Wheel speed reducer

Abstract

The utility model provides a wheel speed reducer, and belongs to the technical field of speed reducers. The technical problem that an existing wheel speed reducer is large in oil leakage probability is solved. A wheel speed reducer comprises a box body and an upper cover, a mounting cavity for mounting a worm and a worm gear is formed in the box body, the worm gear is fixedly connected with a rotating shaft, the rotating shaft extends out of the upper cover, the upper end of the box body is fixedly connected with an expansion chamber, and the expansion chamber comprises two parallel flat plate parts and an arc part smoothly connected with the two flat plate parts. An expansion cavity similar to the expansion chamber in shape is formed in the expansion chamber, and an elastic expansion piece is arranged between the expansion cavity and the installation cavity. The expansion chamber has an air hole. The expansion chamber is composed of a flat plate part and an arc part to form a long-strip column shape matched with the maximum space of the box body, and the expansion chamber has the equal wall thickness, so that the expansion cavity is similar to the expansion chamber in appearance, and the capacity is larger. The elastic expansion piece expands and contracts along with the change of air pressure, the running internal pressure is adjusted by adjusting the volume in the mounting cavity, the service life of the oil seal is prolonged, and the probability of oil leakage is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of speed reducers, in particular to a wheel speed reducer. Background Art

[0002] Sprinklers are irrigation machines that use water pumps and pipe systems or natural water sources to spray water with a certain pressure into the air, which is dispersed into small water droplets or forms mist and falls on plants and the ground. The wheel reducer in the sprinkler is installed between the tire and the equipment. The use of a wheel reducer can meet the use conditions and ensure durability. In the prior art, for example, Patent No. 2011205474237 is a two-stage reduction box used in agricultural irrigation drive equipment. It discloses that the worm gear box has an oil storage chamber for storing lubricating oil, the rotating shaft needs to pass through the worm gear box and be rotatably connected to the connecting plate, and the seal is set at the port of the worm gear box, which is easy to cause oil leakage. Summary of the invention

[0003] In view of the deficiencies in the prior art, the utility model aims to provide a wheel reducer which can reduce the probability of oil leakage.

[0004] The purpose of the utility model can be achieved through the following technical solutions: A wheel reducer, including a box body and an upper cover that are fixedly connected, the box body has an installation cavity for installing a worm and a worm wheel, the worm wheel is fixedly connected to a rotating shaft, the rotating shaft extends out of the upper cover, the upper end of the box body is fixedly connected to an expansion chamber, the expansion chamber includes two parallel flat parts and an arc part that smoothly connects the two flat parts, the expansion chamber has an expansion cavity similar to the shape of the expansion chamber, and an elastic expansion piece is blocked between the expansion cavity and the installation cavity. The expansion chamber has air holes. The expansion chamber is composed of a flat part and an arc part to form a long column shape that fits the maximum space of the box body, and the expansion chamber has a wall thickness of equal thickness, so that the expansion chamber is close to the expansion chamber in shape and has a larger capacity. The elastic expansion piece expands and contracts with the change of air pressure, and the volume in the installation cavity is adjusted to adjust the operating internal pressure, thereby extending the service life of the oil seal and reducing the probability of oil leakage.

[0005] Furthermore, the elastic expansion member includes an annular hump protruding toward the expansion chamber, the inner circumference of the annular hump is smoothly connected to a flat portion, and the outer circumference is smoothly connected to an annular portion, the annular portion is fixed between the expansion chamber and the box body, and the width of the flat portion is greater than the width of the annular hump.

[0006] Furthermore, the annular portion has a semicircular protrusion protruding toward the expansion chamber, and the expansion chamber is provided with a sealing groove relative to the semicircular protrusion.

[0007] Furthermore, both ends of the box body are fixedly connected to a front box cover and a rear box cover respectively. Both ends of the worm extend out of the front box cover and the rear box cover. A pair of tapered roller bearings I are arranged between the worm and the box body. A cartridge oil seal I and a cartridge oil seal II are arranged between the front box cover and the rear box cover and the worm respectively.

[0008] Furthermore, a protective sleeve capable of hermetically surrounding the end of the worm is fixedly connected to the outside of the rear box cover.

[0009] Furthermore, the front box cover is provided with a circular ring step portion I protruding inwards. A seal I is arranged on the outside of the circular ring step portion I, and the inside thereof abuts against the end face of the cartridge oil seal I. The rear box cover is provided with a circular ring step portion II protruding inwards. A seal II is arranged on the outside of the circular ring step portion II, and the inside thereof abuts against the end face of the cartridge oil seal II.

[0010] Furthermore, the upper cover is in a conical shape. The top of the upper cover has a mounting hole for the rotating shaft to pass through. A tapered roller bearing II is fixedly arranged between one end of the rotating shaft and the box body. A tapered roller bearing III is fixedly arranged between the other end of the rotating shaft and the upper cover. A cartridge oil seal III is fixedly arranged between the other end of the rotating shaft and the upper cover. The cartridge oil seal III is located outside the tapered roller bearing III.

[0011] Furthermore, the mounting hole protrudes inwards with a circular ring step portion III. A seal III is arranged on the outside of the circular ring step portion III, and the inside thereof abuts against the end face of the cartridge oil seal III.

[0012] Compared with the prior art, the technical effects of the present utility model are as follows: First, the space of the expansion chamber is increased by the flat portion and the arc portion. The arc arch shape formed by the flat portion and the arc portion is not prone to stress concentration, which supports and protects the structure of the elastic expansion member, making the force thereon uniform. The increased large-space expansion chamber can increase the expansion space of the elastic expansion member, reduce the internal operating pressure inside the wheel speed reducer, extend the service life of the oil seal, and reduce the probability of oil leakage.

[0013] Second, all the oil seals are located inside the box body and the upper cover, which improves the stability of the oil seal during operation and enhances the sealing effect. Description of the Drawings

[0014] Figure 1 is a sectional view of the present utility model.

[0015] Figure 2 is a sectional view of the present utility model in another direction.

[0016] Figure 3 is an enlarged view of A-A of the present utility model.

[0017] Figure number markings: 1. Box body; 101. Installation cavity; 2. Worm; 3. Worm gear; 4. Rotating shaft; 5. Upper cover; 501. Installation hole; 502. Third annular step portion; 6. Expansion chamber; 601. Flat portion; 602. Arc portion; 603. Expansion cavity; 605. Sealing groove; 7. Elastic expansion member; 701. Annular hump; 702. Flat portion; 703. Annular portion; 704. Semi-circular convex block; 8. Front box cover; 801. First annular step portion; 9. Rear box cover; 901. Second annular step portion; 10. First tapered roller bearing; 11. First cartridge oil seal; 12. Second cartridge oil seal; 13. First seal; 14. Second seal; 15. Second tapered roller bearing; 16. Third tapered roller bearing; 17. Third cartridge oil seal; 18. Third seal; 19. Protective sleeve. Specific embodiments

[0018] The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0019] It should be noted that the descriptions of the present invention in terms of directions such as "upper", "lower", "left", "right", "top", "bottom", etc. are all defined based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device must be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention.

[0020] According to Figures 1 to 3 As shown: A wheel speed reducer uses the meshing transmission of a worm gear and a worm 2 to reduce the rotational speed of a high-speed motor and provide a suitable operating speed to the driven device. It mainly includes a box body 1 and an upper cover 5, and the box body 1 and the upper cover 5 are fixedly connected by fixing parts such as bolts. A closed cavity is formed inside the box body 1 and the upper cover 5, and the cavity inside the box body 1, namely the installation cavity 101, is used to install the worm 2 and the worm gear 3. The worm gear 3 is fixedly connected with a rotating shaft 4, a part of the rotating shaft 4 is also located inside the cavity of the upper cover 5, and the rotating shaft 4 extends out of the upper cover 5.

[0021] Wherein, the two ends of the box body 1 are respectively fixedly connected with a front box cover 8 and a rear box cover 9, the two ends of the worm 2 respectively extend out of the front box cover 8 and the rear box cover 9, a pair of first tapered roller bearings 10 are arranged between the worm 2 and the box body 1, and a first cartridge oil seal 11 and a second cartridge oil seal 12 are respectively arranged between the front box cover 8 and the rear box cover 9 and the worm 2. The first cartridge oil seal 11 and the second cartridge oil seal 12 are both located outside the first tapered roller bearing 10.

[0022] The front cover 8 is provided with a circular ring step portion one 801 protruding inwards. A seal one 13 is arranged on the outer side of the circular ring step portion one 801, and the inner side abuts against the end face of the cartridge oil seal one 11. The rear cover 9 is provided with a circular ring step portion two 901 protruding inwards. A seal two 14 is arranged on the outer side of the circular ring step portion two 901, and the inner side abuts against the end face of the cartridge oil seal two 12.

[0023] A protective sleeve 19 is fixedly connected to the outside of the rear cover 9, and the protective sleeve 19 seals and surrounds one end of the worm 2.

[0024] The upper cover 5 is conical in shape. The top of the upper cover 5 has a mounting hole 501 for the rotating shaft 4 to pass through. The mounting hole 501 is a through hole. A tapered roller bearing two 15 is fixedly arranged between one end of the rotating shaft 4 and the box body 1. A tapered roller bearing three 16 is fixedly arranged between the other end of the rotating shaft 4 and the upper cover 5. A cartridge oil seal three 17 is fixedly arranged between the other end of the rotating shaft 4 and the upper cover 5. The cartridge oil seal three 17 is located outside the tapered roller bearing three 16. An inner circular ring step portion three 502 protrudes from the mounting hole 501. A seal three 18 is arranged on the outer side of the circular ring step portion three 502, and the inner side abuts against the end face of the cartridge oil seal three 17.

[0025] An expansion chamber 6 is also fixedly connected to the upper end of the box body 1. The expansion chamber 6 includes two parallel flat portions 601 and an arc portion 602 that smoothly connects the two flat portions 601. An expansion cavity 603 similar in shape to the expansion chamber 6 is provided inside the expansion chamber 6. An elastic expansion member 7 is provided between the expansion cavity 603 and the installation cavity 101. The expansion chamber 6 is formed by the flat portion 601 and the arc portion 602 into a long strip column shape that fits the maximum space of the box body 1. The expansion chamber 6 has a wall thickness of equal thickness, making the expansion cavity 603 close to the outer shape of the expansion chamber 6 and having a larger capacity.

[0026] The elastic expansion member 7 includes an annular hump 701 protruding into the expansion chamber 6. A flat portion 702 is smoothly connected to the inner circumference of the annular hump 701, and an annular portion 703 is smoothly connected to the outer circumference. The annular portion 703 is fixed between the expansion chamber 6 and the box body 1. The width of the flat portion 702 is greater than the width of the annular hump 701. A semi-circular convex block 704 protrudes from the annular portion 703 towards the expansion chamber 6. A seal groove 605 is provided on the expansion chamber 6 relative to the semi-circular convex block 704.

[0027] The increased large-space expansion chamber 6 can reduce the internal operating pressure inside the wheel speed reducer, extend the service life of the oil seal, and reduce the probability of oil leakage.

[0028] The above embodiments are only the preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope defined by the claims of the present invention.

Claims

1. A wheel speed reducer, comprising a box body (1) and an upper cover (5) fixedly connected. An installation cavity (101) for installing a worm (2) and a worm wheel (3) is provided inside the box body (1). The worm wheel (3) is fixedly connected with a rotating shaft (4), and the rotating shaft (4) extends out of the upper cover (5). It is characterized in that: The upper end of the box body (1) is fixedly connected with an expansion chamber (6). The expansion chamber (6) includes two parallel flat parts (601) and an arc part (602) that smoothly connects the two flat parts (601). An expansion cavity (603) similar in shape to the expansion chamber (6) is provided inside the expansion chamber (6). An elastic expansion member (7) is interposed between the expansion cavity (603) and the installation cavity (101).

2. The wheel speed reducer according to claim 1, wherein: The elastic expansion member (7) includes an annular hump (701) protruding into the expansion chamber (6). A flat part (702) is smoothly connected to the inner circumference of the annular hump (701), and an annular part (703) is smoothly connected to the outer circumference. The annular part (703) is fixed between the expansion chamber (6) and the box body (1). The width of the flat part (702) is greater than the width of the annular hump (701).

3. The wheel speed reducer according to claim 2, characterized in that: The annular part (703) protrudes a semi-circular convex block (704) towards the expansion chamber (6). A sealing groove (605) is provided on the expansion chamber (6) corresponding to the semi-circular convex block (704).

4. A wheel speed reducer according to any one of claims 1 to 3, characterized in that: The front box cover (8) and the rear box cover (9) are respectively fixedly connected to both ends of the box body (1). Both ends of the worm (2) extend out of the front box cover (8) and the rear box cover (9). A pair of tapered roller bearings one (10) are provided between the worm (2) and the box body (1). A cartridge oil seal one (11) and a cartridge oil seal two (12) are respectively provided between the front box cover (8) and the rear box cover (9) and the worm (2).

5. The wheel speed reducer according to claim 4, characterized in that: A protective sleeve (19) that can hermetically surround the end of the worm (2) is fixedly connected to the outside of the rear box cover (9).

6. The wheel speed reducer according to claim 4, characterized in that: The front box cover (8) is provided with an inwardly protruding circular ring step one (801). A seal one (13) is provided on the outside of the circular ring step one (801), and the inner side abuts against the end face of the cartridge oil seal one (11). The rear box cover (9) is provided with an inwardly protruding circular ring step two (901). A seal two (14) is provided on the outside of the circular ring step two (901), and the inner side abuts against the end face of the cartridge oil seal two (12).

7. A wheel speed reducer according to any one of claims 1 to 3, characterized in that: The upper cover (5) is in a conical shape. The top of the upper cover (5) has an installation hole (501) for the rotating shaft (4) to pass through. A tapered roller bearing two (15) is fixedly provided between one end of the rotating shaft (4) and the box body (1). A tapered roller bearing three (16) is fixedly provided between the other end of the rotating shaft (4) and the upper cover (5). A cartridge oil seal three (17) is fixedly provided between the other end of the rotating shaft (4) and the upper cover (5). The cartridge oil seal three (17) is located outside the tapered roller bearing three (16).

8. A wheel speed reducer according to claim 7, characterized in that: The installation hole (501) is inwardly protruding with a circular ring step three (502). A seal three (18) is provided on the outside of the circular ring step three (502), and the inner side abuts against the end face of the cartridge oil seal three (17).

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