are disposed within the housing, characterized in that: A hydraulic base as described in any one of claims 1-5 is provided between the hydraulic pump and the hydraulic motor.

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