Center water outlet gear box

Abstract

The utility model relates to the technical field of gear boxes, in particular to a center water outlet gear box which comprises a box body with a cavity, a center shaft is rotatably installed on the box body, a water through hole is formed in the center shaft, one end of the water through hole is an input end, and the other end of the water through hole is an output end. One end of the center shaft is rotatably installed on the box body through an angular contact ball bearing, and the other end of the center shaft is rotatably installed on the box body through a cylindrical roller bearing. When the center water outlet gear box is used, the angular contact ball bearing is arranged at one end of the center shaft, so that the bearing capacity of the center shaft during rotation is guaranteed; and meanwhile, the other end of the central shaft is provided with a cylindrical roller bearing rotating support, the central shaft can axially move during thermal extension, so that the central shaft has a certain displacement space in the axial direction, normal use of the central shaft is not influenced, stable and reliable operation of the central shaft is ensured, and damage to the box body is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to gear box technical field especially is concerned with center water outlet gear box. BACKGROUND

[0002] Gear box is widely used, for example, the application in mechanical processing, gear box is important mechanical parts in mechanical processing, and in mechanical processing needs to cool the tool or processing part, adopts center water outlet gear box, center water outlet gear box includes the center shaft with the water hole in the inside, the existing center shaft is rotatably installed on the gear box through the bearing, makes the center shaft be fixed, because the thermal expansion occurs in the rotation of center shaft, leads to the center shaft unable to elongate, produces stress concentration to the gear box and bearing, long-term can cause the fatigue failure of bearing or gear box, greatly reduces the service life of gear box. SUMMARY

[0003] The utility model solves the technical problems that: in order to solve the existing center shaft rotatably installs on the gear box through the bearing, makes the center shaft be fixed, because the thermal expansion occurs in the rotation of center shaft, leads to the center shaft unable to elongate, produces stress concentration to the gear box and bearing, long-term can cause the fatigue failure of bearing or gear box, greatly reduces the service life of gear box, now provides a center water outlet gear box.

[0004] The utility model solves the technical problems and adopts the technical scheme that: a center water outlet gear box, including the box body with cavity, the center shaft is rotatably installed on the box body, the center shaft has the water hole, one end of the water hole is the input end, the other end of the water hole is the output end, one end of the center shaft is rotatably installed on the box body through the angular contact ball bearing, the other end of the center shaft is rotatably installed on the box body through the cylindrical roller bearing.Compared with the prior art, the angular contact ball bearing is arranged on one end of the center shaft in the scheme, the bearing capacity is guaranteed when the center shaft rotates, the supporting effect is played, the stable and reliable rotation of the center shaft is guaranteed, at the same time, the cylindrical roller bearing is arranged on the other end of the center shaft and rotates to support, when the center shaft is hot and elongated, the axial displacement can be realized, the certain displacement space of the center shaft is realized, the normal use of the center shaft is not affected, the stable and reliable operation of the center shaft is guaranteed, and the damage to the box body is prevented.

[0005] In order to facilitate the installation of the angular contact ball bearing on the box, preferably some embodiments further comprise a lower cover plate, the box is provided with a lower groove, the first through hole is arranged in the lower groove, the first through hole is communicated with the cavity, the angular contact ball bearing is matched with the lower groove, the angular contact ball bearing is arranged in the lower groove, the lower cover plate is fixed on the box, one end of the lower cover plate abuts against the angular contact ball bearing and is used for fixing the angular contact ball bearing on the box, the second through hole is arranged on the lower cover plate, the first through hole and the second through hole are oppositely arranged, the angular contact ball bearing is located between the first through hole and the second through hole, and one end of the center shaft penetrates through the first through hole and the second through hole. By installing the angular contact ball bearing in the lower groove on the box and fixing the angular contact ball bearing on the box through the lower cover plate.

[0006] In order to facilitate the elongation of the center shaft at one end of the cylindrical roller bearing, preferably some embodiments further comprise an upper cover plate, the box is provided with a mounting hole matched with the upper cover plate, the box is provided with an upper groove matched with the cylindrical roller bearing, the cylindrical roller bearing is arranged in the upper groove, the mounting hole is correspondingly communicated with the upper groove, the upper cover plate is installed in the mounting hole, the third through hole matched with the other end of the center shaft is arranged on the upper cover plate, and the other end of the center shaft penetrates through the third through hole and protrudes out of the box. By installing the upper cover plate in the mounting hole and penetrating the other end of the center shaft through the third through hole on the upper cover plate, the elongation of the center shaft at one end of the cylindrical roller bearing is facilitated.

[0007] In order to prevent external dust or sundries from entering the cavity of the box, preferably some embodiments, a first sealing ring is arranged between the upper cover plate and the center shaft.

[0008] Preferably, some embodiments, the upper cover plate is provided with a first sealing groove matched with the first sealing ring, the first sealing ring is arranged in the first sealing groove, and the sealing surface of the first sealing ring is in contact with the outer circumferential surface of the center shaft.

[0009] Preferably, some embodiments, a second sealing ring is arranged between the upper cover plate and the mounting hole.

[0010] Preferably, some embodiments, the outer circumferential surface of the upper cover plate is provided with a second sealing groove, the second sealing ring is arranged in the second sealing groove, and the sealing surface of the second sealing ring is in contact with the inner circumferential surface of the mounting hole.

[0011] The utility model discloses a beneficial effect is: the utility model discloses a center water gear case when using, through the one end of center shaft sets up angular contact ball bearing and guarantees the carrying capacity when center shaft rotates, plays the supporting effect, guarantees that center shaft rotates stable and reliable, simultaneously, the other end of center shaft sets up cylindrical roller bearing rotation support, can axial displacement when center shaft thermal elongation, makes center shaft axial certain displacement space, does not influence the normal use of center shaft, guarantees that center shaft runs stable and reliable, prevents the damage to the box, avoids the existing center shaft through bearing rotation and installs on the gear case, makes center shaft be fixed, because the thermal expansion will occur in the rotation process of center shaft, leads to center shaft and cannot elongate, produces stress concentration to gear case and bearing, long -term will cause bearing or gear case to appear fatigue failure, greatly reduces the service life of gear case problem. BRIEF DESCRIPTION OF DRAWINGS

[0012] The utility model is further explained below in combination with the drawings and examples.

[0013] Figure 1 It is the front view of the utility model;

[0014] Figure 2 It is the plan view of the utility model;

[0015] Figure 3 It is Figure 1 The local enlarged view of A in middle.

[0016] In the drawing: 1, box, 2, cavity body, 3, center shaft, 4, water hole, 5, angular contact ball bearing, 6, cylindrical roller bearing, 7, lower groove, 8, first through -hole, 9, lower cover plate, 10, upper cover plate, 11, mounting hole, 12, upper groove, 13, third through -hole, 14, first sealing ring, 15, first sealing groove, 16, second sealing ring, 17, second sealing groove. DETAILED DESCRIPTION

[0017] The utility model is further explained below in combination with the drawings and examples.

[0018] The utility model is not limited to the following specific embodiments, and the person skilled in the art can implement the utility model according to the content disclosed in the utility model, or any simple change or change is adopted, and falls within the protection scope of the utility model. It should be noted that in the case of no conflict, the examples in the utility model and the features in the examples can be combined with each other.

[0019] In the description of the utility model, it is necessary to understand that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0020] In the description of the utility model, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood through specific circumstances.

[0021] As shown in Figures 1-3 A center water outlet gear box, comprising a box body 1, a lower cover plate 9 and an upper cover plate 10, the box body 1 has a cavity 2, a water hole 4 is formed in the center shaft 3 along the axial direction, the upper end of the water hole 4 is the input end, the lower end of the water hole 4 is the output end, the lower end of the center shaft 3 is rotatably installed on the box body 1 through two angular contact ball bearings 5 arranged side by side, the upper end of the center shaft 3 is rotatably installed on the box body 1 through two cylindrical roller bearings 6 arranged side by side, realizing the rotatable installation of the center shaft 3 on the box body 1;

[0022] A lower groove 7 is formed on the box body 1, a first through hole 8 is arranged in the lower groove 7, the first through hole 8 is communicated with the cavity 2, the angular contact ball bearing 5 is matched with the lower groove 7, the angular contact ball bearing 5 is arranged in the lower groove 7, the lower cover plate 9 is fixed on the box body 1, one end of the lower cover plate 9 abuts on the angular contact ball bearing 5 and is used for fixing the angular contact ball bearing 5 on the box body 1, a second through hole is arranged on the lower cover plate 9, the first through hole 8 and the second through hole are oppositely arranged, the angular contact ball bearing 5 is located between the first through hole 8 and the second through hole, the lower end of the center shaft 3 passes through the first through hole 8 and the second through hole;

[0023] The box body 1 is provided with a mounting hole 11 matched with the upper cover plate 10, the mounting hole 11 is communicated with the cavity body 2, the box body 1 is provided with an upper groove 12 in the cavity body 2, the upper groove 12 is matched with the cylindrical roller bearing 6, the cylindrical roller bearing 6 is arranged in the upper groove 12, the mounting hole 11 is communicated with the upper groove 12, the upper cover plate 10 is arranged in the mounting hole 11, the upper cover plate 10 is provided with a third through hole 13 matched with the upper end of the central shaft 3, the upper end of the central shaft 3 passes through the third through hole 13 and protrudes out of the box body 1.

[0024] The first sealing ring 14 is arranged between the upper cover plate 10 and the central shaft 3, the upper cover plate 10 is provided with a first sealing groove 15 matched with the first sealing ring 14, the first sealing ring 14 is arranged in the first sealing groove 15, and the sealing surface of the first sealing ring 14 is in contact with the outer circumferential surface of the central shaft 3.

[0025] The second sealing ring 16 is arranged between the upper cover plate 10 and the mounting hole 11, the outer circumferential surface of the upper cover plate 10 is provided with a second sealing groove 17, the second sealing ring 16 is arranged in the second sealing groove 17, and the sealing surface of the second sealing ring 16 is in contact with the inner circumferential surface of the mounting hole 11.

[0026] The box body 1 comprises a shell with one side opening and a cover plate, and the cover plate is fixed to the opening end of the shell by screws.

[0027] The above-mentioned central water outlet gear box, when in use, is provided with an angular contact ball bearing 5 and a cylindrical roller bearing 6 at both ends of the central shaft 3, the angular contact ball bearing 5 rotatably supports the lower end of the central shaft 3, thereby ensuring that the central shaft 3 has a certain bearing capacity, and the cylindrical roller bearing 6 rotatably supports the upper end of the central shaft 3, so that the upper end of the central shaft 3 can be heat stretched, thereby realizing stable and reliable axial displacement of the central shaft 3 and avoiding stress concentration of the central shaft 3 on the box body 1 and the bearing due to heat stretching, and thus avoiding fatigue damage again.

[0028] The above-mentioned ideal embodiment according to the present application is an inspiration, and through the above-mentioned description, relevant personnel can make various changes and modifications without deviating from the technical concept of the present application. The technical scope of the present application is not limited to the content in the specification, and must be determined according to the scope of the claims.

Claims

1. A center outlet gear box, comprising a box body (1) with a cavity (2), a center shaft (3) is rotatably installed on the box body (1), the center shaft (3) has a water passage (4), one end of the water passage (4) is an input end, the other end of the water passage (4) is an output end, characterized in that: One end of the central shaft (3) is rotatably mounted on the box (1) through an angular contact ball bearing (5), and the other end of the central shaft (3) is rotatably mounted on the box (1) through a cylindrical roller bearing (6); The angular contact ball bearing (5) is used to ensure the carrying capacity of the central shaft (3) when rotating and to support the central shaft (3), and the cylindrical roller bearing (6) is used to axially displace when the central shaft (3) is hot stretched, so that the central shaft (3) has a certain displacement space in the axial direction.

2. The center take-off gearbox of claim 1, wherein: Further comprising a lower cover plate (9), the box (1) is provided with a lower groove (7), the first through hole (8) is arranged in the lower groove (7), the first through hole (8) is communicated with the cavity (2), the angular contact ball bearing (5) is matched with the lower groove (7), the angular contact ball bearing (5) is arranged in the lower groove (7), the lower cover plate (9) is fixed on the box (1), one end of the lower cover plate (9) abuts on the angular contact ball bearing (5) and is used for fixing the angular contact ball bearing (5) on the box (1), the second through hole is arranged on the lower cover plate (9), the first through hole (8) and the second through hole are oppositely arranged, the angular contact ball bearing (5) is located between the first through hole (8) and the second through hole, and one end of the central shaft (3) passes through the first through hole (8) and the second through hole.

3. A centre water outlet gearbox as claimed in claim 1 or 2, characterised in that: Further comprising an upper cover plate (10), the box (1) is provided with a mounting hole (11) matched with the upper cover plate (10), the box (1) is provided with an upper groove (12), the upper groove (12) is matched with the cylindrical roller bearing (6), the cylindrical roller bearing (6) is arranged in the upper groove (12), the mounting hole (11) corresponds to and communicates with the upper groove (12), the upper cover plate (10) is mounted in the mounting hole (11), the third through hole (13) matched with the other end of the central shaft (3) is arranged on the upper cover plate (10), and the other end of the central shaft (3) passes through the third through hole (13) and protrudes out of the box (1).

4. A centre water outlet gearbox as claimed in claim 3, characterised in that: The first sealing ring (14) is arranged between the upper cover plate (10) and the central shaft (3).

5. A centre water outlet gearbox as claimed in claim 4, characterised in that: The first sealing groove (15) matched with the first sealing ring (14) is arranged on the outer periphery of the upper cover plate (10), the first sealing ring (14) is arranged in the first sealing groove (15), and the sealing surface of the first sealing ring (14) is in contact with the outer periphery of the central shaft (3).

6. A centre water outlet gearbox as claimed in claim 5, characterised in that: The second sealing ring (16) is arranged between the upper cover plate (10) and the mounting hole (11).

7. A centre water outlet gearbox as claimed in claim 6, characterised in that: The second sealing groove (17) is arranged on the outer periphery of the upper cover plate (10), the second sealing ring (16) is arranged in the second sealing groove (17), and the sealing surface of the second sealing ring (16) is in contact with the inner periphery of the mounting hole (11).

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