Zero-steering-radius hydrostatic transmission stepless speed change drive axle and duplex base

Abstract

The utility model particularly relates to a zero-steering-radius hydrostatic transmission stepless speed change drive axle. Comprising a transmission gear set, a hydraulic pump and a hydraulic motor, and a duplex base is arranged between the hydraulic pump and the hydraulic motor; the duplex base is provided with two hydraulic pump connecting ends and two hydraulic motor connecting ends, two groups of hydraulic flow channels which are machined by drilling and have smooth and straight inner walls are arranged in the duplex base, and the two groups of hydraulic flow channels which are machined by drilling and have smooth and straight inner walls are not communicated with each other; and the two hydraulic pumps are driven by the same transmission mechanism. The zero-steering-radius static pressure transmission stepless speed change drive axle has the advantages that the tires on the left side and the right side can be separately controlled through one set of drive axle, and a vehicle can conduct zero-radius steering.

Description

Technical Field

[0001] This utility model specifically relates to a zero-turning-radius hydrostatic transmission continuously variable transmission drive axle and a double-base. 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 terms of flow and direction by a control mechanism, thus driving a hydraulic motor. Existing zero-turn radius drive axles require two drive axles to control the rotational speed of the left and right tires separately, enabling the vehicle to turn on the spot or achieve zero-radius turning. This means one tire moves forward while the other moves backward, allowing the vehicle to turn around its center without any arc. Because it requires two drive axles, there are many components to install, assembly time is long, and it is prone to failure. Furthermore, the installation space required for two drive axles is large, and they are heavy. Currently, it is not possible to achieve separate control of the left and right tires using a single drive axle. Utility Model Content

[0003] The present invention aims to provide a zero-radius hydrostatic transmission continuously variable transmission drive axle, which can realize the separate control of the left and right tires through a single drive axle, enabling the vehicle to perform zero-radius steering.

[0004] The zero-turning-radius hydrostatic transmission continuously variable transmission drive axle in this solution includes a transmission gear set, a hydraulic pump, and a hydraulic motor. A double base is provided between the hydraulic pump and the hydraulic motor. The double base has two pump connection ends and two hydraulic motor connection ends. The double base has two sets of hydraulic flow channels with smooth and straight inner walls, which are drilled and machined. The two sets of hydraulic flow channels are not interconnected. The two hydraulic pumps are driven by the same transmission mechanism.

[0005] The advantages of this invention are: 1) The left and right tires can be controlled separately using a single drive axle. 2) It reduces the number of components such as the housing and axle, improving assembly efficiency. 3) Fewer assembly parts reduce the failure rate. 4) The parts are compactly assembled, resulting in a small size and light weight. 5) Existing hydraulic pumps and motors can still be used, reducing processing costs.

[0006] Furthermore, it also includes parking brakes located on both sides of the double base. This places the two primary drive gears adjacent to each other, saving installation space.

[0007] Furthermore, the double-base is equipped with a support for fixing the drive shaft. This eliminates the need to fix the drive shaft via the axle housing.

[0008] Furthermore, the double-base is equipped with a mounting bracket for fixing the hydraulic pumps. This makes full use of the installation space and shortens the distance between the two hydraulic pumps. Additionally, it includes oil filters connected to two sets of drilled, smooth-walled, straight hydraulic flow channels on the double-base.

[0009] Furthermore, it also includes an axle housing, which comprises a front housing and a rear housing; the front housing can accommodate a hydraulic pump, a double base, and a hydraulic motor, while the rear housing can accommodate a secondary transmission gear. This facilitates installation.

[0010] Furthermore, the half-shaft is fitted with a sleeve, one end of which is fixed to the axle housing, and the other end is fixed to a mounting bracket. Compared with existing methods that limit the movement of the half-shaft by elongating the housing, this reduces the difficulty of manufacturing and processing.

[0011] The double-base includes a base body, which has two pump connection ends and two hydraulic motor connection ends. The double-base contains two sets of hydraulic flow channels, which are not interconnected. Each 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 pump connection end, and the hydraulic motor port is located at the hydraulic motor connection end. The channel is formed by drilling, and its inner wall is smooth and straight.

[0012] Furthermore, each set of hydraulic channels has two independent hydraulic channels. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the zero-turning-radius hydrostatic transmission continuously variable transmission drive axle of this utility model;

[0014] Figure 2 This is a perspective view of the zero-steering-radius hydrostatic transmission continuously variable transmission drive axle of this utility model;

[0015] Figure 3 This is an internal structural diagram of the zero-steering-radius hydrostatic transmission continuously variable transmission drive axle of this utility model;

[0016] Figure 4 This is an internal schematic diagram of the zero-turning-radius hydrostatic transmission continuously variable transmission drive axle of this utility model;

[0017] Figure 5 This is a partial view of the zero-steering-radius hydrostatic transmission continuously variable transmission drive axle of this utility model;

[0018] Figure 6 This is a perspective view of the double-base structure in the zero-steering-radius hydrostatic transmission continuously variable transmission drive axle of this utility model.

[0019] Figure 7 This is a side view of the double-base structure in the zero-turning-radius hydrostatic transmission continuously variable transmission drive axle of this utility model.

[0020] Figure 8 for Figure 7 Sectional view of CC;

[0021] Figure 9 for Figure 7 Sectional view of DD;

[0022] Figure 10 This is a top view of the double-base structure in the zero-steering-radius hydrostatic transmission continuously variable transmission drive axle of this utility model.

[0023] Figure 11 for Figure 10 A sectional view of EE.

[0024] In the diagram, 1 is the double base, 1-1 is the base body, 1-2 is the hydraulic pump connection end, 1-21 is the first hydraulic pump port, 1-22 is the second hydraulic pump port, 1-3 is the hydraulic motor connection end, 1-31 is the first hydraulic motor port, 1-32 is the second hydraulic motor port, 1-4 is the support, 1-5 is the fixed base, 1-6 is the connecting support, 1-7 is the positioning pin, 1-8 is the first channel, 1-9 is the second channel, 1-10 is the machining port, 2 1 is a hydraulic motor, 2 is a hydraulic pump, 3 is a parking brake, 4 is a flow direction control seat, 5-1 is a rotating shaft, 6 is an adjusting arm, 7 is an oil filter, 8-1 is a front housing, 8-2 is a rear housing, 9-1 is a primary drive gear, 9-2 is a primary driven gear, 9-3 is a secondary drive gear, 9-4 is a secondary driven gear, 10 is a sleeve, 11 is a hydraulic motor shaft, 12 is a half shaft, 13 is a drive shaft, 14 is a pulley, and 15 is a ring magnet. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0026] according to Figures 1 to 5 As shown, the zero-turning-radius hydrostatic transmission continuously variable transmission (CVT) drive axle in this scheme includes an axle housing and two sets of transmission gears, two hydraulic pumps 3, and two hydraulic motors 2 located within the axle housing. The transmission gear sets include a primary driving gear 9-1, a primary driven gear 9-2, a secondary driving gear 9-3, and a secondary driven gear 9-4. A double-base 1 is provided between the hydraulic pumps 3 and the hydraulic motors 2. Specifically, the two hydraulic motors 2 are located on opposite sides of the double-base 1, and the two hydraulic pumps 3 are arranged side-by-side above the double-base 1. The double-base 1 has two hydraulic pump connection ends 1-2 and two hydraulic motor connection ends 1-3. The double-base 1 contains two sets of drilled, smooth, and straight hydraulic flow channels; the two sets of hydraulic flow channels are not interconnected.

[0027] Preferably, both hydraulic motor connection ends 1-3 protrude from the base body 1-1, and the primary drive gear 9-1 is located between the two hydraulic motor connection ends 1-3. Specifically, the hydraulic motor shaft 11 passes through the hydraulic motor connection ends 1-3, with one end connected to the hydraulic motor 2 and the parking brake 4 in sequence; the other end is coaxially connected to the primary drive gear 9-1. This fully utilizes the space between the two hydraulic motor connection ends 1-3 while shortening the length of the hydraulic motor shaft 11.

[0028] The double base 1 is provided with two supports 1-4 for fixing the drive shaft 13. Preferably, the supports 1-4 are located at the hydraulic motor connection end 1-3. The two primary driven gears 9-2 and the two secondary driving gears 9-3 are all located between the two supports 1-4 and are sleeved on the same drive shaft 13. This structure can minimize the distance between the two secondary driving gears 9-3.

[0029] One end of the half-shaft 12 extends into the axle housing and is coaxially connected to the secondary driven gear 9-4. The other end of the half-shaft 12 is fitted with a sleeve 10. One end of the sleeve 10 is fixed to the axle housing, and the other end is fixed to the frame via a mounting bracket. There is no need for the axle housing to extend out and completely enclose the half-shaft 12; the sleeve 10 is sufficient to ensure the stability of the half-shaft 12. Furthermore, the length of the half-shaft 12 can be easily adjusted to meet different requirements such as the frame width.

[0030] The double-base 1 is also provided with a fixing seat 1-5 for fixing the flow direction control seat 5. The two fixing seats 1-5 are preferably located in the middle of the base body 1-1, that is, between the hydraulic pump connection end 1-2 and the hydraulic motor connection end 1-3. The flow direction control seat 5 is installed on the hydraulic pump 3 and is used to adjust and control the flow direction of the hydraulic pump 3. A rotating shaft 5-1 is provided on each side of the flow direction control seat 5. One rotating shaft 5-1 is inserted into the shaft hole of the fixing seat 1-5; the other rotating shaft 5-1 passes through the bridge housing and connects to the adjusting arm 6, that is, the adjusting arm 6 of the hydraulic pump 3 is located in front of the double-base 1. The rotating shaft 5-1 of the flow direction control seat 5 is installed along the length direction of the double-base 1, which can make full use of the space above the double-base 1 along the length direction. Preferably, the positioning pin 1-7 of the double-base 1 is located in front of the double-base 1 and parallel to the rotating shaft 5-1. The positioning pin 1-7 is fixedly connected to the bridge housing.

[0031] An oil filter 7 is located below the double base 1, and the oil filter 7 is connected to both sets of hydraulic flow channels. An annular magnet 15 is installed in the oil inlet channel of the oil filter 7. When it is necessary to clean the dirt on the annular magnet 15, it is only necessary to remove the oil filter 7, without disassembling the bridge housing, which is extremely convenient and time-saving.

[0032] The two hydraulic pumps 3 are driven by the same transmission mechanism, which is preferably a pulley 14 in this embodiment.

[0033] The axle housing includes a front housing 8-1 and a rear housing 8-2. The front housing 8-1 is used to house the hydraulic pump 3, the double base 1, and the hydraulic motor 2, while the rear housing 8-2 is used to house the secondary transmission gear.

[0034] according to Figures 6 to 11 As shown, the double-base 1 in this scheme includes a base body 1-1 and two hydraulic pump connection ends 1-2 and two hydraulic motor connection ends 1-3 disposed thereon. The double-base 1 has two sets of hydraulic flow channels, and the two sets of hydraulic flow channels are not interconnected. The hydraulic flow channel includes a hydraulic pump 3 port and a hydraulic motor 2 port, as well as a channel connecting the two; wherein, the channel is drilled and has a smooth and straight inner wall, the hydraulic pump 3 port is located at the hydraulic pump connection end 1-2, and the hydraulic motor 2 port is located at the hydraulic motor connection end 1-3.

[0035] Each hydraulic flow channel includes a first hydraulic flow channel and a second hydraulic flow channel, which are independently configured. Specifically, the first hydraulic flow channel includes a first hydraulic pump port 1-21 and a first hydraulic motor port 1-31, as well as a first channel 1-8 connecting the two. The second hydraulic flow channel includes a second hydraulic pump port 1-22 and a second hydraulic motor port 1-32, as well as a second channel 1-9 connecting the two. The machining port 1-10 of the first channel 1-8 is located at the front end of the base body 1-1, specifically on the side wall of the hydraulic pump connection end 1-2. The machining port 1-10 of the second channel 1-9 is located at the rear end of the base body 1-1, specifically on the side wall of the hydraulic motor connection end 1-3. Thus, the first channel 1-8 and the second channel 1-9 are of similar length, facilitating machining. Furthermore, the axial width b1 of the hydraulic motor connection end 1-3 is smaller than the radial width b2 of the hydraulic pump connection end 1-2, allowing sufficient installation space between the two hydraulic motor connection ends 1-3. Plugs and other sealing components are installed at the machining port 1-10.

[0036] The double-base 1 is integrally provided with a connecting support 1-6, which is located at the front end of the double-base 1 for easy connection with the axle housing. Bolts pass through the mounting holes on the connecting support 1-6 and are threaded into the axle housing.

[0037] 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 zero-turning-radius hydrostatic transmission continuously variable transmission drive axle, characterized in that: The system includes a transmission gear set, a hydraulic pump, and a hydraulic motor. A double base is provided between the hydraulic pump and the hydraulic motor. The double base has two pump connection ends and two hydraulic motor connection ends. The double base has two sets of hydraulic flow channels machined by drilling. The two sets of hydraulic flow channels with smooth and straight inner walls are not interconnected. The two hydraulic pumps are driven by the same transmission mechanism.

2. The zero-turning-radius hydrostatic transmission continuously variable transmission drive axle according to claim 1, characterized in that: It also includes parking brakes located on both sides of the double base.

3. The zero-turning-radius hydrostatic transmission continuously variable transmission drive axle according to claim 1, characterized in that: The double-base is provided with a support for fixing the drive shaft.

4. The zero-turning-radius hydrostatic transmission continuously variable transmission drive axle according to claim 1, characterized in that: The double-base is equipped with a mounting bracket for fixing the hydraulic pump.

5. The zero-turning-radius hydrostatic transmission continuously variable transmission drive axle according to claim 1, characterized in that: It also includes an axle housing, which comprises a front housing and a rear housing; the front housing can accommodate a hydraulic pump, a double base, and a hydraulic motor, and the rear housing can accommodate a secondary transmission gear.

6. The zero-turning-radius hydrostatic transmission continuously variable transmission drive axle according to claim 1, characterized in that: It also includes a half shaft, which is fitted with a sleeve. One end of the sleeve is fixed to the axle housing, and the other end is fixed to the mounting bracket.

7. A double-linked base, characterized in that: The system includes a base body, which has two pump connection ends and two hydraulic motor connection ends. The double base has two sets of hydraulic flow channels, which are not interconnected. Each 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 pump connection end, and the hydraulic motor port is located at the hydraulic motor connection end. The channel is formed by drilling.

8. The double-unit base according to claim 7, characterized in that: Each set of hydraulic channels includes a first hydraulic channel and a second hydraulic channel, and the two hydraulic channels are set independently of each other.

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