Gear eddy current transmission speed changer

Abstract

The invention relates to the technical field of variable transmission, in particular to a gear eddy current transmission speed changer. Comprising an input shaft, the input shaft is connected with a duplex variable gear, the duplex variable gear is connected with a center wheel of a planet differential mechanism, the planet differential mechanism comprises the center wheel, an outer gear ring and a planet carrier, the outer gear ring is connected with an output shaft, the planet carrier is connected with a planet carrier gap bridge gear in a meshed mode, and the planet carrier gap bridge gear is connected with a gap bridge shaft. The gap bridge shaft is in spline connection with the duplex variable-speed gap bridge teeth, and the duplex variable-speed gap bridge teeth are in meshed connection with the duplex variable-speed teeth. According to the gear eddy current transmission speed changer, power is in eddy current transmission in a transmission closed loop of the speed changer, the speed ratio change of the output end is achieved by changing the eddy rate of eddy current transmission, and the defects that an existing speed changer is small in speed changing range, complex in structure, large in size and high in cost are overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of variable-speed transmission, and particularly to a gear eddy current transmission gearbox. Background Art

[0002] Gearboxes are widely used in mechanical equipment and transportation vehicles. Among them, gear gearboxes are the most popular. Existing gear gearboxes achieve speed and distance changes by changing the tooth ratio of gear transmission. When the speed ratio range changes greatly, theoretically the tooth ratio of the transmission gears is large, and multi-stage gear transmission needs to be adopted, resulting in a large number of structures, an increase in volume, and corresponding complexity in speed and distance changes. Therefore, existing gearboxes have deficiencies such as a small speed change range, complex structures, large volume, and high costs. Summary of the Invention

[0003] The present invention provides a gear eddy current transmission gearbox. Power is transmitted in an eddy current in the transmission closed loop of the gearbox, and the speed ratio change at the output end is achieved by changing the eddy current rate of the eddy current transmission, overcoming the deficiencies of existing gearboxes such as a small speed change range, complex structures, large volume, and high costs.

[0004] The technical solution adopted by the present invention is as follows: A gear eddy current transmission gearbox includes an input shaft. The input shaft is connected to a double-connected variable-speed gear. The double-connected variable-speed gear is connected to the central gear of a planetary differential mechanism. The planetary differential mechanism includes a central gear, an outer gear ring, and a planetary carrier. The outer gear ring is connected to an output shaft. The planetary carrier is meshed and connected to a planetary carrier cross-connecting gear. The planetary carrier cross-connecting gear is connected to a cross-connecting shaft. The cross-connecting shaft is spline-connected to a double-connected variable-speed cross-connecting gear. The double-connected variable-speed cross-connecting gear is meshed and connected to the double-connected variable-speed gear.

[0005] As a further improvement of the present invention, the input shaft is connected to the double-connected variable-speed gear, and they are axially connected. The double-connected variable-speed gear is composed of two gears axially connected in parallel and on the same axis. Power is input from the input shaft.

[0006] As a further improvement of the present invention, the double-connected variable-speed gear is connected to the central gear of the planetary differential mechanism, and they are axially connected and coaxial with the input shaft.

[0007] As a further improvement of the present invention, the planetary differential mechanism is a three-free-end planetary differential mechanism, including a central gear free end, an outer gear ring free end, and a planetary carrier free end.

[0008] As a further improvement of the present invention, the outer gear ring of the planetary differential mechanism is connected to the output shaft to output power, and they are axially connected.

[0009] As a further improvement of the present invention, the planetary carrier of the planetary differential mechanism is meshed and connected to the planetary carrier cross-connecting gear, and they are radially meshed.

[0010] As a further improvement of the present invention, the planet carrier bridge teeth are connected to the bridge shaft, and the two are connected by a keyway with the same axis.

[0011] As a further improvement of the present invention, the bridge shaft is spline-connected with the double-speed shift bridge teeth, the two are on the same axis, the double-speed shift bridge teeth can slide axially on the bridge shaft, and the double-speed shift bridge teeth are composed of two gears in parallel.

[0012] As a further improvement of the present invention, the double-speed shifting bridge teeth are meshed with the double-speed shifting teeth, the two are radially meshed, and the double-speed shifting bridge teeth can be switched to mesh with the double-speed shifting teeth by axial sliding.

[0013] As a further improvement of the present invention, the input shaft, the double-speed gear, the center wheel, the planet carrier, the planet carrier bridge gear, the bridge shaft, and the double-speed gear bridge gear constitute a transmission closed loop.

[0014] The beneficial effects of the present invention are as follows: the present invention forms a transmission closed loop through the meshing connection between two or more gears and the center wheel and the planetary carrier of the planetary differential mechanism. When power is input into the transmission closed loop through the input shaft, eddy current transmission will be formed in the closed loop. Part of the power is transmitted back to the input point and repeatedly superimposed to form eddy current torque in the transmission closed loop. The generated eddy current torque is output by connecting the outer gear ring of the differential mechanism to the output shaft. The size of the eddy current torque depends on the eddy current rate, which is determined by the meshing connection and matching of all the gears constituting the transmission closed loop. The transmission speed ratio has no direct relationship with the gear tooth number ratio. The device has a simple structure, a large range of speed ratio variation in a single structure, simple speed change, small size, low cost and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural principle diagram of a gear eddy current transmission of the present invention;

[0016] Figure 2 It is a structural principle diagram of an internal planetary differential mechanism of a gear eddy current transmission of the present invention;

[0017] Figure 3 It is an illustration of an embodiment of a gear eddy current transmission of the present invention.

[0018] As shown in the figure: 1. Input shaft; 2. Double speed gear; 3. Planetary differential mechanism; 4. Center wheel; 5. Outer ring gear; 6. Planet carrier; 7. Output shaft; 8. Planet carrier bridge gear; 9. Bridge shaft; 10. Double speed gear bridge gear. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below with reference to specific illustrations. In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection or a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components.

[0020] Embodiment

[0021] Such as Figure 1 、 Figure 2 A gear eddy current transmission gearbox as shown includes an input shaft 1, the input shaft 1 is connected to a double-speed transmission gear 2, the double-speed transmission gear 2 is connected to a central gear 4 of a planetary differential mechanism 3, the planetary differential mechanism 3 includes a central gear 4, an outer gear ring 5, and a planetary carrier 6, the outer gear ring 5 is connected to an output shaft 7, the planetary carrier 6 is meshed and connected to a planetary carrier cross-over gear 8, the planetary carrier cross-over gear 8 is connected to a cross-over shaft 9, the cross-over shaft 9 is spline-connected to a double-speed transmission cross-over gear 10, and the double-speed transmission cross-over gear 10 is meshed and connected to the double-speed transmission gear 2.

[0022] It can be seen from Figure 1 that the input shaft 1, the double-speed transmission gear 2, the central gear 4, the planetary carrier 6, the planetary carrier cross-over gear 8, the cross-over shaft 9, and the double-speed transmission cross-over gear 10 are meshed and connected to form a transmission closed loop. When the power F is input into the transmission closed loop from the input shaft 1, an eddy current transmission will inevitably be formed within the transmission closed loop. Part of the power F returns to the input shaft 1 through the closed-loop transmission and is superimposed. In this way, the eddy current transmission is repeated. The power F becomes an eddy current torque N. The magnitude of the eddy current torque N depends on the eddy current rate W. The eddy current rate refers to the ratio of the power that repeats and returns to the origin every time it passes through the eddy current transmission. According to this definition, the eddy current rate W is equal to the product of the transmission ratios of all the gears constituting the transmission closed loop in sequence along the eddy current transmission direction. The eddy current rate W is less than or equal to 1. The relationship between the eddy current torque N and the power F is N = (1 / 1 - W)F. The eddy current torque N is output from the outer gear ring 5 of the planetary differential mechanism 3 to the output shaft according to the transmission law of the planetary differential structure. The closer the eddy current rate W is to 1, the greater the eddy current torque N. When the eddy current rate W is equal to 1, all the power F is transmitted within the closed loop and there is no torque output. At this time, since there is no external resistance to support in the reverse direction, the internal eddy current torque N is also zero. When the meshing position of the double-speed transmission cross-over gear 10 and the double-speed transmission gear 2 is switched, the eddy current rate W will change accordingly, and the eddy current torque N and the output torque will also change simultaneously. The specific description is as follows:

[0023] As described above, the specific description is as Figure 3As shown in the figure, when the number of teeth engaged by the double - speed gear 2 is 16, the number of teeth of the central gear 4 of the planetary differential mechanism 3 is 16, the number of teeth of the planet carrier 6 is 33, the number of teeth of the planet carrier cross - bridge gear 8 is 16, the number of teeth engaged by the double - speed cross - bridge gear 10 is 33, and the number of teeth of the outer ring gear 5 of the planetary differential mechanism 3 is 52. Assuming that the transmission closed - loop eddy - current transmission direction is input shaft 1 - double - speed gear 2 - central gear 4 - planet carrier 6 - planet carrier cross - bridge gear 8 - cross - bridge shaft 9 - double - speed cross - bridge gear 10 - input shaft 1. At this time, the double - speed gear 2 and the central gear 4 are coaxially connected with a transmission ratio of 1 / 1. The transmission ratio of the central gear 4 to the planet carrier 6 is (16 + 52) / 16, the transmission ratio of the planet carrier 6 to the planet carrier cross - bridge gear 8 is 16 / 33, the planet carrier cross - bridge gear 8 and the double - speed cross - bridge gear 10 are coaxially connected with a transmission ratio of 1 / 1, and the transmission ratio of the double - speed cross - bridge gear 10 to the double - speed gear 2 is 16 / 33. From the above, the eddy - current rate W of the transmission closed - loop is W = 1 / 1×68 / 16×16 / 33×1 / 1×16 / 33 = 1088 / 1089 < 1. The eddy - current torque N generated by the power F input into the transmission closed - loop is N=(1 / 1 - W)F = 1098F. The eddy - current torque N is output by the outer ring gear 5. According to the eddy - current transmission direction and the transmission law of the planetary differential mechanism 3, the output torque=(52 / 16)N = 3568.5F. That is to say, the speed ratio between the input end and the output end is 1 / 3568.5. If the transmission ratio of the double - speed cross - bridge gear 10 to the double - speed gear 2 is switched from 16 / 33 to 11 / 38, at this time the eddy - current rate W = 1 / 1×68 / 16×16 / 33×1 / 1×11 / 38 = 34 / 57 < 1. At this time, the eddy - current torque N=(1 / 1 - W)F=(57 / 23)F = 2.34F, and the output torque=(52 / 16)N = 7.63F. That is, the speed ratio between the input end and the output end is 1 / 7.63. If the transmission ratio of the double - speed cross - bridge gear 10 to the double - speed gear 2 is switched from 16 / 33 to 33 / 16, at this time 1 / 1×68 / 16×16 / 33×1 / 1×33 / 16 = 13 / 4 > 1, then the eddy - current direction is opposite to the assumed direction, and the eddy - current rate W is the reciprocal of this product, that is, W = 4 / 13. The eddy - current torque N=(1 / 1 - W)F=(13 / 9)F = 1.44F. According to the eddy - current direction and the transmission law of the planetary differential mechanism 2, at this time the output torque=(52 / 16 + 52)N = 1.1F. That is, the speed ratio between the input end and the output end is 1 / 1.1, and the output rotation direction is also opposite. If the transmission mode of the double - speed cross - bridge gear 10 to the double - speed gear 2 is changed to an adjustable stepless transmission, then this eddy - current transmission speed changer is an adjustable stepless speed changer.

[0024] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A gear eddy current transmission, characterized in that: It includes an input shaft (1), the input shaft (1) is connected to a double-speed transmission gear (2), the double-speed transmission gear (2) is connected to a central gear (4) of a planetary differential mechanism (3), the planetary differential mechanism (3) includes a central gear (4), an outer gear ring (5), and a planetary carrier (6), the outer gear ring (5) is connected to an output shaft (7), the planetary carrier (6) is engaged with a planetary carrier cross-over gear (8), the planetary carrier cross-over gear (8) is connected to a cross-over shaft (9), the cross-over shaft (9) is splined to a double-speed transmission cross-over gear (10), and the double-speed transmission cross-over gear (10) is engaged with the double-speed transmission gear (2).

2. The gear eddy current transmission according to claim 1, characterized in that: The input shaft (1) is connected to the double-speed transmission gear (2), and they are axially connected. The double-speed transmission gear (2) is composed of two gears axially arranged side by side on the same axis, and power is input from the input shaft (1).

3. A gear eddy current transmission according to claim 1, characterized in that: The double-speed transmission gear (2) is connected to the central gear (4) of the planetary differential mechanism (3), and they are axially connected and coaxial with the input shaft (1).

4. A gear eddy current transmission according to claim 1, characterized in that: The planetary differential mechanism (3) is a three-free-end planetary differential mechanism, including a central gear free end, an outer gear ring free end, and a planetary carrier free end.

5. A gear eddy current transmission according to claim 1, characterized in that: The outer gear ring (5) of the planetary differential mechanism (3) is connected to the output shaft (7) to output power, and they are axially connected.

6. The gear eddy current transmission according to claim 1, characterized in that: The planetary carrier (6) of the planetary differential mechanism (3) is engaged with the planetary carrier cross-over gear (8), and they are radially engaged.

7. The gear eddy current transmission according to claim 1, characterized in that: The planetary carrier cross-over gear (8) is connected to the cross-over shaft (9), and they are keyway-connected with the same axis.

8. A gear eddy current transmission according to claim 1, characterized in that: The cross-over shaft (9) is splined to the double-speed transmission cross-over gear (10), and they are on the same axis. The double-speed transmission cross-over gear (10) can axially slide on the cross-over shaft (9), and the double-speed transmission cross-over gear (10) is composed of two gears arranged side by side.

9. The gear eddy current transmission according to claim 1, characterized in that: The double-speed transmission cross-over gear (10) is engaged with the double-speed transmission gear (2), and they are radially engaged. The axial sliding of the double-speed transmission cross-over gear (10) can switch the engagement with the double-speed transmission gear (2).

10. A gear eddy current transmission according to claim 1, characterized in that: The input shaft (1), the double-speed transmission gear (2), the central gear (4), the planetary carrier (6), the planetary carrier cross-over gear (8), the cross-over shaft (9), and the double-speed transmission cross-over gear (10) form a transmission closed loop.

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