A nested double-bearing flat pan / tilt motor

Abstract

The present application relates to the technical field of motors, and in particular to a nested double-bearing flattened pan-tilt motor, which includes a first end cover, a second end cover, a connecting end cover arranged between the first end cover and the second end cover, a first connecting shaft arranged on the side of the first end cover close to the second end cover, a first connecting groove arranged on the second end cover for the first connecting shaft to be embedded, a second connecting shaft arranged on the side of the second end cover close to the first end cover, a second connecting groove arranged on the first end cover for the second connecting shaft to be embedded, a first bearing and a second bearing arranged in the second connecting groove, and a supporting assembly for supporting the first bearing and the second bearing, wherein the first bearing is nested in the inner ring of the second bearing, and the second connecting shaft is located between the outer ring of the first bearing and the inner ring of the second bearing. The present application has the effect of realizing the flattened design of the motor while ensuring the performance of the motor.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a nested double-bearing flattened gimbal motor. Background Art

[0002] Brushless motors are widely used in many fields due to their high efficiency, long life and low maintenance costs. However, with the continuous advancement of technology, the performance requirements for brushless motors in various fields are also continuously increasing. Brushless motors still face challenges in pursuing flat design, low speed and high torque output, and high-precision control, especially in applications that require precise guidance and tracking, such as high-precision gimbals, which have more stringent requirements on motor performance.

[0003] In order to improve the load capacity of the motor, the dual-bearing design is widely used in motor design. It has a simple structure and is easy to install. However, with the continuous development of motor technology, higher requirements are placed on the size and performance of the motor. The traditional dual-bearing structure has certain limitations in the flat design of the motor and cannot meet the requirements of modern motors for compact structure and high-efficiency performance. At present, in order to achieve the flat design of the motor, the method of reducing the bearing size is usually adopted. However, this method often sacrifices the stability and durability of the motor, and it is difficult to achieve flatness while maintaining the performance of the motor. This situation needs to be improved. Summary of the invention

[0004] In order to achieve a flattened motor design while ensuring motor performance, the present application provides a nested double-bearing flattened gimbal motor.

[0005] The present application provides a nested double-bearing flat pan / tilt motor, which adopts the following technical solution:

[0006] A nested double-bearing flattened pan-tilt motor comprises a first end cover, a second end cover, a connecting end cover arranged between the first end cover and the second end cover, a first connecting shaft arranged on the side of the first end cover close to the second end cover, a first connecting groove arranged on the second end cover and for the first connecting shaft to be embedded, a second connecting shaft arranged on the side of the second end cover close to the first end cover, a second connecting groove arranged on the first end cover and for the second connecting shaft to be embedded, a first bearing and a second bearing arranged in the second connecting groove, and a supporting assembly for supporting the first bearing and the second bearing, wherein the gap between the second connecting shaft and the first connecting shaft constitutes a first accommodating cavity for the first bearing to be embedded, and the gap between the second connecting shaft and the inner wall of the second connecting groove constitutes a second accommodating cavity for the second bearing to be embedded, so that the first bearing is nested in the inner ring of the second bearing, and the second connecting shaft is located between the outer ring of the first bearing and the inner ring of the second bearing.

[0007] By adopting the above technical solution, a nested double bearing method is adopted, in which the first bearing is nested in the inner ring of the second bearing, and the first bearing and the second bearing are supported by a support assembly. When the motor starts, force is applied to the bearing, and through the nesting between the bearings and the action of the support assembly, these forces can be circulated, thereby reducing or eliminating the virtual position of the bearing. This design helps to improve the stability and performance of the system and extend the service life of the bearing. Compared with the prior art, in order to improve the load capacity of the motor, a parallel double bearing design is adopted, which leads to certain limitations in the flattening design of the motor. The solution in this application adopts a nested double bearing method to achieve a flattening design of the motor while ensuring the performance of the motor.

[0008] Optionally, a fixed shaft is provided in the first connecting groove, and the fixed shaft is fixedly sleeved on the first connecting shaft. The support assembly includes a first support portion provided on the fixed shaft and used to support the first bearing, a second support portion provided on the side of the second connecting shaft away from the first support portion and used to support the first bearing, a third support portion provided on the side wall of the second connecting groove and used to support the second bearing, and a fourth support portion provided on the side of the second connecting shaft away from the third support portion and used to support the second bearing. The first support portion and the second support portion are diagonally arranged, and the third support portion and the fourth support portion are diagonally arranged.

[0009] By adopting the above technical solution, the first bearing is supported by the first support part and the second support part, and the second bearing is supported by the third support part and the fourth support part. The first support part and the second support part are diagonally arranged, and the third support part and the fourth support part are diagonally arranged. The support assembly is designed to absorb and disperse the impact force generated by the motor, thereby reducing damage to the entire system and making the force transmission more uniform.

[0010] Optionally, the outer ring sleeve of the second connecting shaft is provided with a bearing gasket.

[0011] By adopting the above technical solution, the bearing gasket can correctly bear the load and rotational force during operation. By replacing bearing gaskets of different thicknesses, the bearing clearance can be fine-tuned to prevent axial deviation from affecting the normal operation of the motor, effectively eliminate the possible void space during the bearing installation process, and ensure the normal operation and stable performance of the motor.

[0012] Optionally, the inner ring of the fixed shaft is threadedly connected to the outer ring of the first connecting shaft, and a plurality of mounting holes are provided on the fixed shaft. The fixed shaft is fixedly connected to the external device after self-tapping screws pass through the mounting holes.

[0013] By adopting the above technical solution, the inner ring of the fixed shaft has an external thread, and the outer ring of the first connecting shaft has an internal thread, and the fixed shaft and the first connecting shaft are connected to each other through the thread; a plurality of mounting holes are opened on the fixed shaft, and the function of these mounting holes is used to connect with external equipment. In order to connect the fixed shaft to the external equipment, the self-tapping screws are passed through the mounting holes on the fixed shaft and threaded into the surface of the external equipment to fix the connection and ensure the stability and reliability of the motor. The self-tapping screws usually have a sharp tip and can drill holes directly on the surface of the material and cut threads by themselves, so there is no need to drill holes in advance.

[0014] Optionally, the first connecting shaft is provided with a threading hole for the cable to pass through, so that the first connecting shaft is a hollow shaft.

[0015] By adopting the above technical solution, the first connecting shaft is a hollow shaft, which means that its internal space is empty rather than solid. This design allows the internal space of the shaft (i.e., the threading hole) to be used to transmit signals, power or control signals through wires, cables or other cables, which can make cable wiring neater and more efficient, and can reduce the risk of cable damage or entanglement.

[0016] Optionally, a rotor is further included, and a separation shaft is provided on the side of the first end cover close to the second end cover, the inner ring of the separation shaft is tightly pressed against the outer ring of the second bearing, and the separation shaft and the inner cavity of the first end cover constitute a third accommodating cavity for placing the rotor.

[0017] By adopting the above technical solution, a third accommodating cavity is formed between the partition shaft and the inner cavity of the first end cover for accommodating the rotor. This accommodating cavity may be used to place the rotor and provide support to ensure that the rotor remains stable during operation. By placing the rotor in the third accommodating cavity and utilizing the design of the partition shaft, the rotor can be ensured to remain stable during operation and reduce friction and interference with other internal components, which helps to improve the performance and reliability of the mechanical device.

[0018] Optionally, the rotor includes a turntable sleeved on the outer ring of the separation shaft, and a plurality of magnets disposed on the turntable, wherein the plurality of magnets are evenly arranged around the center of the turntable.

[0019] By adopting the above technical solution, the magnets are evenly arranged on the turntable, which means that they are distributed at the same intervals around the turntable. This uniform arrangement helps to ensure the stability and uniformity of the magnetic field when the rotor rotates, thereby improving the performance and efficiency of the equipment.

[0020] Optionally, the connecting end cover is provided with a first mounting groove for the first end cover to be embedded, the connecting end cover is provided with a second mounting groove for the second end cover to be embedded, the first end cover is provided with a first fixing hole, the first end cover is fixedly connected to the connecting end cover after a first screw passes through the first fixing hole, and the second end cover is provided with a second fixing hole, and the second end cover is fixedly connected to the connecting end cover after a second screw passes through the second fixing hole.

[0021] By adopting the above technical solution, the first end cover is fixedly connected to the connecting end cover after the first screw passes through the first fixing hole, and the second end cover is fixedly connected to the connecting end cover after the second screw passes through the second fixing hole. By using the first screw and the second screw, the first end cover and the second end cover are fixedly connected to the connecting end cover, and the screws (the first screw and / or the second screw) are fixed to the connecting end cover by threads after passing through their respective fixing holes, thereby ensuring a firm connection between the end cover (the first end cover and / or the second end cover) and the connecting end cover.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. A nested double bearing is adopted, where the first bearing is nested in the inner ring of the second bearing, and the first bearing and the second bearing are supported by a support assembly. When the motor is started, force is applied to the bearing, and through the nesting between the bearings and the action of the support assembly, these forces can be circulated and transmitted, thereby reducing or eliminating the virtual position of the bearing. This design helps to improve the stability and performance of the system and extend the service life of the bearing. Compared with the prior art, in order to improve the load capacity of the motor, a parallel double bearing design is adopted, resulting in certain limitations in the motor flattening design. The solution in this application adopts a nested double bearing method to achieve a motor flattening design while ensuring the motor performance;

[0024] 2. The first bearing is supported by the first support part and the second support part, and the second bearing is supported by the third support part and the fourth support part. The first support part and the second support part are diagonally arranged, and the third support part and the fourth support part are diagonally arranged. The support assembly is designed to absorb and disperse the impact force generated by the motor, thereby reducing damage to the entire system and making the force transmission more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is an exploded view of the first end cover and the connecting end cover in the embodiment of the present application;

[0026] Figure 2 is an exploded view of the second end cover and the connecting end cover in the embodiment of the present application;

[0027] Figure 3is a cross-sectional view of a pan / tilt motor in an embodiment of the present application;

[0028] Figure 4 It is a schematic diagram of the overall structure in the embodiment of the present application;

[0029] Figure 5 In the embodiment of this application Figure 3 Enlarged view of part A.

[0030] Description of reference numerals:

[0031] 1. First end cover; 2. Second end cover; 3. Connecting end cover; 4. First connecting shaft; 5. First connecting groove; 6. Second connecting shaft; 7. Second connecting groove; 8. First bearing; 9. Second bearing; 10. Support assembly; 11. First accommodating chamber; 12. Second accommodating chamber; 13. Fixed shaft; 14. First supporting part; 15. Second supporting part; 16. Third supporting part; 17. Fourth supporting part; 18. Bearing gasket; 19. Mounting hole; 20. Threading hole; 21. Rotor; 22. Separating shaft; 23. Third accommodating chamber; 24. Turntable; 25. Magnetic steel; 26. First mounting groove; 27. Second mounting groove; 28. First fixing hole; 29. ​​Second fixing hole. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0033] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0036] The embodiment of the present application discloses a nested dual-bearing flattened pan-tilt motor.

[0037] Reference Figure 1 and Figure 2 A nested double-bearing flattened pan / tilt motor comprises a first end cover 1, a second end cover 2, a connecting end cover 3, a first connecting shaft 4, a first connecting groove 5, a second connecting shaft 6, a second connecting groove 7, a first bearing 8, a second bearing 9, and a rotor 21. The connecting end cover 3 is located between the first end cover 1 and the second end cover 2, and is used to connect the first end cover 1 and the second end cover 2. The connecting end cover 3 is provided with a first mounting groove 26 for the first end cover 1 to be embedded and a second mounting groove 27 for the second end cover 2 to be embedded. The first end cover 1 is provided with a first fixing hole 28, and the second end cover 2 is provided with a second fixing hole 29. After the first end cover 1 is embedded in the first mounting groove 26 and the second end cover 2 is embedded in the second mounting groove 27, the first end cover 1 is fixedly connected to the connecting end cover 3 by passing the first screw (not shown in the figure) through the first fixing hole 28, and the second end cover 2 is fixedly connected to the connecting end cover 3 by passing the second screw (not shown in the figure) through the second fixing hole 29. By using the first screw and the second screw, the first end cover 1 and the second end cover 2 are fixedly connected to the connecting end cover 3, thereby ensuring a firm connection between the end cover (the first end cover 1 and / or the second end cover 2) and the connecting end cover 3. The above describes the assembly of the motor housing. For ease of understanding, the inner cavity structure of the motor is specifically described below:

[0038] like Figure 2 and Figure 3As shown, the first connecting shaft 4 is fixed on the side of the first end cover 1 close to the second end cover 2, the first connecting groove 5 is opened on the second end cover 2 and is provided for the first connecting shaft 4 to be embedded, the second connecting shaft 6 is fixed on the side of the second end cover 2 close to the first end cover 1, the second connecting groove 7 is opened on the first end cover 1 and is provided for the second connecting shaft 6 to be embedded, and the first bearing 8 and the second bearing 9 are located in the second connecting groove 7; the gap between the second connecting shaft 6 and the second connecting shaft 6 constitutes a first accommodating cavity 11 for the first bearing 8 to be embedded, and the gap between the second connecting shaft 6 and the inside of the second connecting groove 7 constitutes a second accommodating cavity 12 for the second bearing 9 to be embedded, so that the first bearing 8 is nested in the inner ring of the first bearing 8, the second connecting shaft 6 is located between the outer ring of the first bearing 8 and the inner ring of the second bearing 9, and the first bearing 8 and the second bearing 9 are supported by the support assembly 10; a separating shaft 22 is fixed on the side of the first end cover 1 close to the second end cover 2, the inner ring of the separating shaft 22 is pressed against the outer ring of the second bearing 9, and the separating shaft 22 and the inner cavity of the first end cover 1 constitute a third accommodating cavity 23 for placing the rotor 21. The present application adopts a nested double bearing approach, in which the first bearing 8 is nested in the inner ring of the second bearing 9, and the first bearing 8 and the second bearing 9 are supported by a support assembly 10. When the motor starts, force is applied to the bearings (the first bearing 8 and the second bearing 9), and through the nesting between the bearings (the first bearing 8 and the second bearing 9) and the action of the support assembly 10, these forces can be circulated and transmitted, thereby reducing or eliminating the virtual position of the bearings. This design helps to improve the stability and performance of the system and extend the service life of the bearings.

[0039] By placing the rotor 21 in the third accommodating cavity 23 and utilizing the design of the separating shaft 22, it is possible to ensure that the rotor 21 remains stable during operation and reduce friction and interference with other internal components, which helps to improve the performance and reliability of the motor. The rotor 21 includes a turntable 24 and a plurality of magnets 25. The turntable 24 is sleeved on the outer ring of the separating shaft 22, and the plurality of magnets 25 are mounted on the turntable 24. The plurality of magnets 25 are evenly arranged around the center of the turntable 24, which means that the plurality of magnets 25 are distributed at the same intervals around the turntable 24. This uniform arrangement helps to ensure the stability and uniformity of the magnetic field of the rotor 21 when it rotates, thereby improving the performance and efficiency of the equipment.

[0040] In one embodiment, Figure 3 and Figure 4 As shown, the first connecting shaft 4 is provided with a threading hole 20 for the cable to pass through, so that the first connecting shaft 4 is a hollow shaft, which means that the internal space of the first connecting shaft 4 is hollow, that is, the internal space is the threading hole 20. The threading hole 20 can be used to transmit signals, power or control signals through wires, cables or other cables, which can make cable wiring neater and more efficient, and can reduce the risk of cable damage or entanglement.

[0041] Reference Figure 5 A fixed shaft 13 is installed in the first connecting groove 5, and the fixed shaft 13 is fixedly sleeved on the first connecting shaft 4. The support assembly 10 includes a first support portion 14, a second support portion 15, a third support portion 16 and a fourth support portion 17. Specifically, the first support portion 14 is fixed on the fixed shaft 13 and is used to support the first bearing 8, the second support portion 15 is fixed on the side of the second connecting shaft 6 away from the first support portion 14 and is used to support the first bearing 8, the third support portion 16 is fixed on the side wall of the second connecting groove 7 and is used to support the second bearing 9, and the fourth support portion 17 is fixed on the side of the second connecting shaft 6 away from the third support portion 16 and is used to support the second bearing 9. The first bearing 8 is supported by the first support portion 14 and the second support portion 15, and the second bearing 9 is supported by the third support portion 16 and the fourth support portion 17. The first support portion 14 and the second support portion 15 are diagonally arranged, and the third support portion 16 and the fourth support portion 17 are diagonally arranged. The support assembly 10 is designed to absorb and disperse the impact force generated by the motor, thereby reducing damage to the entire system and making the force transmission more uniform.

[0042] In order to further ensure the normal operation and performance stability of the motor, a bearing gasket 18 is provided on the outer ring of the second connecting shaft 6. During operation, the bearing gasket 18 can correctly bear the load and rotational force. By replacing the bearing gaskets 18 of different thicknesses, the bearing clearance can be fine-tuned to prevent axial deviation from affecting the normal operation of the motor and effectively eliminate the possible void space during the bearing installation process.

[0043] Reference Figure 4 and Figure 5 The inner ring of the fixed shaft 13 is threadedly connected to the outer ring of the first connecting shaft 4, that is, the inner ring of the fixed shaft 13 has an external thread, and the outer ring of the first connecting shaft 4 has an internal thread. The fixed shaft 13 and the first connecting shaft 4 are connected to each other through threads. A plurality of mounting holes 19 are provided on the fixed shaft 13. The function of these mounting holes 19 is to connect with external equipment. In order to connect the fixed shaft 13 to the external equipment, self-tapping screws (not shown in the figure) are passed through the mounting holes 19 on the fixed shaft 13 and threaded into the surface of the external equipment to fix the connection and ensure the stability and reliability of the motor. Self-tapping screws usually have sharp tips and can directly drill holes on the surface of the material and cut threads by themselves, so there is no need to drill holes in advance.

[0044] The implementation principle of a nested dual-bearing flattened pan-tilt motor in an embodiment of the present application is as follows: a nested dual-bearing method is adopted, wherein the first bearing 8 is nested in the inner ring of the second bearing 9, and the first bearing 8 and the second bearing 9 are supported by a support assembly 10. When the motor starts, force is applied to the bearings, and through the nesting between the bearings and the action of the support assembly 10, these forces can be circulated and transmitted, thereby reducing or eliminating the virtual position of the bearings. This design helps to improve the stability and performance of the system and extend the service life of the bearings. Compared with the prior art, a parallel dual-bearing design is adopted to improve the load capacity of the motor, resulting in certain limitations in the motor flattening design. The solution in the present application adopts a nested dual-bearing method to achieve a motor flattening design while ensuring the motor performance.

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A nested double-bearing flattened pan / tilt motor, characterized in that: The invention comprises a first end cover (1), a second end cover (2), a connecting end cover (3) arranged between the first end cover (1) and the second end cover (2), a first connecting shaft (4) arranged on the side of the first end cover (1) close to the second end cover (2), a first connecting groove (5) arranged on the second end cover (2) and for the first connecting shaft (4) to be embedded, a second connecting shaft (6) arranged on the side of the second end cover (2) close to the first end cover (1), a second connecting groove (7) arranged on the first end cover (1) and for the second connecting shaft (6) to be embedded, a first bearing (8) and a second bearing (9) arranged in the second connecting groove (7), and a supporting assembly (10) for supporting the first bearing (8) and the second bearing (9), wherein the gap between the second connecting shaft (6) and the first connecting shaft (4) constitutes a first accommodating cavity (11) for the first bearing (8) to be embedded, and the gap between the second connecting shaft (6) and the inner wall of the second connecting groove (7) constitutes a second accommodating cavity (12) for the second bearing (9) to be embedded, so that the first shaft (6) The bearing (8) is nested in the inner ring of the second bearing (9), and the second connecting shaft (6) is located between the outer ring of the first bearing (8) and the inner ring of the second bearing (9); a fixed shaft (13) is arranged in the first connecting groove (5), and the fixed shaft (13) is fixedly sleeved on the first connecting shaft (4); the supporting assembly (10) comprises a first supporting portion (14) arranged on the fixed shaft (13) and used to support the first bearing (8), a second supporting portion (15) arranged on a side of the second connecting shaft (6) away from the first supporting portion (14) and used to support the first bearing (8), a third supporting portion (16) arranged on a side wall of the second connecting groove (7) and used to support the second bearing (9), and a fourth supporting portion (17) arranged on a side of the second connecting shaft (6) away from the third supporting portion (16) and used to support the second bearing (9), the first supporting portion (14) and the second supporting portion (15) are arranged diagonally, and the third supporting portion (16) and the fourth supporting portion (17) are arranged diagonally.

2. A nested double-bearing flattened pan / tilt motor according to claim 1, characterized in that: The outer ring sleeve of the second connecting shaft (6) is provided with a bearing washer (18).

3. The nested double-bearing flattened pan / tilt motor according to claim 1, characterized in that: The inner ring of the fixed shaft (13) is threadedly connected to the outer ring of the first connecting shaft (4); a plurality of mounting holes (19) are provided on the fixed shaft (13); and the fixed shaft (13) is fixedly connected to an external device by self-tapping screws passing through the mounting holes (19).

4. The nested double-bearing flattened pan / tilt motor according to claim 1, characterized in that: The first connecting shaft (4) is provided with a threading hole (20) for the cable to pass through, so that the first connecting shaft (4) is a hollow shaft.

5. The nested double-bearing flattened pan / tilt motor according to claim 1, characterized in that: It also includes a rotor (21), a separation shaft (22) being arranged on the side of the first end cover (1) close to the second end cover (2), the inner ring of the separation shaft (22) being tightly abutted against the outer ring of the second bearing (9), and the separation shaft (22) and the inner cavity of the first end cover (1) forming a third accommodating cavity (23) for accommodating the rotor (21).

6. The nested double-bearing flattened pan / tilt motor according to claim 5, characterized in that: The rotor (21) comprises a turntable (24) sleeved on the outer ring of the separation shaft (22), and a plurality of magnetic steels (25) arranged on the turntable (24), wherein the plurality of magnetic steels (25) are evenly arranged around the center of the turntable (24).

7. The nested double-bearing flattened pan / tilt motor according to claim 1, characterized in that: The connecting end cover (3) is provided with a first mounting groove (26) for the first end cover (1) to be embedded in, and the connecting end cover (3) is provided with a second mounting groove (27) for the second end cover (2) to be embedded in, the first end cover (1) is provided with a first fixing hole (28), and the first end cover (1) is fixedly connected to the connecting end cover (3) by a first screw passing through the first fixing hole (28), and the second end cover (2) is provided with a second fixing hole (29), and the second end cover (2) is fixedly connected to the connecting end cover (3) by a second screw passing through the second fixing hole (29).

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