Balance shaft tooth angle testing fixture

Abstract

The utility model belongs to the balance shaft detection technical field, and specifically discloses a balance shaft tooth angle detection tool comprising a base plate, a first fixing seat, a second fixing seat and a detection device, the first fixing seat and the second fixing seat are fixed on the base plate, and a balance shaft assembly is arranged between the first fixing seat and the second fixing seat; the balance shaft assembly comprises a shaft body and a detection annular protrusion arranged on the shaft body, a key groove is formed in the edge of the detection annular protrusion, and a detection block is connected to the key groove in a clamped mode. A transmission gear is further included, a positioning groove is formed in the transmission gear, and a positioning pin is arranged on the second fixing base. The included angle between the key groove and the positioning groove is fixed, two detection marking lines parallel to the shaft body are arranged on the detection block, and the detection device detects the installation angle deviation between the key groove and the positioning groove by measuring the height difference of the two detection marking lines. The device is simple in structure, convenient to detect, high in measurement precision, good in applicability and strong in practicability, and the working efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of balance shaft detection, in particular to a balance shaft tooth angle detection tool. Background Art

[0002] The balance shaft is a mechanical structure widely used in motorcycle and automobile engines. It is used to balance and reduce the periodic vibration and noise generated by the operation of the engine crankshaft. It is an eccentric structure. After being assembled at the bottom of the engine, it can rotate synchronously with the crankshaft. The reverse vibration force generated by its eccentric weight can make the engine well balanced and reduce the noise of the engine. At present, the balance shaft on the market mainly includes a shaft body, an eccentric weight and an annular limit protrusion. The eccentric weight and the annular limit protrusion are both set on the shaft body. The eccentric weight is a key component. Its center of mass deviates from the axis of the balance shaft and generates reverse vibration force through rotation. The annular limit protrusion can ensure the precise positioning of the balance shaft during operation to prevent it from being offset or misaligned. This design helps to improve the stability and reliability of the mechanical system; it can limit the range of movement of the balance shaft in certain directions, thereby protecting other components in the mechanical system from unnecessary impact or damage.

[0003] When assembling the balance shaft, a transmission gear is needed to connect the shaft to the crankshaft, so as to transmit the rotational power of the crankshaft to the balance shaft. In order to ensure that the balance shaft can play a good balancing role, it is also necessary to ensure that the eccentric weight on the balance shaft matches the transmission gear angle, so as to ensure the balance of the balance shaft and reduce the vibration of the crankshaft. If the angle deviation between the eccentric weight of the balance shaft and the transmission gear is too large, it will not only fail to balance the vibration of the crankshaft, but will increase the vibration and noise of the engine. This requires measuring the angle between the eccentric weight and the transmission gear to ensure that the angle matches within the error range.

[0004] The existing method of measuring the angle between the eccentric weight and the transmission gear is usually to use an angle measuring instrument to measure. During the measurement, the reference surface of the angle measuring instrument is closely fitted with the measured component (such as a fixed surface of the balance shaft or the transmission gear) to ensure the accuracy of the measurement reference, and then the probe of the measuring instrument is adjusted to make it contact with another measured component (such as the other end face of the transmission gear or a reference surface of the balance shaft), and the measurement value is recorded. Although the above method can measure the installation angle between the eccentric weight and the transmission gear, the above operation process is relatively cumbersome, the work efficiency is low, and it depends on the operator's measurement technique, and the measurement accuracy is easily affected. Utility Model Content

[0005] The utility model aims to provide a balancing shaft tooth angle measuring tool, which has a simple structure, is easy to detect, greatly improves work efficiency, and has high measurement accuracy, good applicability and strong practicability.

[0006] The technical solution adopted by the utility model to solve its technical problems is as follows:

[0007] A balance shaft tooth angle inspection tool, comprising a bottom plate, a first fixed seat, a second fixed seat and a detection device. The first fixed seat and the second fixed seat are both fixed on the bottom plate, and a balance shaft assembly is arranged between the first fixed seat and the second fixed seat;

[0008] The balance shaft assembly includes a shaft body and a detection annular protrusion arranged on the shaft body. A key groove is formed on the edge of the detection annular protrusion, and a detection block is clamped on the key groove;

[0009] The balance shaft assembly further includes a transmission gear arranged at one end of the shaft body. One of the tooth grooves on the transmission gear is used as a positioning groove, and a positioning pin matched with the positioning groove is arranged on the second fixed seat;

[0010] The included angle between the key groove and the positioning groove is fixed and unchanged. Two detection marking lines parallel to the shaft body are arranged on the detection block. The detection device measures the height difference between the two detection marking lines, so as to realize the detection of the angle deviation between the key groove and the positioning groove.

[0011] Further, the detection device includes a meter base and a support rod vertically fixed on the meter base; it also includes a cross arm. One end of the cross arm is provided with a sliding through hole, and the other end is provided with a measuring meter. The support rod penetrates through the sliding through hole, and a locking piece is also arranged at the position of the sliding through hole of the cross arm; the measuring rod of the detection meter is vertically arranged, and the measuring head of the measuring meter contacts the detection block. By pushing the meter base, the measuring head is driven to slide between the two detection marking lines on the detection block to realize the measurement of the height difference between the two detection marking lines, so as to realize the detection of the angle deviation between the key groove and the positioning groove.

[0012] Further, a cylinder is fixedly connected to the first fixed seat through a connecting sleeve; the output shaft of the cylinder is horizontally arranged, and the end is fixedly connected with a first fixed cylinder body. The first fixed cylinder body penetrates through the first fixed seat and abuts against one end of the shaft body; a first sleeve is also sleeved outside the first fixed cylinder body, and the first sleeve is fixed on the first fixed seat. The first fixed cylinder body can slide in the first sleeve;

[0013] A second fixed cylinder body is horizontally fixed on the second fixed seat, and the second fixed cylinder body abuts against the other end of the shaft body;

[0014] Both ends of the shaft body are recessed inward to form abutting grooves, and the ends of the first fixed cylinder body and the second fixed cylinder body are matched with the shapes of the abutting grooves.

[0015] Further, a guide rod penetrating through the second fixed seat is arranged on the second fixed seat. The positioning pin is fixed at the end of the guide rod. A second sleeve is also sleeved outside the guide rod, and the second sleeve is fixed on the second fixed seat. The guide rod can slide in the second sleeve.

[0016] Further, a marking hole is also provided in the positioning groove.

[0017] Further, the distance between two detection marking lines on the detection block is 20 - 40 mm.

[0018] Further, the balance shaft assembly further includes an eccentric weight block and an annular limiting protrusion provided on the shaft body.

[0019] The beneficial effects of the present utility model are as follows: The device of the present utility model can convert the angle measurement between the eccentric weight block and the transmission gear into a more convenient height difference measurement. It not only has simple operation, greatly improves work efficiency, but also has high measurement accuracy, good applicability and strong practicability. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will further illustrate the present utility model in conjunction with the drawings and embodiments. The drawings in the following description are only partial embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings:

[0021] Figure 1 is an overall structural schematic diagram of the present utility model.

[0022] Figure 2 is a top - view structural schematic diagram of the present utility model.

[0023] Figure 3 is Figure 2 a sectional structural schematic diagram along the A - A plane in

[0024] Figure 4 is a front - view structural schematic diagram of the present utility model.

[0025] Figure 5 is a side - view structural schematic diagram of the present utility model in the figure.

[0026] Figure 6 is an overall structural schematic diagram of the shaft body of the present utility model.

[0027] Figure 7 is a structural schematic diagram of the balance assembly of the present utility model.

[0028] In the figure: 1. Bottom plate; 2. First fixing seat; 3. Second fixing seat; 4. Shaft body; 5. Detection annular protrusion; 6. Keyway; 7. Detection block; 8. Driving gear; 9. Positioning groove; 10. Positioning pin; 11. Detection marking line; 12. Gauge block; 13. Support rod; 14. Cross arm; 15. Measuring gauge; 16. Locking piece; 17. Measuring rod; 18. Measuring head; 19. Connecting sleeve; 20. Cylinder; 21. First fixing cylinder; 22. Second fixing cylinder; 23. First sleeve; 24. Second sleeve; 25. Abutting groove; 26. Guide rod; 27. Marking hole; 28. Eccentric weight; 29. Annular limiting protrusion. Detailed implementation manners

[0029] In order to make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below. Apparently, the described embodiments are partial embodiments of the present utility model rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0030] As Figures 1 to 7 shown, a balance shaft tooth angle inspection tool includes a bottom plate 1, a first fixing seat 2, a second fixing seat 3 and a detection device. The first fixing seat 2 and the second fixing seat 3 are both fixed on the bottom plate 1, and a balance shaft assembly is arranged between the first fixing seat 2 and the second fixing seat 3;

[0031] The balance shaft assembly includes a shaft body 4 and a detection annular protrusion 5 arranged on the shaft body 4. A keyway 6 is formed on the edge of the detection annular protrusion 5, and a detection block 7 is clamped on the keyway 6;

[0032] The balance shaft assembly further includes a driving gear 8 arranged at one end of the shaft body 4. One of the tooth grooves on the driving gear 8 is used as a positioning groove 9, and a positioning pin 10 matched with the positioning groove 9 is arranged on the second fixing seat 3;

[0033] The included angle between the keyway 6 and the positioning groove 9 is fixed and unchanged. Two detection marking lines 11 parallel to the shaft body 4 are arranged on the detection block 7. The detection device detects the height difference between the two detection marking lines 11, so as to realize the detection of the angle deviation between the keyway 6 and the positioning groove 9.

[0034] The angle checker for the balance shaft teeth of the present utility model is mainly used to detect the angular deviation between the eccentric weight block 28 and the transmission gear 8. Among them, the keyway 6 on the detection annular protrusion 5 is a rectangular groove, and the detection block 7 is inserted into the keyway 6 along the radial direction of the detection annular protrusion 5. To ensure more accurate measurement, in the present utility model, the center line of the keyway 6 along the radial direction of the detection annular protrusion 5 (hereinafter referred to as the radial center line of the keyway 6) is parallel to the center line of the radial direction of the eccentric weight block 28 (hereinafter referred to as the radial center line of the eccentric weight block 28). This structure can ensure that the radial center line of the keyway 6, the radial center line of the eccentric weight block 28, and the axial center of the shaft body 4 are in the same plane. At this time, the included angle formed by the radial center line of the keyway 6 and the radial center line of the positioning groove 9 is the included angle between the center line of the eccentric weight block 28 and the radial center line of the positioning groove 9. By detecting the angle difference between the detection keyway 6 and the positioning groove 9 on the transmission gear 8, the installation angle difference between the eccentric weight block 28 and the transmission gear 8 can be obtained.

[0035] The positioning groove 9 is used for preliminary positioning during detection to prevent the position deviation of the detection block 7 caused by the cooperation of other gear grooves on the transmission gear 8 with the positioning pin 10. When batch-assembling the transmission gear 8, each group of positioning grooves 9 should be assembled in the same position to ensure that the relative position between the keyway 6 and the positioning groove 9 remains unchanged. To facilitate quickly finding the positioning groove 9 during detection, in an embodiment of the present utility model, a marking hole 27 is also provided at the exact center position in the positioning groove 9, and no marking hole 27 is designed for other gear grooves. The balance shaft assembly in the present utility model further includes an eccentric weight block 28 and an annular limiting protrusion 29 provided on the shaft body 4. The eccentric weight block 28 and the annular limiting protrusion 29 are common structures on existing balance shafts and will not be elaborated here.

[0036] Before actual detection, a qualified balance shaft assembly is required to standardize the detection data. During measurement, first fix both ends of the balance shaft assembly on the first fixing seat 2 and the second fixing seat 3 respectively, and snap the positioning pin 10 into the positioning groove 9, and then snap the detection block 7 into the keyway 6. Subsequently, move the detection device to the position of one of the detection marking lines 11 of the detection block 7, and adjust the detection device to the initial state (i.e., the state without detection data). Finally, move the detection device so that its detection end slides from one of the detection marking lines 11 of the detection block 7 to the other detection marking line 11. At this time, record the height drop detected by the detection device, which is the standard detection data in the qualified state. After obtaining the standard detection data, the specified error range can be determined according to the analysis. In actual design, the distance between the two detection marking lines 11 on the detection block 7 is 20 - 40 mm, and the specific value can be selected according to actual needs. In a preferred embodiment of the present utility model, the distance between the two detection marking lines 11 is 20 mm.

[0037] During the above process, since the relative positions of the positioning groove 9 and the keyway 6 remain unchanged, the position of the detection block 7 also remains unchanged. During actual detection, if there is a deviation in the installation angle between the eccentric weight block 28 and the transmission gear 8, this will cause a deviation in the angle between the keyway 6 and the positioning groove 9, and further cause a deviation in the tilt angle of the detection block 7. Therefore, the height difference between the two detection marking lines 11 on the detection block 7 will also change. If it is detected that the height difference between the two detection marking lines 11 on the detection block is not within the range of the standard detection data, it indicates that the tilt angle of the detection block 7 has a deviation, that is, the angle between the keyway 6 and the positioning groove 9 has a deviation, and further it is concluded that the angle between the eccentric weight block 28 and the transmission gear 8 has a deviation, resulting in the unqualified product angle.

[0038] By using the device of the present utility model for detection, the measurement of the installation angle between the eccentric weight block 28 and the transmission gear 8 can be converted into a more convenient measurement of the height difference. It not only has simple operation, greatly improves work efficiency, but also has high measurement accuracy, good applicability and strong practicability.

[0039] As Figure 1 、 Figure 2 、 Figure 4 and Figure 5 shown, in the present utility model, the detection device includes a table base 12 and a support rod 13 vertically fixed on the table base 12; it also includes a cross arm 14. One end of the cross arm 14 is provided with a sliding through hole, and the other end is provided with a measuring gauge 15. The support rod 13 passes through the sliding through hole. A locking member 16 is also provided at the position of the sliding through hole of the cross arm 14; the measuring rod 17 of the detection gauge is vertically arranged, and the measuring head 18 of the measuring gauge 15 contacts the detection block 7. By pushing the table base to drive the measuring head 18 to slide between the two detection marking lines 11 on the detection block 7, the measurement of the height difference between the two detection marking lines 11 is realized, so as to realize the detection of the angular deviation between the keyway 6 and the positioning groove 9.

[0040] The table base 12 of the present utility model is a block structure with a certain thickness, and its main function is to stabilize the entire detection device and keep it balanced without tipping over. The cross arm 14 slides up and down along the support rod 13 and is locked and fixed by the locking member 16. The measuring gauge 15 is a common dial gauge or micrometer in the prior art, and the measuring head 18 of the measuring gauge 15 is a measuring head that moves up and down.

[0041] The above structure enables the cross arm 14 to be slidably connected to the support rod 13. During actual use, after aligning the measuring head 18 with one of the detection marking lines 11, the initial detection state of the measuring gauge 15 can be adjusted by adjusting the height of the cross arm 14. After the adjustment is completed, it is locked by the locking member 16. For easy operation, the locking member 16 is preferably a locking bolt with a handwheel.

[0042] As Figures 1 to 7As shown, in the present utility model, a cylinder 20 is fixedly connected to the first fixed seat 2 through a connecting sleeve 19; the output shaft of the cylinder 20 is horizontally arranged, and the end is fixedly connected to a first fixed cylinder 21, and the first fixed cylinder 21 abuts against one end of the shaft body 4 after passing through the first fixed seat 2; a first sleeve 23 is also sleeved outside the first fixed cylinder 21, and the first sleeve 23 is fixed on the first fixed seat 2, and the first fixed cylinder 21 can slide within the first sleeve 23;

[0043] A second fixed cylinder 22 is horizontally fixed on the second fixed seat 3, and the second fixed cylinder 22 abuts against the other end of the shaft body 4;

[0044] Both ends of the shaft body 4 are recessed inward to form abutting grooves 25, and the shapes of the ends of the first fixed cylinder 21 and the second fixed cylinder 22 that cooperate with the shaft body 4 match the shape of the abutting grooves 25.

[0045] During detection, first, the end of the shaft body 4 provided with the transmission gear 8 is abutted against the second fixed cylinder 22 on the second fixed seat 3. Specifically, the second fixed cylinder 22 is inserted into the abutting groove 25, then the positioning pin 10 is inserted into the positioning groove 9, and then the cylinder 20 is started to push the first fixed cylinder 21 into the abutting groove 25 and press it tightly, so as to fix the balance shaft assembly. After fixing the balance shaft assembly, the detection block 7 is inserted into the keyway 6 for subsequent detection.

[0046] As Figures 1 to 5 shown, in the present utility model, a guide rod 26 passing through the second fixed seat 3 is provided on the second fixed seat 3, the positioning pin 10 is fixed at the end of the guide rod 26, a second sleeve 24 is also sleeved outside the guide rod 26, and the second sleeve 24 is fixed on the second fixed seat 3, and the guide rod 26 can slide within the second sleeve 24.

[0047] In the present utility model, fixing the positioning pin 10 on the guide rod 26 is convenient for operation. By pulling the guide rod 26, its sliding within the second sleeve 24 can be realized, thereby controlling the mating state between the positioning pin 10 and the positioning groove 9. The second sleeve 24 is mainly provided in the present utility model to facilitate the sliding of the guide rod 26 within the second sleeve 24.

[0048] In the present utility model, both the first fixed seat 2 and the second fixed seat 3 are fixed on the bottom plate 1 through bolts, and both the connecting sleeve 19 and the cylinder 20 and the first fixed seat 2 are connected through bolts.

[0049] The above-described specific embodiments have further elaborated in detail the purpose, technical solutions and beneficial effects of the present utility model. It should be understood that the above is only the specific implementation method of the present utility model and is not used to limit the present utility model. Any modifications, equivalent replacements and improvements made within the gist of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A balance shaft tooth angle gauge, characterized in that: The invention comprises a base plate (1), a first fixing seat (2), a second fixing seat (3) and a detection device, wherein the first fixing seat (2) and the second fixing seat (3) are both fixed on the base plate (1), and a balancing shaft assembly is arranged between the first fixing seat (2) and the second fixing seat (3); The balancing shaft assembly comprises a shaft body (4) and a detection annular protrusion (5) arranged on the shaft body (4); a key groove (6) is provided on the edge of the detection annular protrusion (5); and a detection block (7) is clamped on the key groove (6); The balancing shaft assembly also includes a transmission gear (8) arranged at one end of the shaft body (4), one of the tooth grooves on the transmission gear (8) is used as a positioning groove (9), and a positioning pin (10) matching the positioning groove (9) is provided on the second fixing seat (3); The angle between the key slot (6) and the positioning slot (9) remains fixed, and two detection marking lines (11) parallel to the shaft body (4) are arranged on the detection block (7). The detection device detects the angle deviation between the key slot (6) and the positioning slot (9) by measuring the height difference between the two detection marking lines (11).

2. The balance shaft tooth angle gauge according to claim 1, characterized in that: The detection device comprises a meter base (12) and a support rod (13) vertically fixed on the meter base (12); and also comprises a cross arm (14), one end of the cross arm (14) is provided with a sliding through hole, and the other end is provided with a measuring meter (15), the support rod (13) passes through the sliding through hole, and a locking member (16) is also provided at the position of the sliding through hole of the cross arm (14); the measuring rod (17) of the measuring meter is vertically arranged, and the measuring head (18) of the measuring meter (15) contacts the detection block (7), and by pushing the meter base (12), the measuring head (18) is driven to slide between two detection mark lines (11) on the detection block (7), so as to measure the height difference of the two detection mark lines (11), thereby realizing the detection of the angle deviation between the key slot (6) and the positioning slot (9).

3. The balance shaft tooth angle gauge according to claim 1 or 2, characterized in that: A cylinder (20) is fixedly connected to the first fixed seat (2) via a connecting sleeve (19); the output shaft of the cylinder (20) is arranged horizontally, and a first fixed column (21) is fixedly connected to the end thereof, and the first fixed column (21) penetrates the first fixed seat (2) and abuts against one end of the shaft body (4); a first sleeve (23) is also sleeved on the outside of the first fixed seat (21), and the first sleeve (23) is fixed on the first fixed seat (2), and the first fixed column (21) can slide in the first sleeve (23); A second fixing column (22) is horizontally fixed on the second fixing seat (3), and the second fixing column (22) is in contact with the other end of the shaft (4); The ends of both ends of the shaft body (4) are recessed inwards to form abutment grooves (25), and the ends of the first fixed column (21) and the second fixed column (22) match the shapes of the abutment grooves (25).

4. The balance shaft tooth angle gauge according to claim 1 or 2, characterized in that: The second fixing seat (3) is provided with a guide rod (26) penetrating the second fixing seat (3), the positioning pin (10) is fixed to the end of the guide rod (26), the guide rod (26) is also sleeved with a second sleeve (24) outside, and the second sleeve (24) is fixed on the second fixing seat (3), and the guide rod (26) can slide in the second sleeve (24).

5. The balance shaft tooth angle gauge according to claim 3, characterized in that: The second fixing seat (3) is provided with a guide rod (26) penetrating the second fixing seat (3), the positioning pin (10) is fixed to the end of the guide rod (26), the guide rod (26) is also sleeved with a second sleeve (24) outside, and the second sleeve (24) is fixed on the second fixing seat (3), and the guide rod (26) can slide in the second sleeve (24).

6. The balance shaft tooth angle gauge according to claim 1, 2 or 5, characterized in that: A marking hole (27) is also provided in the positioning groove (9).

7. The balance shaft tooth angle gauge according to claim 1, 2 or 5, characterized in that: The distance between the two detection marking lines (11) on the detection block (7) is 20-40 mm.

8. The balance shaft tooth angle gauge according to claim 1, 2 or 5, characterized in that: The balancing shaft assembly also includes an eccentric weight (28) and an annular limiting protrusion (29) arranged on the shaft body (4).

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