Differential gear mounting distance testing fixture

Abstract

The utility model belongs to differential mechanism detection technical field, concretely relates to a differential mechanism gear installation distance gauge. The specific technical scheme is: including base body, mandrel and with base body adaptation's limit cover, limit cover lower surface is provided with annular limit portion, base body upper surface is provided with annular convex portion, the clearance fit between annular convex portion outer circle part and annular limit portion inner circle part;Base body upper surface is provided with annular groove, and the vertical section of annular groove is arc shape;Along annular limit portion axis direction, limit cover is provided with first through -hole;Annular groove is provided with a plurality of steel balls, and when detecting, steel ball and first through -hole inboard wall are in contact, and are located in gear tooth slot.

Description

Technical Field

[0001] This utility model belongs to the field of differential testing technology, specifically relating to a differential gear mounting distance gauge. Background Technology

[0002] In a differential transmission system, the gears used include planetary gears and axle gears. The mounting distance of a planetary gear is the distance from the center of its sphere to the cone point of the bevel gear, and the mounting distance of an axle gear is the distance from its mounting plane to the cone point of the bevel gear.

[0003] In the prior art, patent application number 2019214224025, entitled "A gauge for detecting the mounting distance of planetary gears in a differential," discloses a standard plate, a gear mold base, a spherical cover, a positioning mandrel, and a planetary gear to be tested. The gear mold base is set on the standard plate, and a through hole one for mounting the positioning mandrel is provided in the middle of the gear mold base. The upper part of the gear mold base has a tooth groove, and the teeth of the planetary gear to be tested are adapted to and abut against the tooth groove. The upper part of the gear to be tested is provided with a spherical cover, and a through hole two is provided in the middle of the spherical cover. A spherical surface is provided at the two-dimensional center of the through hole on the lower part of the spherical cover, and the spherical surface is adapted to the spherical surface on the upper part of the planetary gear to be tested. The lower part of the positioning mandrel passes through the through hole two, and the planetary gear to be tested is set in the through hole one. This gauge has the following problems: the number and shape of the tooth grooves on the upper part of the gear mold base are consistent, and one gauge can only detect one size of planetary gear, and cannot detect gears of different sizes. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a differential gear mounting distance gauge that can simultaneously detect the planetary gear mounting distance and the half-shaft gear mounting distance.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows: a differential gear mounting distance inspection tool, comprising a base body, a spindle, and a limiting cover plate adapted to the base body. The upper part of the spindle is adapted to the mounting hole of the gear, and the base body is provided with a second through hole adapted to the lower part of the spindle. The lower surface of the limiting cover plate is provided with an annular limiting part, and the upper surface of the base body is provided with an annular protrusion. The outer circle of the annular protrusion and the inner circle of the annular limiting part are clearance-fitted. The upper surface of the base body is provided with an annular groove, and the vertical cross-section of the annular groove is arc-shaped. Along the axial direction of the annular limiting part, the limiting cover plate is provided with a first through hole. Several steel balls are provided in the annular groove. During inspection, the steel balls abut against the inner wall of the first through hole and are located in the gear tooth groove.

[0006] Preferably, the number of steel balls is greater than or equal to 3.

[0007] Preferably, along the circumferential direction of the first through hole, a plurality of serrations are spaced apart on the inner sidewall of the first through hole, and a steel ball is disposed between two adjacent serrations.

[0008] Preferably, the number of saw teeth is the same as the number of gear teeth.

[0009] Preferably, the base body includes a dial indicator base and a limiting plate. The upper surface of the dial indicator base is provided with a limiting groove that is adapted to the limiting plate. The annular groove is provided on the upper surface of the limiting plate, and the upper surface of the limiting plate is flush with the annular protrusion.

[0010] Preferably, the lower surface of the limiting plate has a planar structure.

[0011] Preferably, the gauge further includes a dial indicator cover and a testing instrument. The dial indicator cover includes a positioning shaft portion adapted to the gear mounting hole and an annular portion that contacts the spherical surface of the gear. The annular portion is coaxial with the positioning shaft portion. Along the axial direction of the positioning shaft portion, the dial indicator cover is provided with a third through hole. The third through hole is adapted to the dial indicator rod of the testing instrument and is locked with screws.

[0012] Preferably, the testing instrument is a dial indicator or a micrometer.

[0013] Preferably, an annular block is provided at the lower end of the mandrel, and stepped grooves adapted to the annular block are provided on the inner sidewall of the second through hole and on the dial indicator base.

[0014] This utility model has the following beneficial effects:

[0015] 1. By setting an annular limiting part on the lower surface of the limiting cover plate and an annular protrusion on the upper surface of the base body, the inner circle of the annular limiting part and the outer circle of the annular protrusion are clearance-fitted. An annular groove is set on the upper surface of the base body, and several steel balls are set in the annular groove. During the test, the steel balls abut against the inner sidewall of the first through hole and are located in the gear tooth groove. The number of steel balls is set according to the number of gear teeth. The number of steel balls is greater than or equal to 3, which can be used to test gears with different numbers of teeth, thus improving the applicability of the inspection tool.

[0016] 2. The gear being tested is supported by steel balls, making it suitable for gears with the same number of teeth and similar tooth space widths, thus broadening its application range. Using steel ball support ensures point contact between the steel ball and the tooth surface, allowing for precise adjustment of the contact point to the position with the highest tooth surface accuracy, guaranteeing minimal measurement error and good consistency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the inspection tool of this utility model;

[0018] Figure 2 This is a cross-sectional schematic diagram of the dial indicator base of this utility model;

[0019] Figure 3 This is a top view of the limiting cover plate of this utility model;

[0020] Figure 4 This is a cross-sectional schematic diagram of the limiting cover plate of this utility model;

[0021] Figure 5 This is a cross-sectional schematic diagram of the limiting plate of this utility model;

[0022] Figure 6 This is a physical image of the inspection tool of this utility model.

[0023] In the diagram: 1. Dial plate holder; 2. Spindle; 3. Limiting plate; 4. Steel ball; 5. Limiting cover; 6. Annular limiting part; 7. Annular protrusion; 8. Limiting groove; 9. Annular block; 10. Second through hole; 11. Stepped groove; 12. Gear; 13. Mounting hole; 14. Annular part; 15. Dial plate cover; 16. Third through hole; 17. Positioning shaft; 18. Screw; 19. Dial rod; 20. Detection instrument; 21. Sawtooth; 22. First through hole; 23. Annular groove. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0025] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] like Figures 1-5 As shown, this application discloses a differential gear mounting distance gauge. Figure 1The diagram shows a planetary gear mounting distance detection system, including a base body, a spindle 2, and a limiting cover 5 adapted to the base body. The limiting cover 5 is located on the upper part of the base body. The upper part of the spindle 2 is adapted to the mounting hole 13 of the gear 12. The base body has a second through hole 10 adapted to the lower part of the spindle 2. The lower surface of the limiting cover 5 has an annular limiting part 6, and the upper surface of the base body has an annular protrusion 7. The outer circle of the annular protrusion 7 is clearance-fitted with the inner circle of the annular limiting part 6. The upper surface of the base body has an annular groove 23. The vertical cross-section is arc-shaped; along the axial direction of the annular limiting part 6, the limiting cover plate 5 is provided with a first through hole 22, which allows the mandrel 2 to pass through and is adapted to the toothed end of the gear 12; with the axis of the mandrel 2 as the reference, from the inside to the outside, an annular groove 23, an annular protrusion 7, and an annular limiting part 6 are arranged in sequence; the annular groove 23 is arranged between the mandrel 2 and the inner sidewall of the first through hole 22, and a number of steel balls 4 are arranged in the annular groove 23. The number of steel balls 4 is greater than or equal to 3, and the steel balls 4 are randomly and arbitrarily distributed in the circumferential direction of the gear 12 to ensure that the gear 12 can be placed flat after being placed on it.

[0027] It is easy to understand that the steel ball 4 can slide freely along the circumference of the annular groove 23. When the gear 12 is placed on the steel ball 4, the steel ball 4 can move radially within the annular groove 23 under the influence of the gear 12's gravity until it contacts the inner wall of the first through hole 22. The radius of the arc of the vertical section of the annular groove 23 is designed according to the weight of the gear 12, ensuring that the weight of the gear 12 can push the steel ball 4 to move radially along the annular groove 23 after it is placed on the steel ball 4.

[0028] During testing, gear 12 is placed on the fixture. Specifically, the lower part of the mandrel 2 is inserted into the second through hole 10, and then gear 12 is placed in so that the upper part of the mandrel 2 is inserted into the gear 12 mounting hole 13. When gear 12 is placed in, the steel ball 4 is positioned within the tooth groove of gear 12, and the tooth surface of gear 12 contacts the steel ball 4. Under the influence of the gravity of gear 12, the steel ball 4 can move radially within the annular groove 23 until it contacts the inner wall of the first through hole 22. The height of the testing instrument 20 is adjusted so that the meter head of the testing instrument 20 contacts the upper end face of the mandrel 2. The testing instrument 20 is then locked, and testing begins. During testing, the first through hole 22, the second through hole 10, the annular groove 23, the annular protrusion 7, the annular limiting part 6, and the gear 12 mounting hole 13 are arranged in the same axial direction.

[0029] In a preferred embodiment, in order to better support the gear 12, the number of steel balls 4 is the same as the number of teeth of the gear 12. During testing, there is one steel ball 4 corresponding to each tooth groove of the gear 12.

[0030] In a further embodiment, since the steel balls 4 move circumferentially within the annular groove 23, to prevent several steel balls 4 from sliding together and becoming difficult to place into the gear 12 tooth groove, several serrations 21 are spaced apart on the inner wall of the first through hole 22 along its circumference. A steel ball 4 is placed between two adjacent serrations 21 to prevent several steel balls 4 from piling up. In a preferred embodiment, the number of serrations 21 is the same as the number of teeth of the gear 12 and the number of steel balls 4.

[0031] In a further embodiment, the base body includes a dial indicator base 1 and a limiting plate 3. The upper surface of the dial indicator base 1 is provided with a limiting groove 8 that matches the limiting plate 3. The limiting plate 3 and the limiting groove 8 are circular in shape. The outer circle of the limiting plate 3 and the inner circle of the limiting groove 8 are in clearance fit. The annular groove 23 is provided on the upper surface of the limiting plate 3, and the upper surface of the limiting plate 3 is flush with the upper surface of the annular protrusion 7. The lower surface of the limiting plate 3 is planar. A second through hole 10 is provided through the dial indicator base 1 and the limiting plate 3. It should be noted that the outer diameter of the limiting plate 3 is larger than the diameter of the first through hole 22, so that the limiting cover plate 5 can press down on the limiting plate 3.

[0032] In a further embodiment, the gauge also includes a dial indicator cover 15 and a measuring instrument 20. The dial indicator cover 15 includes a positioning shaft portion 17 adapted to the mounting hole 13 of the gear 12 and an annular portion 14 in spherical contact with the gear 12. The annular portion 14 is coaxial with the positioning shaft portion 17. Along the axial direction of the positioning shaft portion 17, the dial indicator cover 15 is provided with a third through hole 16, which is adapted to the dial indicator rod 19 of the measuring instrument 20 and locked by an internal hexagonal socket head cap screw 18. The measuring instrument 20 can be a dial indicator or a micrometer indicator.

[0033] In a further embodiment, an annular block 9 is provided at the lower end of the mandrel 2, and a stepped groove 11 adapted to the annular block 9 is provided on the inner side wall of the second through hole 10 and on the dial indicator base 1. By providing the annular block 9 and the stepped groove 11, the position of the mandrel 2 on the dial indicator base 1 is restricted.

[0034] The working principle of a differential gear mounting distance inspection tool: The outer circle of the annular protrusion 7 on the indicator base 1 is intermittently fitted with the inner circle of the annular limiting part 6 on the limiting cover plate 5. The fitting clearance is generally 0.01-0.02 mm, but other fitting clearances can also be selected. The outer circle of the limiting plate 3 is clearance fitted with the inner circle of the limiting groove 8. The fitting clearance is generally 0.01-0.02 mm, but other fitting clearances can also be selected. An annular groove 23 is provided on the upper surface of the limiting plate 3. The steel ball 4 can slide freely in the annular groove 23 along the circumferential direction. When the gear 12 is placed into the steel ball 4, the steel ball 4 can move radially in the annular groove 23 under the action of the gravity of the gear 12. The inner sidewall of the first through hole 22 of the limiting cover plate 5 is provided with several serrations 21 in the circumferential direction. The number of serrations 21 is the same as the number of teeth of the gear 12. The purpose is to limit the position of the steel ball 4 in the circumferential direction in the annular groove 23 and prevent the steel ball 4 from sliding together for easy inspection. The inner diameter of the first through hole 22 is determined according to the contact position requirements between the steel ball 4 and the gear tooth surface 12. The lower end of the spindle 2 is interference-fitted with the dial indicator base 1, and the upper end of the spindle 2 is clearance-fitted with the gear 12 mounting hole 13. The lower end of the dial indicator cover 15 is clearance-fitted with the gear 12 mounting hole 13, and the upper end of the dial indicator cover 15 is clearance-fitted with the dial indicator rod 19 of the measuring instrument 20. The measuring instrument 20 is fixed by the hexagon socket head cap screw 18. The annular part 14 of the dial indicator cover 15 is in contact with the spherical surface of the gear 12, and the diameter of the annular part 14 is determined according to the diameter of the measurement position.

[0035] During measurement, the standard gear 12 is placed into the fixture, so that the tooth surface of the standard gear 12 contacts the steel ball 4. The measuring instrument 20 is adjusted so that the meter head of the measuring instrument 20 contacts the top of the mandrel 2. The internal hexagonal screw 18 is tightened, and the dial of the measuring instrument 20 is rotated so that the pointer is calibrated to 0. During measurement, the calibration gear 12 is removed, the gear 12 to be tested is placed in, the reading of the measuring instrument pointer is compared with the technical requirements, and the test is completed.

[0036] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Any modifications, alterations, alterations, or substitutions made by those skilled in the art to the technical solutions of the present utility model without departing from the spirit of the present utility model shall fall within the protection scope defined by the claims of the present utility model.

Claims

1. A differential gear mounting distance gauge, characterized in that: The device includes a base body, a spindle (2), and a limiting cover plate (5) adapted to the base body. The upper part of the spindle (2) is adapted to the mounting hole (13) of the gear (12). The base body is provided with a second through hole (10) adapted to the lower part of the spindle (2). The lower surface of the limiting cover plate (5) is provided with an annular limiting part (6). The upper surface of the base body is provided with an annular protrusion (7). The outer circle of the annular protrusion (7) is clearance-fitted with the inner circle of the annular limiting part (6). The upper surface of the base body is provided with an annular groove (23). The vertical cross section of the annular groove (23) is arc-shaped. Along the axial direction of the annular limiting part (6), the limiting cover plate (5) is provided with a first through hole (22). Several steel balls (4) are provided in the annular groove (23). During testing, the steel balls (4) abut against the inner sidewall of the first through hole (22) and are located in the tooth groove of the gear (12).

2. The differential gear mounting distance gauge according to claim 1, characterized in that: The number of steel balls (4) is greater than or equal to 3.

3. A differential gear mounting distance gauge according to claim 2, characterized in that: Along the circumferential direction of the first through hole (22), a plurality of serrations (21) are provided at intervals on the inner sidewall of the first through hole (22), and the steel ball (4) is provided between two adjacent serrations (21).

4. A differential gear mounting distance gauge according to claim 3, characterized in that: The number of saw teeth (21) is the same as the number of teeth of gear (12).

5. A differential gear mounting distance gauge according to claim 4, characterized in that: The base body includes a dial indicator base (1) and a limiting plate (3). The upper surface of the dial indicator base (1) is provided with a limiting groove (8) that is adapted to the limiting plate (3). The annular groove (23) is provided on the upper surface of the limiting plate (3). The upper surface of the limiting plate (3) is flush with the annular protrusion (7).

6. A differential gear mounting distance gauge according to claim 5, characterized in that: The lower surface of the limiting plate (3) is a planar structure.

7. A differential gear mounting distance gauge according to claim 5, characterized in that: The gauge also includes a dial indicator cover (15) and a testing instrument (20). The dial indicator cover (15) includes a positioning shaft portion (17) adapted to the mounting hole (13) of the gear (12) and an annular portion (14) in spherical contact with the gear (12). The annular portion (14) is coaxial with the positioning shaft portion (17). Along the axial direction of the positioning shaft portion (17), the dial indicator cover (15) is provided with a third through hole (16). The third through hole (16) is adapted to the dial indicator rod (19) of the testing instrument (20) and is locked by a screw (18).

8. A differential gear mounting distance gauge according to claim 7, characterized in that: The testing instrument (20) is a dial indicator or a micrometer.

9. A differential gear mounting distance gauge according to claim 7, characterized in that: The lower end of the mandrel (2) is provided with an annular block (9), and the inner wall of the second through hole (10) and the dial indicator base (1) are provided with stepped grooves (11) that are adapted to the annular block (9).

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