Clamp for machining duplex planet gear of single-stage coaxial speed reducer

Abstract

The utility model provides a clamp for machining a duplex planet wheel of a single-stage coaxial speed reducer. The clamp comprises a fixing shaft, a clamp base, a positioning sliding block and an adjusting sliding block. The fixed shaft is vertically fixed on the clamp seat; the clamp base is provided with a containing cavity, and the positioning sliding block and the adjusting sliding block are connected into the containing cavity in a sliding mode. The clamp base is further connected with a sliding assembly. The positioning sliding block and the adjusting sliding block are each connected with a positioning cylindrical pin, and the axes of the two positioning cylindrical pins are located on the same straight line. The sliding assembly drives the two positioning cylindrical pins to be embedded into the planet shaft gear and the tooth groove of the planet shaft gear respectively and make contact with the tooth profile. According to the clamp, the number of precision machining parts is reduced, and the tool manufacturing difficulty and cost are remarkably reduced. After the planetary shaft gear and the planetary plate gear are assembled, the device is used for adjusting the symmetry degree of the tooth grooves, abrasion between the planetary shaft gear and the positioning cylindrical pin and abrasion between the planetary plate gear and the positioning cylindrical pin can be reduced, and the service life of the clamp is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of speed reducer tooling fixtures, and in particular to a fixture for machining double planetary gears of a single-stage coaxial speed reducer. Background Technology

[0002] Single-stage coaxial reducers can utilize NGW planetary structures and WW planetary structures. However, due to structural limitations, the strength of the NGW planetary structure decreases significantly when the actual speed ratio is less than 3. Therefore, the WW planetary structure is the preferred structure for single-stage concentric reducers with small speed ratios (1 to 3). The WW planetary structure includes a planetary gear shaft 10 and a planetary gear disc 20. The planetary gear disc is mounted on the planetary gear shaft to form a double planetary gear set, and is circumferentially fixed by locating pins 40 (which require drilled locating pin holes). Due to the meshing requirements, the WW planetary structure... Figure 1 As shown, one of the two rows of gears in the double planetary gear set must have a tooth groove 30 that is strictly symmetrical, which places high demands on the machining of the locating pin hole.

[0003] To meet the above requirements, a double planetary gear assembly fixture has been developed in the prior art. For example, Chinese patent CN201910524008.0 discloses a combined double gear pressing method and fixture. The fixture is designed to align the teeth of the combined gears. The fixture is designed as a combination and has two sets of internal tooth profiles that are exactly the same as those of the double planetary gears. The double gears are designed as one set of helical gears and one set of spur gears. The tooth profiles of the double planetary gears and the fixture can be made to coincide. The helical gears are fixed by several positioning steel balls, and the helical gear sleeves and spur gear sleeves are fixed by positioning pins so that the angles of the two tooth profiles will not change after assembly. The spur gear shaft is directly pressed in by a press, so that the spur gear coincides with the spur gear sleeve and the helical gear coincides with the helical gear sleeve.

[0004] However, the tooling disclosed in the aforementioned patent uses two sets of internal tooth profiles (spur gear sleeves and helical gear sleeves) identical to those of the double planetary gear set to mesh the two planetary gears. This results in a complex structure and high manufacturing costs. Furthermore, because the spur gears and spur gear sleeves overlap, and the helical gears and helical gear sleeves overlap, wear is likely to occur during the press-fitting process. Once the spur gear sleeves and helical gear sleeves wear out, the overlap between the spur gears and spur gear sleeves, and the clearance between the helical gears and helical gear sleeves, will increase. In this case, the spur gear sleeves and helical gear sleeves must be replaced; otherwise, it is difficult to guarantee that one of the gears in each row of the double planetary gear set must have strictly symmetrical tooth grooves. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a fixture for machining double planetary gears of a single-stage coaxial reducer, which can simplify the structure of the tooling fixture, reduce costs, reduce wear and extend the service life of the fixture.

[0006] This utility model is implemented as follows:

[0007] This utility model provides a fixture for machining a double planetary gear in a single-stage coaxial reducer. The double planetary gear includes a planetary shaft gear and a planetary disk gear. The fixture includes a fixed shaft, a fixture seat, a positioning slider, and an adjusting slider.

[0008] The fixed shaft is vertically fixed on the fixture seat, the planetary shaft gear is sleeved on the fixed shaft, and the planetary disk gear is sleeved on the planetary shaft gear;

[0009] The fixture seat has a receiving cavity, and the positioning slider and the adjusting slider are slidably connected in the receiving cavity. The adjusting slider is disposed above the positioning slider, so that the planetary shaft gear corresponds to the positioning slider and the planetary disk gear corresponds to the adjusting slider.

[0010] The fixture base is also connected to a sliding assembly that drives the positioning slider and the adjusting slider to slide respectively;

[0011] The positioning slider and the adjusting slider are each connected to a positioning cylindrical pin, and the axes of the two positioning cylindrical pins are located on the same straight line along the sliding direction of the positioning slider and the adjusting slider.

[0012] The sliding component drives the two positioning cylindrical pins to embed into the tooth grooves of the planetary shaft gear and the planetary shaft gear respectively, and to contact the tooth profile.

[0013] Furthermore, both sliding components are adjusting screws, and the two adjusting screws are respectively threaded to the clamp seat, with one adjusting screw abutting against the positioning slider and the other adjusting screw abutting against the adjustment slider.

[0014] Furthermore, the fixture base includes a base plate, a top plate, a side plate, and a back plate. The fixed shaft is fixedly connected to the base plate. The back plate is located at the end of the base plate away from the fixed shaft. The top plate is fixed to the upper end of the back plate by screws. The positioning slider and the adjusting slider are located between the top plate and the base plate. The side plates are fixed to both sides of the base plate, and the upper end of the side plates extends to the top plate and is connected to the top plate by screws.

[0015] Furthermore, the positioning slider has a first clearance groove on the side near the planetary shaft gear, and the adjusting slider has a second clearance groove on the side near the planetary disk gear.

[0016] The advantages of this utility model are:

[0017] Gear positioning is achieved through the cooperation of a fixed shaft, a positioning slider, an adjusting slider, adjusting screws, and a positioning cylindrical pin. Compared to traditional tooling that requires the design of two sets of high-precision internal tooth profile sleeves, this fixture reduces the number of precision-machined parts, significantly reducing the difficulty and cost of tooling manufacturing.

[0018] After the planetary shaft gear and planetary disk gear are assembled, this device can be used to adjust the symmetry of the tooth grooves, which can reduce the wear between the planetary shaft gear and planetary disk gear and the positioning cylindrical pin, and extend the service life of the fixture. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of a double planetary gear structure in the prior art.

[0021] Figure 2 This is a schematic diagram of the structure of a fixture for machining double planetary gears of a single-stage coaxial reducer according to the present invention.

[0022] Figure 3 for Figure 2 Enlarged view of a portion of point A in the middle.

[0023] Figure 4 for Figure 2 Top view of the structure shown.

[0024] Figure 5 for Figure 4 Enlarged view of section B in the middle.

[0025] Explanation of the labels in the diagram:

[0026] 1. Planetary shaft gear; 2. Planetary disk gear; 3. Fixed shaft; 4. Fixture base; 41. Base plate; 42. Top plate; 43. Side plate; 44. Back plate; 5. Positioning slider; 51. First clearance groove; 6. Adjusting slider; 61. Second clearance groove; 7. Receiving cavity; 8. Sliding assembly; 9. Positioning cylindrical pin. Detailed Implementation

[0027] Please see Figures 2 to 5 This utility model provides a fixture for machining a double planetary gear in a single-stage coaxial reducer. The double planetary gear includes a planetary shaft gear 1 and a planetary disk gear 2. The fixture includes a fixed shaft 3, a fixture seat 4, a positioning slider 5, and an adjusting slider 6.

[0028] The fixed shaft 3 is vertically fixed on the clamp seat 4, the planetary shaft gear 1 is sleeved on the fixed shaft 3, and the planetary disk gear 2 is sleeved on the planetary shaft gear 1;

[0029] The clamp seat 4 has a receiving cavity 7, and the positioning slider 5 and the adjusting slider 6 are slidably connected in the receiving cavity 7. The adjusting slider 6 is disposed above the positioning slider 5, so that the planetary shaft gear 1 corresponds to the positioning slider 5 and the planetary disk gear 2 corresponds to the adjusting slider 6; the adjusting slider 6 and the positioning slider 5 can slide relative to each other.

[0030] The fixture base 4 is also connected to a sliding assembly 8 that drives the positioning slider 5 and the adjusting slider 6 to slide respectively;

[0031] The positioning slider 5 and the adjusting slider 6 are respectively connected to a positioning cylindrical pin 9, and the axes of the two positioning cylindrical pins 9 are located on the same straight line along the sliding direction of the positioning slider 5 and the adjusting slider 6; the positioning slider 5 and the adjusting slider 6 move radially along the fixed shaft 3.

[0032] The sliding component 8 drives the two positioning cylindrical pins 9 to be respectively embedded in the tooth grooves of the planetary shaft gear 1 and the planetary shaft gear 1, and to contact the tooth profile.

[0033] Specifically, both sliding components 8 are adjusting screws, and the two adjusting screws are threadedly connected to the clamp seat 4, with one adjusting screw abutting against the positioning slider 5 and the other adjusting screw abutting against the adjusting slider 6.

[0034] Specifically, the fixture base 4 includes a base plate 41, a top plate 42, a side plate 43, and a back plate 44. The fixing shaft 3 is fixedly connected to the base plate 41. The back plate 44 is located at the end of the base plate 41 away from the fixing shaft 3. The top plate 42 is fixed to the upper end of the back plate 44 with screws. The positioning slider 5 and the adjusting slider 6 are located between the top plate 42 and the base plate 41. The side plate 43 is fixed to both sides of the base plate 41, and the upper end of the side plate 43 extends to the top plate 42 and is connected to the top plate 42 with screws. The side plate 43 contacts the positioning slider 5 and the adjusting slider 6 and guides the sliding of the positioning slider 5 and the adjusting slider 6.

[0035] Specifically, the positioning slider 5 has a first clearance groove 51 on the side near the planetary shaft gear 1, and the adjusting slider 6 has a second clearance groove 61 on the side near the planetary disk gear 2. The first clearance groove 51 and the second clearance groove 61 are used to prevent interference between the positioning slider 5 and the adjusting slider 6 and the double planetary gear.

[0036] One specific application of this utility model is:

[0037] After the planetary shaft gear 1 and the planetary disk gear 2 are assembled into a double planetary gear, the planetary shaft gear 1 is fitted onto the outer wall of the fixed shaft 3. By rotating the adjusting screw below, the positioning slider 5 is driven to slide so that the outer wall of one of the positioning cylindrical pins 9 contacts the tooth profiles on both sides of the tooth groove of the planetary shaft gear 1. If at this time, the positioning cylindrical pin 9 only contacts the tooth profile on one side of the tooth groove, the double planetary gear can be rotated to make the outer wall of the positioning cylindrical pin 9 contact the tooth profiles on both sides of the tooth groove, thereby achieving the positioning function.

[0038] Then rotate another adjusting screw to drive another positioning cylindrical pin 9 into the tooth groove of the planetary disk gear 2. If there is a symmetry deviation between the tooth grooves of the planetary disk gear 2 and the planetary shaft gear 1, the positioning cylindrical pin 9 will only contact the tooth profile on one side. By rotating the planetary disk gear 2 relative to the axis of the planetary shaft gear 1, the positioning cylindrical pin 9 will contact the tooth profiles on both sides of the tooth groove.

[0039] As mentioned earlier, since the axes of the two positioning cylindrical pins 9 are on the same straight line along the sliding direction of the positioning slider 5 and the adjusting slider 6, adjusting the two positioning cylindrical pins 9 to contact the tooth profiles on both sides of the corresponding tooth groove in the above manner can ensure that the tooth grooves of the double planetary gear at the positioning cylindrical pins 9 are strictly symmetrical. Subsequently, the adjusted double planetary gear is fitted with positioning pin holes.

[0040] The advantages of this invention are as follows: tooth positioning is achieved through the cooperation of the fixed shaft 3, positioning slider 5, adjusting slider 6, adjusting screw, and positioning cylindrical pin 9. Compared with traditional tooling that requires the design of two sets of high-precision internal tooth-shaped sleeves, this fixture reduces the number of precision-machined parts, significantly reducing the difficulty and cost of tooling manufacturing.

[0041] After the planetary shaft gear 1 and planetary disk gear 2 are assembled, the symmetry of the tooth grooves can be adjusted using this device, which can reduce the wear between the planetary shaft gear 1 and planetary disk gear 2 and the positioning cylindrical pin 9, and extend the service life of the fixture.

[0042] By using adjusting screws to drive the positioning slider 5 and adjusting slider 6 to move radially along the fixed shaft 3, the contact state between the positioning cylindrical pin 9 and the tooth profile of the double planetary gear can be precisely controlled. When there is a deviation in tooth groove symmetry between the planetary disk gear 2 and the planetary shaft gear 1, by rotating the planetary disk gear 2 and observing the contact between the positioning cylindrical pin 9 and the tooth profiles on both sides of the tooth groove, it is possible to intuitively and accurately adjust to a symmetrical position, ensuring that the double planetary gear meets the strict symmetry requirements for meshing, thereby improving machining accuracy and product reliability.

[0043] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A fixture for machining a double planetary gear in a single-stage coaxial reducer, wherein the double planetary gear comprises a planetary shaft gear and a planetary disk gear, characterized in that: The fixture includes a fixed shaft, a fixture base, a positioning slider, and an adjusting slider; The fixed shaft is vertically fixed on the fixture seat, the planetary shaft gear is sleeved on the fixed shaft, and the planetary disk gear is sleeved on the planetary shaft gear; The fixture seat has a receiving cavity, and the positioning slider and the adjusting slider are slidably connected in the receiving cavity. The adjusting slider is disposed above the positioning slider, so that the planetary shaft gear corresponds to the positioning slider and the planetary disk gear corresponds to the adjusting slider. The fixture base is also connected to a sliding assembly that drives the positioning slider and the adjusting slider to slide respectively; The positioning slider and the adjusting slider are each connected to a positioning cylindrical pin, and the axes of the two positioning cylindrical pins are located on the same straight line along the sliding direction of the positioning slider and the adjusting slider. The sliding component drives the two positioning cylindrical pins to embed into the tooth grooves of the planetary shaft gear and the planetary shaft gear respectively, and to contact the tooth profile.

2. The fixture for machining double planetary gears of a single-stage coaxial reducer as described in claim 1, characterized in that: Both of the sliding components are adjusting screws, and the two adjusting screws are respectively threaded to the clamp seat, with one adjusting screw abutting against the positioning slider and the other adjusting screw abutting against the adjustment slider.

3. The fixture for machining double planetary gears of a single-stage coaxial reducer as described in claim 1, characterized in that: The fixture base includes a base plate, a top plate, side plates, and a back plate. The fixed shaft is fixedly connected to the base plate. The back plate is located at the end of the base plate away from the fixed shaft. The top plate is fixed to the upper end of the back plate by screws. The positioning slider and the adjusting slider are located between the top plate and the base plate. The side plates are fixed to both sides of the base plate, and the upper end of the side plates extends to the top plate and is connected to the top plate by screws.

4. The fixture for machining double planetary gears of a single-stage coaxial reducer as described in claim 1, characterized in that: The positioning slider has a first clearance groove on the side near the planetary shaft gear, and the adjusting slider has a second clearance groove on the side near the planetary disk gear.

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