Assembly measurement method for double-groove tandem bearings

Abstract

The present invention provides a method for measuring the assembly of a dual-channel tandem bearing. The method comprises the following steps: first, fitting the upper inner ring, rolling elements, and outer ring together; second, lowering the outer ring onto the housing, with the upper inner ring resting on the upper housing, applying an axial preload, and measuring the height difference h1 between the upper inner ring and the outer ring's upper end faces; third, fitting the lower inner ring, rolling elements, and outer ring together, with the upper inner ring resting on the lower inner ring; fourth, similarly measuring the height difference h2 between the upper inner ring and the outer ring's upper end faces; and fifth, if h1 < h2, the bearing grinding amount b is calculated as |h1 - h2|. The present invention considers the deformation of the upper inner ring when measuring the lower inner ring after fitting, resulting in more accurate measurement results and better bearing assembly. The bearing grinding amount is determined by the difference between the two protrusion measurements, simplifying the assembly method. The magnitudes of h1 and h2 allow for direct determination of whether the bearing requires grinding or fails to meet assembly requirements, making this determination convenient and improving assembly efficiency.

Description

[0001] This application is a divisional application of the following application. The application date of the original application is August 13, 2021, the application number of the original application is 2021109310997, and the invention name of the original application is: Assembly measurement method of double-channel tandem bearings and measuring device for implementing this method. Technical Field

[0002] The present invention relates to the technical field of assembly measurement of double-channel tandem bearings, and in particular to an assembly measurement method of double-channel tandem bearings. Background Art

[0003] Angular contact ball bearings are usually used in groups. One of the purposes of tandem bearing combinations is to make the bearings involved in the combination share the external axial force. The optimal combination result is to make the bearings involved in the tandem combination share the external axial force evenly. In this way, the external force on each bearing is basically the same, avoiding the early failure of individual bearings due to excessive (uneven) force, which will lead to the failure of the entire bearing group.

[0004] At present, the pairing method of bearings is usually to measure a single bearing and then assemble it. For example, for a double-groove bearing with an integral inner ring and a separate outer ring, the Chinese invention patent application with application publication number CN105041854A discloses a tandem-assembled double-row angular contact ball bearing and its assembly method. By separately fitting the upper and lower outer rings with the inner ring, measuring the distance L1 between the narrow side end face of the upper outer ring and the lower end face of the inner ring, and measuring the distance L2 between the wide side end face of the lower outer ring and the lower end face of the inner ring, the thickness B to be ground is calculated, and the narrow side end face of the upper outer ring is ground according to the thickness to ensure that the axial clearance of the assembled tandem-assembled angular contact ball bearing meets the design requirements.

[0005] Another example is a double-groove bearing with an integrated outer ring and a separate inner ring. The Chinese invention patent application with application publication number CN106438710A discloses a method for assembling a double-groove outer ring series-assembled angular contact ball bearing. The method involves separately fitting the upper inner ring and the lower inner ring with the outer ring, measuring the distance L1 between the narrow side end face of the upper inner ring and the lower end face of the outer ring, and measuring the distance L2 between the wide side end face of the lower inner ring and the lower end face of the outer ring. The thickness b to be ground is calculated, and the narrow side end face of the upper inner ring is ground according to the thickness.

[0006] During the measurement process, the two assembly methods mentioned above both separately fit the upper outer ring and the lower outer ring with the inner ring, or separately fit the upper inner ring and the lower inner ring with the outer ring. When measuring the assembled lower outer ring, the stress and deformation of the upper outer ring are not considered. When measuring the assembled lower inner ring, the stress and deformation of the upper inner ring are not considered. Therefore, the measurement results of the two methods mentioned above are not accurate enough, and the bearing assembly effect is poor. Summary of the Invention

[0007] The object of the present invention is to provide a method for assembling and measuring a dual-channel tandem bearing, so as to solve the problem that the existing assembly method does not take into account the stress and deformation of the upper outer ring or the upper inner ring when measuring the lower outer ring or the lower inner ring, resulting in inaccurate measurement results and poor bearing assembly effect; the object of the present invention is to provide another method for assembling and measuring a dual-channel tandem bearing, so as to solve the problem that the existing assembly method does not take into account the stress and deformation of the upper outer ring or the upper inner ring when measuring the lower outer ring or the lower inner ring, resulting in inaccurate measurement results and poor bearing assembly effect; the object of the present invention is also to provide a measuring device for implementing the above two methods for assembling and measuring dual-channel tandem bearings.

[0008] To achieve the above objectives, the present invention provides a method for measuring the assembly of a dual-groove tandem bearing using the following technical solutions:

[0009] The assembly measurement method of a double-groove tandem bearing includes the following steps:

[0010] The first step is to fit the upper outer ring, the upper rolling element and the integrated inner ring together, or fit the upper inner ring, the upper rolling element and the integrated outer ring together;

[0011] The second step is to place an inner ring or an outer ring on the lower seat so that the upper end surface of the upper outer ring or the upper inner ring presses against the upper seat. Fix one of the upper and lower seats and apply axial preload to the other to move the inner ring upward relative to the upper outer ring or the outer ring upward relative to the upper inner ring. Measure the height difference H1 between the upper outer ring and the upper end surface of the inner ring or the height difference h1 between the outer ring and the upper end surface of the upper inner ring. If the upper outer ring is higher than the inner ring or if the outer ring is higher than the upper inner ring, H1 or h1 is a positive value; otherwise, it is a negative value.

[0012] The third step is to fit the lower outer ring, the lower rolling element and the integrated inner ring together, and place the upper outer ring on the lower outer ring, or fit the lower inner ring, the lower rolling element and the integrated outer ring together, and place the upper inner ring on the lower inner ring.

[0013] Step 4: Place the inner ring or the outer ring on the lower seat so that the upper end surface of the upper outer ring or the upper inner ring presses against the upper seat. Fix one of the upper and lower seats and apply axial preload to the other to move the inner ring upward relative to the upper outer ring or the outer ring upward relative to the upper inner ring. Measure the height difference H2 between the upper end surface of the outer ring and the inner ring, or measure the height difference h2 between the outer ring and the upper end surface of the upper inner ring. If the upper outer ring is higher than the inner ring or if the outer ring is higher than the upper inner ring, H2 or h2 is a positive value; otherwise, it is a negative value.

[0014] The fifth step is to determine the size of H1 and H2 or the size of h1 and h2. If H1 < H2 or h1 > h2, the grinding amount B of the bearing is |H1-H2| or the grinding amount b of the bearing is |h1-h2|. Grind the fitting surfaces of the upper outer ring and the lower outer ring according to the grinding amount B or grind the fitting surfaces of the upper inner ring and the lower inner ring according to the grinding amount b until H1 = H2 or h1 = h2. If H1 > H2 or h1 < h2, the bearing set does not meet the assembly requirements and the bearing rings should be replaced.

[0015] The beneficial effect of the above technical solution is that, when measuring the upper outer ring or the upper inner ring separately, this method measures the height difference H1 between the upper outer ring and the upper end surface of the inner ring, or the height difference h1 between the outer ring and the upper end surface of the upper inner ring, that is, the bearing protrusion. This measurement method is very mature in the existing technology and is easier and more convenient to operate than the two referenced documents in the background art. Similarly, the same effect is achieved when measuring H2 or h2.

[0016] Moreover, when measuring the lower outer ring or the lower inner ring after assembling the lower outer ring, the method places the upper outer ring on the lower outer ring or places the upper inner ring on the lower inner ring, and presses the upper end surface of the upper outer ring or the upper inner ring against the upper seat. In this way, in the subsequent process of applying the axial preload, the deformation of the upper outer ring or the upper inner ring is fully considered, which is closer to the actual working conditions. Therefore, the measurement result is more accurate, and the bearing assembly effect guided by this will be better.

[0017] This method directly determines the bearing grinding amount based on the difference between the two protrusion measurements, ensuring accurate grinding values ​​while simplifying the assembly process. Furthermore, the relationship between H1 and H2, or h1 and h2, can be used to directly determine whether the bearing requires a certain amount of grinding to meet assembly requirements, or whether it cannot meet assembly requirements at all and requires replacement of the bearing rings. This facilitates determination and improves bearing assembly efficiency.

[0018] Furthermore, in order to facilitate measurement, a micrometer is used to measure H1 and H2 or h1 and h2, so that the measuring end of the micrometer contacts the upper end face of an inner ring or an outer ring, wherein when the upper end face of the upper outer ring is pressed against the upper seat body, an avoidance hole is provided on the upper seat body for the measuring end of the micrometer to pass through.

[0019] Furthermore, in order to avoid grinding the wide end surface serving as the base surface, when grinding the contact surfaces of the upper outer ring and the lower outer ring, it is sufficient to grind the narrow end surface of the upper outer ring or the lower outer ring.

[0020] Furthermore, in order to avoid grinding the wide end surface serving as the base surface, when grinding the contact surfaces of the upper inner ring and the lower inner ring, it is sufficient to grind the narrow end surface of the upper inner ring or the lower inner ring.

[0021] To achieve the above-mentioned purpose, another method for measuring the assembly of a dual-groove tandem bearing of the present invention adopts the following technical solution:

[0022] The assembly measurement method of a double-groove tandem bearing includes the following steps:

[0023] The first step is to fit the lower outer ring, the lower rolling element and the integrated inner ring together, and place the upper outer ring on the lower outer ring, or fit the lower inner ring, the lower rolling element and the integrated outer ring together, and place the upper inner ring on the lower inner ring.

[0024] The second step is to place an inner ring or an outer ring on the lower seat so that the upper end surface of the upper outer ring or the upper inner ring presses against the upper seat. Fix one of the upper and lower seats and apply axial preload to the other to move the inner ring upward relative to the upper outer ring or the outer ring upward relative to the upper inner ring. Measure the height difference H2 between the upper end surface of the outer ring and the inner ring, or measure the height difference h2 between the outer ring and the upper end surface of the upper inner ring. If the upper outer ring is higher than the inner ring or if the outer ring is higher than the upper inner ring, H2 or h2 is a positive value; otherwise, it is a negative value.

[0025] The third step is to fit the upper outer ring, the upper rolling element and the integrated inner ring together, or to fit the upper inner ring, the upper rolling element and the integrated outer ring together;

[0026] Step 4: Place the inner ring or the outer ring on the lower seat so that the upper end surface of the upper outer ring or the upper inner ring presses against the upper seat. Fix one of the upper and lower seats and apply axial preload to the other to move the inner ring upward relative to the upper outer ring or the outer ring upward relative to the upper inner ring. Measure the height difference H1 between the upper outer ring and the upper end surface of the inner ring or the height difference h1 between the outer ring and the upper end surface of the upper inner ring. If the upper outer ring is higher than the inner ring or if the outer ring is higher than the upper inner ring, H1 or h1 is a positive value; otherwise, it is a negative value.

[0027] The fifth step is to determine the size of H1 and H2 or the size of h1 and h2. If H1 < H2 or h1 > h2, the grinding amount B of the bearing is |H1-H2| or the grinding amount b of the bearing is |h1-h2|. Grind the fitting surfaces of the upper outer ring and the lower outer ring according to the grinding amount B or grind the fitting surfaces of the upper inner ring and the lower inner ring according to the grinding amount b until H1 = H2 or h1 = h2. If H1 > H2 or h1 < h2, the bearing set does not meet the assembly requirements and the bearing rings should be replaced.

[0028] The beneficial effect of the above technical solution lies in the fact that this method differs from the above method in that the steps are swapped. This method first measures H2 or h2, then measures H1 or h1, achieving the same effect as above. When measuring the upper outer ring or upper inner ring separately, the height difference H1 between the upper outer ring and the upper end surface of the integral inner ring, or the height difference h1 between the integral outer ring and the upper end surface of the upper inner ring, is measured, which is the bearing protrusion. This measurement method is very mature in the prior art and is easier and more convenient to operate than the two referenced documents in the background art. Similarly, the same effect is achieved when measuring H2 or h2.

[0029] In addition, when measuring the lower outer ring or the lower inner ring, the upper outer ring is placed on the lower outer ring or the upper inner ring is placed on the lower inner ring, and the upper end surface of the upper outer ring or the upper inner ring is pressed against the upper seat. In this way, in the subsequent process of applying axial preload, the deformation of the upper outer ring or the upper inner ring is fully considered, which is closer to the actual working conditions. Therefore, the measurement result is more accurate, and the bearing assembly effect guided by this will be better.

[0030] This method directly determines the bearing grinding amount based on the difference between the two protrusion measurements, ensuring accurate grinding values ​​while simplifying the assembly process. Furthermore, the relationship between H1 and H2, or h1 and h2, can be used to directly determine whether the bearing requires a certain amount of grinding to meet assembly requirements, or whether it cannot meet assembly requirements at all and requires replacement of the bearing rings. This facilitates determination and improves bearing assembly efficiency.

[0031] Furthermore, in order to facilitate measurement, a micrometer is used to measure H1 and H2 or h1 and h2, so that the measuring end of the micrometer contacts the upper end face of an inner ring or an outer ring, wherein when the upper end face of the upper outer ring is pressed against the upper seat body, an avoidance hole is provided on the upper seat body for the measuring end of the micrometer to pass through.

[0032] Furthermore, in order to avoid grinding the wide end surface serving as the base surface, when grinding the contact surfaces of the upper outer ring and the lower outer ring, it is sufficient to grind the narrow end surface of the upper outer ring or the lower outer ring.

[0033] Furthermore, in order to avoid grinding the wide end surface serving as the base surface, when grinding the contact surfaces of the upper inner ring and the lower inner ring, it is sufficient to grind the narrow end surface of the upper inner ring or the lower inner ring.

[0034] To achieve the above objectives, the measuring device for implementing the above two methods for measuring the assembly of dual-groove tandem bearings adopts the following technical solutions:

[0035] The measuring device includes:

[0036] A frame, the frame comprising a top wall, a bottom wall, and side walls connected between the top wall and the bottom wall;

[0037] The upper seat is located between the top wall and the bottom wall and is used to press the upper end surface of the upper outer ring or the upper inner ring;

[0038] Lower seat; located between the top wall and the bottom wall, used to press an inner ring or an outer ring;

[0039] In which, the upper seat body is fixed on the lower side surface of the top wall, and the measuring device also includes a force shaft passing through the bottom wall and fixedly connected to the lower seat body, or the lower seat body is fixed on the upper side surface of the bottom wall, and the measuring device also includes a force shaft passing through the top wall and fixedly connected to the upper seat body.

[0040] The beneficial effects of the above technical solution are: the upper seat body is convenient for pressing the upper end surface of the upper outer ring or the upper inner ring, the lower seat body is convenient for pressing the inner ring or the outer ring, and one of the upper seat body and the lower seat body is fixed, and the measuring device also includes a force shaft fixedly connected to the other, so that the axial preload force can be easily applied, thereby facilitating the measurement of H1 and H2 or h1 and h2, completing the above-mentioned assembly measurement method.

[0041] Furthermore, in order to facilitate measurement, the measuring device also includes a micrometer, and a through hole is provided on the top wall for the measuring end of the micrometer to pass through. When the upper seat is used to press the upper outer ring, an avoidance hole is provided on the upper seat for the measuring end of the micrometer to pass through. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1This is a structural diagram of an inner ring double-groove tandem bearing targeted by Example 1 of the double-groove tandem bearing assembly measurement method of the present invention;

[0043] Figure 2 This is a partial schematic diagram of Example 1 of the assembly measurement method for a dual-channel tandem bearing in the present invention;

[0044] Figure 3 Another partial schematic diagram of Example 1 of the assembly measurement method for a dual-groove tandem bearing of the present invention;

[0045] Figure 4 This is a structural diagram of an outer ring double-groove tandem bearing targeted by Example 3 of the assembly measurement method for a double-groove tandem bearing in the present invention;

[0046] Figure 5 This is a partial schematic diagram of Example 3 of the assembly measurement method of a dual-channel tandem bearing in the present invention;

[0047] Figure 6 This is another partial schematic diagram of Example 3 of the assembly measurement method for a double-channel tandem bearing in the present invention.

[0048] In the figure: 1. Frame; 1-1. Through hole; 2. Force shaft; 3. Lower seat; 4. Upper seat; 4-1. Avoidance hole; 5. Micrometer; 6. Inner ring; 7. Upper outer ring; 8. Upper rolling element; 9. Lower outer ring; 10. Lower rolling element; 11. Lower seat; 12. Upper seat; 13. Outer ring; 14. Upper inner ring; 15. Upper rolling element; 16. Lower inner ring; 17. Lower rolling element. DETAILED DESCRIPTION

[0049] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0051] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0052] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0053] The embodiment 1 of the assembly measurement method of the double-channel tandem bearing in the present invention (hereinafter referred to as the assembly measurement method) is as follows: The double-channel tandem bearing targeted by the assembly measurement method in this embodiment is an inner ring double-channel tandem bearing, such as Figure 1 As shown, the inner ring dual-channel tandem bearing includes an inner ring 6, with upper and lower outer channels disposed on its outer circumference. It also includes an upper outer ring 7 that mates with the upper outer channel of the inner ring 6. Upper outer ring 7 is provided with an inner channel, with upper rolling elements 8 positioned between the inner channel and the upper outer channel.

[0054] The inner ring double groove tandem bearing also includes a lower outer ring 9 that cooperates with the lower outer groove of the inner ring 6. The lower outer ring 9 is provided with an inner groove, and the lower rolling element 10 is filled between the inner groove of the lower outer ring 9 and the lower outer groove. The upper end faces of the upper outer ring 7 and the lower outer ring 9 are both wide end faces, and the lower end faces are both narrow end faces. Figure 1 As shown, w1, w2, w3, and w4 are the contact points between the outer ring of the bearing and the rolling element on the cross section, and n1, n2, n3, and n4 are the contact points between the inner ring of the bearing and the rolling element on the cross section.

[0055] The following methods are required to implement the combined measurement method in this embodiment: Figure 2 and Figure 3The measuring device shown in FIG. , which is an embodiment of the measuring device of the present invention, comprises a frame 1, a force-applying shaft 2, a lower base 3, an upper base 4, and a micrometer 5. The frame 1 comprises a top wall, a bottom wall, and side walls connected therebetween. The upper base 4 is located between the top and bottom walls and fixed to the underside of the top wall, for pressing against the upper end face of the upper outer ring 7. The lower base 3 is located between the top and bottom walls and for pressing against the integral inner ring 6. The force-applying shaft 2 passes through the bottom wall and is fixedly connected to the lower base 3, for applying an axial preload to the lower base 3. The micrometer 5 has a gauge head located at the top of the frame 1, with its measuring end contacting the upper end face of the integral inner ring 6. The top wall is provided with a through-hole 1-1 for the measuring end of the micrometer 5 to pass through, while the upper base 4 is provided with a relief hole 4-1 for the measuring end of the micrometer 5 to pass through.

[0056] The combined measurement method in this embodiment includes the following steps:

[0057] The first step is to assemble the upper outer ring 7, the upper rolling element 8 and the integrated inner ring 6 together;

[0058] The second step is Figure 2 As shown, place the inner ring 6 on the lower seat 3 so that the upper end surface of the upper outer ring 7 presses against the upper seat 4. Use the force-applying shaft 2 to apply an axial preload to the lower seat 3, causing the inner ring 6 to move upward relative to the upper outer ring 7. Use the dial gauge 5 to measure the height difference H1 between the upper end surfaces of the upper outer ring 7 and the inner ring 6. If the upper outer ring 7 is higher than the inner ring 6, H1 is a positive value; otherwise, it is a negative value.

[0059] The third step is to assemble the lower outer ring 9, the lower rolling element 10 and the integrated inner ring 6 together, and place the upper outer ring 7 on the lower outer ring 9;

[0060] The fourth step is as follows Figure 3 As shown, place the inner ring 6 on the lower seat 3 so that the upper end surface of the upper outer ring 7 presses against the upper seat 4. Use the force-applying shaft 2 to apply an axial preload to the lower seat 3, causing the inner ring 6 to move upward relative to the upper outer ring 7. Use the dial gauge 5 to measure the height difference H2 between the upper end surface of the upper outer ring 7 and the inner ring 6. If the upper outer ring 7 is higher than the inner ring 6, H2 is a positive value; otherwise, it is a negative value.

[0061] The fifth step is to determine the size of H1 and H2. If H1 is less than H2, the grinding amount B of the bearing is |H1-H2|. Grind the fitting surfaces of the upper and lower outer rings according to the grinding amount B until H1=H2. If H1 is greater than H2, the bearing set does not meet the assembly requirements and the bearing rings should be replaced.

[0062] Among them, when using the micrometer 5 to measure H1 and H2, first place a standard washer between the lower seat 3 and the upper seat 4, so that the measuring end of the micrometer 5 contacts the upper end face of the washer, then adjust the micrometer 5 to zero, remove the washer, and assemble the bearing. Finally, when the axial preload force is applied, the measuring end of the micrometer 5 contacts the upper end face of the inner ring 6. At this time, the reading of the micrometer 5 is H1 or H2. The measurement principle is the same as that in the invention patent application CN103925898A.

[0063] In addition, when grinding the fitting surfaces of the upper outer ring 7 and the lower outer ring 9, it is sufficient to grind the narrow end surface of the upper outer ring 7 (i.e., the lower end surface of the upper outer ring 7) to avoid grinding the wide end surface serving as the base surface.

[0064] The combined measurement method in this embodiment, when measuring the upper outer ring 7 alone, measures the height difference H1 between the upper outer ring 7 and the upper end surface of the integral inner ring 6, thereby measuring the bearing's protrusion. This measurement method is highly mature in the prior art and, compared to the two referenced documents in the background art, makes measuring protrusion easier and more convenient. Similarly, the same effect is achieved when measuring H2.

[0065] In addition, when measuring the lower outer ring 9 after fitting it, this assembly measurement method places the upper outer ring 7 on the lower outer ring 9, and presses the upper end surface of the upper outer ring 7 against the upper seat 4. In this way, during the subsequent application of the axial preload, the deformation of the upper outer ring 7 is fully taken into account, which is closer to the actual working conditions. Therefore, the measurement results are more accurate, and the bearing assembly effect guided by this method will be better.

[0066] This assembly measurement method directly determines the required grinding amount for the bearing based on the difference between the two protrusion measurements. This not only ensures accurate grinding values ​​but also simplifies the assembly process. Furthermore, the relationship between H1 and H2 allows for direct judgment on whether the bearing requires a certain amount of grinding to meet assembly requirements, or whether it cannot meet assembly requirements at all and requires replacement of the bearing rings. This facilitates this determination and improves bearing assembly efficiency.

[0067] Embodiment 2 of the combination measurement method of the present invention is:

[0068] The difference from Example 1 is that Example 2 swaps the third and fourth steps with the first and second steps in Example 1, that is, in Example 2, H2 is measured first and then H1. The rest is the same, and the technical effects produced are also the same, which will not be repeated here.

[0069] Embodiment 3 of the combination measurement method of the present invention is:

[0070] The double-groove tandem bearing targeted by the assembly measurement method in this embodiment is an outer ring double-groove tandem bearing, such as Figure 4 As shown, the outer ring dual-channel tandem bearing includes an outer ring 13, with upper and lower inner channels disposed on its inner circumference. The outer ring dual-channel tandem bearing also includes an upper inner ring 14 that mates with the upper inner channel of the outer ring 13. Upper inner ring 14 is provided with an outer channel, with upper rolling elements 15 positioned between the outer channel and the upper inner channel.

[0071] The outer ring double groove tandem bearing also includes a lower inner ring 16 that cooperates with the lower inner groove of the outer ring 13. The lower inner ring 16 is provided with an outer groove, and the lower rolling element 17 is filled between the outer groove of the lower inner ring 16 and the lower inner groove. The upper end faces of the upper inner ring 14 and the lower inner ring 16 are both wide end faces, and the lower end faces are both narrow end faces. Figure 4 As shown, w5, w6, w7, and w8 are the contact points between the outer ring of the bearing and the rolling element on the cross section, and n5, n6, n7, and n8 are the contact points between the inner ring of the bearing and the rolling element on the cross section.

[0072] The following methods are required to implement the combined measurement method in this embodiment: Figure 5 and Figure 6 The measuring device shown in FIG, which is another embodiment of the measuring device of the present invention, includes a frame 1, a force-applying shaft 2, a lower seat 11, an upper seat 12, and a micrometer 5. The frame 1 includes a top wall, a bottom wall, and a side wall connected between the top and bottom walls. The upper seat 12 is located between the top and bottom walls and fixed to the lower side of the top wall, and is used to press the upper end face of the upper inner ring 14. The lower seat 11 is located between the top and bottom walls and is used to press the outer ring 13. The force-applying shaft 2 passes through the bottom wall and is fixedly connected to the lower seat 11, and is used to apply an axial preload force to the lower seat 11. The dial gauge 5 has a gauge head located at the top of the frame 1, and its measuring end is used to contact the upper end face of the outer ring 13. The top wall is provided with a through hole 1-1 for the measuring end of the micrometer 5 to pass through.

[0073] In fact, the measuring device in this embodiment is basically the same as the previous embodiment, wherein the frame 1, the force shaft 2, and the micrometer 5 are the same as the previous embodiment, and the upper seat and the lower seat in this embodiment are equivalent to the upper seat and the lower seat in the previous embodiment with their positions swapped.

[0074] The combined measurement method in this embodiment includes the following steps:

[0075] The first step is to assemble the upper inner ring 14, the upper rolling element 15 and the outer ring 13 together;

[0076] The second step is Figure 5As shown, place the outer ring 13 on the lower seat 11 so that the upper end surface of the upper inner ring 14 presses against the upper seat 12. Use the force-applying shaft 2 to apply an axial preload to the lower seat 11, causing the outer ring 13 to move upward relative to the upper inner ring 14. Measure the height difference h1 between the upper end surfaces of the outer ring 13 and the upper inner ring 14. If the outer ring 13 is higher than the upper inner ring 14, h1 is a positive value; otherwise, it is a negative value.

[0077] The third step is to assemble the lower inner ring 16, the lower rolling element 17 and the outer ring 13 together, and place the upper inner ring 14 on the lower inner ring 16;

[0078] The fourth step is as follows Figure 6 As shown, place the outer ring 13 on the lower seat 11 so that the upper end surface of the upper inner ring 14 presses against the upper seat 12. Use the force-applying shaft 2 to apply an axial preload to the lower seat 11, causing the outer ring 13 to move upward relative to the upper inner ring 14. Measure the height difference h2 between the upper end surfaces of the outer ring 13 and the upper inner ring 14. If the outer ring 13 is higher than the upper inner ring 14, h2 is a positive value; otherwise, it is a negative value.

[0079] The fifth step is to determine the size of h1 and h2. If h1>h2, the grinding amount b of the bearing is |h1-h2|. Grind the fitting surfaces of the upper inner ring 14 and the lower inner ring 16 according to the grinding amount b until h1=h2. If h1<h2, the bearing set does not meet the assembly requirements and the bearing rings should be replaced.

[0080] Among them, when using the micrometer 5 to measure h1 and h2, first place a standard washer between the lower seat 11 and the upper seat 12, so that the measuring end of the micrometer 5 contacts the upper end face of the washer, then adjust the micrometer 5 to zero, remove the washer, and assemble the bearing. Finally, when the axial preload force is applied, the measuring end of the micrometer 5 contacts the upper end face of the outer ring 13. At this time, the reading of the micrometer 5 is h1 or h2. The measurement principle is the same as that in the invention patent application CN103925898A.

[0081] In addition, when grinding the fitting surfaces of the upper inner ring 14 and the lower inner ring 16, it is sufficient to grind the narrow end face of the upper inner ring 14 (i.e., the lower end face of the upper inner ring 14) to avoid grinding the wide end face serving as the base surface.

[0082] The combined measurement method in this embodiment, when measuring the upper inner ring 14 alone, measures the height difference h1 between the outer ring 13 and the upper end surface of the upper inner ring 14, thereby measuring the bearing's protrusion. This measurement method is highly mature in the prior art and, compared to the two referenced documents in the background art, makes measuring protrusion easier and more convenient. Similarly, the same effect is achieved when measuring h2.

[0083] In addition, when measuring the lower inner ring 16 after fitting it, this assembly measurement method places the upper inner ring 14 on the lower inner ring 16, and presses the upper end surface of the upper inner ring 14 against the upper seat 12. In this way, in the subsequent process of applying the axial preload, the deformation of the upper inner ring 14 is fully considered, which is closer to the actual working conditions. Therefore, the measurement results are more accurate, and the bearing assembly effect guided by this will be better.

[0084] This assembly measurement method directly determines the required grinding amount for a bearing based on the difference between the two protrusion measurements. This not only ensures accurate grinding values ​​but also simplifies the assembly process. Furthermore, the relationship between h1 and h2 allows for direct judgment on whether a bearing requires a certain amount of grinding to meet assembly requirements, or whether it cannot meet assembly requirements at all and requires replacement of the bearing rings. This facilitates this determination and improves bearing assembly efficiency.

[0085] Embodiment 4 of the combination measurement method of the present invention is:

[0086] The difference from Example 3 is that Example 4 swaps the third and fourth steps with the first and second steps in Example 3, that is, in Example 4, h2 is measured first and then h1. The rest is the same, and the technical effects produced are also the same, which will not be repeated here.

[0087] In other embodiments of the measuring device: the measuring device does not include a dial indicator, but uses other tools and means to measure H1, H2, h1 and h2, for example, multiple rulers can be used for measurement, or other measurement methods known in the prior art.

[0088] In other embodiments of the measuring device, the lower seat body can be fixed on the upper side of the bottom wall, and the force-applying shaft passes through the top wall and is fixedly connected to the upper seat body.

[0089] In other embodiments of the assembly measurement method of the double-groove tandem bearing: when grinding the contact surfaces of the upper inner ring and the lower inner ring, the wide side end face of the lower inner ring (i.e. Figure 4 or when the narrow side faces of the upper and lower inner rings are facing upwards, grind the narrow side face of the lower inner ring.

[0090] In other embodiments of the assembly measurement method of the double-groove tandem bearing: when grinding the fitting surfaces of the upper outer ring and the lower outer ring, the wide side end face of the lower outer ring (i.e. Figure 1 or when the narrow side faces of the upper and lower outer rings are facing upwards, grind the narrow side face of the lower outer ring.

[0091] In other embodiments of the assembly measurement method of the double-channel tandem bearing: H1, H2, h1 and h2 can also be measured with the aid of other tools, such as the combination of multiple rulers, or other measurement methods known in the prior art.

[0092] In other embodiments of the assembly measurement method of the double-channel tandem bearing, the lower seat body can be fixed and an axial preload force can be applied to the upper seat body to achieve the same effect.

[0093] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall be included in the scope of protection of the present invention.

Claims

1. The assembly measurement method of double-channel tandem bearings is characterized by: The following steps are involved: The first step is to assemble the upper inner ring, upper rolling element and integrated outer ring together; The second step is to place the outer ring on the lower seat so that the upper end face of the upper inner ring presses against the upper seat. Fix one of the upper and lower seats and apply axial preload to the other, so that the outer ring moves upward relative to the upper inner ring. Measure the height difference h1 between the outer ring and the upper end face of the upper inner ring. If the outer ring is higher than the upper inner ring, h1 is positive; otherwise, it is negative. The third step is to assemble the lower inner ring, the lower rolling element and the integrated outer ring together, and place the upper inner ring on the lower inner ring; Step 4: Place the outer ring on the lower seat so that the upper end face of the upper inner ring presses against the upper seat. Fix one of the upper and lower seats and apply axial preload to the other, causing the outer ring to move upward relative to the upper inner ring. Measure the height difference h2 between the outer ring and the upper end face of the upper inner ring. If the outer ring is higher than the upper inner ring, h2 is positive; otherwise, it is negative. The fifth step is to determine the size of h1 and h2. If h1>h2, the grinding amount b of the bearing is |h1-h2|. Grind the fitting surfaces of the upper inner ring and the lower inner ring according to the grinding amount b until h1=h2. If h1<h2, the bearing set does not meet the assembly requirements and the bearing rings should be replaced.

2. The assembly and measurement method of a double-channel tandem bearing according to claim 1, characterized in that: Use a dial indicator to measure h1 and h2, making sure the measuring end of the dial indicator contacts the upper end face of the outer ring.

3. The assembly and measurement method of a dual-channel tandem bearing according to claim 1 or 2, characterized in that: When grinding the fitting surfaces of the upper inner ring and the lower inner ring, it is sufficient to grind the narrow side end surface of the upper inner ring or the lower inner ring.

4. The assembly measurement method of double-channel tandem bearings is characterized by: The following steps are involved: The first step is to assemble the lower inner ring, the lower rolling element and the integrated outer ring together, and place the upper inner ring on the lower inner ring; The second step is to place the outer ring on the lower seat so that the upper end face of the upper inner ring presses against the upper seat. Fix one of the upper and lower seats and apply axial preload to the other, so that the outer ring moves upward relative to the upper inner ring. Measure the height difference h2 between the outer ring and the upper end face of the upper inner ring. If the outer ring is higher than the upper inner ring, h2 is positive; otherwise, it is negative. The third step is to assemble the upper inner ring, the upper rolling element and the integrated outer ring together; Step 4: Place the outer ring on the lower seat so that the upper end face of the upper inner ring presses against the upper seat. Fix one of the upper and lower seats and apply axial preload to the other, causing the outer ring to move upward relative to the upper inner ring. Measure the height difference h1 between the outer ring and the upper end face of the upper inner ring. If the outer ring is higher than the upper inner ring, h1 is positive; otherwise, it is negative. The fifth step is to determine the size of h1 and h2. If h1>h2, the grinding amount b of the bearing is |h1-h2|. Grind the fitting surfaces of the upper inner ring and the lower inner ring according to the grinding amount b until h1=h2. If h1<h2, the bearing set does not meet the assembly requirements and the bearing rings should be replaced.

5. The assembly and measurement method of a dual-channel tandem bearing according to claim 4, characterized in that: Use a dial indicator to measure h1 and h2, making sure the measuring end of the dial indicator contacts the upper end face of the outer ring.

6. The method for measuring the assembly of a dual-channel tandem bearing according to claim 4 or 5, characterized in that: When grinding the fitting surfaces of the upper inner ring and the lower inner ring, it is sufficient to grind the narrow side end surface of the upper inner ring or the lower inner ring.

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