Gear shifting mechanism and internal transmission

Abstract

The utility model relates to the technical field of internal transmissions, and discloses a gear shifting mechanism, which comprises a pawl control ring and a pawl seat sleeved on a mandrel, the pawl control ring is provided with an open slot for controlling a pawl to open or close, the pawl seat is provided with a pawl slot for accommodating the pawl, the pawl seat is mounted at the tail end of the pawl control ring, and the pawl control ring is provided with a pawl groove for accommodating the pawl. The pawl seat and the pawl control ring rotate relative to each other around the axis. The independent pawl seat at the tail end can provide a mounting position for the pawl control ring, so that the pawl control ring not only can control the pawls, but also can support the smallest sun gear, and the sun gear does not need to wrap the pawls, the pawl seat and the pawl control ring at the same radial position at the same time, so that the sun gear can obtain a smaller size; the corresponding planetary gear obtains a larger space, the gear shifting stage number can obtain a larger range, and the radial space of the whole inner transmission can become smaller. The utility model further discloses an internal transmission comprising the gear shifting mechanism.

Description

Technical Field

[0001] The utility model relates to the technical field of internal transmissions, in particular to a gear shifting mechanism and an internal transmission. Background Art

[0002] The sun gear of the traditional internal transmission shift mechanism is wrapped with a pawl, a pawl seat and a pawl control ring, and needs to provide movement space for the opening and closing of the pawl, which makes it impossible to miniaturize the sun gear. The corresponding planetary gear space is limited, and the number of gear shifting levels is also limited. The entire internal transmission occupies a large radial space and cannot meet the needs of smaller and more gear shifting. If the shaft diameter of the mandrel is reduced to provide more movement space, the mandrel cannot withstand the large load and breaks, posing a serious safety hazard.

[0003] Therefore, it is necessary to propose a new type of shifting mechanism and internal transmission that solves the above problems, and solves the problems that the sun gear of the traditional internal transmission cannot be miniaturized, the corresponding planetary gear space is limited, the number of gear shifting stages is also limited, the entire internal transmission occupies a large radial space, and cannot meet the needs of smaller and more gear shifting stages. Summary of the invention

[0004] The utility model provides a shift mechanism and an internal transmission, which solve the problems of a traditional internal transmission in which the sun gear cannot be miniaturized, the corresponding planetary gear space is limited, the number of gear stages is also limited, the entire internal transmission occupies a large radial space, and the demand for smaller and more gear stages cannot be met.

[0005] The technical problem solved by the utility model is achieved by the following technical solutions:

[0006] A shift mechanism includes a pawl control ring and a pawl seat sleeved on a core shaft, the pawl control ring is provided with an open groove for controlling the opening or retraction of the pawl, the pawl seat is provided with a pawl groove for accommodating the pawl, the pawl seat is installed at the end of the pawl control ring, and the pawl control ring can rotate around an axis relative to the pawl seat.

[0007] Furthermore, the pawl groove includes a locking section for accommodating the pawl locking portion, and the position of the locking section is staggered with the position of the external teeth of the sun gear.

[0008] Furthermore, it also includes a core shaft, and the pawl control ring and the pawl seat are respectively sleeved on the core shaft.

[0009] Furthermore, the opening groove is arranged on the inner side of the pawl control ring.

[0010] Furthermore, it also includes a positioning key arranged in the key cavity on the core shaft, and the inner wall of the pawl seat is provided with a key groove allowing the positioning key to pass through.

[0011] Further, the pawl seat is provided with a boss extending into the interior of the pawl control ring.

[0012] Further, on one side of the pawl seat close to the pawl control ring, there is a radially penetrating relief opening for accommodating the control part of the pawl.

[0013] Further, the pawl control ring includes a first control ring and a second control ring. The first control ring and the second control ring are sleeved on the core shaft and arranged along the length direction of the core shaft. On one side of the first control ring close to the second control ring, there is a toggle lever, and the second control ring is provided with a lever slot allowing the toggle lever to be inserted.

[0014] Further, the inner wall of the second control ring is provided with inwardly extending ridges, and the lever slot penetrating along the axial direction is provided on the ridges.

[0015] An internal transmission includes the above-mentioned shifting mechanism.

[0016] The beneficial effects of the present utility model are as follows:

[0017] In the present utility model, by sleeving a pawl seat on the core shaft, the pawl control ring is provided with an opening groove for controlling the opening or retraction of the pawl, the pawl seat is provided with a pawl groove for accommodating the pawl, the pawl seat is installed at the end of the pawl control ring, and the pawl control ring can rotate relative to the pawl seat around the axis. The independent pawl seat at the end can provide an installation position for the pawl control ring, enabling the pawl control ring not only to control the pawl but also to support the smallest sun gear. The sun gear does not need to wrap the pawl, the pawl seat, and the pawl control ring at the same radial position simultaneously. As a result, the sun gear can have a smaller size, the corresponding planetary gear can have a larger space, the number of gear shift levels can have a larger range, the radial space of the entire internal transmission can become smaller, meeting the requirements of more miniaturized and multi-stage speed change. The core shaft does not need to reduce the shaft diameter, and the strength and safety are still guaranteed. Description of the Drawings

[0018] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a perspective view of the internal transmission of the present utility model.

[0020] Figure 2 It is a cross-sectional view of the internal transmission of the present utility model.

[0021] Figure 3Schematic diagram of the combined structure of the pawl control ring, pawl seat, pawl, and mandrel of the present utility model.

[0022] Figure 4 Exploded view of the pawl control ring, pawl seat, pawl, and mandrel of the present utility model.

[0023] Figure 5 Schematic diagram of the combined structure of the second control ring, pawl seat, and pawl of the present utility model.

[0024] Figure 6 Exploded view of the second control ring, pawl seat, and pawl of the present utility model.

[0025] Figure 7 Schematic diagram of the combined structure of the second control ring, pawl seat, and pawl of the present utility model from another perspective.

[0026] Figure 8 Exploded view of the second control ring, pawl seat, and pawl of the present utility model from another perspective.

[0027] Wherein:

[0028] 1 - Pawl control ring, 10 - Open slot, 11 - First control ring, 12 - Second control ring, 13 - Lever, 14 - Rod slot, 15 - Rib, 100 - Mandrel;

[0029] 2 - Pawl seat, 20 - Pawl slot, 21 - Keyway, 22 - Boss, 23 - Relief opening, 200 - Pawl, 210 - Locking portion, 220 - Control portion;

[0030] 3 - Locating key;

[0031] 400 - Shift component, 410 - Sun gear, 420 - Planet gear, 430 - Input member, 440 - Planet carrier, 450 - Clutch, 460 - Ring gear, 470 - Output member. Detailed implementation manners

[0032] In order to make the technical means, creative features, achieved purposes, and functions of the present utility model easy to understand, the present utility model will be further described below with reference to specific illustrations.

[0033] See Figures 1 to 8A shift mechanism includes a pawl control ring 1 and a pawl seat 2 sleeved on a core shaft 100, the pawl control ring 1 is provided with an opening groove 10 for controlling the opening or retraction of the pawl 200, the pawl seat 2 is provided with a pawl groove 20 for accommodating the pawl 200, the pawl seat 2 is installed at the end of the pawl control ring 1, and the pawl control ring 1 can rotate around the axis relative to the pawl seat 2. The independent pawl seat 2 at the end can provide an installation position for the pawl control ring 1, so that the pawl control ring 1 can not only control the pawl 200, but also support the smallest sun gear 410. The sun gear 410 does not need to wrap the pawl 200, the pawl seat 2 and the pawl control ring 1 at the same radial position at the same time, so that the sun gear 410 can obtain a smaller size, the corresponding planetary gear 420 obtains a larger space, the gear shift level can obtain a larger range, and the radial space of the entire internal transmission can become smaller to meet the needs of smaller and more multi-level speed changes. The core shaft 100 does not need to reduce the shaft diameter, and the strength and safety are still guaranteed.

[0034] Specifically, when in use, the shift assembly 400 is operated to drive the pawl control ring 1 to control the opening and closing of the pawl 200 on the spindle 100. When the pawl 200 is retracted, the sun gear 410 and the planetary gear 420 rotate freely, and the pawl control ring 1 also supports the sun gear 410. When the input member 430 inputs torque, it first passes through the planetary carrier 440, and the speed of the planetary carrier 440 is higher than the speed of the inner ring 460. Then the clutch 450 is engaged to synchronize the speeds of the planetary carrier 420 and the inner ring 460. The torque of the planetary carrier 440 is transmitted to the inner ring 460, and the inner ring 460 outputs it to the wheels through the output member 470. At this time, the internal transmission does not change speed through the planetary gear mechanism.

[0035] When the pawl control ring 1 controls the pawl 200 to open, the sun gear 410 is locked, and the pawl control ring 1 also supports the sun gear 410. When the input member 430 inputs torque, it first passes through the planet carrier 440, and the planet carrier 440 rotates to drive the planet gear 420 to rotate. The sun gear 410 meshes with the planet gear 420, so that the speed of the inner ring gear 460 is higher than the speed of the planet carrier 440. At this time, the clutch 450 is disengaged, so that the torque of the inner ring gear 460 is output to the wheels through the output member 470. At this time, the internal transmission changes speed through the planetary gear mechanism.

[0036] The pawl groove 20 includes a locking section for accommodating the locking portion 210 of the pawl 200, and the position of the locking section is staggered with the position of the outer teeth of the sun gear. This can further ensure that the position of the outer teeth of the sun gear 410 does not need to vacate space to wrap the pawl 200, and only other positions of the sun gear 410 need to be wrapped, so that the sun gear 410 can obtain a smaller radial size.

[0037] It further includes a mandrel 100, and the pawl control ring 1 and the pawl seat 2 are respectively sleeved on the mandrel 100.

[0038] The opening groove 10 is arranged inside the pawl control ring 1. This can make the outer surface of the pawl control ring 1 smooth, facilitating the support of the sun gear 410.

[0039] It further includes a positioning key 3 arranged in the key cavity of the mandrel 100, and a key groove 21 allowing the positioning key 3 to pass through is arranged on the inner wall of the pawl seat 2. This can prevent the radial rotation of the pawl seat 2, making the installation of the pawl 200 stable.

[0040] The pawl seat 2 is provided with a boss 22 extending into the inside of the pawl control ring 1. The boss 22 can improve the concentricity of the pawl seat 2 and the pawl control ring 1, making the rotation more stable, and restricting the rotation angle of the pawl control ring 1 to avoid unnecessary control caused by excessive rotation.

[0041] On one side of the pawl seat 2 close to the pawl control ring 1, there is a radially penetrating relief opening 23 for accommodating the control part 220 of the pawl 200. This can make the pawl seat 2 closer to the components, improve the integration, and facilitate miniaturization.

[0042] The pawl control ring 1 includes a first control ring 11 and a second control ring 12. The first control ring 11 and the second control ring 12 are sleeved on the mandrel 100 and arranged along the length direction of the mandrel 100. On one side of the first control ring 11 close to the second control ring 12, there is a lever 13, and the second control ring 12 is provided with a rod groove 14 allowing the lever 13 to be inserted. This can enable the second control ring 12 for controlling the smallest sun gear 410 to be manufactured and installed separately, facilitating production and installation.

[0043] On the inner wall of the second control ring 12, there are inwardly extending ridges 15, and the rod groove 14 penetrating along the axial direction is arranged on the ridges 15. The ridges 15 can cooperate with the boss 22 to limit the rotation amplitude, and at the same time, the rod groove 14 can be formed.

[0044] An internal transmission includes the above shifting mechanism.

[0045] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A shift mechanism, characterized in that: The invention comprises a pawl control ring (1) and a pawl seat (2) sleeved on a core shaft (100); the pawl control ring (1) is provided with an opening groove (10) for controlling the opening or closing of a pawl (200); the pawl seat (2) is provided with a pawl groove (20) for accommodating the pawl (200); the pawl seat (2) is mounted at the end of the pawl control ring (1); and the pawl control ring (1) can rotate around an axis relative to the pawl seat (2).

2. The shift mechanism according to claim 1, wherein: The pawl groove (20) comprises a locking section for accommodating a locking portion (210) of the pawl (200), and the position of the locking section is offset from the position of the external teeth of the sun gear.

3. The shift mechanism according to claim 1, wherein: It also comprises a core shaft (100), and the ratchet control ring (1) and the ratchet seat (2) are respectively sleeved on the core shaft (100).

4. The shift mechanism according to claim 1, characterized in that: The opening groove (10) is arranged on the inner side of the ratchet control ring (1).

5. The shift mechanism according to claim 1, wherein: It also includes a positioning key (3) disposed in a key cavity on the core shaft (100), and an inner wall of the pawl seat (2) is provided with a key slot (21) allowing the positioning key (3) to pass through.

6. The shift mechanism according to claim 1, wherein: The ratchet seat (2) is provided with a boss (22) extending into the interior of the ratchet control ring (1).

7. The shift mechanism according to claim 1, characterized in that: A radially penetrating opening (23) is provided on one side of the ratchet seat (2) close to the ratchet control ring (1), and is used to accommodate a control portion (220) of the ratchet (200).

8. The shift mechanism according to any one of claims 1 to 7, characterized in that: The ratchet control ring (1) comprises a first control ring (11) and a second control ring (12); the first control ring (11) and the second control ring (12) are sleeved on the core shaft (100) and arranged along the length direction of the core shaft (100); a lever (13) is provided on a side of the first control ring (11) close to the second control ring (12); and the second control ring (12) is provided with a lever groove (14) for allowing the lever (13) to be inserted.

9. The shift mechanism according to claim 8, characterized in that: The inner wall of the second control ring (12) is provided with a convex strip (15) extending inwards, and the convex strip (15) is provided with the rod groove (14) penetrating along the axial direction.

10. An internal transmission, characterized in that: A gear shifting mechanism comprising any one of claims 1 to 9.

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