Tracked vehicle and steering control mechanism thereof

Abstract

The utility model discloses a tracked vehicle and a steering control mechanism thereof, a transmission shaft, a left steering gear and a right steering gear are all rotatably installed on a box body, an intermediate gear is fixed on the transmission shaft, a left connecting sleeve and a right connecting sleeve are sleeved on the transmission shaft, and the left connecting sleeve and the right connecting sleeve are respectively arranged on two sides of the intermediate gear. The transmission shaft and the left connecting sleeve can be connected through a left jaw clutch, and the box body and the left connecting sleeve are connected through a left brake clutch; the transmission shaft and the right connecting sleeve can be connected through a right jaw clutch, and the box body and the right connecting sleeve are connected through a right brake clutch; a left piston and a right piston are further installed in the box body in a sliding mode. When the left piston slides, the left jaw clutch can be driven to be separated and the left brake clutch can be combined; when the right piston slides, the right jaw clutch can be driven to be separated and the right brake clutch can be combined. The steering mechanism is simpler, more novel and more compact in structure, low in manufacturing cost and convenient to install, maintain and use.

Description

Technical Field

[0001] The utility model relates to the field of vehicle steering mechanisms, in particular to a tracked vehicle and a steering control mechanism thereof. Background Art

[0002] Compared with wheeled vehicles, tracked vehicles have the advantages of strong off-road performance, large load capacity, and ability to adapt to harsh working environments. Therefore, they have been widely used in military, industrial, agricultural and other fields.

[0003] Tracked vehicles achieve steering by changing the driving force of the tracks on both sides. The performance of the steering mechanism directly affects the performance of the tracked vehicle. Currently, most tracked vehicles achieve steering by braking on one side. Traditional mechanical steering has a large instantaneous impact, cannot obtain an accurate and reasonable turning radius, and has poor control comfort. Utility Model Content

[0004] In order to solve the problem of poor turning radius in the prior art, the utility model aims to provide a tracked vehicle and a steering control mechanism thereof, wherein the structure of the control mechanism is simpler and the steering effect is cleaner and more accurate.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a steering control mechanism, including a housing, a transmission shaft, a left connecting sleeve, a left steering gear, a right connecting sleeve, a right steering gear, an intermediate gear, a left tooth clutch, a left brake clutch, a right tooth clutch and a right brake clutch; the transmission shaft, the left steering gear and the right steering gear are all rotatably mounted on the housing, the intermediate gear is fixed on the transmission shaft, the transmission shaft is sleeved with a left connecting sleeve and a right connecting sleeve, the left connecting sleeve and the right connecting sleeve are respectively arranged on both sides of the intermediate gear, the left connecting sleeve is sleeved and fixed with the left steering gear, the right connecting sleeve is sleeved and fixed with the right steering gear, the left steering gear is meshed with the left steering gear for transmission, and the right steering gear is meshed with the right steering gear for transmission;

[0006] The transmission shaft and the left connecting sleeve can be connected through the left tooth clutch, and the housing and the left steering gear are connected through the left brake clutch; the transmission shaft and the right connecting sleeve can be connected through the right tooth clutch, and the housing and the right steering gear are connected through the right brake clutch; a left piston and a right piston are also slidably installed in the housing; when the left piston slides, it can drive the left tooth clutch to disengage and the left brake clutch to engage; when the right piston slides, it can drive the right tooth clutch to disengage and the right brake clutch to engage.

[0007] Preferably, the left spline clutch comprises a left spline driving gear, a left spline driven gear and a left spring. The left spline driving gear is mounted on the transmission shaft. The left spline driven gear is spline-connected and slidingly fitted with the left connecting sleeve. The left piston is connected to the left spline driven gear through a bearing. The left spring sleeve is mounted on the left connecting sleeve to drive the helical teeth of the left spline driving gear to mesh with the helical teeth of the left spline driven gear.

[0008] Preferably, the left brake clutch includes a plurality of left inner friction plates and left outer friction plates arranged alternately, both the left inner friction plate and the left outer friction plate are sleeved on the left steering gear, the left inner friction plate is splined to the left steering gear, and the left outer friction plate is splined to the box body; the left splined passive gear is located between the left piston and the friction plate, and after the left piston drives the left splined passive gear to separate from the left splined active gear, the left splined passive gear can be against the friction plate to combine the left inner friction plate and the left outer friction plate.

[0009] Preferably, the box body includes a fixedly connected left box body, a left box cover and a left end cover, one end of the transmission shaft is rotatably matched with the left end cover, and the left piston, the left box cover and the left end cover enclose a left oil chamber for driving the left piston.

[0010] Preferably, the left brake clutch is located between the left case cover and the intermediate gear, and the left tooth clutch is located on the inner side of the left case cover; a left oil inlet channel connected to the left oil chamber is opened on the left end cover, and a left oil outlet channel connected to the left oil chamber is opened on the left case cover.

[0011] Preferably, the right spline clutch comprises a right spline driving gear, a right spline driven gear and a right spring, the right spline driving gear is mounted on the transmission shaft, the right spline driven gear is spline-connected and slidingly fitted with the right connecting sleeve, and the right piston is connected to the right spline driven gear through a bearing; the right spring sleeve is arranged on the right connecting sleeve, and the right spring is used to drive the helical teeth of the right spline driving gear and the helical teeth of the right spline driven gear to engage.

[0012] Preferably, the right brake clutch includes a plurality of right inner friction plates and right outer friction plates alternately arranged, both the right inner friction plate and the right outer friction plate are sleeved on the right steering gear, the right inner friction plate is splined to the right steering gear, and the right outer friction plate is splined to the box body; the right splined passive gear is located between the right piston and the friction plate, and after the right piston drives the right splined passive gear to separate from the right splined active gear, the right splined passive gear can be against the friction plate to combine the right inner friction plate and the right outer friction plate.

[0013] Preferably, the box body includes a fixedly connected right box body, a right box cover and a right end cover, one end of the transmission shaft is rotatably matched with the right end cover, and the right piston, the right box cover and the right end cover enclose a right oil chamber for driving the right piston.

[0014] Preferably, the right brake clutch is located between the right case cover and the intermediate gear, and the right tooth clutch is located on the inner side of the right case cover; a right oil inlet channel connected to the right oil chamber is opened on the right end cover, and a right oil outlet channel connected to the right oil chamber is opened on the right case cover.

[0015] A tracked vehicle comprises the above-mentioned steering control mechanism.

[0016] The beneficial effects of the technical solution of the utility model are as follows: the steering gear is loosely sleeved on the transmission shaft through a connecting sleeve, and the tooth clutch and the brake clutch are controlled by a piston to work alternately to complete the transmission between the transmission shaft and the transmission gear, and the braking between the transmission gear and the housing, so that the power connection between the transmission gear and the transmission shaft can be completely shielded during the steering process, and the steering mechanism structure is simpler, novel, and compact, with low manufacturing cost, easy installation, maintenance and use, and can be applied to a variety of complex and changeable working environments, with good fuel economy, and can also be used for steering mechanisms of tracked vehicles produced and processed in large quantities. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the steering control mechanism.

[0018] Reference numerals: 11, left end cover; 12, left box cover; 13, left box body; 14, right box body; 15, right box cover; 16, right end cover;

[0019] 2. Transmission shaft; 21. Left connecting sleeve; 22. Left steering gear; 23. Right connecting sleeve; 24. Right steering gear; 25. Left output gear; 26. Right output gear; 27. Intermediate gear;

[0020] 3. Left tooth clutch; 31. Left tooth driving gear; 32. Left tooth driven gear; 33. Left spring;

[0021] 4. Left brake clutch; 41. Left baffle; 42. Left inner friction plate; 43. Left outer friction plate; 44. Left butterfly spring; 45. Left pressure plate;

[0022] 5. Left piston; 51. Left oil chamber; 52. Left oil inlet channel; 53. Left oil outlet channel;

[0023] 6. Right tooth clutch; 61. Right tooth driving gear; 62. Right tooth driven gear; 63. Right spring;

[0024] 7. Right brake clutch; 71. Right baffle; 72. Right inner friction plate; 73. Right outer friction plate; 74. Right butterfly spring; 75. Right pressure plate 7;

[0025] 8. Right piston; 81. Right oil chamber; 82. Right oil inlet channel; 83. Right oil outlet channel. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. Example

[0031] like Figure 1 The steering control mechanism shown includes a housing, a transmission shaft 2, an intermediate gear 27, a left connecting sleeve 21, a right connecting sleeve 23, a left steering gear 22, a right steering gear 24, a left tooth clutch 3, a right tooth clutch 6, a left brake clutch 4 and a right brake clutch 7; the transmission shaft 2, the left steering gear 22 and the right steering gear 24 are all rotatably mounted on the housing, the intermediate gear 27 is fixed on the transmission shaft 2, the transmission shaft 2 is sleeved with a left connecting sleeve 21 and a right connecting sleeve 23, the left connecting sleeve 21 and the right connecting sleeve 23 are respectively arranged on both sides of the intermediate gear 27, the left steering gear 22 is sleeved and fixed on the left connecting sleeve 21, and the right steering gear 22 is sleeved and fixed on the right connecting sleeve 23 24, the left steering gear 22 meshes with the left steering gear 22 for transmission, and the right steering gear 24 meshes with the right steering gear 24 for transmission; the transmission shaft 2 and the left connecting sleeve 21 can be connected through the left tooth clutch 3, and the housing and the left steering gear 22 are connected through the left brake clutch 4; the transmission shaft 2 and the right connecting sleeve 23 can be connected through the right tooth clutch 6, and the housing and the right steering gear 24 are connected through the right brake clutch 7; a left piston 5 and a right piston 8 are also slidably installed in the housing; when the left piston 5 slides, it can drive the left tooth clutch 3 to disengage and the left brake clutch 4 to engage; when the right piston 8 slides, it can drive the right tooth clutch 6 to disengage and the right brake clutch 7 to engage.

[0032] With such arrangement, the steering gear is loosely sleeved on the transmission shaft 2 through the connecting sleeve, and the tooth clutch and the brake clutch are controlled by the piston to work alternately to complete the transmission between the transmission shaft 2 and the transmission gear, and the braking between the transmission gear and the housing. In this way, the power connection between the transmission gear and the transmission shaft 2 can be completely shielded during the steering process, and the above-mentioned steering mechanism has a simpler structure and is more convenient to maintain and operate.

[0033] In this embodiment, the left tooth clutch 3 includes a left tooth driving gear 31, a left tooth passive gear 32 and a left spring 33. The left tooth driving gear 31 is installed on the transmission shaft 2, the left tooth passive gear 32 is spline-connected and slidingly matched with the left connecting sleeve 21, and the left piston 5 is connected to the left tooth passive gear 32 through a bearing; the left spring 33 is sleeved on the left connecting sleeve 21, and is used to drive the helical teeth of the left tooth driving gear 31 and the helical teeth of the left tooth passive gear 32 to engage. The left brake clutch 4 includes a plurality of left inner friction plates 42 and left inner friction plates 43 which are alternately arranged. The left inner friction plates 42 and left inner friction plates 43 are both sleeved on the left steering gear 22. The left inner friction plates 42 are spline-connected to the left steering gear 22, and the left inner friction plates 43 are spline-connected to the housing. The left spline driven gear 32 is located between the left piston 5 and the friction plate. After the left piston 5 drives the left spline driven gear 32 to separate from the left spline driving gear 31, the left spline driven gear 32 can abut against the friction plate, so that the left inner friction plates 42 and the left inner friction plates 43 are combined.

[0034] The right tooth clutch 6 comprises a right tooth active gear, a right tooth passive gear and a right spring. The right tooth active gear is mounted on the transmission shaft 2. The right tooth passive gear is spline-connected and slidingly matched with the right connecting sleeve 23. The right piston 8 is connected to the right tooth passive gear through a bearing. The right spring is sleeved on the right connecting sleeve 23. The right spring is used to drive the helical teeth of the right tooth active gear to mesh with the helical teeth of the right tooth passive gear. The right brake clutch 7 comprises a plurality of right inner friction plates 72 and right outer friction plates 73 arranged alternately. The right inner friction plates 72 and the right outer friction plates 73 are both sleeved on the right steering gear 24. The right inner friction plates 72 are spline-connected with the right steering gear 24, and the right outer friction plates 73 are spline-connected with the housing. The right tooth passive gear is located between the right piston 8 and the friction plate. After the right piston 8 drives the right tooth passive gear to separate from the right tooth active gear, the right tooth passive gear can abut against the friction plate, so that the right inner friction plate 72 and the right outer friction plate 73 are combined.

[0035] With such arrangement, the two pressure gears can better transmit power and torque through the helical teeth, and the structures of the tooth clutch and the brake clutch are simpler, the cost is lower, and the maintenance is more convenient.

[0036] Further preferably, one end of the left splined passive gear 32 is protruded with helical teeth, and the other end of the left splined passive gear 32 is protruded with a left abutment portion and a left reset portion, the left abutment portion is used to drive the left abutment portion of the left brake clutch 4, and the left reset portion extends into the inner side of the left steering gear 22 and abuts against the left spring 33. One end of the right splined passive gear is protruded with helical teeth, and the other end of the right splined passive gear is protruded with a right abutment portion and a right reset portion, the right abutment portion is used to drive the right abutment portion of the right brake clutch 7, and the right reset portion extends into the inner side of the right steering gear 24 and abuts against the right spring.

[0037] Further preferably, the left brake clutch 4 also includes a left pressure plate 45 and a left baffle 41. The left baffle 41 is fixed on the housing, and the left pressure plate 45 is slidably installed on the housing. The inner friction plate and the outer friction plate of the left brake clutch 4 are located between the left baffle 41 and the left pressure plate 45. The left pressure plate 45 is located between the left piston 5 and the friction plate. A left butterfly spring 44 is arranged between the inner friction plate and the outer friction plate. The butterfly spring is used to drive the left pressure plate 45, the inner friction plate, the outer friction plate and the left baffle 41 to separate from each other.

[0038] The right brake clutch 7 also includes a right pressure plate 75 and a right baffle 71. The right baffle 71 is fixed on the box body, and the right pressure plate 75 is slidably installed on the box body. The inner friction plate and the outer friction plate of the right brake clutch 7 are located between the right baffle 71 and the right pressure plate 75. The right pressure plate 75 is located between the right piston 8 and the friction plate. A right butterfly spring 74 is arranged between the inner friction plate and the outer friction plate. The butterfly spring is used to drive the right pressure plate 75, the inner friction plate, the outer friction plate and the right baffle 71 to separate from each other.

[0039] In this embodiment, the housing includes a left end cover 11, a left housing cover 12, a left housing 13, a right housing 14, a right housing cover 15 and a right end cover 16 which are fixedly connected in sequence; two sets of brake clutches are respectively arranged in the left housing 13 and the right housing 14, and two sets of tooth clutches are respectively arranged on the inner sides of the left housing cover 12 and the right housing cover 15; one end of the left piston 5 extends between the left end cover 11 and the left housing cover 12, and the left end cover 11 and the left housing cover 12 are both slidably matched with the left piston 5, and the left end cover 11, the left housing cover 12 and the left piston 5 enclose a left oil chamber 51; one end of the right piston 8 extends between the right end cover 16 and the right housing cover 15, and the right end cover 16 and the right housing cover 15 are both slidably matched with the right piston 8, and the right end cover 16, the right housing cover 15 and the right piston 8 enclose a right oil chamber 81, and the right oil inlet channel is arranged on the right end cover 16. Such arrangement makes it easy to install components such as the tooth clutch, the piston, the rotary clutch, the transmission shaft 2 and the steering gear in the box.

[0040] Furthermore, the left end cover 11 is provided with a left oil inlet passage 52 communicating with the left oil chamber 51, and the left box cover 12 is provided with a left oil outlet passage 53 communicating with the left oil chamber 51; the right end cover 16 is provided with a right oil inlet passage 82 communicating with the right oil chamber 81, and the right box cover 15 is provided with a right oil outlet passage 83 communicating with the right oil chamber 81. In this way, the oil chamber and the oil passage are arranged by the box body and the piston structure, which makes the structure of the mechanism simpler, the cost of the mechanism lower, and the maintenance more convenient.

[0041] In this embodiment, a left output gear 25 and a right output gear 26 are rotatably mounted in the housing. The left output gear meshes with the left steering gear for transmission, and the right output gear meshes with the right steering gear for transmission.

[0042] A tracked vehicle comprises the above-mentioned steering control mechanism.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0044] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A steering control mechanism, characterized in that: It comprises a housing, a transmission shaft (2), a left connecting sleeve (21), a left steering gear (22), a right connecting sleeve (23), a right steering gear (24), an intermediate gear (27), a left tooth clutch (3), a left brake clutch (4), a right tooth clutch (6) and a right brake clutch (7); The transmission shaft (2), the left steering gear (22) and the right steering gear (24) are all rotatably mounted on the housing; the intermediate gear (27) is fixed on the transmission shaft (2); a left connecting sleeve (21) and a right connecting sleeve (23) are sleeved on the transmission shaft (2); the left connecting sleeve (21) and the right connecting sleeve (23) are respectively arranged on both sides of the intermediate gear (27); the left steering gear (22) is sleeved and fixed on the left connecting sleeve (21); the right steering gear (24) is sleeved and fixed on the right connecting sleeve (23); the left steering gear (22) meshes with the left steering gear (22) for transmission; and the right steering gear (24) meshes with the right steering gear (24) for transmission; The transmission shaft (2) and the left connecting sleeve (21) can be connected via a left tooth clutch (3), and the housing and the left steering gear (22) are connected via a left brake clutch (4); the transmission shaft (2) and the right connecting sleeve (23) can be connected via a right tooth clutch (6), and the housing and the right steering gear (24) are connected via a right brake clutch (7); A left piston (5) and a right piston (8) are also slidably mounted in the box body; when the left piston (5) slides, it can drive the left tooth clutch (3) to disengage and the left brake clutch (4) to engage; when the right piston (8) slides, it can drive the right tooth clutch (6) to disengage and the right brake clutch (7) to engage.

2. A steering control mechanism according to claim 1, characterized in that: The left tooth clutch (3) comprises a left tooth driving gear (31), a left tooth driven gear (32) and a left spring (33). The left tooth driving gear (31) is mounted on the transmission shaft (2). The left tooth driven gear (32) is spline-connected and slidingly matched with the left connecting sleeve (21). The left piston (5) is connected to the left tooth driven gear (32) via a bearing. The left spring (33) is sleeved on the left connecting sleeve (21) and is used to drive the helical teeth of the left tooth driving gear (31) to mesh with the helical teeth of the left tooth driven gear (32).

3. A steering control mechanism according to claim 2, characterized in that: The left brake clutch (4) comprises a plurality of left inner friction plates (42) and left outer friction plates (43) which are arranged alternately. The left inner friction plates (42) and the left outer friction plates (43) are both sleeved on the left steering gear (22). The left inner friction plates (42) are spline-connected to the left steering gear (22), and the left outer friction plates (43) are spline-connected to the housing. The left spline driven gear (32) is located between the left piston (5) and the friction plates. After the left piston (5) drives the left spline driven gear (32) to separate from the left spline driving gear (31), the left spline driven gear (32) can abut against the friction plates, so that the left inner friction plates (42) and the left outer friction plates (43) are combined.

4. A steering control mechanism according to claim 3, characterized in that: The housing comprises a left housing (13), a left housing cover (12) and a left end cover (11) which are fixedly connected. One end of the transmission shaft (2) is rotatably matched with the left end cover (11). The left piston (5), the left housing cover (12) and the left end cover (11) enclose a left oil chamber (51) for driving the left piston (5).

5. A steering control mechanism according to claim 4, characterized in that: The left brake clutch (4) is located between the left case cover (12) and the intermediate gear (27), and the left tooth clutch (3) is located inside the left case cover (12). The left end cover (11) is provided with a left oil inlet passage (52) communicating with the left oil chamber (51), and the left case cover (12) is provided with a left oil outlet passage (53) communicating with the left oil chamber (51).

6. A steering control mechanism according to claim 1, characterized in that: The right tooth clutch (6) comprises a right tooth driving gear (61), a right tooth driven gear (62) and a right spring (63). The right tooth driving gear (61) is mounted on the transmission shaft (2). The right tooth driven gear (62) is spline-connected and slidingly matched with the right connecting sleeve (23). The right piston (8) is connected to the right tooth driven gear (62) via a bearing. The right spring (63) is sleeved on the right connecting sleeve (23). The right spring (63) is used to drive the helical teeth of the right tooth driving gear (61) to mesh with the helical teeth of the right tooth driven gear (62).

7. A steering control mechanism according to claim 6, characterized in that: The right brake clutch (7) comprises a plurality of right inner friction plates (72) and right outer friction plates (73) which are arranged alternately. The right inner friction plates (72) and the right outer friction plates (73) are both sleeved on the right steering gear (24). The right inner friction plates (72) are spline-connected to the right steering gear (24), and the right outer friction plates (73) are spline-connected to the housing. The right spline driven gear (62) is located between the right piston (8) and the friction plates. After the right piston (8) drives the right spline driven gear (62) to separate from the right spline driving gear (61), the right spline driven gear (62) can abut against the friction plates, so that the right inner friction plates (72) and the right outer friction plates (73) are combined.

8. A steering control mechanism according to claim 7, characterized in that: The box body comprises a right box body (14), a right box cover (15) and a right end cover (16) which are fixedly connected. One end of the transmission shaft (2) is rotatably matched with the right end cover (16). The right piston (8), the right box cover (15) and the right end cover (16) enclose a right oil chamber (81) for driving the right piston (8).

9. A steering control mechanism according to claim 8, characterized in that: The right brake clutch (7) is located between the right case cover (15) and the intermediate gear (27), and the right tooth clutch (6) is located inside the right case cover (15). The right end cover (16) is provided with a right oil inlet passage (82) communicating with the right oil chamber (81), and the right case cover (15) is provided with a right oil outlet passage (83) communicating with the right oil chamber (81).

10. A tracked vehicle, characterized in that: A steering control mechanism comprising any one of claims 1-9.

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