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

Abstract

The invention 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] The present invention specifically relates to a zero-turning-radius hydrostatic transmission continuously variable drive axle and a double-base. Background Art

[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, and the pressurized oil adjusts the flow rate and direction through a control mechanism and then drives a hydraulic motor to work. For existing zero-turning-radius drive axles, two sets of drive axles are required to separately control the rotational speeds of the left and right tires, enabling the vehicle to achieve in-place turning or zero-radius turning, that is, one side tire of the vehicle moves forward while the other side tire moves backward, allowing the vehicle to turn around its center without any arc. Due to the need for two sets of drive axles, there are many installation components, long assembly time and prone to failures. Also, the installation space required for the two sets of drive axles is large and the self-weight is heavy. Currently, it is impossible to achieve separate control of the left and right tires through a single drive axle. Summary of the Invention

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

[0004] The zero-turning-radius hydrostatic transmission continuously variable 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, and two sets of hydraulically smooth and straight inner walls of the hydraulic channels are provided in the double-base by drilling, and the two sets of hydraulic channels do not communicate with each other; the two hydraulic pumps are driven by the same transmission mechanism.

[0005] The advantages of the present invention are: 1) Separate control of the left and right tires can be achieved through a single drive axle. 2) The number of components such as the housing and shaft is reduced, improving the assembly efficiency. 3) With fewer assembled parts, the failure rate is reduced. 4) The parts are assembled compactly, with a small volume and light weight. 5) The original hydraulic pump and hydraulic motor can still be selected, reducing the processing cost.

[0006] Further, it also includes parking brakes located on both sides of the double-base. This makes two primary driving gears adjacent, saving installation space.

[0007] Further, the double-base is provided with a support for fixing the transmission shaft. There is no need to fix the transmission shaft through the axle housing.

[0008] Further, the double-base is provided with a fixing seat for fixing the hydraulic pump. The installation space is fully utilized, shortening the distance between the two hydraulic pumps. Further, it also includes an oil filter connected to the two sets of hydraulically smooth and straight inner walls of the hydraulic channels of the double-base by drilling.

[0009] Further, it also includes a axle housing, which includes a front housing and a rear housing; the front housing can accommodate a hydraulic pump, a dual base, and a hydraulic motor, and the rear housing can accommodate a secondary transmission gear. It is convenient for installation.

[0010] Further, the axle sleeve is provided with a sleeve, one end of the sleeve is fixed to the axle housing, and the other end is fixed to the mounting bracket. Compared with the existing method of limiting the axle shaft by elongating the housing, the production and processing difficulty is reduced.

[0011] The dual base includes a base body, the base body is provided with two pump connection ends and two hydraulic motor connection ends, and two groups of hydraulic flow channels are arranged in the dual base, and the two groups of hydraulic flow channels do not communicate with each other; the hydraulic flow channel includes a hydraulic pump port, a hydraulic motor port, and a channel connecting the two, wherein the hydraulic pump port is located at the pump connection end; 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] Further, each group of hydraulic flow channels has two and is arranged independently of each other. Description of the Drawings

[0013] Figure 1 It is a schematic diagram of the zero turning radius hydrostatic transmission continuously variable drive axle of the present invention;

[0014] Figure 2 It is a three-dimensional view of the zero turning radius hydrostatic transmission continuously variable drive axle of the present invention;

[0015] Figure 3 It is an internal structure diagram of the zero turning radius hydrostatic transmission continuously variable drive axle of the present invention;

[0016] Figure 4 It is an internal schematic diagram of the zero turning radius hydrostatic transmission continuously variable drive axle of the present invention;

[0017] Figure 5 It is a partial view of the zero turning radius hydrostatic transmission continuously variable drive axle of the present invention;

[0018] Figure 6 It is a three-dimensional view of the dual base in the zero turning radius hydrostatic transmission continuously variable drive axle of the present invention;

[0019] Figure 7 It is a side view of the dual base in the zero turning radius hydrostatic transmission continuously variable drive axle of the present invention;

[0020] Figure 8 It is Figure 7 a cross-sectional view taken along C-C in

[0021] Figure 9 It is Figure 7Cross-sectional view of D-D in the middle;

[0022] Figure 10 Top view of the double base in the zero-turning-radius hydrostatic transmission continuously variable drive axle of the present invention;

[0023] Figure 11 is Figure 10 Cross-sectional view of E-E in the middle.

[0024] In the figure, 1 is a 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 seat, 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 processing port, 2 is the hydraulic motor, 3 is the hydraulic pump, 4 is the parking brake, 5 is the flow direction control seat, 5-1 is the rotating shaft, 6 is the adjusting arm, 7 is the oil filter, 8-1 is the front housing, 8-2 is the rear housing, 9-1 is the primary driving gear, 9-2 is the primary driven gear, 9-3 is the secondary driving gear, 9-4 is the secondary driven gear, 10 is the sleeve, 11 is the hydraulic motor shaft, 12 is the half shaft, 13 is the transmission shaft, 14 is the pulley, 15 is the ring magnet. Detailed implementation manners

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

[0026] According to Figures 1 to 5 As shown, the zero-turning-radius hydrostatic transmission continuously variable drive axle in this solution includes a bridge housing and two sets of transmission gear sets, two hydraulic pumps 3 and two hydraulic motors 2 located inside the bridge housing. Among them, the transmission gear sets include a primary driving gear 9-1, a primary driven gear 9-2 and a secondary driving gear 9-3, a secondary driven gear 9-4; a double base 1 is provided between the hydraulic pump 3 and the hydraulic motor 2. Specifically, the two hydraulic motors 2 are respectively located on both 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 is provided with two hydraulic pump connection ends 1-2 and two hydraulic motor connection ends 1-3, and two groups of hydraulic flow channels that are drilled and have smooth and straight inner walls are provided inside the double base 1, and the two groups of hydraulic flow channels do not communicate with each other.

[0027] Preferably, both hydraulic motor connection ends 1-3 protrude from the base body 1-1, and the primary driving 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, and one end is sequentially connected to the hydraulic motor 2 and the parking brake 4; the other end is coaxially connected to the primary driving gear 9-1. This can make full use of the space between the two hydraulic motor connection ends 1-3 and shorten the length of the hydraulic motor shaft 11 at the same time.

[0028] The dual base 1 is provided with two supports 1-4 for fixing the transmission shaft 13. Preferably, the support 1-4 is arranged at the hydraulic motor connection end 1-3. Both the two primary driven gears 9-2 and the two secondary driving gears 9-3 are located between the two supports 1-4 and sleeved on the same transmission 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 sleeved with a sleeve 10. One end of the sleeve 10 is fixed to the axle housing, and the other end is fixed to the vehicle frame through a mounting bracket. There is no need for the axle housing to extend to cover the half shaft 12, and the stability of the half shaft 12 can be ensured through the sleeve 10. Moreover, the length of the half shaft 12 can be easily adjusted adaptively according to different requirements such as the width of the vehicle frame.

[0030] The dual 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 arranged 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 respectively arranged on both sides of the flow direction control seat 5. One of the rotating shafts 5-1 is inserted into the shaft hole of the fixing seat 1-5; the other rotating shaft 5-1 passes through the axle housing and is connected to the adjusting arm 6, that is, the adjusting arm 6 of the hydraulic pump 3 is arranged in front of the dual base 1. The rotating shaft 5-1 of the flow direction control seat 5 is installed along the length direction of the dual base 1, which can make full use of the space along the length direction above the dual base 1. Preferably, the positioning pin 1-7 of the dual base 1 is arranged in front of the dual base 1 and is parallel to the rotating shaft 5-1, and the positioning pin 1-7 is fixedly connected to the axle housing.

[0031] An oil filter 7 is arranged below the dual base 1, and the oil filter 7 is simultaneously communicated with two groups of hydraulic channels. An annular magnet 15 is arranged in the oil inlet channel of the oil filter 7. When it is necessary to remove the dirt on the annular magnet 15, only the oil filter 7 needs to be removed, and there is no need to disassemble the axle housing at all, 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 accommodate the hydraulic pump 3, the double-base 1 and the hydraulic motor 2, and the rear housing 8-2 is used to accommodate the secondary transmission gear.

[0034] According to Figures 6 to 11 As shown, the double-base 1 in this solution includes a base body 1-1, two hydraulic pump connection ends 1-2 and two hydraulic motor connection ends 1-3 provided thereon. There are two groups of hydraulic flow channels in the double-base 1, and the two groups of hydraulic flow channels are not connected to each other. The hydraulic flow channel includes a hydraulic pump 3 port, a hydraulic motor 2 port and a channel connecting the two; wherein, the channel is processed by drilling and the inner wall is smooth and straight. 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 group of hydraulic flow channels includes a first hydraulic flow channel and a second hydraulic flow channel. The first hydraulic flow channel and the second hydraulic flow channel are independently arranged. Specifically, the first hydraulic flow channel includes a first hydraulic pump port 1-21, a first hydraulic motor port 1-31 and a first channel 1-8 connecting the two; the second hydraulic flow channel includes a second hydraulic pump port 1-22, a second hydraulic motor port 1-32 and a second channel 1-9 connecting the two. The processing 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 processing 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. In this way, the lengths of the first channel 1-8 and the second channel 1-9 are quite equal, which is not only easy to process; and 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, and enough installation space can be reserved between the two hydraulic motor connection ends 1-3. The processing port 1-10 is installed with plugging parts such as plugs.

[0036] The double-base 1 is integrally provided with a connecting support 1-6. For the convenience of connecting with the axle housing, the connecting support 1-6 is located at the front end of the double-base 1. Bolts pass through the mounting holes on the connecting support 1-6 and are threadedly connected to the axle housing.

[0037] The above are only the embodiments of the present invention, and common knowledge such as the specific structures and characteristics known in the solution is not described in detail here. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent.

Claims

1. Zero turning radius hydrostatic transmission continuously variable speed drive axle, characterized by: It includes a transmission gear set, a hydraulic pump and a hydraulic motor, wherein a double base is arranged between the hydraulic pump and the hydraulic motor; the double base is provided with two pump connection ends and two hydraulic motor connection ends, and two groups of hydraulic flow channels processed by drilling are arranged inside the double base, and the two groups of hydraulic flow channels processed by drilling and having smooth and straight inner walls are not connected to each other; the two hydraulic pumps are driven by the same transmission mechanism.

2. The zero turning radius hydrostatic transmission continuously variable speed drive axle according to claim 1, characterized in that: Also included are parking brakes located on both sides of the tandem base.

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

4. The zero turning radius hydrostatic transmission continuously variable speed drive axle according to claim 1, characterized in that: A fixing seat for fixing the hydraulic pump is arranged on the double base.

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

6. The zero turning radius hydrostatic transmission continuously variable speed drive axle according to claim 1, characterized in that: The half-axle sleeve is provided with a sleeve, one end of the sleeve is fixed to the bridge housing, and the other end is fixed to the mounting frame.

7. Double base, characterized in that: It includes a base body, which is provided with two pump connection ends and two hydraulic motor connection ends. Two groups of hydraulic channels are provided in the double base, and the two groups of hydraulic channels are not connected to each other; the hydraulic channel includes a hydraulic pump port and a hydraulic motor port and a channel connecting the two, the hydraulic pump port is located at the pump connection end, the hydraulic motor port is located at the hydraulic motor connection end, and the channel is formed by drilling.

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

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