Zero tooth profile alignment device and pressing method for helical tooth double gear

Abstract

This invention discloses a zero-position tooth profile alignment device and pressing method for helical double gears, including a base. A column for positioning a small gear is provided at the upper end of the base. A large gear is sleeved on the outer side of the small gear. A first guide seat and a second guide seat are respectively provided on the outer side of the column. A first tooth profile positioning pin and a second tooth profile positioning pin are horizontally arranged inside the first and second guide seats, respectively. The central axis of the first tooth profile positioning pin coincides with the upper end face of the large gear, and the central axis of the second tooth profile positioning pin coincides with the upper end face of the column. This helical double gear zero-position tooth profile alignment device and pressing method can improve the pressing accuracy of the double gear, and the double gear remains stable during the pressing process, thus improving the stability of the pressing process.

Description

Technical Field

[0001] This invention relates to the field of gear processing technology, specifically to a zero-position tooth profile alignment device and pressing method for helical double gears. Background Technology

[0002] To meet the transmission requirements of the mechanism, the double gears used for transmission need to ensure transmission capacity and the relative angle between the large and small gears. The interference fit is relatively large, and the interference fit is usually completed by press fitting. The common method is to heat the large gear and cool the small gear, and use the gap generated by thermal expansion and contraction to achieve press fitting.

[0003] Existing double-gear press-fitting methods mostly use engraved lines to control the angle and rely on visual inspection for alignment. This method has low precision and cannot meet our requirements. The existing patent (CN111300010A) for a precise gear-aligning device and method for press-fitting an engine intermediate gear has the following shortcomings: when the press starts working, the positioning pin needs to be disengaged from the tooth groove, and the pressing angle is controlled by visual inspection of the engraved lines. This results in a lack of precise positioning during the pressing process, leading to low relative angular accuracy of the press-fitted double gears. Another patent (CN102357846A) describes a press-fitting fixture and method for double helical gears. Its main shortcomings are: the large gear loses its center positioning during the pressing process, and the "0" position positioning of the large gear requires conversion, resulting in a large positioning error. Furthermore, the pressing operation of the pressure plate is time-consuming and inconvenient, and the positioning of the elastic positioning pin is unstable. There is still room for improvement. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a zero-position tooth profile alignment device and pressing method for helical double gears, which can improve the pressing accuracy of double gears and keep the double gears in a stable state during the pressing process, thus effectively solving the problems in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a helical double gear zero-position tooth profile alignment device, comprising a base, a column for positioning a small gear is provided at the upper end of the base, a large gear is sleeved on the outer side of the small gear, a first guide seat and a second guide seat are respectively provided on the outer side of the column, a first tooth profile positioning pin and a second tooth profile positioning pin are respectively horizontally arranged in the first guide seat and the second guide seat, the central axis of the first tooth profile positioning pin coincides with the upper end face of the large gear, and the central axis of the second tooth profile positioning pin coincides with the upper end face of the column.

[0006] As a preferred embodiment of the present invention, the front end profile dimensions of the first toothed positioning pin and the second toothed positioning pin are respectively matched with the involute dimensions of the large gear and the small gear.

[0007] As a preferred embodiment of the present invention, the included angle between the central axes of the first toothed positioning pin and the second toothed positioning pin is A, where A is the relative angle between the zero positions of the large gear and the small gear.

[0008] As a preferred embodiment of the present invention, a first guide sleeve and a second guide sleeve are respectively provided in the first guide seat and the second guide seat, and the first toothed positioning pin and the second toothed positioning pin are respectively located in the first guide sleeve and the second guide sleeve.

[0009] As a preferred embodiment of the present invention, both the first guide seat and the second guide seat are provided with locking screws.

[0010] A pressing method for a zero-position tooth profile alignment device for helical double gears includes the following steps:

[0011] S1: Cool the pinion. Place the pinion on the column. After aligning it to the zero position, push the second toothed positioning pin to position it. Once the positioning is reliable, tighten the locking screw.

[0012] S2: Take out the heated large gear, use the gap created by thermal expansion to correctly place the large gear on the stepped circle and end face of the small gear, rotate to adjust the zero position of the large gear, and position and hold it by the first tooth-shaped positioning pin;

[0013] S3: Pressing is complete, and the entire assembly is removed.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the zero-position tooth profile positioning device and pressing method of this helical double gear uses a first tooth profile positioning pin to position the large gear and a second tooth profile positioning pin to position the small gear before pressing. During the pressing process, the first tooth profile positioning pin and the second tooth profile positioning pin always remain in a fixed state to ensure pressing accuracy. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main cross-section of the present invention;

[0016] Figure 2 This is a top view of the present invention.

[0017] In the figure: 1 First guide sleeve, 2 First toothed positioning pin, 3 Locking screw, 4 Second guide sleeve, 5 First guide seat, 6 Base, 7 Column, 8 Second toothed positioning pin, 9 Second guide seat. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments (for ease of description and understanding, the following refers to...). Figure 1(The above is described above). Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0019] Please see Figure 1-2 This invention provides a technical solution: a zero-position tooth profile alignment device for a helical double gear, comprising a base 6, a column 7 for positioning a pinion at the upper end of the base 6, a large gear sleeved on the outer side of the pinion, a first guide seat 5 and a second guide seat 9 respectively provided on the outer side of the column 7, a first tooth profile positioning pin 2 and a second tooth profile positioning pin 8 respectively horizontally arranged inside the first guide seat 5 and the second guide seat 9, the central axis of the first tooth profile positioning pin 2 coincides with the upper end face of the large gear, the central axis of the second tooth profile positioning pin 8 coincides with the upper end face of the column 7, and the included angle of the central axes of the first tooth profile positioning pin 2 and the second tooth profile positioning pin 8 is A, where A is the relative angle between the zero positions of the large gear and the pinion.

[0020] To ensure stable positioning, the front end profile dimensions of the first toothed positioning pin 2 and the second toothed positioning pin 8 are respectively matched with the involute dimensions of the large gear and the small gear.

[0021] In order to ensure that the first toothed positioning pin 2 and the second toothed positioning pin 8 remain horizontal during the movement process, improve positioning accuracy, and avoid positioning deviation, the first guide seat 5 and the second guide seat 9 are respectively provided with the first guide sleeve 1 and the second guide sleeve 4, and the first toothed positioning pin 2 and the second toothed positioning pin 8 are respectively located in the first guide sleeve 1 and the second guide sleeve 4.

[0022] To prevent wobbling during press-fitting after the first toothed locating pin 2 and the second toothed locating pin 8 are locked onto the corresponding gears, locking screws 3 are provided on both the first guide seat 5 and the second guide seat 9.

[0023] A pressing method for a zero-position tooth profile alignment device for helical double gears includes the following steps:

[0024] S1: Cool the pinion. Place the pinion on the column 7, align it to the zero position, and push the second toothed positioning pin 8 to position it. After the positioning is reliable, tighten the locking screw 3.

[0025] S2: Take out the heated large gear, use the gap created by thermal expansion to correctly place the large gear on the stepped circle and end face of the small gear, rotate and adjust the zero position of the large gear, and position and hold it by the first tooth-shaped positioning pin 2;

[0026] S3: Pressing is complete, and the entire assembly is removed.

[0027] This invention can accurately position helical double gears during the press-fitting process, ensuring the accuracy of the relative angle A of the double gears. Furthermore, under the action of the first tooth-shaped positioning pin 2 and the second tooth-shaped positioning pin 8, the positioning error is greatly reduced, ensuring that the positioning element remains in a fixed state, making the press-fitting process reliable and stable.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A zero-position tooth profile alignment device for helical double gears, comprising a base (6), characterized in that: The upper end of the base (6) is provided with a column (7) for positioning the small gear. The outer side of the small gear is sleeved with a large gear. The outer side of the column (7) is provided with a first guide seat (5) and a second guide seat (9). The first guide seat (5) and the second guide seat (9) are respectively horizontally provided with a first toothed positioning pin (2) and a second toothed positioning pin (8). The central axis of the first toothed positioning pin (2) coincides with the upper end face of the large gear, and the central axis of the second toothed positioning pin (8) coincides with the upper end face of the column (7).

2. The zero-position tooth profile alignment device for helical double gears according to claim 1, characterized in that: The front end profile dimensions of the first toothed positioning pin (2) and the second toothed positioning pin (8) are respectively matched with the involute dimensions of the large gear and the small gear.

3. The zero-position tooth profile alignment device for helical double gears according to claim 1, characterized in that: The included angle between the central axes of the first toothed positioning pin (2) and the second toothed positioning pin (8) is A, where A is the relative angle between the zero positions of the large gear and the small gear.

4. The zero-position tooth profile alignment device for helical double gears according to claim 1, characterized in that: The first guide seat (5) and the second guide seat (9) are respectively provided with a first guide sleeve (1) and a second guide sleeve (4), and the first toothed positioning pin (2) and the second toothed positioning pin (8) are respectively located in the first guide sleeve (1) and the second guide sleeve (4).

5. The zero-position tooth profile alignment device for helical double gears according to claim 1, characterized in that: Locking screws (3) are provided on both the first guide seat (5) and the second guide seat (9).

6. The pressing method for a helical double gear zero-position tooth profile matching device according to claim 1, characterized in that: Includes the following steps: S1: Cool the pinion, place the pinion on the column (7), push the second toothed positioning pin (8) to position it after aligning it to the zero position, and tighten the locking screw (3) after the positioning is reliable. S2: Take out the heated large gear, use the thermal expansion to create a gap, place the large gear correctly on the stepped circle and end face of the small gear, rotate to adjust the zero position of the large gear, and position and hold it by the first tooth-shaped positioning pin (2); S3: Pressing is complete, and the entire assembly is removed.

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