Cam shift mechanism with secondary shift function

Abstract

The utility model discloses a cam gear shifting mechanism with secondary gear engagement function, can normally assist the combination between the corresponding spline on the planet carrier and the tooth cover, when the top tooth appears between the tooth cover and spline, can prevent the tooth cover from appearing the substantial backoff through the form of the force storage structure force storage, when the subsequent tooth cover and spline relatively rotate to the position of being able to continue to combine, the force storage structure can drive the tooth cover to continue to advance, complete gear shifting. In the application, including gear shifting cam and camshaft, the camshaft is sleeved with secondary torsional spring, the camshaft is fixed with the main shaft plate, the secondary torsional spring includes torsional spring body, first spring head piece and second spring head piece, the main shaft plate is equipped with the middle shift knob, the gear shifting cam is equipped with the cam side body, the main shaft plate is equipped with first auxiliary shift knob and second auxiliary shift knob, and first auxiliary shift knob, first spring head piece, middle shift knob, second spring head piece and second auxiliary shift knob are sequentially arranged along the circumference of gear shifting cam.

Description

Technical Field

[0001] This utility model belongs to the technical field of vehicle transmission, transfer case, and high / low speed shifting mechanism, and particularly relates to a cam shifting mechanism with a secondary shifting function. Background Technology

[0002] The transfer case is a gear transmission system. Its input shaft is directly or via a universal joint connected to the second shaft of the transmission, while its output shaft has several shafts, each connected to a drive axle via a universal joint. In conventional vehicle transfer cases, when switching from four-wheel drive low-speed mode to four-wheel drive high-speed mode, or vice versa, the gear sleeve needs to engage with the corresponding splines on the planetary carrier. After the gear sleeve and spline begin to contact, there may be some "tooth contact" between the spline and the gear sleeve. Before the gear sleeve and spline are fully engaged, a continuous thrust will be generated on the contact surface, causing the gear sleeve to tend to retract (the gear sleeve and spline rotate at different speeds). After the gear sleeve and spline are fully engaged, the shift is complete, at which point the gear sleeve and spline rotate at the same speed.

[0003] Existing technology description: The gear sleeve is driven by the shift fork, and the shift fork is driven by the shift cam. The shift cam has multiple "incomplete annular grooves or annular surfaces" (such as...) extending circumferentially along its sidewalls that can mate with the shift fork. Figure 1 As shown in the diagram), adjacent "incomplete annular grooves or annular surfaces" are connected by "spiral grooves or inclined surfaces" arranged spirally in the circumferential direction of the shift cam (as shown in the diagram). Figure 1 As shown in the diagram, each "spiral groove or inclined surface" can also engage with the shift fork. Thus, when the shift cam rotates, the shift fork moves either along the "incomplete annular groove or annular surface" or along the "spiral groove or inclined surface" (the shift fork's own movement direction is parallel to the camshaft axis, so it can drive the gear sleeve to move axially). When the shift fork moves along the "incomplete annular groove or annular surface," it will not move axially along the camshaft, and the gear sleeve will also remain stationary. When the shift fork moves along the "spiral groove or inclined surface," it will move axially along the camshaft, allowing the gear sleeve to move and engage with the corresponding gear. Utility Model Content

[0004] This utility model provides a cam shifting mechanism with a secondary shifting function. Normally, it can assist the gear sleeve in engaging with the corresponding spline on the planetary carrier. When there is a tooth tipping between the gear sleeve and the spline, the gear sleeve can be prevented from retracting significantly by accumulating energy through a power storage structure. When the gear sleeve and the spline rotate to a position where they can continue to engage, the power storage structure can drive the gear sleeve to continue forward and complete the shifting.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A cam shifting mechanism with a secondary gear shifting function includes a shifting cam and a camshaft;

[0007] The camshaft is driven by a servo motor, a shift cam is sleeved on the camshaft, the shift cam is rotatably connected to the camshaft, a secondary torsion spring is sleeved on the camshaft, and a main shaft plate is fixed on the camshaft.

[0008] The secondary torsion spring includes a torsion spring body, a first spring head plate disposed at one end of the torsion spring body, and a second spring head plate disposed at the other end of the torsion spring body. A center shifter is provided on the main shaft plate between the first spring head plate and the second spring head plate, and a cam side body is provided on the shift cam between the first spring head plate and the second spring head plate.

[0009] The main spindle plate is provided with a first auxiliary shifter and a second auxiliary shifter. The first auxiliary shifter, the first spring head, the middle shifter, the second spring head, and the second auxiliary shifter are arranged in sequence along the circumference of the shift cam. The first auxiliary shifter, the first spring head, the cam side body, the second spring head, and the second auxiliary shifter are arranged in sequence along the circumference of the shift cam.

[0010] Preferably, the center dial contacts the first spring tip, the center dial contacts the second spring tip, the cam side body contacts the first spring tip, and the cam side body contacts the second spring tip.

[0011] Preferably, the distance between the farthest point on the cam side body from the camshaft axis and the camshaft axis is M, and the distance between the center shifter and the camshaft axis is N, where N > M.

[0012] Preferably, the first auxiliary dial has a first side surface adjacent to the first spring tip, and the first auxiliary dial has a first auxiliary groove opening on the first side surface. The first auxiliary groove has a first stop post slidably connected to the first auxiliary groove, and a first auxiliary spring connected to the first stop post is provided in the first auxiliary groove. The second auxiliary dial has a second side surface adjacent to the second spring tip, and the second auxiliary dial has a second auxiliary groove opening on the second side surface. The second auxiliary groove has a second stop post slidably connected to the second auxiliary groove, and a second auxiliary spring connected to the second stop post is provided in the second auxiliary groove.

[0013] Preferably, one end of the first auxiliary spring is connected to the first stop post, and the other end of the first auxiliary spring is connected to the first auxiliary dial. When the first auxiliary spring is in its natural state, the length of the first stop post outside the first auxiliary groove is L. When the first side contacts the first spring head, the length of the first stop post outside the first auxiliary groove is less than 0.5L. One end of the second auxiliary spring is connected to the second stop post, and the other end of the second auxiliary spring is connected to the second auxiliary dial. When the second auxiliary spring is in its natural state, the length of the second stop post outside the second auxiliary groove is L. When the second side contacts the second spring head, the length of the second stop post outside the second auxiliary groove is less than 0.5L.

[0014] The beneficial effects of this utility model are: under normal circumstances, it can assist the gear sleeve in engaging with the corresponding spline on the planetary carrier. When there is a tooth collision between the gear sleeve and the spline, the energy storage structure can prevent the gear sleeve from retracting significantly. When the gear sleeve and spline rotate to a position where they can continue to engage, the energy storage structure can drive the gear sleeve to continue moving forward and complete the gear shift. It has structures such as a stop post and an auxiliary spring that can assist in energy storage and pushing, which can help the spring head to push the cam side body to rotate more quickly and with greater force, ensuring that the shift fork moves quickly and that the gear sleeve and the corresponding spline engage quickly. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a partial structural schematic diagram of the present invention;

[0017] Figure 3 This is a schematic diagram of the main shaft plate of this utility model from one perspective;

[0018] Figure 4 This is a structural schematic diagram of the main shaft plate of this utility model from another perspective;

[0019] Figure 5 This is a schematic diagram of the structure of the second auxiliary dial contacting the second spring head of this utility model.

[0020] Reference numerals: 1. Shift cam; 101. Servo motor; 102. Cam side body; 2. Camshaft; 3. Secondary torsion spring; 301. Torsion spring body; 302. First spring head; 303. Second spring head; 4. Main shaft plate; 401. Center shifter; 402. First auxiliary shifter; 402a. First auxiliary groove; 402b. Second auxiliary shifter; 403. Second auxiliary shifter; 403a. Second auxiliary groove; 403b. First contact post; 501. First auxiliary spring; 502. Second contact post; 601. Second auxiliary spring; 602. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown,

[0023] A cam shifting mechanism with a secondary gear shifting function includes a shifting cam 1 and a camshaft 2;

[0024] The camshaft 2 is driven by the servo motor 101. The shift cam 1 is sleeved on the camshaft 2 and is rotatably connected to the camshaft 2. A secondary torsion spring 3 is sleeved on the camshaft 2 and a main shaft plate 4 is fixed on the camshaft 2.

[0025] The secondary torsion spring 3 includes a torsion spring body 301, a first spring head 302 disposed at one end of the torsion spring body 301, and a second spring head 303 disposed at the other end of the torsion spring body 301. The main shaft plate 4 is provided with a center shift head 401 located between the first spring head 302 and the second spring head 303. The shift cam 1 is provided with a cam side body 102 located between the first spring head 302 and the second spring head 303.

[0026] The main shaft plate 4 is provided with a first auxiliary dial 402 and a second auxiliary dial 403. The first auxiliary dial 402, the first spring head 302, the middle dial 401, the second spring head 303 and the second auxiliary dial 403 are arranged in sequence along the circumference of the shift cam 1. The first auxiliary dial 402, the first spring head 302, the cam side body 102, the second spring head 303 and the second auxiliary dial 403 are arranged in sequence along the circumference of the shift cam 1.

[0027] As mentioned in the background section, when the gear sleeve engages with the corresponding spline on the planetary carrier, a "tooth knocking" situation may occur. This may prevent the gear sleeve from continuing to advance and fully engage with the spline. Furthermore, the gear sleeve and spline rotate at different speeds before complete engagement; if they cannot fully engage, tooth knocking is more likely to occur.

[0028] In this case, taking the switch from four-wheel drive high-speed mode to four-wheel drive low-speed mode as an example, the servo motor 101 drives the camshaft 2 to rotate, the camshaft 2 drives the main shaft plate 4 to rotate, and the center shifter 401 on the main shaft plate 4 drives the first spring head 302 of the secondary torsion spring 3 to rotate along the axis of the camshaft 2 (equivalent to driving the secondary torsion spring 3 to rotate). The following are two cases:

[0029] In the first case, if the toothed sleeve and the corresponding spline do not "align", the main spindle plate 4 will continue to rotate into place, and the second spring head 303 of the secondary torsion spring 3 will drive the shift cam 1 to rotate through the cam side body 102, thereby driving the shift fork to move into place and completing the shift.

[0030] In the second scenario, initially, the position of some structures is as follows: Figure 2 As shown in the diagram, with the simultaneous rotation of the camshaft 2 and the main shaft plate 4, some parts of the structure achieve the following: Figure 3At the position shown, if a "tooth" appears between the gear sleeve and the corresponding spline, the main spindle plate 4 will continue to rotate into position. However, due to the "tooth," the shift cam 1 and the shift fork will pause their movement. The second spring head 303 of the secondary torsion spring 3 will temporarily be unable to push the cam side body 102. At this time, the secondary torsion spring 3 begins to store force (at a certain moment, reaching the position shown). Figure 4 (as shown in the image) Then, when the gear sleeve rotates relative to the corresponding spline to a position where they can smoothly engage, under the action of the already charged secondary torsion spring 3, the second spring head 303 pushes the cam side body 102 (shifting cam 1) to rotate, so that the gear sleeve and the corresponding spline are engaged in place.

[0031] It is important to emphasize that "gear engagement" can occur in two ways: one is when the gear sleeve begins to engage with the spline but is not yet fully engaged; the other is when the gear sleeve is pressing against the spline but has not yet begun to engage. In the latter case, if the secondary torsion spring 3 has not yet released its stored force when the main spindle plate 4 continues to rotate to its final position, then the second spring head 303 will already be contacted and pressed by the second auxiliary lever 403 (e.g., ...). Figure 5 As shown in the diagram, the second spring head 303 is subjected to the force from the torsion spring body 301 and the thrust from the second auxiliary shift head 403. Thus, when the second spring head 303 can rotate, it can push the cam side body 102 (shift cam 1) to rotate more quickly and with greater force, ensuring that the shift fork moves quickly and that the gear sleeve and the corresponding spline can quickly complete the engagement (the gear sleeve and the corresponding spline rotate at different speeds before they are fully engaged, so if they cannot engage quickly, it may cause a large misalignment between the gear sleeve and the spline before the engagement is completed, impacting the gear sleeve and causing it to retract, thus affecting the smooth completion of the engagement process).

[0032] When switching from four-wheel drive low speed mode to four-wheel drive high speed mode, the principle is the same as above, the difference is that the shift cam 1 rotates in the opposite direction, the middle shifter 401 drives the second spring head 303 of the secondary torsion spring 3, and the first spring head 302 is used to push the cam side body 102. When the "tooth" is engaged, the first spring head 302 may be subjected to the thrust from the first auxiliary shifter 402.

[0033] The center dial 401 contacts the first spring head 302, the center dial 401 contacts the second spring head 303, the cam side body 102 contacts the first spring head 302, and the cam side body 102 contacts the second spring head 303.

[0034] As soon as the center dial 401 rotates, it can instantly push the first spring 302 or the second spring 303. The first spring 302 or the second spring 303 can also instantly provide thrust to the cam side body 102, resulting in higher efficiency, less impact, and better stability during operation.

[0035] The distance between the farthest point on the cam side body 102 from the axis of the camshaft 2 and the axis of the camshaft 2 is M, and the distance between the center dial 401 and the axis of the camshaft 2 is N, where N > M.

[0036] The cam side body 102 and the center dial 401 form an "inner and outer arrangement" that does not interfere with each other and makes better use of the surface space of the main spindle plate 4 without occupying the radial space outside the surface of the main spindle plate 4.

[0037] The first auxiliary dial 402 has a first side surface adjacent to the first spring tip 302. The first auxiliary dial 402 is provided with a first auxiliary groove 402b opening on the first side surface. The first auxiliary groove 402b is provided with a first stop post 501 slidably connected to the first auxiliary groove 402b. A first auxiliary spring 502 connected to the first stop post 501 is provided in the first auxiliary groove 402b. The second auxiliary dial 403 has a second side surface adjacent to the second spring tip 303. The second auxiliary dial 403 is provided with a second auxiliary groove 403b opening on the second side surface. The second auxiliary groove 403b is provided with a second stop post 601 slidably connected to the second auxiliary groove 403b. A second auxiliary spring 602 connected to the second stop post 601 is provided in the second auxiliary groove 403b.

[0038] In this design, when switching from four-wheel drive high-speed mode to four-wheel drive low-speed mode, if a "tooth collision" occurs between the gear sleeve and the corresponding spline, and the main shaft plate 4 continues to rotate to its final position, if the secondary torsion spring 3 has not yet released its stored force, then the second spring head 303 is already tightly pressed against the second stop post 601, and the second auxiliary spring 602 is compressed and stored. This storage method can obviously store a relatively larger force, so the second spring head 303 is subjected to the force from the torsion spring body 301, as well as the thrust from the second stop post 601. Subsequently, when the second spring head 303 can rotate, it can push the cam side body 102 (shift cam 1) to rotate more quickly and with greater force, ensuring that the shift fork moves quickly and the gear sleeve and the corresponding spline quickly engage.

[0039] In this design, when switching from four-wheel drive low-speed mode to four-wheel drive high-speed mode, if a "tooth collision" occurs between the gear sleeve and the corresponding spline, and the main shaft plate 4 continues to rotate to its position, if the secondary torsion spring 3 has not yet released its stored force, then the first spring head 302 is already tightly pressed against the first stop post 501, and the first auxiliary spring 502 is compressed and stored. This storage method can obviously store a relatively larger force, so the first spring head 302 is subjected to the force from the torsion spring body 301, as well as the thrust from the first stop post 501. Subsequently, when the first spring head 302 can rotate, it can push the cam side body 102 (shift cam 1) to rotate more quickly and with greater force, ensuring that the shift fork moves quickly and the gear sleeve and the corresponding gear quickly engage.

[0040] One end of the first auxiliary spring 502 is connected to the first stop post 501, and the other end of the first auxiliary spring 502 is connected to the first auxiliary dial 402. When the first auxiliary spring 502 is in its natural state, the length of the first stop post 501 outside the first auxiliary groove 402b is L. When the first side contacts the first spring head 302, the length of the first stop post 501 outside the first auxiliary groove 402b is less than 0.5L. One end of the second auxiliary spring 602 is connected to the second stop post 601, and the other end of the second auxiliary spring 602 is connected to the second auxiliary dial 403. When the second auxiliary spring 602 is in its natural state, the length of the second stop post 601 outside the second auxiliary groove 403b is L. When the second side contacts the second spring head 303, the length of the second stop post 601 outside the second auxiliary groove 403b is less than 0.5L.

[0041] When the first side contacts the first spring head 302, the first contact post 501 naturally presses against the first spring head, and the first auxiliary spring 502 is compressed and stores force. When the second side contacts the second spring head 303, the second contact post 601 naturally presses against the second spring head, and the second auxiliary spring 602 is compressed and stores force.

[0042] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A cam shifting mechanism with a secondary shifting function, comprising a shifting cam and a camshaft; Its characteristics are, The camshaft is driven by a servo motor, a shift cam is sleeved on the camshaft, the shift cam is rotatably connected to the camshaft, a secondary torsion spring is sleeved on the camshaft, and a main shaft plate is fixed on the camshaft. The secondary torsion spring includes a torsion spring body, a first spring head plate disposed at one end of the torsion spring body, and a second spring head plate disposed at the other end of the torsion spring body. A center shifter is provided on the main shaft plate between the first spring head plate and the second spring head plate, and a cam side body is provided on the shift cam between the first spring head plate and the second spring head plate. The main spindle plate is provided with a first auxiliary shifter and a second auxiliary shifter. The first auxiliary shifter, the first spring head, the middle shifter, the second spring head, and the second auxiliary shifter are arranged in sequence along the circumference of the shift cam. The first auxiliary shifter, the first spring head, the cam side body, the second spring head, and the second auxiliary shifter are arranged in sequence along the circumference of the shift cam.

2. The cam shifting mechanism with secondary gear shifting function according to claim 1, characterized in that, The center dial contacts the first spring tip, the center dial contacts the second spring tip, the cam side body contacts the first spring tip, and the cam side body contacts the second spring tip.

3. The cam shifting mechanism with secondary gear shifting function according to claim 1, characterized in that, The distance between the farthest point on the cam side body from the camshaft axis and the camshaft axis is M, and the distance between the center shifter and the camshaft axis is N, where N > M.

4. A cam shifting mechanism with secondary gear shifting function according to claim 1, 2, or 3, characterized in that, The first auxiliary dial has a first side surface adjacent to the first spring head, and the first auxiliary dial has a first auxiliary groove opening on the first side surface. The first auxiliary groove has a first stop post slidably connected to the first auxiliary groove, and a first auxiliary spring connected to the first stop post is provided in the first auxiliary groove. The second auxiliary dial has a second side surface adjacent to the second spring head, and the second auxiliary dial has a second auxiliary groove opening on the second side surface. The second auxiliary groove has a second stop post slidably connected to the second auxiliary groove, and a second auxiliary spring connected to the second stop post is provided in the second auxiliary groove.

5. A cam shifting mechanism with secondary gear shifting function according to claim 4, characterized in that, One end of the first auxiliary spring is connected to the first stop post, and the other end of the first auxiliary spring is connected to the first auxiliary dial. When the first auxiliary spring is in its natural state, the length of the first stop post outside the first auxiliary groove is L. When the first side contacts the first spring head, the length of the first stop post outside the first auxiliary groove is less than 0.5L. One end of the second auxiliary spring is connected to the second stop post, and the other end of the second auxiliary spring is connected to the second auxiliary dial. When the second auxiliary spring is in its natural state, the length of the second stop post outside the second auxiliary groove is L. When the second side contacts the second spring head, the length of the second stop post outside the second auxiliary groove is less than 0.5L.

Images